core_id
stringlengths 4
9
| doi
stringlengths 10
80
| original_abstract
stringlengths 500
21.8k
| original_title
stringlengths 20
441
| processed_title
stringlengths 20
441
| processed_abstract
stringlengths 34
13.6k
| cat
stringclasses 3
values | labelled_duplicates
sequence |
|---|---|---|---|---|---|---|---|
73371198 | 10.1007/JHEP12(2016)140 | It has recently been demonstrated that the dynamics of black holes at large
$D$ can be recast as a set of non gravitational membrane equations. These
membrane equations admit a simple static solution with shape $S^{D-p-2} \times
R^{p,1}$. In this note we study the equations for small fluctuations about this
solution in a limit in which amplitude and length scale of the fluctuations are
simultaneously scaled to zero as $D$ is taken to infinity. We demonstrate that
the resultant nonlinear equations, which capture the Gregory- Laflamme
instability and its end point, exactly agree with the effective dynamical
`black brane' equations of Emparan Suzuki and Tanabe. Our results thus identify
the `black brane' equations as a special limit of the membrane equations and so
unify these approaches to large $D$ black hole dynamics.Comment: 10 pages, references adde | Unstable `black branes' from scaled membranes at large $D$ | unstable `black branes' from scaled membranes at large $d$ | holes recast gravitational equations. admit simultaneously scaled infinity. resultant capture gregory laflamme instability agree brane emparan suzuki tanabe. brane unify pages adde | non_dup | [] |
73404475 | 10.1007/JHEP12(2016)141 | Phenomenologically appealing supersymmetric grand unified theories have large
gauge representations and thus are not asymptotically free. Their ultraviolet
validity is limited by the appearance of a Landau pole well before the Planck
scale. One could hope that these theories save themselves, before the inclusion
of gravity, by generating an interacting ultraviolet fixed point, similar to
the one recently discovered in non-supersymmetric gauge-Yukawa theories.
Employing a-maximization, a-theorem, unitarity bounds, as well as positivity of
other central charges we nonperturbatively rule out this possibility for a
broad class of prime candidates of phenomenologically relevant supersymmetric
grand unified theories. We also uncover candidates passing these tests, which
have either exotic matter or contain one field decoupled from the
superpotential. The latter class of theories contains a model with the minimal
matter content required by phenomenology.Comment: 1 figure, section on the doublet-triplet problem added, new
references, accepted in JHE | Asymptotically Safe Grand Unification | asymptotically safe grand unification | phenomenologically appealing supersymmetric grand unified representations asymptotically free. ultraviolet validity appearance landau pole planck scale. hope save inclusion generating interacting ultraviolet discovered supersymmetric yukawa theories. employing maximization unitarity bounds positivity charges nonperturbatively broad prime candidates phenomenologically supersymmetric grand unified theories. uncover candidates passing exotic decoupled superpotential. doublet triplet | non_dup | [] |
73353707 | 10.1007/JHEP12(2016)142 | Gauge-invariant operators can be specified by equivalence classes of
permutations. We develop this idea concretely for the singlets of the flavour
group $SO(N_f)$ in $U(N_c)$ gauge theory by using Gelfand pairs and Schur-Weyl
duality. The singlet operators, when specialised at $N_f =6$, belong to the
scalar sector of ${\cal N}=4$ SYM. A simple formula is given for the two-point
functions in the free field limit of $g_{YM}^2 =0$. The free two-point
functions are shown to be equal to the partition function on a 2-complex with
boundaries and a defect, in a topological field theory of permutations. The
permutation equivalence classes are Fourier transformed to a representation
basis which is orthogonal for the two-point functions at finite $N_c , N_f$.
Counting formulae for the gauge-invariant operators are described. The one-loop
mixing matrix is derived as a linear operator on the permutation equivalence
classes.Comment: 50 pages, v2: typos corrected, v3: to appear in JHE | Flavour singlets in gauge theory as Permutations | flavour singlets in gauge theory as permutations | specified equivalence permutations. concretely singlets flavour gelfand schur weyl duality. singlet specialised belong sym. partition boundaries defect topological permutations. permutation equivalence fourier transformed orthogonal counting formulae described. permutation equivalence pages typos corrected | non_dup | [] |
73356832 | 10.1007/JHEP12(2016)145 | One way to diagnose chaos in bipartite unitary channels is via the tripartite
information of the corresponding Choi state, which for certain choices of the
subsystems reduces to the negative conditional mutual information (CMI). We
study this quantity from a quantum information-theoretic perspective to clarify
its role in diagnosing scrambling. When the CMI is zero, we find that the
channel has a special normal form consisting of local channels between
individual inputs and outputs. However, we find that arbitrarily low CMI does
not imply arbitrary proximity to a channel of this form, although it does imply
a type of approximate recoverability of one of the inputs. When the CMI is
maximal, we find that the residual channel from an individual input to an
individual output is completely depolarizing when the other input is maximally
mixed. However, we again find that this result is not robust. We also extend
some of these results to the multipartite case and to the case of Haar-random
pure input states. Finally, we look at the relationship between tripartite
information and its Renyi-2 version which is directly related to
out-of-time-order correlation functions. In particular, we demonstrate an
arbitrarily large gap between the two quantities.Comment: 32 pages, 3 figure | Conditional Mutual Information of Bipartite Unitaries and Scrambling | conditional mutual information of bipartite unitaries and scrambling | diagnose chaos bipartite unitary tripartite choi choices subsystems reduces conditional mutual quantity theoretic perspective clarify diagnosing scrambling. consisting inputs outputs. arbitrarily imply proximity imply approximate recoverability inputs. maximal residual depolarizing maximally mixed. robust. extend multipartite haar states. look tripartite renyi functions. arbitrarily pages | non_dup | [] |
42679637 | 10.1007/JHEP12(2016)146 | We analyse generic AdS flux backgrounds preserving eight supercharges in
$D=4$ and $D=5$ dimensions using exceptional generalised geometry. We show that
they are described by a pair of globally defined, generalised structures,
identical to those that appear for flat flux backgrounds but with different
integrability conditions. We give a number of explicit examples of such
"exceptional Sasaki-Einstein" backgrounds in type IIB supergravity and
M-theory. In particular, we give the complete analysis of the generic AdS$_5$
M-theory backgrounds. We also briefly discuss the structure of the moduli space
of solutions. In all cases, one structure defines a "generalised Reeb vector"
that generates a Killing symmetry of the background corresponding to the
R-symmetry of the dual field theory, and in addition encodes the generic
contact structures that appear in the $D=4$ M-theory and $D=5$ type IIB cases.
Finally, we investigate the relation between generalised structures and
quantities in the dual field theory, showing that the central charge and
R-charge of BPS wrapped-brane states are both encoded by the generalised Reeb
vector, as well as discussing how volume minimisation (the dual of $a$- and
$\mathcal{F}$-maximisation) is encoded.Comment: 40 page | The exceptional generalised geometry of supersymmetric AdS flux
backgrounds | the exceptional generalised geometry of supersymmetric ads flux backgrounds | analyse generic backgrounds preserving eight supercharges exceptional generalised geometry. globally generalised backgrounds integrability conditions. exceptional sasaki einstein backgrounds supergravity theory. generic backgrounds. briefly moduli solutions. defines generalised reeb generates killing encodes generic cases. generalised quantities wrapped brane encoded generalised reeb discussing minimisation mathcal maximisation | non_dup | [] |
73377759 | 10.1007/JHEP12(2016)147 | Assuming the existence of a field theory in D dimensions dual to
(D+1)-dimensional flat space, governed by the asymptotic symmetries of flat
space, we make some preliminary remarks about the properties of this field
theory. We review briefly some successes of the 3d bulk - 2d boundary case and
then focus on the 4d bulk - 3d boundary example, where the symmetry in question
is the infinite dimensional BMS4 algebra. We look at the constraints imposed by
this symmetry on a 3d field theory by constructing highest weight
representations of this algebra. We construct two and three point functions of
BMS primary fields and surprisingly find that symmetries constrain these
correlators to be identical to those of a 2d relativistic conformal field
theory. We then go one dimension higher and construct prototypical examples of
4d field theories which are putative duals of 5d Minkowski spacetimes. These
field theories are ultra-relativistic limits of electrodynamics and Yang-Mills
theories which exhibit invariance under the conformal Carroll group in D=4. We
explore the different sectors within these Carrollian gauge theories and
investigate the symmetries of the equations of motion to find that an infinite
ultra-relativistic conformal structure arises in each case.Comment: 45 page | Flat Holography: Aspects of the dual field theory | flat holography: aspects of the dual field theory | governed asymptotic symmetries preliminary remarks theory. briefly successes infinite algebra. look imposed constructing representations algebra. surprisingly symmetries constrain correlators relativistic conformal theory. prototypical putative duals minkowski spacetimes. ultra relativistic electrodynamics mills exhibit invariance conformal carroll explore sectors carrollian symmetries infinite ultra relativistic conformal arises | non_dup | [] |
42753697 | 10.1007/JHEP12(2016)148 | We study the instanton partition functions of 5d maximal super Yang-Mills
theories with all classical gauge groups. They are computed from the ADHM
quantum mechanics of the D0-D4-O4 systems. Our partition functions respect
S-dualities of the circle compactified Yang-Mills theories and various
orientifold backgrounds. We also compute and study the $S^5$ partition
functions that correspond to the 6d (2,0) superconformal indices. Our SO(2N)
index takes the form of the vacuum character of $\mathcal{W}_D$ algebra in a
special limit, supporting the $\mathcal{W}$ algebra conjecture. We propose new
indices for (2,0) theories with outer automorphism twists along the temporal
circle, obtained from non-simply-laced SYMs on $S^5$.Comment: 26 pages, no figure; v2: reference added, minor change | M5-branes, orientifolds, and S-duality | m5-branes, orientifolds, and s-duality | instanton partition maximal super mills groups. adhm mechanics systems. partition dualities circle compactified mills orientifold backgrounds. partition superconformal indices. character mathcal supporting mathcal conjecture. propose indices outer automorphism twists circle laced syms .comment pages minor | non_dup | [] |
73392580 | 10.1007/JHEP12(2016)149 | We investigate multi-lepton signals produced by ElectroWeakino (EWino) decays
in the MSSM and the TMSSM scenarios with sfermions, gluinos and non Standard
Model Higgses at the TeV scale, being the Bino electroweak-scale dark matter.
We recast the present LHC constraints on EWinos for these models and we find
that wide MSSM and TMSSM parameter regions prove to be allowed. We forecast the
number of events expected in the signal regions of the experimental
multi-lepton analyses in the next LHC runs. The correlations among these
numbers will help to determine whether future deviations in multi-lepton data
are ascribable to the EWinos, as well as the supersymmetric model they
originate from.Comment: 33 pages, 10 figures, 3 table | Confronting SUSY models with LHC data via electroweakino production | confronting susy models with lhc data via electroweakino production | lepton electroweakino ewino decays mssm tmssm scenarios sfermions gluinos higgses bino electroweak matter. recast ewinos mssm tmssm allowed. forecast lepton runs. deviations lepton ascribable ewinos supersymmetric originate pages | non_dup | [] |
42742141 | 10.1007/JHEP12(2016)150 | The extension of the Standard Model by heavy right-handed neutrinos can
simultaneously explain the observed neutrino masses via the seesaw mechanism
and the baryon asymmetry of the Universe via leptogenesis. If the mass of the
heavy neutrinos is below the electroweak scale, they may be found at LHCb,
BELLE II, the proposed SHiP experiment or a future high-energy collider. In
this mass range, the baryon asymmetry is generated via $CP$-violating
oscillations of the heavy neutrinos during their production. We study the
generation of the baryon asymmetry of the Universe in this scenario from first
principles of non-equilibrium quantum field theory, including spectator
processes and feedback effects. We eliminate several uncertainties from
previous calculations and find that the baryon asymmetry of the Universe can be
explained with larger heavy neutrino mixing angles, increasing the chance for
an experimental discovery. For the limiting cases of fast and strongly
overdamped oscillations of right-handed neutrinos, the generation of the baryon
asymmetry can be calculated analytically up to corrections of order one.Comment: 49 page | Leptogenesis from Oscillations of Heavy Neutrinos with Large Mixing
Angles | leptogenesis from oscillations of heavy neutrinos with large mixing angles | handed neutrinos simultaneously seesaw baryon asymmetry universe leptogenesis. neutrinos electroweak lhcb belle ship collider. baryon asymmetry violating oscillations neutrinos production. baryon asymmetry universe principles spectator effects. eliminate baryon asymmetry universe angles chance discovery. limiting overdamped oscillations handed neutrinos baryon asymmetry analytically | non_dup | [] |
42751494 | 10.1007/JHEP12(2016)152 | In the Littlest Higgs model with $T$ parity (LHT), the $T$-odd heavy photon
($A_H$) is weakly interacting and can play the role of dark matter. We
investigate the lower limit on the mass of $A_H$ dark matter under the
constraints from Higgs data, EWPOs, $R_b$, Planck 2015 dark matter relic
abundance, PandaX-II/LUX 2016 direct detections and LHC-8 TeV monojet results.
We find that (1) Higgs data, EWPOs and $R_b$ can exclude the mass of $A_H$ up
to 99 GeV. To produce the correct dark matter relic abundance, $A_H$ has to
co-annihilate with $T$-odd quarks ($q_H$) or leptons ($\ell_H$); (2) the LUX
(PandaX-II) 2016 data can further exclude $m_{A_H}<380 (270)$ GeV for
$\ell_H$-$A_H$ co-annihilation and $m_{A_H}<350 (240)$ GeV for $q_H-A_H$
co-annihilation; (3) LHC-8 TeV monojet result can give a strong lower limit,
$m_{A_H}>540$ GeV, for $q_H$-$A_H$ co-annihilation; (4) future XENON1T (2017)
experiment can fully cover the parameter space of $\ell_H$-$A_H$
co-annihilation and will push the lower limit of $m_{A_H}$ up to about 640 GeV
for $q_H$-$A_H$ co-annihilation.Comment: discussions added, version accepted by JHE | Little Higgs Dark Matter after PandaX-II/LUX 2016 and LHC Run-1 | little higgs dark matter after pandax-ii/lux 2016 and lhc run-1 | littlest parity weakly interacting matter. ewpos planck relic abundance pandax detections monojet results. ewpos exclude gev. relic abundance annihilate quarks leptons pandax exclude annihilation annihilation monojet annihilation xenon cover annihilation push discussions | non_dup | [] |
73396011 | 10.1007/JHEP12(2016)154 | We consider the leading and subleading UV divergences for the four-point
on-shell scattering amplitudes in D=6,8,10 supersymmetric Yang-Mills theories
in the planar limit. These theories belong to the class of maximally
supersymmetric gauge theories and presumably possess distinguished properties
beyond perturbation theory. In the previous works, we obtained the recursive
relations that allow one to get the leading and subleading divergences in all
loops in a pure algebraic way. The all loop summation of the leading
divergences is performed with the help of the differential equations which are
the generalization of the RG equations for non-renormalizable theories. Here we
mainly focus on solving and analyzing these equations. We discuss the
properties of the obtained solutions and interpretation of the results.Comment: PdfLatex, 18 pages, 9 Figure | Summation of all-loop UV Divergences in Maximally Supersymmetric Gauge
Theories | summation of all-loop uv divergences in maximally supersymmetric gauge theories | subleading divergences amplitudes supersymmetric mills planar limit. belong maximally supersymmetric presumably possess distinguished perturbation theory. recursive subleading divergences loops algebraic way. summation divergences generalization renormalizable theories. solving analyzing equations. pdflatex pages | non_dup | [] |
73362497 | 10.1007/JHEP12(2016)155 | We argue that moduli stabilization generically restricts the evolution
following transitions between weakly coupled de Sitter vacua and can induce a
strong selection bias towards inflationary cosmologies. The energy density of
domain walls between vacua typically destabilizes Kahler moduli and triggers a
runaway towards large volume. This decompactification phase can collapse the
new de Sitter region unless a minimum amount of inflation occurs after the
transition. A stable vacuum transition is guaranteed only if the inflationary
expansion generates overlapping past light cones for all observable modes
originating from the reheating surface, which leads to an approximately flat
and isotropic universe. High scale inflation is vastly favored. Our results
point towards a framework for studying parameter fine-tuning and inflationary
initial conditions in flux compactifications.Comment: 56 pages, 17 figures; v2: fixed typo | Inflation Expels Runaways | inflation expels runaways | argue moduli stabilization generically restricts weakly sitter vacua induce inflationary cosmologies. walls vacua destabilizes kahler moduli triggers runaway volume. decompactification collapse sitter unless inflation transition. guaranteed inflationary generates overlapping cones observable originating reheating isotropic universe. inflation vastly favored. studying fine tuning inflationary pages typo | non_dup | [] |
42735374 | 10.1007/JHEP12(2016)156 | We study perturbations of 4-dimensional fuzzy spheres as backgrounds in the
IKKT or IIB matrix model. Gauge fields and metric fluctuations are identified
among the excitation modes with lowest spin, supplemented by a tower of
higher-spin fields. They arise from an internal structure which can be viewed
as a twisted bundle over $S^4$, leading to a covariant noncommutative geometry.
The linearized 4-dimensional Einstein equations are obtained from the classical
matrix model action under certain conditions, modified by an IR cutoff. Some
one-loop contributions to the effective action are computed using the formalism
of string states.Comment: 38+8 pages, 1 figure. V2: substantial revision: extension to thick
spheres and rank 3 tensor, modified conclusion. V3: more transparent analysis
of gravity modes, typos fixe | Emergent gravity on covariant quantum spaces in the IKKT model | emergent gravity on covariant quantum spaces in the ikkt model | perturbations fuzzy spheres backgrounds ikkt model. supplemented tower fields. arise viewed twisted bundle covariant noncommutative geometry. linearized einstein cutoff. formalism pages figure. substantial revision thick spheres conclusion. transparent typos fixe | non_dup | [] |
42742646 | 10.1007/JHEP12(2016)157 | Extending the formulation for open superstring field theory given in
arXiv:1508.00366, we attempt to construct a complete action for heterotic
string field theory. The action is non-polynomial in the Ramond string field
Psi, and we construct it order by order in Psi. Using a dual formulation in
which the role of eta and Q is exchanged, the action is explicitly obtained at
the quadratic and quartic order in Psi with the gauge transformations.Comment: 44pages; ver2: Modification for one of the author's address; ver3:
appendix B is added (50 pages in total); ver4: typos are correcte | Construction of action for heterotic string field theory including the
Ramond sector | construction of action for heterotic string field theory including the ramond sector | extending formulation superstring attempt heterotic theory. ramond psi. formulation exchanged explicitly quadratic quartic pages modification pages typos correcte | non_dup | [] |
73361109 | 10.1007/JHEP12(2016)158 | We study the thermal transition of QCD with two degenerate light flavours by
lattice simulations using $O(a)$-improved Wilson quarks. Temperature scans are
performed at a fixed value of $N_t = (aT)^{-1}=16$, where $a$ is the lattice
spacing and $T$ the temperature, at three fixed zero-temperature pion masses
between 200 MeV and 540 MeV. In this range we find that the transition is
consistent with a broad crossover. As a probe of the restoration of chiral
symmetry, we study the static screening spectrum. We observe a degeneracy
between the transverse isovector vector and axial-vector channels starting from
the transition temperature. Particularly striking is the strong reduction of
the splitting between isovector scalar and pseudoscalar screening masses around
the chiral phase transition by at least a factor of three compared to its value
at zero temperature. In fact, the splitting is consistent with zero within our
uncertainties. This disfavours a chiral phase transition in the $O(4)$
universality class.Comment: 46 pages, 16 figure, 12 tables; v2: typos corrected; enhanced
explanations and discussions; included study of systematic effects for the
extraction of screening masses; conclusions unchanged; new version to match
published versio | On the strength of the $U_A(1)$ anomaly at the chiral phase transition
in $N_f=2$ QCD | on the strength of the $u_a(1)$ anomaly at the chiral phase transition in $n_f=2$ qcd | degenerate flavours wilson quarks. scans spacing pion mev. broad crossover. restoration chiral screening spectrum. degeneracy isovector axial temperature. striking splitting isovector pseudoscalar screening chiral temperature. splitting uncertainties. disfavours chiral universality pages tables typos corrected explanations discussions extraction screening unchanged match versio | non_dup | [] |
83858857 | 10.1007/JHEP12(2017)002 | The Abelian Higgs model forms an essential part of the electroweak standard
model: it is the sector containing only Z and Higgs bosons. We present a
diagram-based proof of the tree-level unitarity of this model inside the
unitary gauge, where only physical degrees of freedom occur. We derive
combinatorial recursion relations for off-shell amplitudes in the massless
approximation, which allows us to prove the cancellation of the first two
orders in energy of unitarity-violating high-energy behaviour for any
tree-level amplitude in this model. We describe a deformation of the amplitudes
by extending the physical phase space to at least 7 spacetime dimensions, which
leads to on-shell recursion relations a la BCFW. These lead to a simple proof
that all on-shell tree amplitudes obey partial-wave unitarity.Comment: 15 page | Amplitudes, recursion relations and unitarity in the Abelian Higgs Model | amplitudes, recursion relations and unitarity in the abelian higgs model | abelian electroweak bosons. unitarity unitary freedom occur. derive combinatorial recursion amplitudes massless cancellation orders unitarity violating model. deformation amplitudes extending spacetime recursion bcfw. amplitudes obey | non_dup | [] |
93956844 | 10.1007/JHEP12(2017)003 | We present tree-level $n$-particle on-shell scattering amplitudes of various
brane theories with $16$ conserved supercharges. These include the world-volume
theory of a probe D3-brane or D5-brane in 10D Minkowski spacetime as well as a
probe M5-brane in 11D Minkowski spacetime, which describes self interactions of
an abelian tensor supermultiplet with 6D $(2,0)$ supersymmetry.
Twistor-string-like formulas are proposed for tree-level scattering amplitudes
of all multiplicities for each of these theories. The R symmetry of the
D3-brane theory is shown to be $SU(4) \times U(1)$, and the $U(1)$ factor
implies that its amplitudes are helicity conserving. Each of 6D theories
(D5-brane and M5-brane) reduces to the D3-brane theory by dimensional
reduction. As special cases of the general M5-brane amplitudes, we present
compact formulas for examples involving only the self-dual $B$ field with
$n=4,6,8$.Comment: 58 pages, 2 figures. v2: minor corrections, references added; v3:
references added, matches published JHEP versio | M5-Brane and D-Brane Scattering Amplitudes | m5-brane and d-brane scattering amplitudes | amplitudes brane conserved supercharges. brane brane minkowski spacetime brane minkowski spacetime describes abelian supermultiplet supersymmetry. twistor formulas amplitudes multiplicities theories. brane amplitudes helicity conserving. brane brane reduces brane reduction. brane amplitudes formulas involving .comment pages figures. minor matches jhep versio | non_dup | [] |
93956426 | 10.1007/JHEP12(2017)004 | The double copy is a much-studied relationship between scattering amplitudes
in gauge and gravity theories, that has subsequently been extended to classical
field solutions. In nearly all previous examples, the graviton field is defined
around Minkowski space. Recently, it has been suggested that one may set up a
double copy for gravitons defined around a non-trivial background. We
investigate this idea from the point of view of the classical double copy.
First, we use Kerr-Schild spacetimes to construct graviton solutions in curved
space, as double copies of gauge fields on non-zero gauge backgrounds. Next, we
find that we can reinterpret such cases in terms of a graviton on a
non-Minkowski background, whose single copy is a gauge field in the same
background spacetime. The latter type of double copy persists even when the
background is not of Kerr-Schild form, and we provide examples involving
conformally flat metrics. Our results will be useful in extending the remit of
the double copy, including to possible cosmological applications.Comment: 25 pages, 2 figure | The Kerr-Schild double copy in curved spacetime | the kerr-schild double copy in curved spacetime | copy amplitudes subsequently solutions. nearly graviton minkowski space. copy gravitons trivial background. copy. kerr schild spacetimes graviton curved copies backgrounds. reinterpret graviton minkowski copy spacetime. copy persists kerr schild involving conformally metrics. extending remit copy cosmological pages | non_dup | [] |
93954162 | 10.1007/JHEP12(2017)005 | There exist two variants of the old minimal formulation for ${\cal N}=1$
supergravity in four dimensions, in which one or each of the two auxiliary
scalars is replaced by the field strength of a gauge three-form. These theories
are known as three-form supergravity and complex three-form supergravity,
respectively. For each of them, we present a super-Weyl invariant coupling of
supergravity to the supermembrane and prove kappa-invariance of the resulting
action. In the case of three-form supergravity, we demonstrate that the action
constructed reduces to that given by Ovrut and Waldram twenty years ago upon
imposing a super-Weyl gauge in which the compensating three-form superfield is
set to a constant.Comment: 22 page | Complex three-form supergravity and membranes | complex three-form supergravity and membranes | variants formulation supergravity auxiliary scalars replaced form. supergravity supergravity respectively. super weyl supergravity supermembrane kappa invariance action. supergravity reduces ovrut waldram twenty imposing super weyl compensating superfield | non_dup | [] |
93958852 | 10.1007/JHEP12(2017)007 | By studying an explicit analytical solution of the Coulomb problem on the
lattice we demonstrate a breakdown of perturbative matching for the description
of the Coulomb artifacts in lattice NRQCD, which leads to a large systematic
error in the predictions for the heavy quarkonium spectrum. The breakdown is a
result of a fine interplay between the short and long distance effects specific
to the lattice regularization of NRQCD. We show how the problem can be solved
within the Schrodinger matching procedure.Comment: 11 pages, 1 figure. Journal version (minor revisions implemented | Coulomb Artifacts and Breakdown of Perturbative Matching in Lattice
NRQCD | coulomb artifacts and breakdown of perturbative matching in lattice nrqcd | studying coulomb breakdown perturbative matching coulomb artifacts nrqcd quarkonium spectrum. breakdown fine interplay regularization nrqcd. solved schrodinger matching pages figure. minor revisions implemented | non_dup | [] |
73989025 | 10.1007/JHEP12(2017)008 | We present results for the decay constants of the $D$ and $D_s$ mesons
computed in lattice QCD with $N_f=2+1$ dynamical flavours. The simulations are
based on RBC/UKQCD's domain wall ensembles with both physical and unphysical
light-quark masses and lattice spacings in the range 0.11--0.07$\,$fm. We
employ the domain wall discretisation for all valence quarks.
The results in the continuum limit are
$f_D=208.7(2.8)_\mathrm{stat}\left(^{+2.1}_{-1.8}\right)_\mathrm{sys}\,\mathrm{MeV}$
and
$f_{D_{s}}=246.4(1.3)_\mathrm{stat}\left(^{+1.3}_{-1.9}\right)_\mathrm{sys}\,\mathrm{MeV}$
and
$f_{D_s}/f_D=1.1667(77)_\mathrm{stat}\left(^{+57}_{-43}\right)_\mathrm{sys}$.
Using these results in a Standard Model analysis we compute the predictions
$|V_{cd}|=0.2185(50)_\mathrm{exp}\left(^{+35}_{-37}\right)_\mathrm{lat}$ and
$|V_{cs}|=1.011(16)_\mathrm{exp}\left(^{+4}_{-9}\right)_\mathrm{lat}$ for the
CKM matrix elements | The decay constants ${\mathbf{f_D}}$ and ${\mathbf{f_{D_{s}}}}$ in the
continuum limit of ${\mathbf{N_f=2+1}}$ domain wall lattice QCD | the decay constants ${\mathbf{f_d}}$ and ${\mathbf{f_{d_{s}}}}$ in the continuum limit of ${\mathbf{n_f=2+1}}$ domain wall lattice qcd | mesons flavours. ukqcd ensembles unphysical spacings employ discretisation valence quarks. continuum mathrm stat mathrm mathrm mathrm stat mathrm mathrm mathrm stat mathrm mathrm mathrm mathrm mathrm | non_dup | [] |
83871218 | 10.1007/JHEP12(2017)011 | Supergravity with eight supercharges in a four-dimensional Euclidean space is
constructed at the full non-linear level by performing an off-shell time-like
reduction of five-dimensional supergravity. The resulting four-dimensional
theory is realized off-shell with the Weyl, vector and tensor supermultiplets
and a corresponding multiplet calculus. Hypermultiplets are included as well,
but they are themselves only realized with on-shell supersymmetry. The
off-shell reduction leads to a full understanding of the Euclidean theory. A
complete multiplet calculus is presented along the lines of the Minkowskian
theory. Unlike in Minkowski space, chiral and anti-chiral multiplets are real
and supersymmetric actions are generally unbounded from below. Precisely as in
the Minkowski case, where one has different formulations of Poincar\'e
supergravity by introducing different compensating supermultiplets, one can
also obtain different versions of Euclidean supergravity.Comment: 42 page | Euclidean Supergravity | euclidean supergravity | supergravity eight supercharges euclidean performing supergravity. realized weyl supermultiplets multiplet calculus. hypermultiplets realized supersymmetry. euclidean theory. multiplet calculus minkowskian theory. unlike minkowski chiral chiral multiplets supersymmetric unbounded below. precisely minkowski formulations poincar supergravity introducing compensating supermultiplets versions euclidean | non_dup | [] |
84091639 | 10.1007/JHEP12(2017)012 | In collinear factorization, light-cone distribution amplitudes (LCDAs) are
key ingredients to calculate the production rate of a hadron in high energy
exclusive processes. For a doubly-heavy meson system (such as $B_c, J/\psi,
\Upsilon$ etc), the LCDAs contain perturbative scales that can be integrated
out and then are re-factorized into products of perturbatively calculable
distribution parts and non-relativistic QCD matrix elements. In this
re-factorization scheme, the LCDAs are known at next-to-leading order in the
strong coupling constant $\alpha_s$ and at leading order in the velocity
expansion. In this work, we calculate the ${\cal O}( { v}^2)$ corrections to
twist-2 LCDAs of S-wave $B_c$ mesons. These results are applicable to heavy
quarkonia like $\eta_{c,b}$, $J/\psi$ and $\Upsilon$ by setting $m_b=m_c$. We
apply these relativistically corrected LCDAs to study their inverse moments and
a few Gegenbauer moments which are important for phenomenological study. We
point out that the relativistic corrections are sizable, and comparable with
the next-to-leading order radiative corrections. These results for LCDAs are
useful in future theoretical analyses of the productions of heavy quarkonia and
$B_c$ mesons.Comment: 18 pages, 1 figure, 2 table | Relativistic corrections to light-cone distribution amplitudes of S-wave
$B_c$ mesons and heavy quarkonia | relativistic corrections to light-cone distribution amplitudes of s-wave $b_c$ mesons and heavy quarkonia | collinear factorization cone amplitudes lcdas ingredients hadron exclusive processes. doubly meson upsilon lcdas perturbative factorized perturbatively calculable relativistic elements. factorization lcdas alpha expansion. twist lcdas mesons. applicable quarkonia upsilon relativistically corrected lcdas moments gegenbauer moments phenomenological study. relativistic sizable comparable radiative corrections. lcdas productions quarkonia pages | non_dup | [] |
83857451 | 10.1007/JHEP12(2017)013 | We analytically solve the conformal bootstrap equations in the Regge limit
for large N conformal field theories. For theories with a parametrically large
gap, the amplitude is dominated by spin-2 exchanges and we show how the
crossing equations naturally lead to the construction of AdS exchange Witten
diagrams. We also show how this is encoded in the anomalous dimensions of
double-trace operators of large spin and large twist. We use the chaos bound to
prove that the anomalous dimensions are negative. Extending these results to
correlators containing two scalars and two conserved currents, we show how to
reproduce the CEMZ constraint that the three-point function between two
currents and one stress tensor only contains the structure given by
Einstein-Maxwell theory in AdS, up to small corrections. Finally, we consider
the case where operators of unbounded spin contribute to the Regge amplitude,
whose net effect is captured by summing the leading Regge trajectory. We
compute the resulting anomalous dimensions and corrections to OPE coefficients
in the crossed channel and use the chaos bound to show that both are negative.Comment: 40 pages, 1 figure; V2: Small corrections and clarification | Conformal Bootstrap in the Regge Limit | conformal bootstrap in the regge limit | analytically solve conformal bootstrap regge conformal theories. parametrically dominated exchanges crossing naturally witten diagrams. encoded anomalous trace twist. chaos anomalous negative. extending correlators scalars conserved currents reproduce cemz currents einstein maxwell corrections. unbounded regge captured summing regge trajectory. anomalous crossed chaos pages clarification | non_dup | [] |
93941923 | 10.1007/JHEP12(2017)014 | We adapt the Bender-Wu algorithm to solve perturbatively but very efficiently
the eigenvalue problem of "relativistic" quantum mechanical problems whose
Hamiltonians are difference operators of the exponential-polynomial type. We
implement the algorithm in the function BWDifference in the updated Mathematica
package BenderWu. With the help of BWDifference, we survey quantum mirror
curves of toric fano Calabi-Yau threefolds, and find strong evidence that not
only are the perturbative eigenenergies of the associated 1d quantum mechanical
problems Borel summable, but also that the Borel sums are exact.Comment: 39 pages, 4 figures, and 4 tables. Bundled with the source files of
this document are the Mathematica notebooks for the package BenderWu,
including the new function BWDifferenc | High order perturbation theory for difference equations and Borel
summability of quantum mirror curves | high order perturbation theory for difference equations and borel summability of quantum mirror curves | adapt bender solve perturbatively efficiently eigenvalue relativistic hamiltonians exponential type. implement bwdifference updated mathematica package benderwu. bwdifference mirror toric fano calabi threefolds perturbative eigenenergies borel summable borel sums pages tables. bundled files document mathematica notebooks package benderwu bwdifferenc | non_dup | [] |
93943023 | 10.1007/JHEP12(2017)015 | Reflection states are introduced in the vertical and horizontal modules of
the Ding-Iohara-Miki (DIM) algebra (quantum toroidal $\mathfrak{gl}_1$). Webs
of DIM representations are in correspondence with $(p,q)$-web diagrams of type
IIB string theory, under the identification of the algebraic intertwiner of
Awata, Feigin and Shiraishi with the refined topological vertex. Extending the
correspondence to the vertical reflection states, it is possible to engineer
the $\mathcal{N}=1$ quiver gauge theory of D-type (with unitary gauge groups).
In this way, the Nekrasov instanton partition function is reproduced from the
evaluation of expectation values of intertwiners. This computation leads to the
identification of the vertical reflection state with the orientifold plane of
string theory. We also provide a translation of this construction in the
Iqbal-Kozcaz-Vafa refined topological vertex formalism.Comment: 27 pages, 11 figures. Details of translation in terms of IKV refined
topological vertex added in the second versio | Reflection states in Ding-Iohara-Miki algebra and brane-web for D-type
quiver | reflection states in ding-iohara-miki algebra and brane-web for d-type quiver | reflection modules ding iohara miki toroidal mathfrak webs representations correspondence diagrams algebraic intertwiner awata feigin shiraishi refined topological vertex. extending correspondence reflection engineer mathcal quiver unitary nekrasov instanton partition reproduced expectation intertwiners. reflection orientifold theory. translation iqbal kozcaz vafa refined topological pages figures. translation refined topological versio | non_dup | [] |
93943355 | 10.1007/JHEP12(2017)016 | Using the N=4, 1D harmonic superspace approach, we construct a new type of
N=4 supersymmetric mechanics involving 4n-dimensional Quaternion-K\"ahler (QK)
1D sigma models as the bosonic core. The basic ingredients of our construction
are {\it local} N=4, 1D supersymmetry realized by the appropriate
transformations in 1D harmonic superspace, the general N=4, 1D superfield
vielbein and a set of 2(n+1) analytic "matter" superfields representing (n+1)
off-shell supermultiplets (4, 4, 0). Both superfield and component actions are
given for the simplest QK models with the manifolds \mathbb{H}H^n =
Sp(1,n)/[Sp(1) x Sp(n)] and \mathbb{H}P^n = Sp(1+n)/[Sp(1) x Sp(n)] as the
bosonic targets. For the general case the relevant superfield action and
constraints on the (4, 4, 0) "matter" superfields are presented. Further
generalizations are briefly discussed.Comment: further minor corrections in eqs. (2.21), (4.24) and (A9 | Quaternion-K\"ahler N=4 Supersymmetric Mechanics | quaternion-k\"ahler n=4 supersymmetric mechanics | harmonic superspace supersymmetric mechanics involving quaternion ahler sigma bosonic core. ingredients supersymmetry realized transformations harmonic superspace superfield vielbein analytic superfields representing supermultiplets superfield simplest manifolds mathbb mathbb bosonic targets. superfield superfields presented. generalizations briefly minor eqs. | non_dup | [] |
93952047 | 10.1007/JHEP12(2017)018 | Motivated by an analysis of the sub-superalgebras of the five-dimensional
superconformal algebra $F(4)$, we search for the holographic duals to
co-dimension one superconformal defects in 5d CFTs which have $SO(4,2) \oplus
U(1)$ bosonic symmetry. In particular, we look for domain wall solutions to
six-dimensional $F(4)$ gauged supergravity coupled to a single vector
multiplet. It is found that supersymmetric domain wall solutions do not exist
unless there is a non-trivial profile for one of the vector multiplet scalars
which is charged under the gauged $SU(2)$ R-symmetry. This non-trivial profile
breaks the $SU(2)$ to $U(1)$, thus matching expectations from the superalgebra
analysis. A consistent set of BPS equations is then obtained and solved
numerically. While the numerical solutions are generically singular and thought
to be dual to boundary CFTs, it is found that for certain fine-tuned choices of
parameters regular Janus solutions may be obtained.Comment: 35 pages, pdf-latex, 9 figures. v2: minor corrections, reference
adde | Janus solutions in six-dimensional gauged supergravity | janus solutions in six-dimensional gauged supergravity | motivated superalgebras superconformal holographic duals superconformal defects cfts oplus bosonic symmetry. look gauged supergravity multiplet. supersymmetric unless trivial multiplet scalars gauged symmetry. trivial breaks matching expectations superalgebra analysis. solved numerically. generically singular thought cfts fine tuned choices janus pages latex figures. minor adde | non_dup | [] |
93941619 | 10.1007/JHEP12(2017)019 | In this research the weak decay of $B^+_c$ decays to the $K^+K^-\pi^+$ final
state, which is observed by LHCb collaboration for the first time, is
calculated in the quasi-two-body decays which takes into account the $B^0_s$,
$\chi_{c0}$ and $D^0$ resonances and weak annihilation nonresonant
contributions. In this process, the $B^+_c$ meson decays first into
$B^0_s\pi^+$, $\chi_{c0}\pi^+$ and $D^0\pi^+$ intermediate states, and then the
$B^0_s$, $\chi_{c0}$ and $D^0$ resonances decay into $K^+K^-$ components, which
undergo final state interaction. The mode of the $B^+_c\rightarrow
D^0(\rightarrow K^-\pi^+)K^+$ is also associated to the calculation, in this
mode the intermediate resonance $D^0$ decays to the $K^-\pi^+$ final mesons.
The resonances $B^0_s$, $\chi_{c0}$ and $D^0$ effects in the $B^+_c\rightarrow
B^0_s(\rightarrow K^+K^-)\pi^+$, $B^+_c\rightarrow \chi_{c0}(\rightarrow
K^+K^-)\pi^+$ and $B^+_c\rightarrow D^0(\rightarrow K^+K^-)\pi^+,
D^0(\rightarrow K^-\pi^+)K^+$ decays are described in terms of the
quasi-two-body modes. There is a weak annihilation nonresonant contribution in
which $B^+_c$ decays to the $K^+K^-\pi^+$ directly, so the point-like 3-body
matrix element $\langle K^+K^-\pi^+|u\bar{d}|0\rangle$ is also considered. The
decay mode of the $B^+_c\rightarrow \bar{K}^{*0}(892)K^+$ is contributed to the
annihilation contribution. The branching ratios of quasi-two-body decays expand
in the range from $1.98\times10^{-6}$ to $7.32\times10^{-6}$ | Study of $B^+_c$ decays to the $K^+K^-\pi^+$ final state by using
$B^0_s$, $\chi_{c0}$ and $D^0$ resonances and weak annihilation nonresonant
topologys | study of $b^+_c$ decays to the $k^+k^-\pi^+$ final state by using $b^0_s$, $\chi_{c0}$ and $d^0$ resonances and weak annihilation nonresonant topologys | decays lhcb quasi decays resonances annihilation nonresonant contributions. meson decays resonances undergo interaction. rightarrow rightarrow decays mesons. resonances rightarrow rightarrow rightarrow rightarrow rightarrow rightarrow rightarrow decays quasi modes. annihilation nonresonant decays langle rangle considered. rightarrow contributed annihilation contribution. branching quasi decays expand | non_dup | [] |
84094163 | 10.1007/JHEP12(2017)020 | We consider BPS-counting functions $\mathcal{Z}_{N,M}$ of $N$ parallel
M5-branes probing a transverse $\mathbb{Z}_M$ orbifold geometry. These brane
web configurations can be dualised into a class of toric non-compact Calabi-Yau
threefolds which have the structure of an elliptic fibration over (affine)
$A_{N-1}$. We make this symmetry of $\mathcal{Z}_{N,M}$ manifest in particular
regions of the parameter space of the setup: we argue that for specific choices
of the deformation parameters, the supercharges of the system acquire
particular holonomy charges which lead to infinitely many cancellations among
states contributing to the partition function. The resulting (simplified)
$\mathcal{Z}_{N,M}$ can be written as a sum over weights forming a single
irreducible representation of the Lie algebra $\mathfrak{a}_{N-1}$ (or its
affine counterpart). We show this behaviour explicitly for an extensive list of
examples for specific values of $(N,M)$ and generalise the arising pattern for
generic configurations. Finally, for a particular compact M5-brane setup we use
this form of the partition function to make the duality $N\leftrightarrow M$
manifest.Comment: 70 page | Five-Brane Webs and Highest Weight Representations | five-brane webs and highest weight representations | counting mathcal branes probing mathbb orbifold geometry. brane configurations dualised toric calabi threefolds elliptic fibration affine mathcal manifest setup argue choices deformation supercharges acquire holonomy charges infinitely cancellations contributing partition function. simplified mathcal weights forming irreducible mathfrak affine counterpart explicitly extensive generalise arising generic configurations. brane setup partition duality leftrightarrow | non_dup | [] |
83864384 | 10.1007/JHEP12(2017)021 | We present predictions for the prompt-neutrino flux arising from the decay of
charmed mesons and baryons produced by the interactions of high-energy cosmic
rays in the Earth's atmosphere, making use of a QCD approach on the basis of
the general-mass variable-flavor-number scheme for the description of charm
hadroproduction at NLO, complemented by a consistent set of fragmentation
functions. We compare the theoretical results to those already obtained by our
and other groups with different theoretical approaches. We provide comparisons
with the experimental results obtained by the IceCube Collaboration in two
different analyses and we discuss the implications for parton distribution
functions.Comment: 43 pages, 21 figures, updated version, to be published in JHE | Prompt neutrinos from atmospheric charm in the general-mass
variable-flavor-number scheme | prompt neutrinos from atmospheric charm in the general-mass variable-flavor-number scheme | prompt arising charmed mesons baryons cosmic rays earth atmosphere flavor charm hadroproduction complemented fragmentation functions. approaches. comparisons icecube parton pages updated | non_dup | [] |
83854307 | 10.1007/JHEP12(2017)022 | We consider a class of models of neutrino mixing with $S_4$ lepton flavour
symmetry combined with a generalised CP symmetry, which are broken to residual
$Z_2$ and $Z_2 \times H^\nu_{\rm CP}$ symmetries in the charged lepton and
neutrino sectors, respectively, $H^\nu_{\rm CP}$ being a remnant CP symmetry of
the neutrino Majorana mass term. In this set-up the neutrino mixing angles and
CP violation (CPV) phases of the neutrino mixing matrix depend on three real
parameters - two angles and a phase. We classify all phenomenologically viable
mixing patterns and derive predictions for the Dirac and Majorana CPV phases.
Further, we use the results obtained on the neutrino mixing angles and leptonic
CPV phases to derive predictions for the effective Majorana mass in
neutrinoless double beta decay.Comment: 56 pages, includes 16 figures and 8 tables; the discussion on the
possibility to discriminate experimentally between the different cases
extended and a new related figure added; the discussion of neutrinoless
double beta decay extended; references added; typos corrected; matches
version published in JHE | Neutrino Mixing and Leptonic CP Violation from $S_4$ Flavour and
Generalised CP Symmetries | neutrino mixing and leptonic cp violation from $s_4$ flavour and generalised cp symmetries | lepton flavour generalised broken residual symmetries lepton sectors remnant majorana term. angles violation angles phase. classify phenomenologically viable derive dirac majorana phases. angles leptonic derive majorana neutrinoless beta pages tables discriminate experimentally neutrinoless beta typos corrected matches | non_dup | [] |
86414320 | 10.1007/JHEP12(2017)023 | We study quasinormal modes of shear gravitational perturbations for
hyperscaling violating Lifshitz theories, with Lifshitz and hyperscaling
violating exponents $z$ and $\theta$. The lowest quasinormal mode frequency
yields a shear diffusion constant which is in agreement with that obtained in
previous work by other methods. In particular for theories with $z<
d_i+2-\theta$ where $d_i$ is the boundary spatial dimension, the shear
diffusion constant exhibits power-law scaling with temperature, while for
$z=d_i+2-\theta$, it exhibits logarithmic scaling. We then calculate certain
2-point functions of the dual energy-momentum tensor holographically for $z\leq
d_i+2-\theta$, identifying the diffusive poles with the quasinormal modes
above. This reveals universal behaviour $\eta/s=1/4\pi$ for the
viscosity-to-entropy-density ratio for all $z\leq d_i+2-\theta$.Comment: v2: Latex, 21pgs, more details of analysis, review of shear diffusion
from membrane paradigm, references added, matches version to be publishe | Hyperscaling violation, quasinormal modes and shear diffusion | hyperscaling violation, quasinormal modes and shear diffusion | quasinormal gravitational perturbations hyperscaling violating lifshitz lifshitz hyperscaling violating exponents theta quasinormal methods. theta exhibits theta exhibits logarithmic scaling. holographically theta identifying diffusive poles quasinormal above. reveals universal viscosity theta .comment latex paradigm matches publishe | non_dup | [] |
86420109 | 10.1007/JHEP12(2017)024 | A search for the decay of the Standard Model Higgs boson into a $b\bar{b}$
pair when produced in association with a $W$ or $Z$ boson is performed with the
ATLAS detector. The analysed data, corresponding to an integrated luminosity of
36.1 fb$^{-1}$, were collected in proton-proton collisions in Run 2 of the
Large Hadron Collider at a centre-of-mass energy of 13 TeV. Final states
containing zero, one and two charged leptons (electrons or muons) are
considered, targeting the decays $Z\to\nu\nu$, $W\to\ell\nu$ and
$Z\to\ell\ell$. For a Higgs boson mass of 125 GeV, an excess of events over the
expected background from other Standard Model processes is found with an
observed significance of 3.5 standard deviations, compared to an expectation of
3.0 standard deviations. This excess provides evidence for the Higgs boson
decay into $b$-quarks and for its production in association with a vector
boson. The combination of this result with that of the Run 1 analysis yields a
ratio of the measured signal events to the Standard Model expectation equal to
$0.90 \pm 0.18 \rm{(stat.)} ^{+0.21}_{-0.19} \rm{(syst.)}$. Assuming the
Standard Model production cross-section, the results are consistent with the
value of the Yukawa coupling to $b$-quarks in the Standard Model.Comment: 68 pages in total, author list starting page 52, 13 figures, 15
tables, submitted to JHEP, All figures including auxiliary figures are
available at
https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2016-29/. This
version matches submission to JHE | Evidence for the $H \to b\bar{b}$ decay with the ATLAS detector | evidence for the $h \to b\bar{b}$ decay with the atlas detector | boson boson atlas detector. analysed luminosity proton proton collisions hadron collider tev. leptons muons targeting decays boson excess deviations expectation deviations. excess boson quarks boson. expectation stat. syst. yukawa quarks pages tables submitted jhep auxiliary matches submission | non_dup | [] |
154257941 | 10.1007/JHEP12(2017)025 | Bose-Einstein correlations of same-sign charged pions, produced in proton-proton collisions at a 7 TeV centre-of-mass energy, are studied using a data sample collected by the LHCb experiment. The signature for Bose-Einstein correlations is observed in the form of an enhancement of pairs of like-sign charged pions with small four-momentum difference squared. The charged-particle multiplicity dependence of the Bose-Einstein correlation parameters describing the correlation strength and the size of the emitting source is investigated, determining both the correlation radius and the chaoticity parameter. The measured correlation radius is found to increase as a function of increasing charged-particle multiplicity, while the chaoticity parameter is seen to decrease | Bose-Einstein correlations of same-sign charged pions in the forward region in pp collisions at $\sqrt{s} = 7 TeV$ | bose-einstein correlations of same-sign charged pions in the forward region in pp collisions at $\sqrt{s} = 7 tev$ | bose einstein pions proton proton collisions lhcb experiment. signature bose einstein enhancement pions squared. multiplicity bose einstein describing emitting determining chaoticity parameter. multiplicity chaoticity | non_dup | [] |
154257991 | 10.1007/JHEP12(2017)026 | The production of $B^{\pm}$ mesons is studied in pp collisions at centre-of-mass energies of 7 and 13 TeV, using $B^{\pm} \to J/\psi K^{\pm}$ decays and data samples corresponding to 1.0 $fb^{−1}$ and 0.3 $fb^{−1}$, respectively. The production cross-sections summed over both charges and integrated over the transverse momentum range $0 < p_T < 40 GeV/c$ and the rapidity range $2.0 < y < 4.5$ are measured to be\ud
$\sigma (pp \to B^{\pm}X,\sqrt{s} = 7 TeV) = 43.0 \pm 0.2 \pm 2.5 \pm 1.7 \mu b$,\ud
$\sigma (pp \to B^{\pm}X,\sqrt{s} = 13 TeV) = 86.6 \pm 0.5 \pm 5.4 \pm 3.4 \mu b$,\ud
where the first uncertainties are statistical, the second are systematic, and the third are due to the limited knowledge of the $B^{\pm} \to J/\psi K^{\pm}$ branching fraction. The ratio of the cross-section at 13 TeV to that at 7 TeV is determined to be $2.02 \pm 0.02 (stat) \pm 0.12 (syst)$. Differential cross-sections are also reported as functions of $p_T$ and $y$. All results are in agreement with theoretical calculations based on the state-of-art fixed next-to-leading order quantum chromodynamics | Measurement of the $B^{\pm}$ production cross-section in $pp$ collisions at $\sqrt{s}$ = 7 and 13 TeV | measurement of the $b^{\pm}$ production cross-section in $pp$ collisions at $\sqrt{s}$ = 7 and 13 tev | mesons collisions decays respectively. summed charges rapidity sigma sqrt sigma sqrt branching fraction. stat syst chromodynamics | non_dup | [] |
93938981 | 10.1007/JHEP12(2017)027 | The rare $\tau^- \to \eta^{(\prime)} \pi^- \nu_\tau$ decays, which are
suppressed by $G$-parity in the Standard Model (SM), can be sensitive to the
effects of new interactions. We study the sensitivity of different observables
of these decays in the framework of an effective field theory that includes the
most general interactions between SM fields up to dimension six, assuming
massless neutrinos. Owing to the strong suppression of the SM isospin breaking
amplitudes, we find that the different observables would allow to set
constraints on scalar interactions that are stronger than those coming from
other low-energy observables.Comment: 23 pages, 8 multiple figures and one table. Extended discussion of
the hadronization of the tensor current and improved presentation of the
plots. Accepted for publication in JHE | Effective-field theory analysis of the $\tau^- \to \eta^{(\prime)} \pi^-
\nu_\tau$ decays | effective-field theory analysis of the $\tau^- \to \eta^{(\prime)} \pi^- \nu_\tau$ decays | rare prime decays suppressed parity interactions. observables decays massless neutrinos. owing suppression isospin breaking amplitudes observables stronger coming pages table. hadronization presentation plots. publication | non_dup | [] |
83853246 | 10.1007/JHEP12(2017)028 | We classify $su(N_c)$ gauge theories on $\mathbb R^3\times \mathbb S^1$ with
massless fermions in higher representations obeying periodic boundary
conditions along $\mathbb S^1$. In particular, we single out the class of
theories that is asymptotically free and weakly coupled in the infrared, and
therefore, is amenable to semi-classical treatment. Our study is conducted by
carefully identifying the vacua inside the affine Weyl chamber using Verma
bases and Frobenius formula techniques. Theories with fermions in pure
representations are generally strongly coupled. The only exceptions are the
four-index symmetric representation of $su(2)$ and adjoint representation of
$su(N_c)$. However, we find a plethora of admissible theories with fermions in
mixed representations. A sub-class of these theories have degenerate
perturbative vacua separated by domain walls. In particular, $su(N_c)$ theories
with fermions in the mixed representations adjoint$\oplus$fundamental and
adjoint$\oplus$two-index symmetric admit degenerate vacua that spontaneously
break the parity ${\cal P}$, charge conjugation ${\cal C}$, and time reversal
${\cal T}$ symmetries. These are the first examples of strictly weakly coupled
gauge theories on $\mathbb R^3 \times \mathbb S^1$ with spontaneously broken
${\cal C}$, ${\cal P}$, and ${\cal T}$ symmetries. We also compute the fermion
zero modes in the background of monopole-instantons. The monopoles and their
composites (topological molecules) proliferate in the vacuum leading to the
confinement of electric charges. Interestingly enough, some theories have also
accidental degenerate vacua, which are not related by any symmetry. These vacua
admit different numbers of fermionic zero modes, and hence, different kinds of
topological molecules. The lack of symmetry, however, indicates that such
degeneracy might be lifted by higher order corrections.Comment: 53 pages; a new section is added on the phase structure of theories
with fermions in the adjoint+fundamental representations, typos corrected,
references and figures added, matches the published versio | Classification of compactified $su(N_c)$ gauge theories with fermions in
all representations | classification of compactified $su(n_c)$ gauge theories with fermions in all representations | classify mathbb mathbb massless fermions representations obeying mathbb asymptotically weakly infrared amenable treatment. carefully identifying vacua affine weyl chamber verma bases frobenius techniques. fermions representations coupled. exceptions adjoint plethora admissible fermions representations. degenerate perturbative vacua separated walls. fermions representations adjoint oplus adjoint oplus admit degenerate vacua spontaneously break parity conjugation reversal symmetries. strictly weakly mathbb mathbb spontaneously broken symmetries. fermion monopole instantons. monopoles composites topological proliferate confinement charges. interestingly accidental degenerate vacua symmetry. vacua admit fermionic kinds topological molecules. degeneracy lifted pages fermions adjoint representations typos corrected matches versio | non_dup | [] |
93944200 | 10.1007/JHEP12(2017)029 | We use holography to investigate the process of homogeneous isotropization
and thermalization in a strongly coupled $\mathcal{N} = 4$ Super Yang-Mills
plasma charged under a $U(1)$ subgroup of the global $SU(4)$ R-symmetry which
features a critical point in its phase diagram. Isotropization dynamics at late
times is affected by the critical point in agreement with the behavior of the
characteristic relaxation time extracted from the analysis of the lowest
non-hydrodynamic quasinormal mode in the $SO(3)$ quintuplet (external scalar)
channel of the theory. In particular, the isotropization time may decrease or
increase as the chemical potential increases depending on whether one is far or
close enough to the critical point, respectively. On the other hand, the
thermalization time associated with the equilibration of the scalar condensate,
which happens only after the system has relaxed to a (nearly) isotropic state,
is found to always increase with chemical potential in agreement with the
characteristic relaxation time associated to the lowest non-hydrodynamic
quasinormal mode in the $SO(3)$ singlet (dilaton) channel. These conclusions
about the late dynamics of the system are robust in the sense that they hold
for different initial conditions seeding the time evolution of the
far-from-equilibrium plasma.Comment: 66 pages, 27 figures, calculation of the QNMs of the dilaton channel
added, revised conclusions. Accepted for publication in JHEP. v4: typos
correcte | Homogeneous isotropization and equilibration of a strongly coupled
plasma with a critical point | homogeneous isotropization and equilibration of a strongly coupled plasma with a critical point | holography homogeneous isotropization thermalization mathcal super mills subgroup diagram. isotropization relaxation hydrodynamic quasinormal quintuplet theory. isotropization respectively. thermalization equilibration condensate happens relaxed nearly isotropic relaxation hydrodynamic quasinormal singlet dilaton channel. robust hold seeding pages qnms dilaton revised conclusions. publication jhep. typos correcte | non_dup | [] |
83866138 | 10.1007/JHEP12(2017)030 | We investigate the consequences of a generalized
$\mathbb{Z}_2\times\mathbb{Z}_2$ symmetry on a scaling neutrino Majorana mass
matrix. It enables us to determine definite analytical relations between the
mixing angles $\theta_{12}$ and $\theta_{13}$, maximal CP violation for the
Dirac type and vanishing for the Majorana type. Beside the other testable
predictions on the low energy neutrino parameters such as $\beta\beta_{0\nu}$
decay matrix element $|M_{ee}|$ and the light neutrino masses $m_{1,2,3}$, the
model also has intriguing consequences from the perspective of leptogenesis.
With the assumption that the required CP violation for leptogenesis is created
by the decay of lightest ($N_1$) of the heavy Majorana neutrinos, only
$\tau$-flavored leptogenesis scenario is found to be allowed in this model. For
a normal (inverted) ordering of light neutrino masses, $\theta_{23}$ is found
be less (greater) than its maximal value, for the final baryon asymmetry $Y_B$
to be in the observed range. Besides, an upper and a lower bound on the mass of
$N_1$ have also been estimated. Effect of the heavier neutrinos $N_{2,3}$ on
final $Y_B$ has been worked out subsequently. The predictions of this model
will be tested in the experiments such as nEXO, LEGEND, GERDA-II, T2K,
NO$\nu$A, DUNE etc.Comment: 37 pages, 12 figures, 9 tables, version accepted for publication in
JHE | Generalized $\mathbb{Z}_2\times \mathbb{Z}_2$ in Scaling neutrino
Majorana mass matrix and baryogenesis via flavored leptogenesis | generalized $\mathbb{z}_2\times \mathbb{z}_2$ in scaling neutrino majorana mass matrix and baryogenesis via flavored leptogenesis | consequences mathbb mathbb majorana matrix. enables definite angles theta theta maximal violation dirac vanishing majorana type. beside testable beta beta intriguing consequences perspective leptogenesis. violation leptogenesis created lightest majorana neutrinos flavored leptogenesis model. inverted ordering theta maximal baryon asymmetry range. besides estimated. heavier neutrinos worked subsequently. nexo legend gerda dune pages tables publication | non_dup | [] |
93954075 | 10.1007/JHEP12(2017)032 | Double-soft theorems, like its single-soft counterparts, arises from the
underlying symmetry principles that constrain the interactions of massless
particles. While single soft theorems can be derived in a non-perturbative
fashion by employing current algebras, recent attempts of extending such an
approach to known double soft theorems has been met with difficulties. In this
work, we have traced the difficulty to two inequivalent expansion schemes,
depending on whether the soft limit is taken asymmetrically or symmetrically,
which we denote as type A and B respectively. We show that soft-behaviour for
type A scheme can simply be derived from single soft theorems, and are thus
non-preturbatively protected. For type B, the information of the four-point
vertex is required to determine the corresponding soft theorems, and thus are
in general not protected. This argument can be readily extended to general
multi-soft theorems. We also ask whether unitarity can be emergent from
locality together with the two kinds of soft theorems, which has not been fully
investigated before.Comment: 45 pages, 7 figure | On the Symmetry Foundation of Double Soft Theorems | on the symmetry foundation of double soft theorems | theorems counterparts arises principles constrain massless particles. theorems perturbative fashion employing algebras attempts extending theorems difficulties. traced difficulty inequivalent schemes asymmetrically symmetrically respectively. theorems preturbatively protected. theorems protected. argument readily theorems. unitarity emergent locality kinds theorems pages | non_dup | [] |
93937825 | 10.1007/JHEP12(2017)033 | We investigate how super-Planckian axions can arise when type IIB 3-form flux
is used to restrict a two-axion field space to a one-dimensional winding
trajectory. If one does not attempt to address notoriously complicated issues
like Kahler moduli stabilization, SUSY-breaking and inflation, this can be done
very explicitly. We show that the presence of flux generates flat monodromies
in the moduli space which we therefore call 'Monodromic Moduli Space'. While we
do indeed find long axionic trajectories, these are non-geodesic. Moreover, the
length of geodesics remains highly constrained, in spite of the (finite)
monodromy group introduced by the flux. We attempt to formulate this in terms
of a 'Moduli Space Size Conjecture'. Interesting mathematical structures arise
in that the relevant spaces turn out to be fundamental domains of congruence
subgroups of the modular group. In addition, new perspectives on inflation in
string theory emerge.Comment: 35 pages, 10 figures; v3: references added, new section adde | Flat Monodromies and a Moduli Space Size Conjecture | flat monodromies and a moduli space size conjecture | super planckian axions arise restrict axion winding trajectory. attempt notoriously complicated kahler moduli stabilization susy breaking inflation explicitly. generates monodromies moduli call monodromic moduli axionic trajectories geodesic. geodesics constrained spite monodromy flux. attempt formulate moduli conjecture mathematical arise congruence subgroups modular group. perspectives inflation pages adde | non_dup | [] |
93948203 | 10.1007/JHEP12(2017)035 | Supergravity theories in more than four dimensions with grand unified gauge
symmetries are an important intermediate step towards the ultraviolet
completion of the Standard Model in string theory. Using toric geometry, we
classify and analyze six-dimensional F-theory vacua with gauge group SO(10)
taking into account Mordell-Weil U(1) and discrete gauge factors. We determine
the full matter spectrum of these models, including charged and neutral SO(10)
singlets. Based solely on the geometry, we compute all matter multiplicities
and confirm the cancellation of gauge and gravitational anomalies independent
of the base space. Particular emphasis is put on symmetry enhancements at the
loci of matter fields and to the frequent appearance of superconformal points.
They are linked to non-toric K\"ahler deformations which contribute to the
counting of degrees of freedom. We compute the anomaly coefficients for these
theories as well by using a base-independent blow-up procedure and
superconformal matter transitions. Finally, we identify six-dimensional
supergravity models which can yield the Standard Model with high-scale
supersymmetry by further compactification to four dimensions in an Abelian flux
background.Comment: 64 pages, 40 pages appendices, 18 figures, 6 Tables, references
added, published versio | The Toric SO(10) F-Theory Landscape | the toric so(10) f-theory landscape | supergravity grand unified symmetries ultraviolet completion theory. toric classify analyze vacua mordell weil factors. neutral singlets. solely multiplicities confirm cancellation gravitational anomalies space. emphasis enhancements loci frequent appearance superconformal points. toric ahler deformations counting freedom. anomaly blow superconformal transitions. supergravity supersymmetry compactification abelian pages pages appendices tables versio | non_dup | [] |
83863622 | 10.1007/JHEP12(2017)036 | Despite the fact that experimentally with a high degree of statistical
significance only a single Standard Model--like Higgs boson is discovered at
the LHC, extended Higgs sectors with multiple scalar fields not excluded by
combined fits of the data are more preferable theoretically for internally
consistent realistic models of particle physics. We analyze the inflationary
scenarios which could be induced by the two-Higgs doublet potential of the
Minimal Supersymmetric Standard Model (MSSM) where five scalar fields have
nonminimal couplings to gravity. Observables following from such MSSM-inspired
multifield inflation are calculated and a number of consistent inflationary
scenarios are constructed. Cosmological evolution with different initial
conditions for the multifield system leads to consequences fully compatible
with observational data on the spectral index and the tensor-to-scalar ratio.
It is demonstrated that the strong coupling approximation is precise enough to
describe such inflationary scenarios.Comment: 27 pages, 4 figures, 5 tables. Version to appear in JHEP. Additions
made to the text of the Introduction dealing with the issues of conformity of
this multifield model and models of N=1 supergravity (pages 2-3). Added new
inflationary scenarios, which are an artifact of such analysis (pages 11-12,
Tables 1-4). Additional comments on page 9 and page 13. New references adde | MSSM-inspired multifield inflation | mssm-inspired multifield inflation | experimentally boson discovered sectors excluded fits preferable theoretically internally realistic physics. analyze inflationary scenarios doublet supersymmetric mssm nonminimal couplings gravity. observables mssm inspired multifield inflation inflationary scenarios constructed. cosmological multifield consequences compatible observational ratio. precise inflationary pages tables. jhep. additions dealing conformity multifield supergravity pages inflationary scenarios artifact pages tables comments adde | non_dup | [] |
84091078 | 10.1007/JHEP12(2017)037 | We reconsider QCD factorization for the leading power contribution to the
$\gamma^{\ast} \gamma \to \pi^0$ form factor $F_{\gamma^{\ast} \gamma \to
\pi^0} (Q^2)$ at one loop using the evanescent operator approach, and
demonstrate the equivalence of the resulting factorization formulae derived
with distinct prescriptions of $\gamma_5$ in dimensional regularization.
Applying the light-cone QCD sum rules (LCSRs) with photon distribution
amplitudes (DAs) we further compute the subleading power contribution to the
pion-photon form factor induced by the "hadronic" component of the real photon
at the next-to-leading-order in ${\cal O}(\alpha_s)$, with both naive
dimensional regularization and 't Hooft-Veltman schemes of $\gamma_5$.
Confronting our theoretical predictions of $F_{\gamma^{\ast} \gamma \to \pi^0}
(Q^2)$ with the experimental measurements from the BaBar and the Belle
Collaborations implies that a reasonable agreement can be achieved without
introducing an "exotic" end-point behaviour for the twist-2 pion DA.Comment: 36 pages, 8 figure | Subleading power corrections to the pion-photon transition form factor
in QCD | subleading power corrections to the pion-photon transition form factor in qcd | reconsider factorization gamma gamma gamma gamma evanescent equivalence factorization formulae prescriptions gamma regularization. cone lcsrs amplitudes subleading pion hadronic alpha naive regularization hooft veltman schemes gamma confronting gamma gamma babar belle collaborations reasonable introducing exotic twist pion pages | non_dup | [] |
86421324 | 10.1007/JHEP12(2017)038 | In this paper, we investigate the expansion of tree level multitrace
Einstein-Yang-Mills (EYM) amplitudes. First, we propose two types of recursive
expansions of tree level EYM amplitudes with an arbitrary number of gluons,
gravitons and traces by those amplitudes with fewer traces or/and gravitons.
Then we give many support evidence, including proofs using the Cachazo-He-Yuan
(CHY) formula and Britto-Cachazo-Feng-Witten (BCFW) recursive relation. As a
byproduct, two types of generalized BCJ relations for multitrace EYM are
further proposed, which will be useful in the BCFW proof. After one applies the
recursive expansions repeatedly, any multitrace EYM amplitudes can be given in
the Kleiss-Kuijf (KK) basis of tree level color ordered Yang-Mills (YM)
amplitudes. Thus the Bern-Carrasco-Johansson (BCJ) numerators, as the expansion
coefficients, for all multitrace EYM amplitudes are naturally constructed.Comment: 89 pages, 4 figures; v2: minor modification in the notation for
Parke-Taylor factor, published versio | Expansion of All Multitrace Tree Level EYM Amplitudes | expansion of all multitrace tree level eym amplitudes | multitrace einstein mills amplitudes. propose recursive expansions amplitudes gluons gravitons traces amplitudes fewer traces gravitons. proofs cachazo yuan britto cachazo feng witten bcfw recursive relation. byproduct multitrace bcfw proof. applies recursive expansions repeatedly multitrace amplitudes kleiss kuijf ordered mills amplitudes. bern carrasco johansson numerators multitrace amplitudes naturally pages minor modification notation parke taylor versio | non_dup | [] |
84332874 | 10.1007/JHEP12(2017)041 | We study several different types of BPS flows within minimal $\mathcal{N}=1$,
$D=7$ supergravity with $\textrm{SU}(2)$ gauge group and non-vanishing
topological mass. After reviewing some known domain wall solutions involving
only the metric and the $\mathbb{R}^{+}$ scalar field, we move to considering
more general flows involving a "dyonic" profile for the 3-form gauge potential.
In this context, we consider flows featuring a $\textrm{Mkw}_{3}$ as well as an
$\textrm{AdS}_{3}$ slicing, write down the corresponding flow equations, and
integrate them analytically to obtain many examples of asymptotically
$\mathrm{AdS}_7$ solutions in presence of a running 3-form. Furthermore, we
move to adding the possibility of non-vanishing vector fields, find the new
corresponding flows and integrate them numerically. Finally, we discuss the
eleven-dimensional interpretation of the aforementioned solutions as effective
descriptions of $\mathrm{M2}-\mathrm{M5}$ bound states.Comment: 35 pages, 2 figure | BPS objects in D=7 supergravity and their M-theory origin | bps objects in d=7 supergravity and their m-theory origin | flows mathcal supergravity textrm vanishing topological mass. reviewing involving mathbb move flows involving dyonic potential. flows featuring textrm textrm slicing integrate analytically asymptotically mathrm running form. move adding vanishing flows integrate numerically. eleven aforementioned descriptions mathrm mathrm pages | non_dup | [] |
73416680 | 10.1007/JHEP12(2017)042 | We present a new construction of four dimensional $\mathcal N=3$ theories,
given by M5 branes wrapping a $T^2$ in an M-theory U-fold background. The
resulting setup generalizes the one used in the usual class $\mathcal S$
construction of four dimensional theories by using an extra discrete symmetry
on the M5 worldvolume. Together with the M-theory U-fold description of $(0,2)$
$E$-type six-dimensional SCFTs, this allows to construct new, exceptional,
$\mathcal N=3$ theories.Comment: v2: Minor modifications, version to appear in JHE | Exceptional $\mathcal N=3$ theories | exceptional $\mathcal n=3$ theories | mathcal branes wrapping background. setup generalizes usual mathcal extra worldvolume. scfts exceptional mathcal minor modifications | non_dup | [] |
93939681 | 10.1007/JHEP12(2017)043 | We consider di-jet production in hadron collisions where a transverse veto is
imposed on radiation for (pseudo-)rapidities in the central region only, where
this central region is defined with rapidity cutoff. For the case where the
transverse measurement (e.g., transverse energy or min $p_T$ for jet veto) is
parametrically larger relative to the typical transverse momentum beyond the
cutoff, the cross section is insensitive to the cutoff parameter and is
factorized in terms of collinear and soft degrees of freedom. The virtuality
for these degrees of freedom is set by the transverse measurement, as in
typical transverse-momentum dependent observables such as Drell-Yan, Higgs
production, and the event shape broadening. This paper focuses on the other
region, where the typical transverse momentum below and beyond the cutoff is of
similar size. In this region the rapidity cutoff further resolves soft
radiation into (u)soft and soft-collinear radiation with different rapidities
but identical virtuality. This gives rise to rapidity logarithms of the
rapidity cutoff parameter which we resum using renormalization group methods.
We factorize the cross section in this region in terms of soft and collinear
functions in the framework of soft-collinear effective theory, then further
refactorize the soft function as a convolution of the (u)soft and
soft-collinear functions. All these functions are calculated at one-loop order.
As an example, we calculate a differential cross section for a specific
partonic channel, $q q' \to q q'$, for the jet shape angularities and show that
the refactorization allows us to resum the rapidity logarithms and
significantly reduce theoretical uncertainties in the jet shape spectrum | Transverse Vetoes with Rapidity Cutoff in SCET | transverse vetoes with rapidity cutoff in scet | hadron collisions veto imposed pseudo rapidities rapidity cutoff. e.g. veto parametrically cutoff insensitive cutoff factorized collinear freedom. virtuality freedom observables drell broadening. focuses cutoff size. rapidity cutoff resolves collinear rapidities virtuality. rapidity logarithms rapidity cutoff resum renormalization methods. factorize collinear collinear refactorize convolution collinear functions. order. partonic angularities refactorization resum rapidity logarithms | non_dup | [] |
86417253 | 10.1007/JHEP12(2017)044 | Axion-like particles (ALPs), which are gauge-singlets under the Standard
Model (SM), appear in many well-motivated extensions of the SM. Describing the
interactions of ALPs with SM fields by means of an effective Lagrangian, we
discuss ALP decays into SM particles at one-loop order, including for the first
time a calculation of the $a\to\pi\pi\pi$ decay rates for ALP masses below a
few GeV. We argue that, if the ALP couples to at least some SM particles with
couplings of order $(0.01-1) \mbox{TeV}^{-1}$, its mass must be above 1 MeV.
Taking into account the possibility of a macroscopic ALP decay length, we show
that large regions of so far unconstrained parameter space can be explored by
searches for the exotic, on-shell Higgs and $Z$ decays $h\to Za$, $h\to aa$ and
$Z\to\gamma a$ in Run-2 of the LHC with an integrated luminosity of 300
fb$^{-1}$. This includes the parameter space in which ALPs can explain the
anomalous magnetic moment of the muon. Considering subsequent ALP decays into
photons and charged leptons, we show that the LHC provides unprecedented
sensitivity to the ALP-photon and ALP-lepton couplings in the mass region above
a few MeV, even if the relevant ALP couplings are loop suppressed and the
$a\to\gamma\gamma$ and $a\to\ell^+\ell^-$ branching ratios are significantly
less than 1. We also discuss constraints on the ALP parameter space from
electroweak precision tests.Comment: 63 pages, 28 figures. The presentation of constraints from ALP decays
in photons and leptons is extended, benchmarks are added, limits on ALPs from
a Babar search for four muon final states are computed, bounds from the
non-observation of a photon bursts in supernovae are included and the
validity of the Edelweiss bounds is discussed. This version matches the
version published in JHE | Collider Probes of Axion-Like Particles | collider probes of axion-like particles | axion alps singlets motivated extensions describing alps lagrangian decays gev. argue couples couplings mbox mev. macroscopic unconstrained explored searches exotic decays gamma luminosity alps anomalous moment muon. decays photons leptons unprecedented lepton couplings couplings suppressed gamma gamma branching electroweak precision pages figures. presentation decays photons leptons benchmarks alps babar muon bounds bursts supernovae validity edelweiss bounds discussed. matches | non_dup | [] |
93940029 | 10.1007/JHEP12(2017)045 | We study constraints coming from the modular invariance of the partition
function of two-dimensional conformal field theories. We constrain the spectrum
of CFTs in the presence of holomorphic and anti-holomorphic currents using the
semi-definite programming. In particular, we find the bounds on the twist gap
for the non-current primaries depend dramatically on the presence of
holomorphic currents, showing numerous kinks and peaks. Various rational CFTs
are realized at the numerical boundary of the twist gap, saturating the upper
limits on the degeneracies. Such theories include Wess-Zumino-Witten models for
the Deligne's exceptional series, the Monster CFT and the Baby Monster CFT. We
also study modular constraints imposed by $\mathcal{W}$-algebras of various
type and observe that the bounds on the gap depend on the choice of
$\mathcal{W}$-algebra in the small central charge region.Comment: 49 pages, 23 figure | Modular Constraints on Conformal Field Theories with Currents | modular constraints on conformal field theories with currents | coming modular invariance partition conformal theories. constrain cfts holomorphic holomorphic currents definite programming. bounds twist primaries dramatically holomorphic currents numerous kinks peaks. rational cfts realized twist saturating degeneracies. wess zumino witten deligne exceptional monster baby monster cft. modular imposed mathcal algebras bounds mathcal pages | non_dup | [] |
86418066 | 10.1007/JHEP12(2017)046 | The photon PDF of the proton is needed for precision comparisons of LHC cross
sections with theoretical predictions. In a recent paper, we showed how the
photon PDF could be determined in terms of the electromagnetic proton structure
functions $F_2$ and $F_L$ measured in electron-proton scattering experiments,
and gave an explicit formula for the PDF including all terms up to
next-to-leading order. In this paper we give details of the derivation. We
obtain the photon PDF using the factorisation theorem and applying it to
suitable BSM hard scattering processes. We also obtain the same PDF in a
process-independent manner using the usual definition of PDFs in terms of
light-cone Fourier transforms of products of operators. We show how our method
gives an exact representation for the photon PDF in terms of $F_2$ and $F_L$,
valid to all orders in QED and QCD, and including all non-perturbative
corrections. This representation is then used to give an explicit formula for
the photon PDF to one order higher than our previous result. We also generalise
our results to obtain formul\ae\ for the polarised photon PDF, as well as the
photon TMDPDF. Using our formula, we derive the $P_{\gamma i}$ subset of DGLAP
splitting functions to order $\alpha \alpha_s$ and $\alpha^2$, which agree with
known results. We give a detailed explanation of the approach that we follow to
determine a photon PDF and its uncertainty within the above framework.Comment: 75 pages, 25 figures, data files corresponding to the figures
available at http://doi.org/10.5281/zenodo.837233, LUXqed17 PDF files
available in LHAPDF, references added in v | The Photon Content of the Proton | the photon content of the proton | proton precision comparisons predictions. electromagnetic proton proton gave order. derivation. factorisation processes. manner usual pdfs cone fourier transforms operators. valid orders perturbative corrections. result. generalise formul polarised tmdpdf. derive gamma dglap splitting alpha alpha alpha agree results. explanation pages files zenodo. luxqed files lhapdf | non_dup | [] |
74250760 | 10.1007/JHEP12(2017)047 | A first-principles approach to the unitarity problem for black holes is
systematically explored, based on the postulates of 1) quantum mechanics 2) the
ability to approximately locally divide quantum gravitational systems into
subsystems 3) correspondence with quantum field theory predictions for
appropriate observers and (optionally) 4) universality of new gravitational
effects. Unitarity requires interactions between the internal state of a black
hole and its surroundings that have not been identified in the field theory
description; correspondence with field theory indicates that these are soft. A
conjectured information-theoretic result for information transfer between
subsystems, partly motivated by a perturbative argument, then constrains the
minimum coupling size of these interactions of the quantum atmosphere of a
black hole. While large couplings are potentially astronomically observable,
given this conjecture one finds that the new couplings can be exponentially
small in the black hole entropy, yet achieve the information transfer rate
needed for unitarization, due to the large number of black hole internal
states. This provides a new possible alternative to arguments for large effects
near the horizon. If universality is assumed, these couplings can be described
as small, soft, state-dependent fluctuations of the metric near the black hole.
Open questions include that of the more fundamental basis for such an effective
picture.Comment: 31 pages, 1 figur | Nonviolent unitarization: basic postulates to soft quantum structure of
black holes | nonviolent unitarization: basic postulates to soft quantum structure of black holes | principles unitarity holes systematically explored postulates mechanics locally divide gravitational subsystems correspondence observers optionally universality gravitational effects. unitarity surroundings correspondence soft. conjectured theoretic subsystems partly motivated perturbative argument constrains atmosphere hole. couplings potentially astronomically observable conjecture finds couplings exponentially unitarization states. arguments horizon. universality couplings hole. pages figur | non_dup | [] |
83862833 | 10.1007/JHEP12(2017)048 | Assuming locality, Lorentz invariance and parity conservation we obtain a set
of differential equations governing the 3-point interactions of massless
bosons, which in turn determines the polynomial ring of these amplitudes. We
derive all possible 3-point interactions for tensor fields with polarisations
that have total symmetry and mixed symmetry under permutations of Lorentz
indices. Constraints on the existence of gauge-invariant cubic vertices for
totally symmetric fields are obtained in general spacetime dimensions and are
compared with existing results obtained in the covariant and light-cone
approaches. Expressing our results in spinor helicity formalism we reproduce
the perhaps mysterious mismatch between the covariant approach and the light
cone approach in 4 dimensions. Our analysis also shows that there exists a
mismatch, in the 3-point gauge invariant amplitudes corresponding to cubic
self-interactions, between a scalar field $\phi$ and an antisymmetric rank-2
tensor field $A_{\mu\nu}$. Despite the well-known fact that in 4 dimensions
rank-2 anti-symmetric fields are dual to scalar fields in free theories, such
duality does not extend to interacting theories.Comment: significantly revised, final version published in JHE | On-Shell Gauge Invariant Three-Point Amplitudes | on-shell gauge invariant three-point amplitudes | locality lorentz invariance parity conservation governing massless bosons determines amplitudes. derive polarisations permutations lorentz indices. cubic totally spacetime covariant cone approaches. expressing spinor helicity formalism reproduce perhaps mysterious mismatch covariant cone dimensions. mismatch amplitudes cubic antisymmetric duality extend interacting revised | non_dup | [] |
73403862 | 10.1007/JHEP12(2017)049 | We study stress tensor correlation functions in four-dimensional conformal
field theories with large $N$ and a sparse spectrum. Theories in this class are
expected to have local holographic duals, so effective field theory in anti-de
Sitter suggests that the stress tensor sector should exhibit universal,
gravity-like behavior. At the linearized level, the hallmark of locality in the
emergent geometry is that stress tensor three-point functions $\langle
TTT\rangle$, normally specified by three constants, should approach a universal
structure controlled by a single parameter as the gap to higher spin operators
is increased. We demonstrate this phenomenon by a direct CFT calculation.
Stress tensor exchange, by itself, violates causality and unitarity unless the
three-point functions are carefully tuned, and the unique consistent choice
exactly matches the prediction of Einstein gravity. Under some assumptions
about the other potential contributions, we conclude that this structure is
universal, and in particular, that the anomaly coefficients satisfy $a\approx
c$ as conjectured by Camanho et al. The argument is based on causality of a
four-point function, with kinematics designed to probe bulk locality, and
invokes the chaos bound of Maldacena, Shenker, and Stanford.Comment: 24+9 pages; minor changes, conclusions unchange | Einstein gravity 3-point functions from conformal field theory | einstein gravity 3-point functions from conformal field theory | conformal sparse spectrum. holographic duals sitter exhibit universal behavior. linearized hallmark locality emergent langle rangle normally specified universal increased. phenomenon calculation. violates causality unitarity unless carefully tuned matches einstein gravity. assumptions universal anomaly satisfy approx conjectured camanho argument causality kinematics locality invokes chaos maldacena shenker pages minor unchange | non_dup | [] |
93939050 | 10.1007/JHEP12(2017)050 | Recently, a physical derivation of the Alday-Gaiotto-Tachikawa correspondence
has been put forward. A crucial role is played by the complex Chern-Simons
theory arising in the 3d-3d correspondence, whose boundary modes lead to Toda
theory on a Riemann surface. We explore several features of this derivation and
subsequently argue that it can be extended to a generalization of the AGT
correspondence. The latter involves codimension two defects in six dimensions
that wrap the Riemann surface. We use a purely geometrical description of these
defects and find that the generalized AGT setup can be modeled in a pole region
using generalized conifolds. Furthermore, we argue that the ordinary conifold
clarifies several features of the derivation of the original AGT
correspondence.Comment: 27+2 pages, 3 figure | Generalized Toda Theory from Six Dimensions and the Conifold | generalized toda theory from six dimensions and the conifold | derivation alday gaiotto tachikawa correspondence forward. crucial played chern simons arising correspondence toda riemann surface. explore derivation subsequently argue generalization correspondence. involves codimension defects wrap riemann surface. purely geometrical defects setup modeled pole conifolds. argue ordinary conifold clarifies derivation pages | non_dup | [] |
86415430 | 10.1007/JHEP12(2017)051 | Pileup involves the contamination of the energy distribution arising from the
primary collision of interest (leading vertex) by radiation from soft
collisions (pileup). We develop a new technique for removing this contamination
using machine learning and convolutional neural networks. The network takes as
input the energy distribution of charged leading vertex particles, charged
pileup particles, and all neutral particles and outputs the energy distribution
of particles coming from leading vertex alone. The PUMML algorithm performs
remarkably well at eliminating pileup distortion on a wide range of simple and
complex jet observables. We test the robustness of the algorithm in a number of
ways and discuss how the network can be trained directly on data.Comment: 20 pages, 8 figures, 2 tables. Updated to JHEP versio | Pileup Mitigation with Machine Learning (PUMML) | pileup mitigation with machine learning (pumml) | pileup involves contamination arising collision collisions pileup removing contamination machine convolutional networks. pileup neutral outputs coming alone. pumml performs remarkably eliminating pileup distortion observables. robustness ways trained pages tables. updated jhep versio | non_dup | [] |
83864076 | 10.1007/JHEP12(2017)052 | Soft behaviours of S-matrix for massless theories reflect the underlying
symmetry principle that enforces its masslessness. As an expansion in soft
momenta, sub-leading soft theorems can arise either due to (I) unique structure
of the fundamental vertex or (II) presence of enhanced broken-symmetries. While
the former is expected to be modified by infrared or ultraviolet divergences,
the latter should remain exact to all orders in perturbation theory. Using
current algebra, we clarify such distinction for spontaneously broken (super)
Poincar\'e and (super) conformal symmetry. We compute the UV divergences of
DBI, conformal DBI, and A-V theory to verify the exactness of type (II) soft
theorems, while type (I) are shown to be broken and the soft-modifying
higher-dimensional operators are identified. As further evidence for the
exactness of type (II) soft theorems, we consider the alpha' expansion of both
super and bosonic open strings amplitudes, and verify the validity of the
translation symmetry breaking soft-theorems up to O(alpha'^6). Thus the
massless S-matrix of string theory "knows" about the presence of D-branes.Comment: 35 pages. Additional mathematica note book with the UV-divergenece of
the 6-point amplitude in AV/KS theor | On the exactness of soft theorems | on the exactness of soft theorems | behaviours massless reflect enforces masslessness. momenta theorems arise broken symmetries. former infrared ultraviolet divergences orders perturbation theory. clarify distinction spontaneously broken super poincar super conformal symmetry. divergences conformal verify exactness theorems broken modifying identified. exactness theorems alpha super bosonic strings amplitudes verify validity translation breaking theorems alpha massless knows pages. mathematica book divergenece theor | non_dup | [] |
93936647 | 10.1007/JHEP12(2017)053 | In many extensions of the standard model, there exist a few extra Higgs
bosons. Suppose a heavy neutral Higgs boson H is discovered at the LHC, one
could then investigate CP and CPT~ properties of its couplings to a pair of $Z$
bosons through $H \to ZZ \to 4\ell$. We use the helicity-amplitude method to
write down the most general form for the angular distributions of the four
final-state leptons, which can cover the case of CP-even, -odd, and -mixed
state for the Higgs boson. We figure out there are 9 types of angular
observables and all the $H$ couplings to $Z$ bosons can be fully determined by
exploiting them. A Higgs-boson mass of 260 GeV below the $t\bar t$ threshold is
illustrated with full details. With a total of $10^3$ events of $H \to ZZ \to
4\ell$, one can determine the couplings up to 12-20\% uncertainties.Comment: 23 pages, 4 figures, 3 tables, to appear in JHE | Measuring properties of a Heavy Higgs boson in the $H\to ZZ \to 4\ell$
decay | measuring properties of a heavy higgs boson in the $h\to zz \to 4\ell$ decay | extensions extra bosons. neutral boson discovered couplings bosons helicity leptons cover boson. observables couplings bosons exploiting them. boson illustrated details. couplings pages tables | non_dup | [] |
86420550 | 10.1007/JHEP12(2017)054 | We study the fixed point that controls the IR dynamics of QED in $d = 4 -
2\epsilon$. We derive the scaling dimensions of four-fermion and bilinear
operators beyond leading order in $\epsilon$-expansion. For the four-fermion
operators, this requires the computation of a two-loop mixing that was not
known before. We then extrapolate these scaling dimensions to $d = 3$ to
estimate their value at the IR fixed point of QED$_3$ as function of the number
of fermions $N_f$. The next-to-leading order result for the four-fermion
operators corrects significantly the leading one. Our best estimate at this
order indicates that they do not cross marginality for any value of $N_f$,
which would imply that they cannot trigger a departure from the conformal
phase. For the scaling dimensions of bilinear operators, we observe better
convergence as we increase the order. In particular, $\epsilon$-expansion
provides a convincing estimate for the dimension of the flavor-singlet scalar
in the full range of $N_f$.Comment: 39 pages, 5 figure | Scaling dimensions in QED$_3$ from the $\epsilon$-expansion | scaling dimensions in qed$_3$ from the $\epsilon$-expansion | epsilon derive fermion bilinear epsilon expansion. fermion before. extrapolate fermions fermion corrects one. marginality imply trigger departure conformal phase. bilinear order. epsilon convincing flavor singlet .comment pages | non_dup | [] |
129351090 | 10.1007/JHEP12(2017)055 | We study three-point functions of operators on the $1/2$ BPS Wilson loop in
planar $\mathcal{N}=4$ super Yang-Mills theory. The operators we consider are
"defect changing operators", which change the scalar coupled to the Wilson
loop. We first perform the computation at two loops in general set-ups, and
then study a special scaling limit called the ladders limit, in which the
spectrum is known to be described by a quantum mechanics with the
SL(2,$\mathbb{R}$) symmetry. In this limit, we resum the Feynman diagrams using
the Schwinger-Dyson equation and determine the structure constants at all order
in the rescaled coupling constant. Besides providing an interesting solvable
example of defect conformal field theories, our result gives invaluable data
for the integrability-based approach to the structure constants.Comment: 31 pages + appendices; v2 References adde | Structure Constants of Defect Changing Operators on the 1/2 BPS Wilson
Loop | structure constants of defect changing operators on the 1/2 bps wilson loop | wilson planar mathcal super mills theory. defect changing wilson loop. loops ladders mechanics mathbb symmetry. resum feynman diagrams schwinger dyson rescaled constant. besides solvable defect conformal invaluable integrability pages appendices adde | non_dup | [] |
129352868 | 10.1007/JHEP12(2017)056 | Anomaly matching constrains low-energy physics of strongly-coupled field
theories, but it is not useful at finite temperature due to contamination from
high-energy states. The known exception is an 't Hooft anomaly involving
one-form symmetries as in pure $SU(N)$ Yang-Mills theory at $\theta=\pi$.
Recent development about large-$N$ volume independence, however, gives us a
circumstantial evidence that 't Hooft anomalies can also remain under circle
compactifications in some theories without one-form symmetries. We develop a
systematic procedure for deriving an 't Hooft anomaly of the
circle-compactified theory starting from the anomaly of the original
uncompactified theory without one-form symmetries, where the twisted boundary
condition for the compactified direction plays a pivotal role. As an
application, we consider $\mathbb{Z}_N$-twisted $\mathbb{C}P^{N-1}$ sigma model
and massless $\mathbb{Z}_N$-QCD, and compute their anomalies explicitly.Comment: 22 pages; (v2) references updated, minor change | Circle compactification and 't Hooft anomaly | circle compactification and 't hooft anomaly | anomaly matching constrains contamination states. exception hooft anomaly involving symmetries mills theta independence circumstantial hooft anomalies circle compactifications symmetries. deriving hooft anomaly circle compactified anomaly uncompactified symmetries twisted compactified plays pivotal role. mathbb twisted mathbb sigma massless mathbb anomalies pages updated minor | non_dup | [] |
93957153 | 10.1007/JHEP12(2017)057 | The existence of new coloured states with spin one-half, i.e. extra-quarks,
is a striking prediction of various classes of new physics models. Should one
of these states be discovered during the 13 TeV runs of the LHC or at future
high energy hadron colliders, understanding its properties will be crucial in
order to shed light on the underlying model structure. Depending on the extra-
quarks quantum number under SU(2)L, their coupling to Standard Model quarks and
bosons have either a dominant left- or right-handed chiral component. By
exploiting the polarisation properties of the top quarks arising from the decay
of pair-produced extra quarks, we show how it is possible to discriminate among
the two hypothesis in the whole discovery range currently accessible at the
LHC, thus effectively narrowing down the possible interpretations of a
discovered state in terms of new physics scenarios. Moreover, we estimate the
discovery and discrimination power of future prototype hadron colliders with
centre of mass energies of 33 and 100 TeV.Comment: 12 pages, 11 figure | Vector-like quarks coupling discrimination at the LHC and future hadron
colliders | vector-like quarks coupling discrimination at the lhc and future hadron colliders | coloured i.e. extra quarks striking models. discovered runs hadron colliders crucial shed structure. extra quarks quarks bosons handed chiral component. exploiting polarisation quarks arising extra quarks discriminate discovery accessible effectively narrowing interpretations discovered scenarios. discovery discrimination prototype hadron colliders pages | non_dup | [] |
129348932 | 10.1007/JHEP12(2017)059 | This paper presents a measurement of the triple-differential cross section
for the Drell--Yan process $Z/\gamma^*\rightarrow \ell^+\ell^-$ where $\ell$ is
an electron or a muon. The measurement is performed for invariant masses of the
lepton pairs, $m_{\ell\ell}$, between $46$ and $200$ GeV using a sample of
$20.2$ fb$^{-1}$ of $pp$ collisions data at a centre-of-mass energy of
$\sqrt{s}=8$ TeV collected by the ATLAS detector at the LHC in 2012. The data
are presented in bins of invariant mass, absolute dilepton rapidity,
$|y_{\ell\ell}|$, and the angular variable $\cos\theta^{*}$ between the
outgoing lepton and the incoming quark in the Collins--Soper frame. The
measurements are performed in the range $|y_{\ell\ell}|<2.4$ in the muon
channel, and extended to $|y_{\ell\ell}|<3.6$ in the electron channel. The
cross sections are used to determine the $Z$ boson forward-backward asymmetry
as a function of $|y_{\ell\ell}|$ and $m_{\ell\ell}$. The measurements achieve
high-precision, below the percent level in the pole region, excluding the
uncertainty in the integrated luminosity, and are in agreement with
predictions. These precision data are sensitive to the parton distribution
functions and the effective weak mixing angle.Comment: This document has 81 pages in total; the authors list starts on page
65 and ends on page 81; there are 17 figures and 10 tables; submitted to
JHEP; all figures are available at
https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2016-04 | Measurement of the Drell--Yan triple-differential cross section in $pp$
collisions at $\sqrt{s} = 8$ TeV | measurement of the drell--yan triple-differential cross section in $pp$ collisions at $\sqrt{s} = 8$ tev | presents triple drell gamma rightarrow muon. lepton collisions sqrt atlas bins dilepton rapidity theta outgoing lepton incoming collins soper frame. muon channel. boson backward asymmetry precision percent pole excluding luminosity predictions. precision parton document pages starts ends tables submitted jhep | non_dup | [] |
86416807 | 10.1007/JHEP12(2017)060 | We extract $|V_{cb}|$ from the available data in the decay $B \to
D^{(*)}\ell\nu_{\ell}$. Our analysis uses the $q^2(w)$ binned differential
decay rates in different subsamples of $B\to D\ell\nu_\ell$ ($\ell = e, \mu$),
while for the decay $B\to D^*\ell\nu_\ell$, the unfolded binned differential
decay rates of four kinematic variables including the $q^2$ bins have been
used. In the CLN and BGL parameterizations of the form factors, the combined
fit to all the available data along with their correlations yields $|V_{cb}| =
(39.77 \pm 0.89)\times 10^{-3}$ and $(40.90 \pm 0.94)\times 10^{-3}$
respectively. In these fits, we have used the inputs from lattice and light
cone sum rule (LCSR) along with the data. Using our fit results and the HQET
relations (with the known corrections included) amongst the form factors, and
parameterizing the unknown higher order corrections (in the ratios of HQET form
factors) with a conservative estimate of the normalizing parameters, we obtain
$R(D^{*}) = 0.259 \pm 0.006$ (CLN) and $R(D^*) = 0.257 \pm 0.005$ (BGL).Comment: 8 pages, 2 captioned figures (5 figures and detailed discussion
added, accepted for publication in JHEP | Extraction of $|V_{cb}|$ from $B\to D^{(*)}\ell\nu_\ell$ and the
Standard Model predictions of $R(D^{(*)})$ | extraction of $|v_{cb}|$ from $b\to d^{(*)}\ell\nu_\ell$ and the standard model predictions of $r(d^{(*)})$ | extract binned subsamples unfolded binned kinematic bins used. parameterizations respectively. fits inputs cone lcsr data. hqet amongst parameterizing unknown hqet conservative normalizing .comment pages captioned publication jhep | non_dup | [] |
93953950 | 10.1007/JHEP12(2017)061 | We investigate a special class of the $\mathcal{PT}$-symmetric quantum models
being perfectly invisible zero-gap systems with a unique bound state at the
very edge of continuous spectrum of scattering states. The family includes the
$\mathcal{PT}$-regularized two particle Calogero systems (conformal quantum
mechanics models of de Alfaro-Fubini-Furlan) and their rational extensions
whose potentials satisfy equations of the KdV hierarchy and exhibit,
particularly, a behaviour typical for extreme waves. We show that the two
simplest Hamiltonians from the Calogero subfamily determine the fluctuation
spectra around the $\mathcal{PT}$-regularized kinks arising as traveling waves
in the field-theoretical Liouville and $SU(3)$ conformal Toda systems. Peculiar
properties of the quantum systems are reflected in the associated exotic
nonlinear supersymmetry in the unbroken or partially broken phases. The
conventional $\mathcal{N}=2$ supersymmetry is extended here to the
$\mathcal{N}=4$ nonlinear supersymmetry that involves two bosonic generators
composed from Lax-Novikov integrals of the subsystems, one of which is the
central charge of the superalgebra. Jordan states are shown to play an
essential role in the construction.Comment: 33 pages; comments and refs added, version to appear in JHE | Perfectly invisible $\mathcal{PT}$-symmetric zero-gap systems, conformal
field theoretical kinks, and exotic nonlinear supersymmetry | perfectly invisible $\mathcal{pt}$-symmetric zero-gap systems, conformal field theoretical kinks, and exotic nonlinear supersymmetry | mathcal perfectly invisible states. mathcal regularized calogero conformal mechanics alfaro fubini furlan rational extensions potentials satisfy hierarchy exhibit extreme waves. simplest hamiltonians calogero subfamily fluctuation mathcal regularized kinks arising traveling liouville conformal toda systems. peculiar reflected exotic supersymmetry unbroken partially broken phases. mathcal supersymmetry mathcal supersymmetry involves bosonic generators composed novikov integrals subsystems superalgebra. jordan pages comments refs | non_dup | [] |
93952573 | 10.1007/JHEP12(2017)062 | Linear perturbations of extremal black holes exhibit the Aretakis
instability, in which higher derivatives of a scalar field grow polynomially
with time along the event horizon. This suggests that higher derivative
corrections to the classical equations of motion may become large, indicating a
breakdown of effective field theory at late time on the event horizon. We
investigate whether or not this happens. For extremal Reissner-Nordstrom we
argue that, for a large class of theories, general covariance ensures that the
higher derivative corrections to the equations of motion appear only in
combinations that remain small compared to two derivative terms so effective
field theory remains valid. For extremal Kerr, the situation is more
complicated since backreaction of the scalar field is not understood even in
the two derivative theory. Nevertheless we argue that the effects of the higher
derivative terms will be small compared to the two derivative terms as long as
the spacetime remains close to extremal Kerr.Comment: 34 page | Is there a breakdown of effective field theory at the horizon of an
extremal black hole? | is there a breakdown of effective field theory at the horizon of an extremal black hole? | perturbations extremal holes exhibit aretakis instability derivatives grow polynomially horizon. breakdown horizon. happens. extremal reissner nordstrom argue covariance ensures combinations valid. extremal kerr complicated backreaction understood theory. nevertheless argue spacetime extremal | non_dup | [] |
86417270 | 10.1007/JHEP12(2017)063 | We provide the complete set of predictions needed to achieve NLO accuracy in
the Standard Model Effective Field Theory at dimension six for Higgs production
in gluon fusion. In particular, we compute for the first time the contribution
of the chromomagnetic operator $ \bar Q_L \Phi \sigma q_R G$ at NLO in QCD,
which entails two-loop virtual and one-loop real contributions, as well as
renormalisation and mixing with the Yukawa operator $\Phi^\dagger \Phi\, \bar
Q_L \Phi q_R$ and the gluon-fusion operator $\Phi^\dagger \Phi\, GG$. Focusing
on the top-quark-Higgs couplings, we consider the phenomenological impact of
the NLO corrections in constraining the three relevant operators by
implementing the results into the MadGraph5_aMC@NLO framework. This allows us
to compute total cross sections as well as to perform event generation at NLO
that can be directly employed in experimental analyses.Comment: 30 pages. This version includes the corrections of our Erratum
published in JHEP (2018) 2018: 15 | Gluon-fusion Higgs production in the Standard Model Effective Field
Theory | gluon-fusion higgs production in the standard model effective field theory | gluon fusion. chromomagnetic sigma entails virtual renormalisation yukawa dagger gluon fusion dagger focusing couplings phenomenological constraining implementing madgraph framework. pages. erratum jhep | non_dup | [] |
84329028 | 10.1007/JHEP12(2017)064 | We present the minimal model of electroweak baryogenesis induced by fermions.
The model consists of an extension of the Standard Model with one electroweak
singlet fermion and one pair of vector like doublet fermions with
renormalizable couplings to the Higgs. A strong first order phase transition is
radiatively induced by the singlet-doublet fermions, while the origin of the
baryon asymmetry is due to asymmetric reflection of the same set of fermions on
the expanding electroweak bubble wall. The singlet-doublet fermions are
stabilized at the electroweak scale by chiral symmetries and the Higgs
potential is stabilized by threshold corrections coming from a multi-TeV
ultraviolet completion which does not play any significant role in the phase
transition. We work in terms of background symmetry invariants and perform an
analytic semiclassical calculation of the baryon asymmetry, showing that the
model may effectively generate the observed baryon asymmetry for percent level
values of the unique invariant CP violating phase of the singlet-doublet
sector. We include a detailed study of electron electric dipole moment and
electroweak precision limits, and for one typical benchmark scenario we also
recast existing collider constraints, showing that the model is consistent with
all current experimental data. We point out that fermion induced electroweak
baryogenesis has irreducible phenomenology at the $13 \, \textrm{TeV}$ LHC
since the new fermions must be at the electroweak scale, have electroweak
quantum numbers and couple strongly with the Higgs. The most promising searches
involve topologies with multiple leptons and missing energy in the final state.Comment: 30 + 10 pages, 6 figure | The minimal fermionic model of electroweak baryogenesis | the minimal fermionic model of electroweak baryogenesis | electroweak baryogenesis fermions. electroweak singlet fermion doublet fermions renormalizable couplings higgs. radiatively singlet doublet fermions baryon asymmetry asymmetric reflection fermions expanding electroweak bubble wall. singlet doublet fermions stabilized electroweak chiral symmetries stabilized coming ultraviolet completion transition. invariants analytic semiclassical baryon asymmetry effectively baryon asymmetry percent violating singlet doublet sector. dipole moment electroweak precision benchmark recast collider data. fermion electroweak baryogenesis irreducible phenomenology textrm fermions electroweak electroweak couple higgs. promising searches involve topologies leptons missing pages | non_dup | [] |
86421862 | 10.1007/JHEP12(2017)065 | We study RG flows between superconformal field theories living in different
spacetime dimensions which exhibit universal properties, independent of the
details of the UV and IR theories. In particular, when the UV and IR theories
are both even-dimensional we establish exact universal relations between their
conformal anomaly coefficients. We also provide strong evidence for similar
relations between appropriately defined free energies for RG flows between
odd-dimensional theories in the large $N$ limit. Holographically, these RG
flows across dimensions are described by asymptotically AdS black branes in a
gauged supergravity theory, which we exhibit explicitly. We also discuss the
uplift of these solutions to string and M-theory and comment on how the entropy
of such black branes is captured by the dual field theory.Comment: 64 pages, 2 figures; v2: additional comments and references, typos
fixe | Universal RG Flows Across Dimensions and Holography | universal rg flows across dimensions and holography | flows superconformal living spacetime exhibit universal theories. establish universal conformal anomaly coefficients. appropriately flows limit. holographically flows asymptotically branes gauged supergravity exhibit explicitly. uplift comment branes captured pages comments typos fixe | non_dup | [] |
129353478 | 10.1007/JHEP12(2017)066 | We compute conformal anomalies for conformal field theories with free
conformal scalars and massless spin $1/2$ fields in hyperbolic space
$\mathbb{H}^d$ and in the ball $\mathbb{B}^d$, for $2\leq d\leq 7$. These
spaces are related by a conformal transformation. In even dimensional spaces,
the conformal anomalies on $\mathbb{H}^{2n}$ and $\mathbb{B}^{2n}$ are shown to
be identical. In odd dimensional spaces, the conformal anomaly on
$\mathbb{B}^{2n+1}$ comes from a boundary contribution, which exactly coincides
with that of $\mathbb{H}^{2n+1}$ provided one identifies the UV short-distance
cutoff on $\mathbb{B}^{2n+1}$ with the inverse large distance IR cutoff on
$\mathbb{H}^{2n+1}$, just as prescribed by the conformal map. As an
application, we determine, for the first time, the conformal anomaly
coefficients multiplying the Euler characteristic of the boundary for scalars
and half-spin fields with various boundary conditions in $d=5$ and $d=7$.Comment: 16 pages. V3: small correction | Boundary Conformal Anomalies on Hyperbolic Spaces and Euclidean Balls | boundary conformal anomalies on hyperbolic spaces and euclidean balls | conformal anomalies conformal conformal scalars massless hyperbolic mathbb ball mathbb conformal transformation. conformal anomalies mathbb mathbb identical. conformal anomaly mathbb comes coincides mathbb identifies cutoff mathbb cutoff mathbb prescribed conformal map. conformal anomaly multiplying euler scalars .comment pages. | non_dup | [] |
78511685 | 10.1007/JHEP12(2017)067 | We evaluate the $\Lambda$-parameter in the $\overline{\mathrm{MS}}$ scheme
for the pure SU(3) gauge theory with the twisted gradient flow (TGF) method. A
running coupling constant $g_{\mathrm{TGF}}^2(1/L)$ is defined in a finite
volume box with size of $L^4$ with the twisted boundary condition. This defines
the TGF scheme. Using the step scaling method for the TGF coupling with lattice
simulations, we can evaluate the $\Lambda$-parameter non-perturbatively in the
TGF scheme. In this paper we determine the dimensionless ratios,
$\Lambda_{\mathrm{TGF}}/\sqrt{\sigma}$ and $r_{0}\Lambda_{\mathrm{TGF}}$
together with the $\Lambda$-parameter ratio
$\Lambda_{\mathrm{SF}}/\Lambda_{\mathrm{TGF}}$ on the lattices numerically.
Combined with the known ratio
$\Lambda_{\overline{\mathrm{MS}}}/\Lambda_{\mathrm{SF}}$, we obtain
$\Lambda_{\overline{\mathrm{MS}}}/\sqrt{\sigma} = 0.517(10)(^{+8}_{-7})$ and
$r_{0}\Lambda_{\overline{\mathrm{MS}}}=0.593(12)(^{+12}_{-9})$, where the first
error is statistical one and the second is our estimate of systematic
uncertainty.Comment: 23 pages, 11 figures, LaTe | Non-perturbative determination of the $\Lambda$-parameter in the pure
SU(3) gauge theory from the twisted gradient flow coupling | non-perturbative determination of the $\lambda$-parameter in the pure su(3) gauge theory from the twisted gradient flow coupling | lambda overline mathrm twisted method. running mathrm twisted condition. defines scheme. lambda perturbatively scheme. dimensionless lambda mathrm sqrt sigma lambda mathrm lambda lambda mathrm lambda mathrm lattices numerically. lambda overline mathrm lambda mathrm lambda overline mathrm sqrt sigma lambda overline mathrm pages | non_dup | [] |
83866385 | 10.1007/JHEP12(2017)071 | We explore a variant of the $\phi^6$ model originally proposed in Phys.\
Rev.\ D {\bf 12}, 1606 (1975) as a prototypical, so-called, "bag" model in
which domain walls play the role of quarks within hadrons. We examine the
steady state of the model, namely an apparent bound state of two kink
structures. We explore its linearization, and we find that, as a function of a
parameter controlling the curvature of the potential, an {\it effectively
arbitrary} number of internal modes may arise in the point spectrum of the
linearization about the domain wall profile. We explore some of the key
characteristics of kink-antikink collisions, such as the critical velocity and
the multi-bounce windows, and how they depend on the principal parameter of the
model. We find that the critical velocity exhibits a non-monotonic dependence
on the parameter controlling the curvature of the potential. For the
multi-bounce windows, we find that their range and complexity decrease as the
relevant parameter decreases (and as the number of internal modes in the model
increases). We use a modified collective coordinates method [in the spirit of
recent works such as {Phys.\ Rev.\ D} {\bf 94}, 085008 (2016)] in order to
capture the relevant phenomenology in a semi-analytical manner.Comment: 23 pages, 11 figures, jheppub class; v2 minor revision | Kink Dynamics in a Parametric $\phi^6$ System: A Model With Controllably
Many Internal Modes | kink dynamics in a parametric $\phi^6$ system: a model with controllably many internal modes | explore variant originally phys. rev. prototypical walls quarks hadrons. examine steady apparent kink structures. explore linearization controlling curvature effectively arise linearization profile. explore kink antikink collisions bounce windows principal model. exhibits monotonic controlling curvature potential. bounce windows collective spirit phys. rev. capture phenomenology pages jheppub minor revision | non_dup | [] |
86415829 | 10.1007/JHEP12(2017)072 | We consider the possibility that the inflaton is part of the dark sector and
interacts with the standard model through a portal interaction with a heavy
complex scalar field in equilibrium with the standard model at high energies.
The inflaton and dark matter are encapsulated in a single complex field and
both scalar sectors are charged under different (approximate) global U(1)'s
such that the dark matter, as well as the visible pseudo-scalar are taken to be
relatively light, as pseudo Nambu-Goldstone bosons of the theory. The dark
matter relic density is populated by Freeze-In productions through the inflaton
portal. In particular, after the reheating, production of dark matter by
inflaton decay is naturally suppressed thanks to Planck stringent constraints
on the dark quartic coupling, therefore preserving the non thermal scenario
from any initial condition tuning.Comment: 11 pages, 5 figures, citations added, typos corrected, comments adde | The Inflaton Portal to Dark Matter | the inflaton portal to dark matter | inflaton interacts portal energies. inflaton encapsulated sectors approximate visible pseudo pseudo nambu goldstone bosons theory. relic populated freeze productions inflaton portal. reheating inflaton naturally suppressed thanks planck stringent quartic preserving pages citations typos corrected comments adde | non_dup | [] |
86421900 | 10.1007/JHEP12(2017)073 | We calculate various quantities that characterize the dissimilarity of
reduced density matrices for a short interval of length $\ell$ in a
two-dimensional (2D) large central charge conformal field theory (CFT). These
quantities include the R\'enyi entropy, entanglement entropy, relative entropy,
Jensen-Shannon divergence, as well as the Schatten 2-norm and 4-norm. We adopt
the method of operator product expansion of twist operators, and calculate the
short interval expansion of these quantities up to order of $\ell^9$ for the
contributions from the vacuum conformal family. The formal forms of these
dissimilarity measures and the derived Fisher information metric from
contributions of general operators are also given. As an application of the
results, we use these dissimilarity measures to compare the excited and thermal
states, and examine the eigenstate thermalization hypothesis (ETH) by showing
how they behave in high temperature limit. This would help to understand how
ETH in 2D CFT can be defined more precisely. We discuss the possibility that
all the dissimilarity measures considered here vanish when comparing the
reduced density matrices of an excited state and a generalized Gibbs ensemble
thermal state. We also discuss ETH for a microcanonical ensemble thermal state
in a 2D large central charge CFT, and find that it is approximately satisfied
for a small subsystem and violated for a large subsystem.Comment: V1, 34 pages, 5 figures, see collection of complete results in the
attached Mathematica notebook; V2, 38 pages, 5 figures, published versio | Dissimilarities of reduced density matrices and eigenstate
thermalization hypothesis | dissimilarities of reduced density matrices and eigenstate thermalization hypothesis | quantities characterize dissimilarity conformal quantities enyi entanglement jensen shannon divergence schatten norm norm. adopt twist quantities conformal family. formal dissimilarity fisher given. dissimilarity excited examine eigenstate thermalization behave limit. precisely. dissimilarity vanish excited gibbs ensemble state. microcanonical ensemble satisfied subsystem violated pages attached mathematica notebook pages versio | non_dup | [] |
93939455 | 10.1007/JHEP12(2017)074 | In hadronic collisions, interference between different production channels
affects momentum distributions of multi-particle final states. As this QCD
interference does not depend on the strong coupling constant, it is part of the
no-interaction baseline that needs to be controlled prior to searching for
other manifestations of collective dynamics. Here, we introduce a model that is
based on the QCD theory of multi-parton interactions and that allows one to
study interference effects in the production of $m$ particles in hadronic
collisions with $N$ parton-parton interactions ("sources"). In an expansion in
powers of $1/(N_c^2-1)$ and to leading order in the number of sources $N$, we
calculate interference effects in the $m$-particle spectra and we determine
from them the second and fourth order cumulant momentum anisotropies $v_n$.
Without invoking any azimuthal asymmetry and any density dependent non-linear
dynamics in the incoming state, and without invoking any interaction in the
final state, we find that QCD interference alone can give rise to values for
$v_n\lbrace 2\rbrace$ and $v_n\lbrace 4\rbrace$, $n$ even, that persist
unattenuated for increasing number of sources, that may increase with
increasing multiplicity and that agree with measurements in proton-proton (pp)
collisions in terms of the order of magnitude of the signal and the approximate
shape of the transverse momentum dependence. We further find that the
non-abelian features of QCD interference can give rise to odd harmonic
anisotropies. These findings indicate that the no-interaction baseline
including QCD interference effects can make a sizeable if not dominant
contribution to the measured $v_n$ coefficients in pp collisions. Prospects for
analyzing QCD interference contributions further and their possible relevance
for proton-nucleus and nucleus-nucleus collisions are discussed shortly.Comment: 49 pages, 15 figures, revised version to appear in JHE | Collectivity from interference | collectivity from interference | hadronic collisions interference affects states. interference searching manifestations collective dynamics. parton interference hadronic collisions parton parton powers interference fourth cumulant anisotropies invoking azimuthal asymmetry incoming invoking interference lbrace rbrace lbrace rbrace persist unattenuated multiplicity agree proton proton collisions approximate dependence. abelian interference harmonic anisotropies. interference sizeable collisions. prospects analyzing interference relevance proton nucleus nucleus nucleus collisions pages revised | non_dup | [] |
93958837 | 10.1007/JHEP12(2017)075 | We propose a Grand Unified Theory of Flavour, based on $SO(10)$ together with
a non-Abelian discrete group $S_4$, under which the unified three quark and
lepton 16-plets are unified into a single triplet $3'$. The model involves a
further discrete group $ \mathbb{Z}_4^R\times \mathbb{Z}_4^3$ which controls
the Higgs and flavon symmetry breaking sectors. The CSD2 flavon vacuum
alignment is discussed, along with the GUT breaking potential and the
doublet-triplet splitting, and proton decay is shown to be under control. The
Yukawa matrices are derived in detail, from renormalisable diagrams, and
neutrino masses emerge from the type I seesaw mechanism. A full numerical fit
is performed with 15 input parameters generating 19 presently constrained
observables, taking into account supersymmetry threshold corrections. The model
predicts a normal neutrino mass ordering with a CP oscillation phase of
$260^{\circ}$, an atmospheric angle in the first octant and neutrinoless double
beta decay with $m_{\beta \beta}= 11$ meV. We discuss $N_2$ leptogenesis, which
fixes the second right-handed neutrino mass to be $M_2\simeq 2\times 10^{11}$
GeV, in the natural range predicted by the model.Comment: 26 pages, 10 figure | $\mathbf{SO(10)}\times \mathbf{S_4} $ Grand Unified Theory of Flavour
and Leptogenesis | $\mathbf{so(10)}\times \mathbf{s_4} $ grand unified theory of flavour and leptogenesis | propose grand unified flavour abelian unified lepton plets unified triplet involves mathbb mathbb flavon breaking sectors. flavon alignment breaking doublet triplet splitting proton control. yukawa renormalisable diagrams emerge seesaw mechanism. generating presently constrained observables supersymmetry corrections. predicts ordering oscillation circ octant neutrinoless beta beta beta mev. leptogenesis fixes handed simeq pages | non_dup | [] |
93957732 | 10.1007/JHEP12(2017)076 | We consider the stringy interaction between two parallel stacks of D3 branes
placed at a separation. Each stack of D3 branes in a similar fashion carry an
electric flux and a magnetic flux with the two sharing no common field strength
index. The interaction amplitude has an imaginary part, giving rise to the
Schwinger-like pair production of open strings. We find a significantly
enhanced rate of this production when the two electric fluxes are almost
identical and the brane separation is on the order of string scale. This
enhancement will be largest if the two magnetic fluxes are opposite in
direction. This novel enhancement results from the interplay of the
non-perturbative Schwinger-type pair production due to the electric flux and
the stringy tachyon due to the magnetic flux, and may have realistic physical
applications.Comment: 12 pages, minor revision, typos corrected, two references added, to
appear in JHE | Magnetically-enhanced open string pair production | magnetically-enhanced open string pair production | stringy stacks branes placed separation. stack branes fashion carry sharing index. imaginary giving schwinger strings. fluxes brane scale. enhancement fluxes opposite direction. enhancement interplay perturbative schwinger stringy tachyon realistic pages minor revision typos corrected | non_dup | [] |
83835402 | 10.1007/JHEP12(2017)078 | We conjecture a formula for the Schur index of four-dimensional
$\mathcal{N}=2$ theories coupled to $(2,2)$ surface defects in terms of the
$2d$-$4d$ BPS spectrum in the Coulomb phase of the theory. The key ingredient
in our conjecture is a refined $2d$-$4d$ wall-crossing invariant, which we also
formulate. Our result intertwines recent conjectures expressing the
four-dimensional Schur index in terms of infrared BPS particles, with the
Cecotti-Vafa formula for limits of the elliptic genus in terms of
two-dimensional BPS solitons. We extend our discussion to framed $2d$-$4d$ BPS
states, and use this to demonstrate a general relationship between surface
defect indices and line defect indices. We illustrate our results in the
example of $SU(2)$ super Yang-Mills coupled to the $\mathbb{CP}^1$ sigma model
defect.Comment: 50 pages, 1 figur | Surface Defect Indices and 2d-4d BPS States | surface defect indices and 2d-4d bps states | conjecture schur mathcal defects coulomb theory. ingredient conjecture refined crossing formulate. intertwines conjectures expressing schur infrared cecotti vafa elliptic genus solitons. extend framed defect indices defect indices. illustrate super mills mathbb sigma pages figur | non_dup | [] |
93958842 | 10.1007/JHEP12(2017)079 | Standard textbooks will state that hydrodynamics requires near-equilibrium to
be applicable. Recently, however, out-of-equilibrium attractor solutions for
hydrodynamics have been found in kinetic theory and holography in systems with
a high degree of symmetry, suggesting the possibility of a genuine
out-of-equilibrium formulation of hydrodynamics. This work demonstrates that
attractor solutions also occur in non-conformal kinetic theory and spatially
non-homogeneous systems, potentially having important implications for the
interpretation of experimental data in heavy-ion and proton-proton collisions
and relativistic fluid dynamics as a whole.Comment: 13 pages, 2 figures; v2: minor changes (typos, etc.); v3: matches
published versio | Relativistic Hydrodynamic Attractors with Broken Symmetries:
Non-Conformal and Non-Homogeneous | relativistic hydrodynamic attractors with broken symmetries: non-conformal and non-homogeneous | textbooks hydrodynamics applicable. attractor hydrodynamics holography genuine formulation hydrodynamics. demonstrates attractor conformal spatially homogeneous potentially proton proton collisions relativistic pages minor typos etc. matches versio | non_dup | [] |
84327859 | 10.1007/JHEP12(2017)080 | In this article we analyze the contribution from intermediate spin-0 and
spin-2 resonances to the $\tau\to\nu \pi\pi\pi$ decay by means of a chiral
invariant Lagrangian incorporating these mesons. In particular, we study the
corresponding axial-vector form-factors. The advantage of this procedure with
respect to previous analyses is that it incorporates chiral (and isospin)
invariance and, hence, the partial conservation of the axial-vector current.
This ensures the recovery of the right low-energy limit, described by chiral
perturbation theory, and the transversality of the current in the chiral limit
at all energies. Furthermore, the meson form-factors are further improved by
requiring appropriate QCD high-energy conditions. We end up with a brief
discussion on its implementation in the Tauola Monte Carlo and the prospects
for future analyses of Belle's data.Comment: 32 pages, 13 figures. Extended discussion on the numerical importance
of the tensor and scalar resonances and the parametrization of the scalar
propagator. Version published in JHE | Refining the scalar and tensor contributions in $\tau\to
\pi\pi\pi\nu_\tau$ decays | refining the scalar and tensor contributions in $\tau\to \pi\pi\pi\nu_\tau$ decays | analyze resonances chiral lagrangian incorporating mesons. axial factors. advantage incorporates chiral isospin invariance conservation axial current. ensures recovery chiral perturbation transversality chiral energies. meson requiring conditions. brief tauola monte carlo prospects belle pages figures. resonances parametrization propagator. | non_dup | [] |
83860116 | 10.1007/JHEP12(2017)081 | In this technical note we introduce a manifestly gauge-invariant and
supersymmetric procedure to regularize and renormalize one-loop divergences of
chiral multiplets in two-dimensional N=(2,2) theories in curved spacetime. We
apply the method, a version of Pauli-Villars regularization, to known examples
of supersymmetric localization and demonstrate that the partition functions are
renormalized. An accompanying ancillary file, a Mathematica notebook,
implements the relevant supergravity transformations.Comment: 19 pages, comes with a Mathematica notebook; version 2: counterterm
action slightly improved, comments and references added, typos correcte | Comments on supersymmetric renormalization in two-dimensional curved
spacetime | comments on supersymmetric renormalization in two-dimensional curved spacetime | manifestly supersymmetric regularize renormalize divergences chiral multiplets curved spacetime. pauli villars regularization supersymmetric localization partition renormalized. accompanying ancillary file mathematica notebook implements supergravity pages comes mathematica notebook counterterm comments typos correcte | non_dup | [] |
93940604 | 10.1007/JHEP12(2017)082 | We analyze neutrinoless double beta decay ($0\nu\beta\beta$) within the
framework of the Standard Model Effective Field Theory. Apart from the
dimension-five Weinberg operator, the first contributions appear at dimension
seven. We classify the operators and evolve them to the electroweak scale,
where we match them to effective dimension-six, -seven, and -nine operators. In
the next step, after renormalization group evolution to the QCD scale, we
construct the chiral Lagrangian arising from these operators. We develop a
power-counting scheme and derive the two-nucleon $0\nu\beta\beta$ currents up
to leading order in the power counting for each lepton-number-violating
operator. We argue that the leading-order contribution to the decay rate
depends on a relatively small number of nuclear matrix elements. We test our
power counting by comparing nuclear matrix elements obtained by various methods
and by different groups. We find that the power counting works well for nuclear
matrix elements calculated from a specific method, while, as in the case of
light Majorana neutrino exchange, the overall magnitude of the matrix elements
can differ by factors of two to three between methods. We calculate the
constraints that can be set on dimension-seven lepton-number-violating
operators from $0\nu\beta\beta$ experiments and study the interplay between
dimension-five and -seven operators, discussing how dimension-seven
contributions affect the interpretation of $0\nu\beta\beta$ in terms of the
effective Majorana mass $m_{\beta \beta}$.Comment: Matches version published in JHE | Neutrinoless double beta decay in chiral effective field theory: lepton
number violation at dimension seven | neutrinoless double beta decay in chiral effective field theory: lepton number violation at dimension seven | analyze neutrinoless beta beta beta theory. apart weinberg seven. classify evolve electroweak match seven nine operators. renormalization chiral lagrangian arising operators. counting derive nucleon beta beta currents counting lepton violating operator. argue elements. counting groups. counting majorana methods. seven lepton violating beta beta interplay seven discussing seven beta beta majorana beta beta .comment matches | non_dup | [] |
86417947 | 10.1007/JHEP12(2017)083 | Various alleged indirect dark matter search signals, such as the 511 keV line
from galaxy center or the PAMELA/AMS02 signal, are often challenged by the
absence of corresponding signal from dwarf galaxies and/or from the absence of
an impact on CMB through delayed recombination. We propose a novel scenario
that can avoid these bounds based on the decay of dark matter, X, to a pair of
intermediate particles C and \bar{C} with a lifetime much greater than the age
of universe. The annihilation of these intermediate particles eventually leads
to a dark matter signal. The bounds from CMB can be easily avoided by the fact
that at the time of recombination, not enough C particles had been accumulated.
In order to keep C particles from leaving the galaxy, we assume the particles
have a small electric charge so in the galactic disk, the magnetic field keeps
the C particles in the vicinity of their production. However, they can escape
the dwarf galaxies and the dark matter halo where the magnetic field is weak,
leading to null signal from these regions. The small charge can have
interesting consequences including a signal in direct dark matter searches.Comment: 10 pages, 1 figur | Pico-charged intermediate particles rescue dark matter interpretation of
511 keV signal | pico-charged intermediate particles rescue dark matter interpretation of 511 kev signal | alleged indirect pamela challenged dwarf delayed recombination. propose avoid bounds lifetime universe. annihilation eventually signal. bounds avoided recombination accumulated. keep leaving galactic keeps vicinity production. escape dwarf halo regions. consequences pages figur | non_dup | [] |
93956599 | 10.1007/JHEP12(2017)084 | Extended electroweak scalar sectors containing several doublet multiplets
require flavour-aligned Yukawa matrices to prevent the appearance at tree level
of unwanted flavour- changing neutral-current transitions. We analyse the
misalignment induced by one-loop quantum corrections and explore possible
generalizations of the alignment condition and their compatibility with current
experimental constraints. The hypothesis of flavour alignment at a high scale
turns out to be consistent with all known phenomenological tests.Comment: 35 pages, 8 figures. Version published at JHE | Flavour alignment in multi-Higgs-doublet models | flavour alignment in multi-higgs-doublet models | electroweak sectors doublet multiplets flavour aligned yukawa prevent appearance unwanted flavour changing neutral transitions. analyse misalignment explore generalizations alignment compatibility constraints. flavour alignment turns phenomenological pages figures. | non_dup | [] |
83863184 | 10.1007/JHEP12(2017)086 | The existence of a second Higgs doublet in Nature could lead to a
cosmological first order electroweak phase transition and explain the origin of
the matter-antimatter asymmetry in the Universe. We explore the parameter space
of such a two-Higgs-doublet-model and show that a first order electroweak phase
transition strongly correlates with a significant uplifting of the Higgs vacuum
w.r.t. its Standard Model value. We then obtain the spectrum and properties of
the new scalars $H_0$, $A_0$ and $H^{\pm}$ that signal such a phase transition,
showing that the decay $A_0 \rightarrow H_0 Z$ at the LHC and a sizable
deviation in the Higgs self-coupling $\lambda_{hhh}$ from its SM value are
sensitive indicators of a strongly first order electroweak phase transition in
the 2HDM | The Higgs Vacuum Uplifted: Revisiting the Electroweak Phase Transition
with a Second Higgs Doublet | the higgs vacuum uplifted: revisiting the electroweak phase transition with a second higgs doublet | doublet cosmological electroweak antimatter asymmetry universe. explore doublet electroweak correlates uplifting w.r.t. value. scalars rightarrow sizable lambda indicators electroweak | non_dup | [] |
86421145 | 10.1007/JHEP12(2017)087 | In the present work we study charged black hole solutions of the
Einstein-Maxwell action that have Thurston geometries on its near horizon
region. In particular we find solutions with charged Solv and Nil geometry
horizons. We also find Nil black holes with hyperscaling violation. For all our
solutions we compute the thermoelectric DC transport coefficients of the
corresponding dual field theory. We find that the Solv and Nil black holes
without hyperscaling violation are dual to metals while those with hyperscaling
violation are dual to insulators.Comment: 19 pages, 9 figures. v2: refs and details on computations added.
arXiv admin note: text overlap with arXiv:1503.01716 by other author | Thermoelectric Transport Coefficients from Charged Solv and Nil Black
Holes | thermoelectric transport coefficients from charged solv and nil black holes | einstein maxwell thurston geometries horizon region. solv horizons. holes hyperscaling violation. thermoelectric theory. solv holes hyperscaling violation metals hyperscaling violation pages figures. refs computations added. admin overlap | non_dup | [] |
83867807 | 10.1007/JHEP12(2017)089 | We propose an unconventional formulation of lattice field theories which is
quite general, although originally motivated by the quest of exact lattice
supersymmetry. Two long standing problems have a solution in this context: 1)
Each degree of freedom on the lattice corresponds to $2^d$ degrees of freedom
in the continuum, but all these doublers have (in the case of fermions) the
same chirality and can be either identified, thus removing the degeneracy, or,
in some theories with extended supersymmetry, identified with different members
of the same supermultiplet. 2) The derivative operator, defined on the lattice
as a suitable periodic function of the lattice momentum, is an addittive and
conserved quantity, thus assuring that the Leibnitz rule is satisfied. This
implies that the product of two fields on the lattice is replaced by a
non-local "star product" which is however in general non-associative.
Associativity of the "star product" poses strong restrictions on the form of
the lattice derivative operator (which becomes the inverse gudermannian
function of the lattice momentum) and has the consequence that the degrees of
freedom of the lattice theory and of the continuum theory are in one-to-one
correspondence, so that the two theories are eventually equivalent.
Regularization of the ultraviolet divergences on the lattice is not associated
to the lattice spacing, which does not act as a regulator, but may be obtained
by a one parameter deformation of the lattice derivative, thus preserving the
lattice structure even in the limit of infinite momentum cutoff. However this
regularization breaks gauge invariance and a gauge invariant regularization
within the lattice formulation is still lacking.Comment: 68 pages, 7 figure | An Alternative Lattice Field Theory Formulation Inspired by Lattice
Supersymmetry | an alternative lattice field theory formulation inspired by lattice supersymmetry | propose unconventional formulation originally motivated quest supersymmetry. standing freedom freedom continuum doublers fermions chirality removing degeneracy supersymmetry supermultiplet. addittive conserved quantity assuring leibnitz satisfied. replaced associative. associativity poses restrictions gudermannian freedom continuum correspondence eventually equivalent. regularization ultraviolet divergences spacing regulator deformation preserving infinite cutoff. regularization breaks invariance regularization formulation pages | non_dup | [] |
83852900 | 10.1007/JHEP12(2017)090 | We construct a diagrammatic coaction acting on one-loop Feynman graphs and
their cuts. The graphs are naturally identified with the corresponding (cut)
Feynman integrals in dimensional regularization, whose coefficients of the
Laurent expansion in the dimensional regulator are multiple polylogarithms
(MPLs). Our main result is the conjecture that this diagrammatic coaction
reproduces the combinatorics of the coaction on MPLs order by order in the
Laurent expansion. We show that our conjecture holds in a broad range of
nontrivial one-loop integrals. We then explore its consequences for the study
of discontinuities of Feynman integrals, and the differential equations that
they satisfy. In particular, using the diagrammatic coaction along with
information from cuts, we explicitly derive differential equations for any
one-loop Feynman integral. We also explain how to construct the symbol of any
one-loop Feynman integral recursively. Finally, we show that our diagrammatic
coaction follows, in the special case of one-loop integrals, from a more
general coaction proposed recently, which is constructed by pairing master
integrands with corresponding master contours.Comment: 76 pages. v2: Remarks added for clarification, typos corrected.
Supersedes published versio | Diagrammatic Hopf algebra of cut Feynman integrals: the one-loop case | diagrammatic hopf algebra of cut feynman integrals: the one-loop case | diagrammatic coaction acting feynman cuts. naturally feynman integrals regularization laurent regulator polylogarithms mpls conjecture diagrammatic coaction reproduces combinatorics coaction mpls laurent expansion. conjecture broad nontrivial integrals. explore consequences discontinuities feynman integrals satisfy. diagrammatic coaction cuts explicitly derive feynman integral. symbol feynman recursively. diagrammatic coaction integrals coaction pairing master integrands master pages. remarks clarification typos corrected. supersedes versio | non_dup | [] |
129348817 | 10.1007/JHEP12(2017)091 | We construct a solution of Heterotic supergravity which interpolates between
two different AdS$_{3}\times S^{3}\times T^{4}$ geometries corresponding to the
near-horizon limits of two 5-dimensional black holes, only one of which has
non-Abelian hair. This solution can be used to estimate the amplitude of
probability of the non-perturbative decay of the gauge 5-brane responsible for
the non-Abelian hair into eight solitonic 5-branes by evaluating its Euclidean
action. The Wick rotation of this solution poses several problems which we
argue can be overcome by using a non-extremal off-shell (NEOS) deformation of
the solution. This NEOS field configuration can be Wick rotated straight away
and its Euclidean action can be computed for any value of the deformation
parameter. The Euclidean result can then be anti-Wick-rotated and its extremal
limit gives the Euclidean action of the original solution, which turns out to
be one half of the difference between the entropies of the 5-dimensional black
holes.Comment: Few typos corrected. Two references and a footnote added. Version to
be published in JHE | Non-perturbative decay of Non-Abelian hair | non-perturbative decay of non-abelian hair | heterotic supergravity interpolates geometries horizon holes abelian hair. perturbative brane abelian hair eight solitonic branes evaluating euclidean action. wick poses argue overcome extremal neos deformation solution. neos wick rotated straight away euclidean deformation parameter. euclidean wick rotated extremal euclidean turns entropies typos corrected. footnote added. | non_dup | [] |
83846103 | 10.1007/JHEP12(2017)092 | We study a family of 5-dimensional non-Abelian black holes that can be
obtained by adding an instanton field to the well-known D1D5W Abelian black
holes. Naively, the non-Abelian fields seem to contribute to the black-hole
entropy but not to the mass due to their rapid fall-off at spatial infinity. By
uplifting the 5-dimensional supergravity solution to 10-dimensional Heterotic
Supergravity first and then dualizing it into a Type-I Supergravity solution,
we show that the non-Abelian fields are associated to D5-branes dissolved into
the D9-branes (dual to the Heterotic "gauge 5-branes") and that their
associated RR charge does not, in fact, contribute to the entropy, which only
depends on the number16 pages of D-strings and D5 branes and the momentum along
the D-strings, as in the Abelian case. These "dissolved" or "gauge" D5-branes
do contribute to the mass in the expected form. The correct interpretation of
the 5-dimensional charges in terms of the string-theory objects solves the
non-Abelian hair puzzle, allowing for the microscopic accounting of the
entropy. We discuss the validity of the solution when alpha prime corrections
are taken into account.Comment: Latex 2e file, 21 pages. A full appendix on alpha prime corrections
and the corresponding discussions have been added. The conclusions have
suffered minor changes. Version accepted in JHE | Non-Abelian black holes in string theory | non-abelian black holes in string theory | abelian holes adding instanton abelian holes. naively abelian seem fall infinity. uplifting supergravity heterotic supergravity dualizing supergravity abelian branes dissolved branes heterotic branes pages strings branes strings abelian case. dissolved branes form. charges solves abelian hair puzzle allowing microscopic accounting entropy. validity alpha prime latex file pages. alpha prime discussions added. suffered minor changes. | non_dup | [] |
83845233 | 10.1007/JHEP12(2017)093 | We study instanton corrections to four-point correlation correlation function
of half-BPS operators in $\mathcal N=4$ SYM in the light-cone limit when
operators become null separated in a sequential manner. We exploit the relation
between the correlation function in this limit and light-like rectangular
Wilson loop to determine the leading instanton contribution to the former from
the semiclassical result for the latter. We verify that the light-like
rectangular Wilson loop satisfies anomalous conformal Ward identities
nonperturbatively, in the presence of instantons. We then use these identities
to compute the leading instanton contribution to the light-like cusp anomalous
dimension and to anomalous dimension of twist-two operators with large spin.Comment: 27 page | Instanton effects in correlation functions on the light-cone | instanton effects in correlation functions on the light-cone | instanton mathcal cone separated sequential manner. exploit rectangular wilson instanton former semiclassical latter. verify rectangular wilson satisfies anomalous conformal ward identities nonperturbatively instantons. identities instanton cusp anomalous anomalous twist | non_dup | [] |
93941077 | 10.1007/JHEP12(2017)094 | Light pseudoscalars interacting pre-dominantly with Standard Model gauge
bosons (so-called axion-like particles or ALPs) occur frequently in extensions
of the Standard Model. In this work we review and update existing constraints
on ALPs in the keV to GeV mass region from colliders, beam dump experiments and
astrophysics. We furthermore provide a detailed calculation of the expected
sensitivity of Belle II, which can search for visibly and invisibly decaying
ALPs, as well as long-lived ALPs. The Belle II sensitivity is found to be
substantially better than previously estimated, covering wide ranges of
relevant parameter space. In particular, Belle II can explore an interesting
class of dark matter models, in which ALPs mediate the interactions between the
Standard Model and dark matter. In these models, the relic abundance can be set
via resonant freeze-out, leading to a highly predictive scenario consistent
with all existing constraints but testable with single-photon searches at Belle
II in the near future.Comment: 29 pages, 8 figures; v2: added discussion of heavy-ion collisions,
matches published version; data for exclusion limits provided as ancillary
file | Revised constraints and Belle II sensitivity for visible and invisible
axion-like particles | revised constraints and belle ii sensitivity for visible and invisible axion-like particles | pseudoscalars interacting dominantly bosons axion alps frequently extensions model. update alps colliders dump astrophysics. belle visibly invisibly decaying alps lived alps. belle substantially covering ranges space. belle explore alps mediate matter. relic abundance resonant freeze predictive testable searches belle pages collisions matches exclusion ancillary file | non_dup | [] |
84330102 | 10.1007/JHEP12(2017)095 | Motivated by the near-horizon geometry of four-dimensional extremal black
holes, we study a disordered quantum mechanical system invariant under a global
$SU(2)$ symmetry. As in the Sachdev-Ye-Kitaev model, this system exhibits an
approximate $SL(2,\mathbb{R})$ symmetry at low energies, but also allows for a
continuous family of $SU(2)$ breaking marginal deformations. Beyond a certain
critical value for the marginal coupling, the model exhibits a quantum phase
transition from the gapless phase to a gapped one and we calculate the critical
exponents of this transition. We also show that charged, rotating extremal
black holes exhibit a transition when the angular velocity of the horizon is
tuned to a certain critical value. Where possible we draw parallels between the
disordered quantum mechanics and charged, rotating black holes.Comment: 29 pages, 5 figure | Marginal Deformations and Rotating Horizons | marginal deformations and rotating horizons | motivated horizon extremal holes disordered symmetry. sachdev kitaev exhibits approximate mathbb breaking marginal deformations. marginal exhibits gapless gapped exponents transition. rotating extremal holes exhibit horizon tuned value. draw parallels disordered mechanics rotating pages | non_dup | [] |
83855820 | 10.1007/JHEP12(2017)096 | The mass and weak interaction eigenstates for the quarks of the third
generation are very well aligned, an empirical fact for which the Standard
Model offers no explanation. We explore the possibility that this alignment is
due to an additional gauge symmetry in the third generation. Specifically, we
construct and analyze an explicit, renormalizable model with a gauge boson,
$X$, corresponding to the $B-L$ symmetry of the third family. Having a
relatively light (in the MeV to multi-GeV range), flavor-nonuniversal gauge
boson results in a variety of constraints from different sources. By
systematically analyzing 20 different constraints, we identify the most
sensitive probes: kaon, $B^+$, $D^+$ and Upsilon decays, $D-\bar{D}^0$ mixing,
atomic parity violation, and neutrino scattering and oscillations. For the new
gauge coupling $g_X$ in the range $(10^{-2} - 10^{-4})$ the model is shown to
be consistent with the data. Possible ways of testing the model in $b$ physics,
top and $Z$ decays, direct collider production and neutrino oscillation
experiments, where one can observe nonstandard matter effects, are outlined.
The choice of leptons to carry the new force is ambiguous, resulting in
additional phenomenological implications, such as non-universality in
semileptonic bottom decays. The proposed framework provides interesting
connections between neutrino oscillations, flavor and collider physics.Comment: 44 pages, 7 figures, 3 tables; B physics constraints and references
added, conclusions unchange | Flavor Gauge Models Below the Fermi Scale | flavor gauge models below the fermi scale | eigenstates quarks aligned offers explanation. explore alignment generation. analyze renormalizable boson family. flavor nonuniversal boson sources. systematically analyzing probes kaon upsilon decays parity violation oscillations. data. ways decays collider oscillation nonstandard outlined. leptons carry ambiguous phenomenological universality semileptonic decays. connections oscillations flavor collider pages tables unchange | non_dup | [] |
129352202 | 10.1007/JHEP12(2017)097 | In this paper we investigate the extension of high energy resummation at LLx
accuracy to jet observables. In particular, we present the high energy resummed
expression of the transverse momentum distribution of the outgoing parton in
the general partonic process $g(q) + g(q) \to g(q) + X$. In order to reach this
result, several new ideas are introduced and exploited. First we prove that LLx
resummation is achieved by dressing with hard radiation an off-shell gluon
initiated LO process even if its on-shell limit is vanishing or trivial. Then
we present a gauge-invariant framework where these calculations can be
performed by using the modern helicity techniques. Finally, we show a possible
way to restore gluon indistinguishability in the final state, which is
otherwise lost in the resummation procedure, at all orders in $\alpha_s$ at
LLx. All partonic channels are then resummed and cross-checked against
fixed-order calculations up to $\mathcal{O}(\alpha_s^3)$Comment: 31 pages, 6 figure | High Energy Resummation of Jet Observables | high energy resummation of jet observables | resummation observables. resummed outgoing parton partonic ideas exploited. resummation dressing gluon initiated vanishing trivial. modern helicity techniques. restore gluon indistinguishability lost resummation orders alpha llx. partonic resummed checked mathcal alpha comment pages | non_dup | [] |
84329612 | 10.1007/JHEP12(2017)098 | We have studied how the equation of state of thermal QCD with two light
flavours is modified in strong magnetic field by calculating the thermodynamic
observables of hot QCD matter up to one-loop, where the magnetic field affects
mainly the quark contribution and the gluonic part is largely unaffected except
for the softening of the screening mass due to the strong magnetic field. To
begin with the effect of magnetic field on the thermodynamics, we have first
calculated the pressure of a thermal QCD medium in strong magnetic field limit
(SML), where the pressure at fixed temperature increases with the magnetic
field faster than the increase with the temperature at constant magnetic field.
This can be envisaged from the dominant scale of thermal medium in SML, which
is the magnetic field, like the temperature in thermal medium in absence of
strong magnetic field. Thus although the presence of strong magnetic field
makes the pressure of hot QCD medium harder but the increase of pressure with
respect to the temperature becomes less steeper. Corroborated to the above
observations, the entropy density is found to decrease with the temperature in
the ambience of strong magnetic field which resonates with the fact that the
strong magnetic field restricts the dynamics of quarks in two dimensions, hence
the phase space gets squeezed resulting the reduction of number of microstates.
Moreover the energy density is seen to decrease and the speed of sound of
thermal QCD medium is increased in the presence of strong magnetic field. These
crucial findings in strong magnetic field could have phenomenological
implications in heavy ion collisions because the expansion dynamics of the
medium produced in noncentral ultrarelativistic heavy ion collisions is
effectively controlled by both the energy density and the speed of sound.Comment: 42 pages, 6 figures and 2 diagram | One-loop QCD thermodynamics in a strong homogeneous and static magnetic
field | one-loop qcd thermodynamics in a strong homogeneous and static magnetic field | flavours calculating thermodynamic observables affects gluonic largely unaffected softening screening field. begin thermodynamics faster field. envisaged field. harder steeper. corroborated ambience resonates restricts quarks gets squeezed microstates. sound field. crucial phenomenological collisions noncentral ultrarelativistic collisions effectively pages | non_dup | [] |
86417948 | 10.1007/JHEP12(2017)100 | It has been recently shown that, contrary to an intuitive decoupling
argument, the presence of new physics at very large energy scales (say around
the Planck scale) can have a strong impact on the electroweak vacuum lifetime.
In particular, the vacuum could be totally destabilized. This study was
performed in a flat spacetime background, and it is important to extend the
analysis to curved spacetime since these are Planckian-physics effects. It is
generally expected that under these extreme conditions gravity should totally
quench the formation of true vacuum bubbles, thus washing out the destabilizing
effect of new physics. In this work we extend the analysis to curved spacetime
and show that, although gravity pushes toward stabilization, the destabilizing
effect of new physics is still (by far) the dominating one. In order to get
model independent results, high energy new physics is parametrized in two
different independent ways: as higher order operators in the Higgs field, or
introducing new particles with very large masses. The destabilizing effect is
observed in both cases, hinting at a general mechanism that does not depend on
the parametrization details for new physics, thus maintaining the results
obtained from the analysis performed in flat spacetime.Comment: 22 pages, 11 figure | Impact of New Physics on the EW vacuum stability in a curved spacetime
background | impact of new physics on the ew vacuum stability in a curved spacetime background | contrary intuitive decoupling argument planck electroweak lifetime. totally destabilized. spacetime extend curved spacetime planckian effects. extreme totally quench bubbles washing destabilizing physics. extend curved spacetime pushes toward stabilization destabilizing dominating one. parametrized ways introducing masses. destabilizing hinting parametrization maintaining pages | non_dup | [] |
129359577 | 10.1007/JHEP12(2017)101 | We construct a new solution of type IIB supergravity with eight supercharges
by applying non-Abelian T-duality to the $ AdS_5\times S^5$ solution, along the
$ SU(2)$ isometries in both the internal and Lorentz symmetries. The study of
quantised charges and D-brane embeddings suggests a configuration of D1 and
D3'-branes that polarise into concentric, spherical, D3 and D5-branes due to
the Myers dielectric effect. We find that our solution is dual to a IIB matrix
model with fuzzy sphere vacua characterised by partitions of the number of D1
and D3'-branes. We also study the solution obtained via (Abelian) T-dualities
along the $S^1$ fiber angles inside the $S^3$'s of the $ AdS_5\times S^5$
solution. In addition, we point out a precise relation between NATD and ATD
solutions by considering a double scaling limit in the NATD solutions. In the
particular case of the solutions obtained by a single (non-)Abelian T-duality
inside the Lorentz symmetries of the $AdS_5\times S^5$ solution, we demonstrate
that the double scaling limit provides a supergravity realisation of the
relations between the vacua of the half-BPS theories studied by Lin and
Maldacena.Comment: 20 pages, 1 figure, 1 tabl | A Type IIB Matrix Model via non-Abelian T-dualities | a type iib matrix model via non-abelian t-dualities | supergravity eight supercharges abelian duality isometries lorentz symmetries. quantised charges brane embeddings branes polarise concentric spherical branes myers dielectric effect. fuzzy sphere vacua characterised partitions branes. abelian dualities fiber angles solution. precise natd natd solutions. abelian duality lorentz symmetries supergravity realisation vacua pages tabl | non_dup | [] |
83850862 | 10.1007/JHEP12(2017)102 | Recent lattice studies of near-conformal strong dynamics suggest the
existence of a light scalar. This provides motivation to consider a simple
Hamiltonian-based bound-state model where the pseudoscalar, scalar, vector and
axial-vector states are treated on an equal footing. The model interpolates
between the non-relativistic limit and the highly relativistic chiral limit,
where the pseudoscalar mass drops to zero. The fermion mass becomes purely
dynamical at this point. When the gauge coupling is constant over a moderate
range of scales the scalar becomes significantly lighter than the spin 1 states
as the chiral limit is approached. We relate this result to the behavior of the
form factors of the respective states and their decay constants. In the
conformal limit of the model all masses vanish and the theory is characterized
by scaling dimensions.Comment: 14 pages, 8 figures, published versio | A bound state model for a light scalar | a bound state model for a light scalar | conformal scalar. motivation pseudoscalar axial footing. interpolates relativistic relativistic chiral pseudoscalar drops zero. fermion purely point. moderate lighter chiral approached. relate respective constants. conformal vanish pages versio | non_dup | [] |