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42751248 | 10.1007/JHEP11(2017)133 | We propose a strategy to study massive Quantum Field Theory (QFT) using
conformal bootstrap methods. The idea is to consider QFT in hyperbolic space
and study correlation functions of its boundary operators. We show that these
are solutions of the crossing equations in one lower dimension. By sending the
curvature radius of the background hyperbolic space to infinity we expect to
recover flat-space physics. We explain that this regime corresponds to large
scaling dimensions of the boundary operators, and discuss how to obtain the
flat-space scattering amplitudes from the corresponding limit of the boundary
correlators. We implement this strategy to obtain universal bounds on the
strength of cubic couplings in 2D flat-space QFTs using 1D conformal bootstrap
techniques. Our numerical results match precisely the analytic bounds obtained
in our companion paper using S-matrix bootstrap techniques.Comment: 25+21 pages, 14 figures; v2: minor correction | The S-matrix Bootstrap I: QFT in AdS | the s-matrix bootstrap i: qft in ads | propose massive conformal bootstrap methods. hyperbolic operators. crossing dimension. sending curvature hyperbolic infinity recover physics. amplitudes correlators. implement universal bounds cubic couplings qfts conformal bootstrap techniques. match precisely analytic bounds companion bootstrap pages minor | non_dup | [] |
84091526 | 10.1007/JHEP11(2017)134 | We describe global embeddings of fractional D3 branes at orientifolded
singularities in type IIB flux compactifications. We present an explicit
Calabi-Yau example where the chiral visible sector lives on a local
orientifolded quiver while non-perturbative effects, $\alpha'$ corrections and
a T-brane hidden sector lead to full closed string moduli stabilisation in a de
Sitter vacuum. The same model can also successfully give rise to inflation
driven by a del Pezzo divisor. Our model represents the first explicit
Calabi-Yau example featuring both an inflationary and a chiral visible sector.Comment: 33 pages, 8 figures and 3 tables; new inflationary plots and typos
corrected; references adde | Global Orientifolded Quivers with Inflation | global orientifolded quivers with inflation | embeddings fractional branes orientifolded singularities compactifications. calabi chiral visible lives orientifolded quiver perturbative alpha brane hidden moduli stabilisation sitter vacuum. successfully inflation pezzo divisor. calabi featuring inflationary chiral visible pages tables inflationary plots typos corrected adde | non_dup | [] |
93940358 | 10.1007/JHEP11(2017)135 | Given the Dirac neutrino mass term, we explore the constraint conditions
which allow the corresponding mass matrix to be invariant under the \mu-\tau
reflection transformation, leading us to the phenomenologically favored
predictions \theta_{23} = \pi/4 and \delta = 3\pi/2 in the standard
parametrization of the 3\times 3 lepton flavor mixing matrix. If such a flavor
symmetry is realized at a superhigh energy scale \Lambda_{\mu\tau}, we
investigate how it is spontaneously broken via the one-loop
renormalization-group equations (RGEs) running from \Lambda_{\mu\tau} down to
the Fermi scale \Lambda_{\rm F}. Such quantum corrections to the neutrino
masses and flavor mixing parameters are derived, and an analytical link is
established between the Jarlskog invariants of CP violation at
\Lambda_{\mu\tau} and \Lambda_{\rm F}. Some numerical examples are also
presented in both the minimal supersymmetric standard model and the type-II
two-Higgs-doublet model, to illustrate how the octant of \theta_{23}, the
quadrant of \delta and the neutrino mass ordering are correlated with one
another as a result of the RGE-induced \mu-\tau reflection symmetry breaking
effects.Comment: 21 pages, 4 figures, some changes made, 2HDM considered, accepted for
publication in JHE | The $\mu-\tau$ reflection symmetry of Dirac neutrinos and its breaking
effect via quantum corrections | the $\mu-\tau$ reflection symmetry of dirac neutrinos and its breaking effect via quantum corrections | dirac explore reflection phenomenologically favored theta delta parametrization lepton flavor matrix. flavor realized superhigh lambda spontaneously broken renormalization rges running lambda fermi lambda flavor jarlskog invariants violation lambda lambda supersymmetric doublet illustrate octant theta quadrant delta ordering reflection breaking pages publication | non_dup | [] |
84093016 | 10.1007/JHEP11(2017)136 | Motivated by discrete flavour symmetry models, we analyse Spontaneous CP
Violation (SCPV) for potentials involving three or six Higgs fields (both
electroweak doublets and singlets) which fall into irreducible triplet
representations of discrete symmetries belonging to the $\Delta(3n^2)$ and
$\Delta(6n^2)$ series, including $A_4$, $S_4$, $\Delta(27)$ and $\Delta(54)$.
For each case, we give the potential and find various global mimima for
different regions of the parameter space of the potential. Using CP-odd basis
Invariants that indicate the presence of Spontaneous CP Violation we separate
the VEVs into those that do or do not violate CP. In cases where CP is
preserved we reveal a CP symmetry of the potential that is preserved by those
VEVs, otherwise we display a non-zero CP-odd Invariant. Finally we identify
interesting cases where there is Spontaneous Geometrical CP Violation in which
the VEVs have calculable phases.Comment: 57 pages, 4 diagram | Spontaneous CP violation in multi-Higgs potentials with triplets of
$\Delta(3n^2)$ and $\Delta(6n^2)$ | spontaneous cp violation in multi-higgs potentials with triplets of $\delta(3n^2)$ and $\delta(6n^2)$ | motivated flavour analyse spontaneous violation scpv potentials involving electroweak doublets singlets fall irreducible triplet representations symmetries belonging delta delta delta delta mimima potential. invariants spontaneous violation vevs violate preserved reveal preserved vevs display invariant. spontaneous geometrical violation vevs calculable pages | non_dup | [] |
86415752 | 10.1007/JHEP11(2017)137 | We study half-BPS surface operators in supersymmetric gauge theories in four
and five dimensions following two different approaches. In the first approach
we analyze the chiral ring equations for certain quiver theories in two and
three dimensions, coupled respectively to four- and five-dimensional gauge
theories. The chiral ring equations, which arise from extremizing a twisted
chiral superpotential, are solved as power series in the infrared scales of the
quiver theories. In the second approach we use equivariant localization and
obtain the twisted chiral superpotential as a function of the Coulomb moduli of
the four- and five-dimensional gauge theories, and find a perfect match with
the results obtained from the chiral ring equations. In the five-dimensional
case this match is achieved after solving a number of subtleties in the
localization formulas which amounts to choosing a particular residue
prescription in the integrals that yield the Nekrasov-like partition functions
for ramified instantons. We also comment on the necessity of including
Chern-Simons terms in order to match the superpotentials obtained from dual
quiver descriptions of a given surface operator.Comment: 41 pages. v3: typos corrected in the text and in some formulae. Some
sentences rephrased according to the suggestions of the referee. Matches the
version published on JHE | Surface operators, chiral rings, and localization in N=2 gauge theories | surface operators, chiral rings, and localization in n=2 gauge theories | supersymmetric approaches. analyze chiral quiver theories. chiral arise extremizing twisted chiral superpotential solved infrared quiver theories. equivariant localization twisted chiral superpotential coulomb moduli perfect match chiral equations. match solving subtleties localization formulas amounts choosing residue prescription integrals nekrasov partition ramified instantons. comment necessity chern simons match superpotentials quiver descriptions pages. typos corrected formulae. sentences rephrased suggestions referee. matches | non_dup | [] |
93954491 | 10.1007/JHEP11(2017)138 | Rare $b \to s\ell^+\ell^-$ flavour-changing-neutral-current processes provide
important tests of the Standard Model of particle physics. Angular observables
in exclusive $b \to s\ell^+\ell^-$ processes can be particularly powerful as
they allow hadronic uncertainties to be controlled. Amongst the exclusive
processes that have been studied by experiments, the decay $\Lambda_b\to
\Lambda\ell^+\ell^-$ is unique in that the $\Lambda_b$ baryon can be produced
polarised. In this paper, we derive an expression for the angular distribution
of the $\Lambda_b\to \Lambda\ell^+\ell^-$ decay for the case where the
$\Lambda_b$ baryon is produced polarised. This extends the number of angular
observables in this decay from 10 to 34. Standard Model expectations for the
new observables are provided and the sensitivity of the observables is explored
under a variety of new physics models. At low-hadronic recoil, four of the new
observables have a new short distance dependence that is absent in the
unpolarised case. The remaining observables depend on the same short distance
contributions as the unpolarised observables, but with different dependence on
hadronic form-factors. These relations provide possibilities for novel tests of
the SM that could be carried out with the data that will become available at
the LHC or a future $e^+e^-$ collider | Angular distribution of polarised $\Lambda_b$ baryons decaying to
$\Lambda \ell^+\ell^-$ | angular distribution of polarised $\lambda_b$ baryons decaying to $\lambda \ell^+\ell^-$ | rare flavour changing neutral physics. observables exclusive powerful hadronic controlled. amongst exclusive lambda lambda lambda baryon polarised. derive lambda lambda lambda baryon polarised. extends observables expectations observables observables explored models. hadronic recoil observables absent unpolarised case. observables unpolarised observables hadronic factors. possibilities collider | non_dup | [] |
93939623 | 10.1007/JHEP11(2017)139 | We consider the low momentum expansion of the four graviton and the two
graviton--two gluon amplitudes in heterotic string theory at one loop in ten
dimensions, and analyze contributions upto the D^2 R^4 interaction from the
four graviton amplitude, and the D^4 R^2 F^2 interaction from the two
graviton--two gluon amplitude. The calculations are performed by obtaining
equations for the relevant modular graph functions that arise in the modular
invariant integrals, and involve amalgamating techniques used in the type II
theory and the calculation of the elliptic genus in the heterotic theory.Comment: 67 pages, LaTeX, 14 figure | Low momentum expansion of one loop amplitudes in heterotic string theory | low momentum expansion of one loop amplitudes in heterotic string theory | graviton graviton gluon amplitudes heterotic analyze upto graviton graviton gluon amplitude. obtaining modular arise modular integrals involve amalgamating elliptic genus heterotic pages latex | non_dup | [] |
73381793 | 10.1007/JHEP11(2017)140 | We analyze the classical and quantum vacua of 2d $\mathcal{N}=(8,8)$
supersymmetric Yang-Mills theory with $SU(N)$ and $U(N)$ gauge group,
describing the worldvolume interactions of $N$ parallel D1-branes with flat
transverse directions $\mathbb{R}^8$. We claim that the IR limit of the $SU(N)$
theory in the superselection sector labeled $M \pmod{N}$ --- identified with
the internal dynamics of $(M,N)$-string bound states of Type IIB string theory
--- is described by the symmetric orbifold $\mathcal{N}=(8,8)$ sigma model into
$(\mathbb{R}^8)^{D-1}/\mathbb{S}_D$ when $D=\gcd(M,N)>1$, and by a single
massive vacuum when $D=1$, generalizing the conjectures of E. Witten and
others. The full worldvolume theory of the D1-branes is the $U(N)$ theory with
an additional $U(1)$ 2-form gauge field $B$ coming from the string theory
Kalb-Ramond field. This $U(N)+B$ theory has generalized field configurations,
labeled by the $\mathbb{Z}$-valued generalized electric flux and an independent
$\mathbb{Z}_N$-valued 't Hooft flux. We argue that in the quantum mechanical
theory, the $(M,N)$-string sector with $M$ units of electric flux has a
$\mathbb{Z}_N$-valued discrete $\theta$ angle specified by $M \pmod{N}$ dual to
the 't Hooft flux. Adding the brane center-of-mass degrees of freedom to the
$SU(N)$ theory, we claim that the IR limit of the $U(N) + B$ theory in the
sector with $M$ bound F-strings is described by the $\mathcal{N}=(8,8)$ sigma
model into ${\rm Sym}^{D} ( \mathbb{R}^8)$. We provide strong evidence for
these claims by computing an $\mathcal{N}=(8,8)$ analog of the elliptic genus
of the UV gauge theories and of their conjectured IR limit sigma models, and
showing they agree. Agreement is established by noting that the elliptic genera
are modular-invariant Abelian (multi-periodic and meromorphic) functions, which
turns out to be very restrictive.Comment: 47 pages. Comments welcome | Quantum Vacua of 2d Maximally Supersymmetric Yang-Mills Theory | quantum vacua of 2d maximally supersymmetric yang-mills theory | analyze vacua mathcal supersymmetric mills describing worldvolume branes directions mathbb claim superselection labeled pmod orbifold mathcal sigma mathbb mathbb massive generalizing conjectures witten others. worldvolume branes coming kalb ramond field. configurations labeled mathbb valued mathbb valued hooft flux. argue mathbb valued theta specified pmod hooft flux. adding brane freedom claim strings mathcal sigma mathbb claims mathcal analog elliptic genus conjectured sigma agree. noting elliptic genera modular abelian meromorphic turns pages. comments welcome | non_dup | [] |
83836288 | 10.1007/JHEP11(2017)142 | Factorization theorems underly our ability to make predictions for many
processes involving the strong interaction. Although typically formulated at
leading power, the study of factorization at subleading power is of interest
both for improving the precision of calculations, as well as for understanding
the all orders structure of QCD. We use the SCET helicity operator formalism to
construct a complete power suppressed basis of hard scattering operators for
$e^+e^-\to$ dijets, $e^- p\to e^-$ jet, and constrained Drell-Yan, including
the first two subleading orders in the amplitude level power expansion. We
analyze the form of the hard, jet, and soft function contributions to the power
suppressed cross section for $e^+e^-\to$ dijet event shapes, and give results
for the lowest order matching to the contributing operators. These results will
be useful for studies of power corrections both in fixed order and resummed
perturbation theory.Comment: 110 pages, many figure | A Complete Basis of Helicity Operators for Subleading Factorization | a complete basis of helicity operators for subleading factorization | factorization theorems underly involving interaction. formulated factorization subleading improving precision orders qcd. scet helicity formalism suppressed dijets constrained drell subleading orders expansion. analyze suppressed dijet shapes matching contributing operators. resummed perturbation pages | non_dup | [] |
42751249 | 10.1007/JHEP11(2017)143 | We consider constraints on the S-matrix of any gapped, Lorentz invariant
quantum field theory in 1 + 1 dimensions due to crossing symmetry and
unitarity. In this way we establish rigorous bounds on the cubic couplings of a
given theory with a fixed mass spectrum. In special cases we identify
interesting integrable theories saturating these bounds. Our analytic bounds
match precisely with numerical bounds obtained in a companion paper where we
consider massive QFT in an AdS box and study boundary correlators using the
technology of the conformal bootstrap.Comment: 25+6 pages, 15 figures; v2: minor correction | The S-matrix Bootstrap II: Two Dimensional Amplitudes | the s-matrix bootstrap ii: two dimensional amplitudes | gapped lorentz crossing unitarity. establish rigorous bounds cubic couplings spectrum. integrable saturating bounds. analytic bounds match precisely bounds companion massive correlators conformal pages minor | non_dup | [] |
93939915 | 10.1007/JHEP11(2017)144 | In this note, we introduce and study a new class of "half integrands" in
Cachazo-He-Yuan (CHY) formula, which naturally generalize the so-called
Parke-Taylor factors; these are dubbed Cayley functions as each of them
corresponds to a labelled tree graph. The CHY formula with a Cayley function
squared gives a sum of Feynman diagrams, and we represent it by a combinatoric
polytope whose vertices correspond to Feynman diagrams. We provide a simple
graphic rule to derive the polytope from a labelled tree graph, and classify
such polytopes ranging from the associahedron to the permutohedron.
Furthermore, we study the linear space of such half integrands and find (1) a
nice formula reducing any Cayley function to a sum of Parke-Taylor factors in
the Kleiss-Kuijf basis (2) a set of Cayley functions as a new basis of the
space; each element has the remarkable property that its CHY formula with a
given Parke-Taylor factor gives either a single Feynman diagram or zero. We
also briefly discuss applications of Cayley functions and the new basis in
certain disk integrals of superstring theory.Comment: 30+8 pages, many figures;typos fixe | Labelled tree graphs, Feynman diagrams and disk integrals | labelled tree graphs, feynman diagrams and disk integrals | integrands cachazo yuan naturally generalize parke taylor dubbed cayley labelled graph. cayley squared feynman diagrams combinatoric polytope feynman diagrams. graphic derive polytope labelled classify polytopes ranging associahedron permutohedron. integrands nice reducing cayley parke taylor kleiss kuijf cayley remarkable parke taylor feynman zero. briefly cayley integrals superstring pages typos fixe | non_dup | [] |
93939452 | 10.1007/JHEP11(2017)145 | We develop a superfield approach to compute chiral anomalies in general
${\cal N}=(1,0)$ supersymmetric gauge theories in six dimensions. Within the
harmonic-superspace formulation for these gauge theories, the anomalous
contributions to the effective action only come from matter and ghost
hypermultiplets. By studying the short-distance behaviour of the propagator for
the hypermultiplet coupled to a background vector multiplet, we compute the
covariant and consistent chiral anomalies. We also provide a superform
formulation for the non-abelian anomalous current multiplet in general ${\cal
N}=(1,0)$ supersymmetric gauge theories.Comment: 33 page | Chiral anomalies in six dimensions from harmonic superspace | chiral anomalies in six dimensions from harmonic superspace | superfield chiral anomalies supersymmetric dimensions. harmonic superspace formulation anomalous come ghost hypermultiplets. studying propagator hypermultiplet multiplet covariant chiral anomalies. superform formulation abelian anomalous multiplet supersymmetric | non_dup | [] |
93940320 | 10.1007/JHEP11(2017)146 | We complete the four-dimensional ${\cal N}=1$ superfield description of
six-dimensional supergravity. The missing ingredients in the previous works are
the superfields that contain the sechsbein $e_4^{\;\;\underline{\nu}}$,
$e_5^{\;\;\underline{\nu}}$, $e_\mu^{\;\;\underline{4}}$,
$e_\mu^{\;\;\underline{5}}$ and the second gravitino. They are necessary to
make the action invariant under the diffeomorphisms and the Lorentz
transformations involving the extra dimensions. We find the corresponding
superfield transformation laws, and show the invariance of the action under
them. We also check that the resultant action reproduces the known superfield
description of five-dimensional supergravity through the dimensional reduction.Comment: 45 pages, some comments adde | Full diffeomorphism and Lorentz invariance in 4D ${\cal N}=1$ superfield
description of 6D SUGRA | full diffeomorphism and lorentz invariance in 4d ${\cal n}=1$ superfield description of 6d sugra | superfield supergravity. missing ingredients superfields sechsbein underline underline underline underline gravitino. diffeomorphisms lorentz transformations involving extra dimensions. superfield laws invariance them. check resultant reproduces superfield supergravity pages comments adde | non_dup | [] |
93941877 | 10.1007/JHEP11(2017)147 | We study the semileptonic and non-leptonic charmed baryon decays with $SU(3)$
flavor symmetry, where the charmed baryons can be ${\bf
B}_{c}=(\Xi_c^0,\Xi_c^+,\Lambda_c^+)$, ${\bf
B}'_{c}=(\Sigma_c^{(++,+,0)},\Xi_{c}^{\prime(+,0)},\Omega_c^0)$, ${\bf
B}_{cc}=(\Xi_{cc}^{++},\Xi_{cc}^+,\Omega_{cc}^+)$, or ${\bf
B}_{ccc}=\Omega^{++}_{ccc}$. With ${\bf B}_n^{(\prime)}$ denoted as the baryon
octet (decuplet), we find that the ${\bf B}_{c}\to {\bf B}'_n\ell^+\nu_\ell$
decays are forbidden, while the $\Omega_c^0\to \Omega^-\ell^+\nu_\ell$,
$\Omega_{cc}^+\to\Omega_c^0\ell^+\nu_\ell$, and $\Omega_{ccc}^{++}\to
\Omega_{cc}^+\ell^+\nu_\ell$ decays are the only existing Cabibbo-allowed modes
for ${\bf B}'_{c}\to {\bf B}'_n\ell^+\nu_\ell$, ${\bf B}_{cc}\to {\bf
B}'_c\ell^+\nu_\ell$, and ${\bf B}_{ccc}\to {\bf
B}_{cc}^{(\prime)}\ell^+\nu_\ell$, respectively. We predict the rarely studied
${\bf B}_{c}\to {\bf B}_n^{(\prime)}M$ decays, such as ${\cal
B}(\Xi_c^0\to\Lambda^0\bar K^0,\,\Xi_c^+\to\Xi^0\pi^+)=(8.3\pm 0.9,8.0\pm
4.1)\times 10^{-3}$ and ${\cal B}(\Lambda_c^+\to
\Delta^{++}\pi^-,\,\Xi_c^0\to\Omega^- K^+)=(5.5\pm 1.3,4.8\pm 0.5)\times
10^{-3}$. For the observation, the doubly and triply charmed baryon decays of
$\Omega_{cc}^{+}\to \Xi_c^+\bar K^0$, $\Xi_{cc}^{++}\to (\Xi_c^+\pi^+$,
$\Sigma_c^{++}\bar K^0)$, and $\Omega_{ccc}^{++}\to (\Xi_{cc}^{++}\bar
K^0,\Omega_{cc}^+\pi^+,\Xi_c^+ D^+)$ are the favored Cabibbo-allowed decays,
which are accessible to the BESIII and LHCb experiments.Comment: 29 pages, no figure, a typo in the table correcte | Charmed Baryon Weak Decays with SU(3) Flavor Symmetry | charmed baryon weak decays with su(3) flavor symmetry | semileptonic leptonic charmed baryon decays flavor charmed baryons lambda sigma prime omega omega omega prime denoted baryon octet decuplet decays forbidden omega omega omega omega omega omega decays cabibbo prime respectively. predict rarely prime decays lambda lambda delta omega doubly triply charmed baryon decays omega sigma omega omega favored cabibbo decays accessible besiii lhcb pages typo correcte | non_dup | [] |
83855962 | 10.1007/JHEP11(2017)148 | In this paper we apply the discrete gravity and Regge calculus to tensor
networks and Anti-de Sitter/conformal field theory (AdS/CFT) correspondence. We
construct the boundary many-body quantum state $|\Psi\rangle$ using random
tensor networks as the holographic mapping, applied to the Wheeler-deWitt wave
function of bulk Euclidean discrete gravity in 3 dimensions. The entanglement
R\'enyi entropy of $|\Psi\rangle$ is shown to holographically relate to the
on-shell action of Einstein gravity on a branch cover bulk manifold. The
resulting R\'enyi entropy $S_n$ of $|\Psi\rangle$ approximates with high
precision the R\'enyi entropy of ground state in 2-dimensional conformal field
theory (CFT). In particular it reproduces the correct $n$ dependence. Our
results develop the framework of realizing the AdS$_3$/CFT$_2$ correspondence
on random tensor networks, and provide a new proposal to approximate CFT ground
state.Comment: 8+2 pages, 10 figures, presentation improved, references adde | Discrete Gravity on Random Tensor Network and Holographic R\'enyi
Entropy | discrete gravity on random tensor network and holographic r\'enyi entropy | regge calculus sitter conformal correspondence. rangle holographic wheeler dewitt euclidean dimensions. entanglement enyi rangle holographically relate einstein branch cover manifold. enyi rangle approximates precision enyi conformal reproduces dependence. realizing correspondence proposal approximate pages presentation adde | non_dup | [] |
86414843 | 10.1007/JHEP11(2017)149 | The eigenstate thermalization hypothesis (ETH) explains how closed unitary
quantum systems can exhibit thermal behavior in pure states. In this work we
examine a recently proposed microscopic model of a black hole in AdS$_2$, the
so-called Sachdev-Ye-Kitaev (SYK) model. We show that this model satisfies the
eigenstate thermalization hypothesis by solving the system in exact
diagonalization. Using these results we also study the behavior, in
eigenstates, of various measures of thermalization and scrambling of
information. We establish that two-point functions in finite-energy eigenstates
approximate closely their thermal counterparts and that information is
scrambled in individual eigenstates. We study both the eigenstates of a single
random realization of the model, as well as the model obtained after averaging
of the random disordered couplings. We use our results to comment on the
implications for thermal states of the dual theory, i.e. the AdS$_2$ black
hole.Comment: 36 pages, many figures; references added; matches published versio | Eigenstate thermalization in the Sachdev-Ye-Kitaev model | eigenstate thermalization in the sachdev-ye-kitaev model | eigenstate thermalization explains unitary exhibit states. examine microscopic sachdev kitaev model. satisfies eigenstate thermalization solving diagonalization. eigenstates thermalization scrambling information. establish eigenstates approximate closely counterparts scrambled eigenstates. eigenstates realization averaging disordered couplings. comment i.e. pages matches versio | non_dup | [] |
86419735 | 10.1007/JHEP11(2017)150 | In this paper we present a next-to-next-to-leading order (NNLO) QCD
calculation of the processes $pp\rightarrow l^+l^-\gamma$ and $pp\rightarrow
\nu\bar\nu\gamma$ that we have implemented in MCFM. Our calculation includes
QCD corrections at NNLO both for the Standard Model (SM) and additionally in
the presence of $Z\gamma\gamma$ and $ZZ\gamma$ anomalous couplings. We compare
our implementation, obtained using the jettiness slicing approach, with a
previous SM calculation and find broad agreement. Focusing on the sensitivity
of our results to the slicing parameter, we show that using our setup we are
able to compute NNLO cross sections with numerical uncertainties of about
$0.1\%$, which is small compared to residual scale uncertainties of a few
percent. We study potential improvements using two different jettiness
definitions and the inclusion of power corrections. At $\sqrt{s}=13$ TeV we
present phenomenological results and consider $Z\gamma$ as a background to
$H\to Z\gamma$ production. We find that, with typical cuts, the inclusion of
NNLO corrections represents a small effect and loosens the extraction of limits
on anomalous couplings by about $10\%$.Comment: 30 pages, 14 figure | $Z\gamma$ production at NNLO including anomalous couplings | $z\gamma$ production at nnlo including anomalous couplings | nnlo rightarrow gamma rightarrow gamma implemented mcfm. nnlo additionally gamma gamma gamma anomalous couplings. jettiness slicing broad agreement. focusing slicing setup nnlo residual percent. improvements jettiness definitions inclusion corrections. sqrt phenomenological gamma gamma production. cuts inclusion nnlo loosens extraction anomalous couplings .comment pages | non_dup | [] |
93940593 | 10.1007/JHEP11(2017)151 | The two-dimensional QCD in the large $N$ limit, generally referred to as the
't Hooft model, is numerically investigated in the axial gauge in a
comprehensive manner. The corresponding Bethe-Salpeter equation for a bound
$q\bar{q}$ pair, originally derived by Bars and Green in 1978, was first
numerically tackled by Li and collaborators in late 1980s, yet only for the
{\it stationary} mesons. In this paper, we make further progress by numerically
solving the Bars-Green equation for {\it moving} mesons, ranging from the
chiral pion to charmonium. By choosing several different quark masses, we
computed the corresponding quark condensates, meson spectra and their decay
constants for a variety of meson momenta, and found satisfactory agreement with
their counterparts obtained using light-cone gauge, thus numerically verified
the gauge and Poincar\'{e} invariance of the 't Hooft model. Moreover, we have
explicitly confirmed that, as the meson gets more and more boosted, the large
component of the Bars-Green wave function indeed approaches the corresponding
't Hooft light-cone wave function, while the small component of the wave
function rapidly fades away.Comment: v2, 25 pages, 12 figures, and 1 table; Some figures updated,
references added, typo corrrected; to appear in JHE | Solving the Bars-Green equation for moving mesons in two-dimensional QCD | solving the bars-green equation for moving mesons in two-dimensional qcd | referred hooft numerically axial comprehensive manner. bethe salpeter originally numerically tackled collaborators stationary mesons. progress numerically solving moving mesons ranging chiral pion charmonium. choosing condensates meson meson momenta satisfactory counterparts cone numerically verified poincar invariance hooft model. explicitly confirmed meson gets boosted hooft cone rapidly fades pages updated typo corrrected | non_dup | [] |
86420103 | 10.1007/JHEP11(2017)152 | We consider known examples of non-supersymmetric AdS$_7$ and AdS$_4$
solutions arising from compactifications of massive type IIA supergravity and
study their stability, taking into account the coupling between closed- and
open-string sector excitations. Generically, open strings are found to develop
modes with masses below the Breitenlohner-Freedman (BF) bound. We comment on
the relation with the Weak Gravity Conjecture, and how this analysis may play
an important role in examining the validity of non-supersymmetric constructions
in string theory.Comment: 26 pages and 8 table | A swamp of non-SUSY vacua | a swamp of non-susy vacua | supersymmetric arising compactifications massive supergravity excitations. generically strings breitenlohner freedman bound. comment conjecture examining validity supersymmetric constructions pages | non_dup | [] |
83843636 | 10.1007/JHEP11(2017)154 | We study the gravitational action induced by coupling two-dimensional
non-conformal, massive matter to gravity on a Riemann surface with boundaries.
A small-mass expansion gives back the Liouville action in the massless limit,
while the first-order mass correction allows us to identify what should be the
appropriate generalization of the Mabuchi action on a Riemann surface with
boundaries. We provide a detailed study for the example of the cylinder.
Contrary to the case of manifolds without boundary, we find that the
gravitational Lagrangian explicitly depends on the space-point, via the
geodesic distances to the boundaries, as well as on the modular parameter of
the cylinder, through an elliptic theta-function.Comment: 33 page | 2D gravitational Mabuchi action on Riemann surfaces with boundaries | 2d gravitational mabuchi action on riemann surfaces with boundaries | gravitational conformal massive riemann boundaries. liouville massless generalization mabuchi riemann boundaries. cylinder. contrary manifolds gravitational lagrangian explicitly geodesic distances boundaries modular cylinder elliptic theta | non_dup | [] |
93941052 | 10.1007/JHEP11(2017)155 | Kinematic space can be used as an intermediate step in the AdS/CFT dictionary
and lends itself naturally to the description of diffeomorphism invariant
quantities. From the bulk it has been defined as the space of boundary anchored
geodesics, and from the boundary as the space of pairs of CFT points. When the
bulk is not globally AdS$_3$ the appearance of non-minimal geodesics leads to
ambiguities in these definitions. In this work conical defect spacetimes are
considered as an example where non-minimal geodesics are common. From the bulk
it is found that the conical defect kinematic space can be obtained from the
AdS$_3$ kinematic space by the same quotient under which one obtains the defect
from AdS$_3$. The resulting kinematic space is one of many equivalent
fundamental regions. From the boundary the conical defect kinematic space can
be determined by breaking up OPE blocks into contributions from individual bulk
geodesics. A duality is established between partial OPE blocks and bulk fields
integrated over individual geodesics, minimal or non-minimal.Comment: 29 pages, 9 figures. As published in JHE | Kinematic space for conical defects | kinematic space for conical defects | kinematic dictionary lends naturally diffeomorphism quantities. anchored geodesics points. globally appearance geodesics ambiguities definitions. conical defect spacetimes geodesics common. conical defect kinematic kinematic quotient obtains defect kinematic regions. conical defect kinematic breaking blocks geodesics. duality blocks geodesics pages figures. | non_dup | [] |
83867514 | 10.1007/JHEP11(2017)157 | Quantum quenches in continuum field theory across critical points are known
to display different scaling behaviours in different regimes of the quench
rate. We extend these results to integrable lattice models such as the
transverse field Ising model on a one-dimensional chain and the Kitaev model on
a two-dimensional honeycomb lattice using a nonlinear quench protocol which
allows for exact analytical solutions of the dynamics. Our quench protocol
starts with a finite mass gap at early times and crosses a critical point or a
critical region, and we study the behaviour of one point functions of the
quenched operator at the critical point or in the critical region as a function
of the quench rate. For quench rates slow compared to the initial mass gap, we
find the expected Kibble-Zurek scaling. In contrast, for rates fast compared to
the mass gap, but slow compared to the inverse lattice spacing, we find scaling
behaviour similar to smooth fast continuum quenches. For quench rates of the
same order of the lattice scale, the one point function saturates as a function
of the rate, approaching the results of an abrupt quench. The presence of an
extended critical surface in the Kitaev model leads to a variety of scaling
exponents depending on the starting point and on the time where the operator is
measured. We discuss the role of the amplitude of the quench in determining the
extent of the slow (Kibble-Zurek) and fast quench regimes, and the onset of the
saturation.Comment: 54 pages, 13 figures; v2: added analytic argument for Kitaev mode | An exactly solvable quench protocol for integrable spin models | an exactly solvable quench protocol for integrable spin models | quenches continuum display behaviours regimes quench rate. extend integrable ising kitaev honeycomb quench dynamics. quench starts crosses quenched quench rate. quench slow kibble zurek scaling. slow spacing continuum quenches. quench saturates approaching abrupt quench. kitaev exponents measured. quench determining slow kibble zurek quench regimes onset pages analytic argument kitaev | non_dup | [] |
93940619 | 10.1007/JHEP11(2017)158 | We present a detailed phenomenological study of the next-to-next-to-leading
order (NNLO) QCD corrections for $t$-channel single top (anti-)quark production
and its semi-leptonic decay at the CERN Large Hadron Collider (LHC). We find
the NNLO corrections for the total inclusive rates at the LHC with different
center of mass energies are generally smaller than the NLO corrections,
indicative of improved convergence. However, they can be large for differential
distributions, reaching a level of $10\%$ or more in certain regions of the
transverse momentum distributions of the top (anti-)quark and the
pseudo-rapidity distributions of the leading jet in the event. In all cases the
perturbative hard scale uncertainties are greatly reduced after the NNLO
corrections are included. We also show a comparison of the normalized
parton-level distributions to recent data from the 8 TeV measurement of the
ATLAS Collaboration. The NNLO corrections tend to shift the theoretical
predictions closer to the measured transverse momentum distribution of the top
(anti)-quark. Importantly, for the LHC at 13 TeV, we present NNLO cross
sections in a fiducial volume with decays of the top quark included.Comment: minor changes, published versio | Differential Distributions for t-channel Single Top-Quark Production and
Decay at Next-to-Next-to-Leading Order in QCD | differential distributions for t-channel single top-quark production and decay at next-to-next-to-leading order in qcd | phenomenological nnlo leptonic cern hadron collider nnlo inclusive indicative convergence. reaching pseudo rapidity event. perturbative greatly nnlo included. parton atlas collaboration. nnlo tend closer quark. importantly nnlo fiducial decays minor versio | non_dup | [] |
93940463 | 10.1007/JHEP11(2017)160 | In marked contrast to conventional string theory, ambitwistor strings remain
solvable worldsheet theories when coupled to curved background fields. We use
this fact to consider the quantization of ambitwistor strings on plane wave
metric and plane wave gauge field backgrounds. In each case, the worldsheet
model is anomaly free as a consequence of the background satisfying the field
equations. We derive vertex operators (in both fixed and descended picture
numbers) for gravitons and gluons on these backgrounds from the worldsheet CFT,
and study the 3-point functions of these vertex operators on the Riemann
sphere. These worldsheet correlation functions reproduce the known results for
3-point scattering amplitudes of gravitons and gluons in gravitational and
gauge theoretic plane wave backgrounds, respectively.Comment: 29 pages, 1 figure. v2: added discussion, published versio | Amplitudes on plane waves from ambitwistor strings | amplitudes on plane waves from ambitwistor strings | marked ambitwistor strings solvable worldsheet curved fields. quantization ambitwistor strings backgrounds. worldsheet anomaly satisfying equations. derive descended picture gravitons gluons backgrounds worldsheet riemann sphere. worldsheet reproduce amplitudes gravitons gluons gravitational theoretic backgrounds pages figure. versio | non_dup | [] |
83843933 | 10.1007/JHEP11(2017)161 | The pre-equilibrium evolution of a quark-gluon plasma produced in a heavy-ion
collision is studied in the framework of kinetic theory. We discuss the
approach to local thermal equilibrium, and the onset of hydrodynamics, in terms
of a particular set of moments of the distribution function. These moments
quantify the momentum anisotropies to a finer degree than the commonly used
ratio of longitudinal to transverse pressures. They are found to be in direct
correspondence with viscous corrections of hydrodynamics, and provide therefore
an alternative measure of these corrections in terms of the distortion of the
momentum distribution. As an application, we study the evolution of these
moments by solving the Boltzmann equation for a boost invariant expanding
system, first analytically in the relaxation time approximation, and then
numerically for a quark-gluon plasma within the small angle approximation to
the collision kernel.Comment: updated version, with corrected discussion | Onset of hydrodynamics for a quark-gluon plasma from the evolution of
moments of distribution functions | onset of hydrodynamics for a quark-gluon plasma from the evolution of moments of distribution functions | gluon collision theory. onset hydrodynamics moments function. moments quantify anisotropies finer commonly longitudinal pressures. correspondence viscous hydrodynamics distortion distribution. moments solving boltzmann boost expanding analytically relaxation numerically gluon collision updated corrected | non_dup | [] |
93957654 | 10.1007/JHEP11(2017)162 | Supersymmetric theories supplemented by an underlying flavor-symmetry
$\mathcal{G}_f$ provide a rich playground for model building aimed at
explaining the flavor structure of the Standard Model. In the case where
supersymmetry breaking is mediated by gravity, the soft-breaking Lagrangian
typically exhibits large tree-level flavor violating effects, even if it stems
from an ultraviolet flavor-conserving origin. Building on previous work, we
continue our phenomenological analysis of these models with a particular
emphasis on leptonic flavor observables. We consider three representative
models which aim to explain the flavor structure of the lepton sector, with
symmetry groups $\mathcal{G}_f = \Delta(27)$, $A_4,$ and $S_3$.Comment: References added, minor typos corrected. 28 pages, 8 figure | Slepton Non-Universality in the Flavor-Effective MSSM | slepton non-universality in the flavor-effective mssm | supersymmetric supplemented flavor mathcal playground aimed explaining flavor model. supersymmetry breaking breaking lagrangian exhibits flavor violating stems ultraviolet flavor conserving origin. continue phenomenological emphasis leptonic flavor observables. flavor lepton mathcal delta .comment minor typos corrected. pages | non_dup | [] |
93942156 | 10.1007/JHEP11(2017)163 | New particles beyond the Standard Model might be produced with a very high
boost, for instance if they result from the decay of a heavier particle. If the
former decay hadronically, then their signature is a single massive fat jet
which is difficult to separate from QCD backgrounds. Jet substructure and
machine learning techniques allow for the discrimination of many specific
boosted objects from QCD, but the scope of possibilities is very large, and a
suite of dedicated taggers may not be able to cover every possibility - in
addition to making experimental searches cumbersome. In this paper we describe
a generic model-independent tagger that is able to discriminate a wide variety
of hadronic boosted objects from QCD jets using N-subjettiness variables, with
a significance improvement varying between 2 and 8. This is in addition to any
improvement that might come from a cut on jet mass. Such a tagger can be used
in model-independent searches for new physics yielding fat jets. We also show
how such a tagger can be applied to signatures over a wide range of jet masses
without sculpting the background distributions, allowing to search for new
physics as bumps on jet mass distributions.Comment: Main text: 19 page | A generic anti-QCD jet tagger | a generic anti-qcd jet tagger | boost heavier particle. former hadronically signature massive backgrounds. substructure machine discrimination boosted scope possibilities suite dedicated taggers cover searches cumbersome. generic tagger discriminate hadronic boosted jets subjettiness come mass. tagger searches yielding jets. tagger signatures sculpting allowing bumps | non_dup | [] |
93939196 | 10.1007/JHEP11(2017)165 | We investigate a holographic version of Maxwell's equal area law analogous to
that for the phase transition in the black hole temperature/black hole entropy
plane of a charged AdS black hole. We consider proposed area laws for both the
black hole temperature/holographic entanglement entropy plane and the black
hole temperature/2-point correlation function plane. Despite recent claims to
the contrary, we demonstrate numerically that neither proposal is valid. We
argue that there is no physical reason to expect such a construction in these
planes.Comment: 17 pages, 8 figures. v2: Added appendix and discussio | Breakdown of the Equal Area Law for Holographic Entanglement Entropy | breakdown of the equal area law for holographic entanglement entropy | holographic maxwell analogous hole. laws holographic entanglement plane. claims contrary numerically neither proposal valid. argue pages figures. discussio | non_dup | [] |
93953169 | 10.1007/JHEP11(2017)166 | We consider the Bremsstrahlung function associated to a 1/6-BPS Wilson loop
in ABJM theory, with a cusp in the couplings to scalar fields. We non-trivially
extend its recent four-loop computation at weak coupling to include non-planar
corrections. We have recently proposed a conjecture relating this object to
supersymmetric circular Wilson loops with multiple windings, which can be
computed via localization. We find agreement between this proposal and the
perturbative computation of the Bremsstrahlung function, including color
sub-leading corrections. This supports the conjecture and hints at its validity
beyond the planar approximation.Comment: 22 page | ABJM $\theta$-Bremsstrahlung at four loops and beyond: non-planar
corrections | abjm $\theta$-bremsstrahlung at four loops and beyond: non-planar corrections | bremsstrahlung wilson abjm cusp couplings fields. trivially extend planar corrections. conjecture relating supersymmetric circular wilson loops windings localization. proposal perturbative bremsstrahlung corrections. supports conjecture hints validity planar | non_dup | [] |
93942818 | 10.1007/JHEP11(2017)167 | We discuss the constraints that a conformal field theory should enjoy to
admit exactly marginal deformations, i.e. to be part of a conformal manifold.
In particular, using tools from conformal perturbation theory, we derive a sum
rule from which one can extract restrictions on the spectrum of low spin
operators and on the behavior of OPE coefficients involving nearly marginal
operators. We then consider conformal field theories admitting a gravity dual
description, and as such a large-$N$ expansion. We discuss the relation between
conformal perturbation theory and loop expansion in the bulk, and show how such
connection could help in the search for conformal manifolds beyond the planar
limit. Our results do not rely on supersymmetry, and therefore apply also
outside the realm of superconformal field theories.Comment: 30 pages, figures. v3: discussion on contribution of graviton
exchange extended + minor correction | On non-supersymmetric conformal manifolds: field theory and holography | on non-supersymmetric conformal manifolds: field theory and holography | conformal enjoy admit marginal deformations i.e. conformal manifold. conformal perturbation derive extract restrictions involving nearly marginal operators. conformal admitting expansion. conformal perturbation connection conformal manifolds planar limit. rely supersymmetry realm superconformal pages figures. graviton minor | non_dup | [] |
83840761 | 10.1007/JHEP11(2017)168 | Large gauge symmetries in Minkowski spacetime are often studied in two
distinct regimes: either at asymptotic (past or future) times or at spatial
infinity. By working in harmonic gauge, we provide a unified description of
large gauge symmetries (and their associated charges) that applies to both
regimes. At spatial infinity the charges are conserved and interpolate between
those defined at the asymptotic past and future. This explains the equality of
asymptotic past and future charges, as recently proposed in connection with
Weinberg's soft photon theorem.Comment: 23 page | Asymptotic $U(1)$ charges at spatial infinity | asymptotic $u(1)$ charges at spatial infinity | symmetries minkowski spacetime regimes asymptotic infinity. harmonic unified symmetries charges applies regimes. infinity charges conserved interpolate asymptotic future. explains equality asymptotic charges connection weinberg | non_dup | [] |
93937444 | 10.1007/JHEP11(2017)169 | There are two alternative approaches to the minimal gravity - direct
Liouville approach and matrix models. Recently there has been a certain
progress in the matrix model approach, growing out of presence of a Frobenius
manifold (FM) structure embedded in the theory. The previous studies were
mainly focused on the spherical topology. Essentially, it was shown that the
action principle of Douglas equation allows to define the free energy and to
compute the correlation numbers if the resonance transformations are properly
incorporated. The FM structure allows to find the explicit form of the
resonance transformation as well as the closed expression for the partition
function. In this paper we elaborate on the case of gravitating disk. We focus
on the bulk correlators and show that in the similar way as in the closed
topology the generating function can be formulated using the set of flat
coordinates on the corresponding FM. Moreover, the resonance transformations,
which follow from the spherical topology consideration, are exactly those
needed to reproduce FZZ result of the Liouville gravity approach | Minimal gravity and Frobenius manifolds: bulk correlation on sphere and
disk | minimal gravity and frobenius manifolds: bulk correlation on sphere and disk | liouville models. progress growing frobenius manifold embedded theory. focused spherical topology. essentially douglas transformations properly incorporated. partition function. elaborate gravitating disk. correlators topology generating formulated transformations spherical topology consideration reproduce liouville | non_dup | [] |
154257953 | 10.1007/JHEP11(2017)170 | A measurement is presented of decay-time-dependent CP violation in the decays $B^0 \to J/\psi K^0_S$ and $B^0 \to \psi(2S) K^0_S$, where the $J/\psi$ is reconstructed from two electrons and the $\psi(2S)$ from two muons. The analysis uses a sample of pp collision data recorded with the LHCb experiment at centre-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3 $fb^{−1}$. The CP -violation observables are measured to be\ud
$C(B^0 \to J/\psi K^0_S) = 0.12 \pm 0.07 \pm 0.02,$\ud
$S(B^0 \to J/\psi K^0_S) = 0.83 \pm 0.08 \pm 0.01,$\ud
$C(B^0 \to \psi(2S) K^0_S) = −0.05 \pm 0.10 \pm 0.01,$\ud
$S(B^0 \to \psi(2S) K^0_S) = 0.84 \pm 0.10 \pm 0.01,$\ud
where C describes CP violation in the direct decay, and S describes CP violation in the interference between the amplitudes for the direct decay and for the decay after $B^0 − \overline{B}^0$ oscillation. The first uncertainties are statistical and the second are systematic. The two sets of results are compatible with the previous LHCb measurement using $B^0 \to J/\psi K^0_S$ decays, where the $J/ψ$ meson was reconstructed from two muons. The averages of all three sets of LHCb results are\ud
$C(B^0 \to [c\overline{c}]K^0_S) = −0.017 \pm 0.029,$\ud
$S(B^0 \to [c\overline{c}]K^0_S) = 0.760 \pm 0.034,$\ud
under the assumption that higher-order contributions to the decay amplitudes are negligible. The uncertainties include statistical and systematic contributions | Measurement of CP violation in $B^0 \to J/\psi K^0_S$ and $B^0 \to \psi(2S) K^0_S$ decays | measurement of cp violation in $b^0 \to j/\psi k^0_s$ and $b^0 \to \psi(2s) k^0_s$ decays | violation decays reconstructed muons. collision lhcb luminosity violation observables describes violation describes violation interference amplitudes overline oscillation. systematic. compatible lhcb decays meson reconstructed muons. averages lhcb overline overline amplitudes negligible. | non_dup | [] |
93936771 | 10.1007/JHEP11(2017)172 | Quantization of closed string proceeds with a suitable choice of worldsheet
vacuum. A priori, the vacuum may be chosen independently for left-moving and
right-moving sectors. We construct {\sl ab initio} quantized bosonic string
theory with left-right asymmetric worldsheet vacuum and explore its
consequences and implications. We critically examine the validity of new vacuum
and carry out first-quantization using standard operator formalism. Remarkably,
the string spectrum consists only of a finite number of degrees of freedom:
string gravity (massless spin-two, Kalb-Ramond and dilaton fields) and two
massive spin-two Fierz-Pauli fields. The massive spin-two fields have negative
norm, opposite mass-squared, and provides a Lee-Wick type extension of string
gravity. We compute two physical observables: tree-level scattering amplitudes
and one-loop cosmological constant. Scattering amplitude of four dilatons is
shown to be a rational function of kinematic invariants, and in $D=26$
factorizes into contributions of massless spin-two and a pair of massive
spin-two fields. The string one loop partition function is shown to perfectly
agree with one loop Feynman diagram of string gravity and two massive spin-two
fields. In particular, it does not exhibit modular invariance. We critically
compare our construction with recent studies and contrast differences.Comment: 42 pages, 1 figure, minor corrections, references added; v3: minor
corrections, references added, published version in JHE | A String Theory Which Isn't About Strings | a string theory which isn't about strings | quantization proceeds worldsheet vacuum. priori independently moving moving sectors. initio quantized bosonic asymmetric worldsheet explore consequences implications. critically examine validity carry quantization formalism. remarkably freedom massless kalb ramond dilaton massive fierz pauli fields. massive norm opposite squared wick gravity. observables amplitudes cosmological constant. dilatons rational kinematic invariants factorizes massless massive fields. partition perfectly agree feynman massive fields. exhibit modular invariance. critically pages minor minor | non_dup | [] |
93942158 | 10.1007/JHEP11(2017)173 | In ABJ(M) theory a generalized cusp can be constructed out of the 1/6 BPS
Wilson line by introducing an angle $\varphi$ in the spacial contour and/or an
angle $\theta$ in the internal R-symmetry space. The small angles limits of its
anomalous dimension are controlled by corresponding Bremsstrahlung functions.
In this note we compute the internal space $\theta$-Bremsstrahlung function to
four loops at weak coupling in the planar limit. Based on this result, we
propose an all order conjecture for the $\theta$-Bremsstrahlung function.Comment: 40 pages; v2: references added, JHEP published extended versio | ABJM $\theta$-Bremsstrahlung at four loops and beyond | abjm $\theta$-bremsstrahlung at four loops and beyond | cusp wilson introducing varphi spacial contour theta space. angles anomalous bremsstrahlung functions. theta bremsstrahlung loops planar limit. propose conjecture theta bremsstrahlung pages jhep versio | non_dup | [] |
93945041 | 10.1007/JHEP11(2017)174 | We construct new families of 1/4 BPS Wilson loops in circular quiver
$\mathcal N=4$ superconformal Chern-Simons-matter (SCSM) theories in three
dimensions. They are defined as the holonomy of superconnections that contain
non-trivial couplings to scalar and fermions, and cannot be reduced to
block-diagonal matrices. Consequently, the new operators cannot be written in
terms of double-node Wilson loops, as the ones considered so far in the
literature. For particular values of the couplings the superconnection becomes
block-diagonal and we recover the known fermionic 1/4 and 1/2 BPS Wilson loops.
The new operators are cohomologically equivalent to bosonic 1/4 BPS Wilson
loops and are then amenable of exact evaluation via localization techniques.
Moreover, in the case of orbifold ABJM theory we identify the corresponding
gravity duals for some of the 1/4 and 1/2 BPS Wilson loops.Comment: 32 pages; v2: minor improvements, general classification of BPS WLs
added; v3: comments added, typos fixed, JHEP published versio | New BPS Wilson loops in $\mathcal N \textbf{= 4}$ circular quiver
Chern-Simons-matter theories | new bps wilson loops in $\mathcal n \textbf{= 4}$ circular quiver chern-simons-matter theories | families wilson loops circular quiver mathcal superconformal chern simons scsm dimensions. holonomy superconnections trivial couplings fermions diagonal matrices. wilson loops literature. couplings superconnection diagonal recover fermionic wilson loops. cohomologically bosonic wilson loops amenable localization techniques. orbifold abjm duals wilson pages minor improvements comments typos jhep versio | non_dup | [] |
84092488 | 10.1007/JHEP11(2017)175 | We formulate a kinematical extension of Double Field Theory on a
$2d$-dimensional para-Hermitian manifold $(\mathcal{P},\eta,\omega)$ where the
$O(d,d)$ metric $\eta$ is supplemented by an almost symplectic two-form
$\omega$. Together $\eta$ and $\omega$ define an almost bi-Lagrangian structure
$K$ which provides a splitting of the tangent bundle
$T\mathcal{P}=L\oplus\tilde{L}$ into two Lagrangian subspaces. In this paper a
canonical connection and a corresponding generalised Lie derivative for the
Leibniz algebroid on $T\mathcal{P}$ are constructed. We find integrability
conditions under which the symmetry algebra closes for general $\eta$ and
$\omega$, even if they are not flat and constant. This formalism thus provides
a generalisation of the kinematical structure of Double Field Theory. We also
show that this formalism allows one to reconcile and unify Double Field Theory
with Generalised Geometry which is thoroughly discussed.Comment: 41 pages, v2: typos corrected, references added, published versio | Generalised Kinematics for Double Field Theory | generalised kinematics for double field theory | formulate kinematical para hermitian manifold mathcal omega supplemented symplectic omega omega lagrangian splitting tangent bundle mathcal oplus tilde lagrangian subspaces. canonical connection generalised leibniz algebroid mathcal constructed. integrability closes omega constant. formalism generalisation kinematical theory. formalism reconcile unify generalised thoroughly pages typos corrected versio | non_dup | [] |
86421284 | 10.1007/JHEP11(2017)176 | A method to directly determine the Wilson coefficients for rare $b\to s$
transitions using $B^0\to K^{*0}\mu^+\mu^-$ decays in an unbinned maximum
likelihood fit is presented. The method has several advantages compared to the
conventional determination of the Wilson coefficients from angular observables
that are determined in bins of $q^2$, the square of the mass of the dimuon
system. The method uses all experimental information in an optimal way and
automatically accounts for experimental correlations. Performing
pseudoexperiments, we show the improved sensitivity of the proposed method for
the Wilson coefficients. We also demonstrate that it will be possible to use
the method with the combined Run 1 and 2 data sample taken by the LHCb
experiment.Comment: 36 pages, 8 figures; v2: Negligible changes in numerics, references
added, matches published versio | Direct determination of Wilson coefficients using $B^0\to
K^{*0}\mu^+\mu^-$ decays | direct determination of wilson coefficients using $b^0\to k^{*0}\mu^+\mu^-$ decays | wilson rare decays unbinned likelihood presented. advantages wilson observables bins dimuon system. automatically accounts correlations. performing pseudoexperiments wilson coefficients. lhcb pages negligible numerics matches versio | non_dup | [] |
129347956 | 10.1007/JHEP11(2017)177 | String theory provides us with 8d supersymmetric gauge theory with gauge
algebras $\mathfrak{su}(N)$, $\mathfrak{so}(2N)$, $\mathfrak{sp}(N)$,
$\mathfrak{e}_{6}$, $\mathfrak{e}_{7}$ and $\mathfrak{e}_{8}$, but no
construction for $\mathfrak{so}(2N{+}1)$, $\mathfrak{f}_4$ and $\mathfrak{g}_2$
is known. In this paper, we show that the theories for $\mathfrak{f}_4$ and
$\mathfrak{so}(2N{+}1)$ have a global gauge anomaly associated to $\pi_{d=8}$,
while $\mathfrak{g}_2$ does not have it. We argue that the anomaly associated
to $\pi_d$ in $d$-dimensional gauge theories cannot be canceled by topological
degrees of freedom in general. We also show that the theories for
$\mathfrak{sp}(N)$ have a subtler gauge anomaly, which we suggest should be
canceled by a topological analogue of the Green-Schwarz mechanism.Comment: 27 page | 8d gauge anomalies and the topological Green-Schwarz mechanism | 8d gauge anomalies and the topological green-schwarz mechanism | supersymmetric algebras mathfrak mathfrak mathfrak mathfrak mathfrak mathfrak mathfrak mathfrak mathfrak known. mathfrak mathfrak anomaly mathfrak argue anomaly canceled topological freedom general. mathfrak subtler anomaly canceled topological analogue schwarz | non_dup | [] |
84328237 | 10.1007/JHEP11(2017)178 | We propose a way to define and compute invariants of general smooth
4-manifolds based on topological twists of non-Lagrangian 4d N=2 and N=3
theories in which the problem is reduced to a fairly standard computation in
topological A-model, albeit with rather unusual targets, such as compact and
non-compact Gepner models, asymmetric orbifolds, N=(2,2) linear dilaton
theories, "self-mirror" geometries, varieties with complex multiplication, etc.Comment: 49 pages, 8 figures, 8 tables, v2: a reference adde | Trisecting non-Lagrangian theories | trisecting non-lagrangian theories | propose invariants manifolds topological twists lagrangian fairly topological albeit unusual targets gepner asymmetric orbifolds dilaton mirror geometries varieties multiplication pages tables adde | non_dup | [] |
86421430 | 10.1007/JHEP11(2017)179 | Motivated by recent constructions of TeV-scale strongly-coupled dynamics,
either associated with the Higgs sector itself as in pseudo-Nambu-Goldstone
boson (pNGB) Higgs models or in theories of asymmetric dark matter, we show
that stable solitonic Q- balls can be formed from light pion-like pNGB fields
carrying a conserved global quantum number in the presence of the Higgs field.
We focus on the case of thick-wall Q-balls, where solutions satisfying all
constraints are shown to exist over a range of parameter values. In the limit
that our approximations hold, the Q-balls are weakly bound and parametrically
large, and the form of the interactions of the light physical Higgs with the
Q-ball is determined by the breaking of scale symmetry.Comment: 24 pages, 6 figures, 1 tabl | Higgs Assisted Q-balls from Pseudo-Nambu-Goldstone Bosons | higgs assisted q-balls from pseudo-nambu-goldstone bosons | motivated constructions pseudo nambu goldstone boson pngb asymmetric solitonic balls pion pngb carrying conserved field. thick balls satisfying values. approximations hold balls weakly parametrically ball breaking pages tabl | non_dup | [] |
93949870 | 10.1007/JHEP11(2017)180 | We study the SYK model with complex fermions, in the presence of an
all-to-all $q$-body interaction, with a non-vanishing chemical potential. We
find that, in the large $q$ limit, this model can be solved exactly and the
corresponding Lyapunov exponent can be obtained semi-analytically. The
resulting Lyapunov exponent is a sensitive function of the chemical potential
$\mu$. Even when the coupling $J$, which corresponds to the disorder averaged
values of the all to all fermion interaction, is large, values of $\mu$ which
are exponentially small compared to $J$ lead to suppression of the Lyapunov
exponent.Comment: 18pages, 4 figures, v2:references and acknowledgment added, typos
correcte | SYK Model, Chaos and Conserved Charge | syk model, chaos and conserved charge | fermions vanishing potential. solved lyapunov exponent analytically. lyapunov exponent disorder averaged fermion exponentially suppression lyapunov pages acknowledgment typos correcte | non_dup | [] |
93945612 | 10.1007/JHEP11(2017)182 | We present a formalism for a fully coherent QED parton shower. The complete
multipole structure of photonic radiation is incorporated in a single branching
kernel. The regular on-shell 2 to 3 kinematic picture is kept intact by
dividing the radiative phase space into sectors, allowing for a definition of
the ordering variable that is similar to QCD antenna showers. A modified
version of the Sudakov veto algorithm is discussed that increases performance
at the cost of the introduction of weighted events. Due to the absence of a
soft singularity, the formalism for photon splitting is very similar to the QCD
analogon of gluon splitting. However, since no color structure is available to
guide the selection of a spectator, a weighted selection procedure from all
available spectators is introduced.Comment: 33 pages, 12 figures. Added subsection 4.3 and some comments and
references per reviewer request. Version accepted by JHE | Final-state QED Multipole Radiation in Antenna Parton Showers | final-state qed multipole radiation in antenna parton showers | formalism coherent parton shower. multipole photonic incorporated branching kernel. kinematic picture kept intact dividing radiative sectors allowing ordering antenna showers. sudakov veto weighted events. singularity formalism splitting analogon gluon splitting. guide spectator weighted spectators pages figures. subsection comments reviewer request. | non_dup | [] |
83870512 | 10.1007/JHEP11(2017)183 | We derive a universal formula for the average heavy-heavy-light structure
constants for 2d CFTs with non-vanishing u(1) charge. The derivation utilizes
the modular properties of one-point functions on the torus. Refinements in N=2
SCFTs, show that the resulting Cardy-like formula for the structure constants
has precisely the same shifts in the central charge as that of the
thermodynamic entropy found earlier. This analysis generalizes the recent
results by Kraus and Maloney for CFTs with an additional global u(1) symmetry.
Our results at large central charge are also shown to match with computations
from the holographic dual, which suggest that the averaged CFT three-point
coefficient also serves as an useful probe of detecting black hole hair.Comment: 22 pages, 1 figure; v2: approximates published versio | Charged structure constants from modularity | charged structure constants from modularity | derive universal cfts vanishing charge. derivation utilizes modular torus. refinements scfts cardy precisely shifts thermodynamic earlier. generalizes kraus maloney cfts symmetry. match computations holographic averaged serves detecting pages approximates versio | non_dup | [] |
86419459 | 10.1007/JHEP11(2017)184 | We discuss a number of strategies to reduce the $\mathcal B(B^0_s \to
\ell^{+} \ell^{-} \gamma)$ theoretical error, and make such a measurement a new
probe of the interactions that are interesting in the light of present-day
flavor discrepancies. In particular, for low di-lepton invariant mass we
propose to exploit the close parenthood between $\mathcal B(B^0_s \to \ell^{+}
\ell^{-} \gamma)$ and the measured $\mathcal B(B^0_s \to \phi (\to K^+ K^-)
\gamma)$. For high $q^2$, conversely, we exploit the fact that the decay is
dominated by two form-factor combinations, plus contributions from broad
charmonium that we model accordingly. We construct the ratio $R_\gamma$, akin
to $R_K$ and likewise sensitive to lepton-universality violation. Provided the
two rates in this ratio are integrated in a suitable region that minimises
bremsstrahlung contributions while maximising statistics, the ratio is very
close to unity and the form-factor dependence cancels to an extent that makes
it a new valuable probe of lepton-universality violating contributions in the
effective Hamiltonian. We finally speculate on additional ideas to extract
short-distance information from resonance regions, which are theoretically
interesting but statistically limited at present.Comment: 21 pages, 4 figures. v4: in appendix removed equation already present
in main tex | $B^0_s \to \ell^+ \ell^- \gamma$ as a Test of Lepton Flavor Universality | $b^0_s \to \ell^+ \ell^- \gamma$ as a test of lepton flavor universality | mathcal gamma flavor discrepancies. lepton propose exploit parenthood mathcal gamma mathcal gamma conversely exploit dominated combinations broad charmonium accordingly. gamma akin likewise lepton universality violation. minimises bremsstrahlung maximising unity cancels valuable lepton universality violating hamiltonian. speculate ideas extract theoretically statistically pages figures. removed | non_dup | [] |
93950290 | 10.1007/JHEP11(2017)185 | We consider the transverse momentum dependent gluon distribution functions
(called gluon TMDs) by studying the light-front gluon-gluon correlator,
extending the results for unpolarized and vector polarized targets to also
include tensor polarized targets -- the latter type of polarization is relevant
for targets of spin $\ge1$. The light-front correlator includes
process-dependent gauge links to guarantee color gauge invariance. As from the
experimental side the gluon TMDs are largely unknown, we present positivity
bounds for combinations of leading-twist gluon distributions that may be used
to estimate their maximal contribution to observables. Since the gluonic
content of hadrons is particularly relevant in the small-$x$ kinematic region,
we also study these bounds in the small-$x$ limit for the dipole-type gauge
link structure using matrix elements of a single Wilson loop.Comment: 10 page | Positivity bounds on gluon TMDs for hadrons of spin $\le$ 1 | positivity bounds on gluon tmds for hadrons of spin $\le$ 1 | gluon gluon tmds studying front gluon gluon correlator extending unpolarized polarized targets polarized targets targets front correlator links guarantee invariance. gluon tmds largely unknown positivity bounds combinations twist gluon maximal observables. gluonic hadrons kinematic bounds dipole wilson | non_dup | [] |
86420108 | 10.1007/JHEP11(2017)186 | We show that large $N$ phases of a $0$ dimensional generic unitary matrix
model (UMM) can be described in terms of topologies of two dimensional droplets
on a plane spanned by eigenvalue and number of boxes in Young diagram.
Information about different phases of UMM is encoded in the geometry of
droplets. These droplets are similar to phase space distributions of a unitary
matrix quantum mechanics (UMQM) ($(0 + 1)$ dimensional) on constant time
slices. We find that for a given UMM, it is possible to construct an effective
UMQM such that its phase space distributions match with droplets of UMM on
different time slices at large $N$. Therefore, large $N$ phase transitions in
UMM can be understood in terms of dynamics of an effective UMQM. From the
geometry of droplets it is also possible to construct Young diagrams
corresponding to $U(N)$ representations and hence different large $N$ states of
the theory in momentum space. We explicitly consider two examples : single
plaquette model with $\text{Tr} U^2$ terms and Chern-Simons theory on $S^3$. We
describe phases of CS theory in terms of eigenvalue distributions of unitary
matrices and find dominant Young distributions for them.Comment: 52 pages, 15 figures, v2 Introduction and discussions extended,
References adde | Emergent Phase Space Description of Unitary Matrix Model | emergent phase space description of unitary matrix model | generic unitary topologies droplets spanned eigenvalue boxes diagram. encoded droplets. droplets unitary mechanics umqm slices. umqm match droplets slices understood umqm. droplets diagrams representations space. explicitly plaquette chern simons eigenvalue unitary pages discussions adde | non_dup | [] |
93941062 | 10.1007/JHEP11(2017)187 | We construct firstly the complete list of five quantum deformations of $D=4$
complex homogeneous orthogonal Lie algebra $\mathfrak{o}(4;\mathbb{C})\cong
\mathfrak{o}(3;\mathbb{C})\oplus \mathfrak{o}(3;\mathbb{C})$, describing
quantum rotational symmetry of four-dimensional complex space-time, in
particular we provide the corresponding universal quantum $R$-matrices. Further
applying four possible reality conditions we obtain all sixteen Hopf-algebraic
quantum deformations for the real forms of $\mathfrak{o}(4;\mathbb{C})$:
Euclidean $\mathfrak{o}(4)$, Lorentz $\mathfrak{o}(3,1)$, Kleinian
$\mathfrak{o}(2,2)$ and quaternionic $\mathfrak{o}^{\star}(4)$. For
$\mathfrak{o}(3,1)$ we only recall well-known results obtained previously by
the authors, but for other real Lie algebras (Euclidean, Kleinian,
quaternionic) as well as for the complex Lie algebra
$\mathfrak{o}(4;\mathbb{C})$ we present new results.Comment: 32 pages, v2 minor improvements, added references, new formulas on
p.2 | Basic quantizations of $D=4$ Euclidean, Lorentz, Kleinian and
quaternionic $\mathfrak{o}^{\star}(4)$ symmetries | basic quantizations of $d=4$ euclidean, lorentz, kleinian and quaternionic $\mathfrak{o}^{\star}(4)$ symmetries | firstly deformations homogeneous orthogonal mathfrak mathbb cong mathfrak mathbb oplus mathfrak mathbb describing rotational universal matrices. reality sixteen hopf algebraic deformations mathfrak mathbb euclidean mathfrak lorentz mathfrak kleinian mathfrak quaternionic mathfrak mathfrak algebras euclidean kleinian quaternionic mathfrak mathbb pages minor improvements formulas | non_dup | [] |
93953261 | 10.1007/JHEP11(2017)188 | We evaluate the full time dependence of holographic complexity in various
eternal black hole backgrounds using both the complexity=action (CA) and the
complexity=volume (CV) conjectures. We conclude using the CV conjecture that
the rate of change of complexity is a monotonically increasing function of
time, which saturates from below to a positive constant in the late time limit.
Using the CA conjecture for uncharged black holes, the holographic complexity
remains constant for an initial period, then briefly decreases but quickly
begins to increase. As observed previously, at late times, the rate of growth
of the complexity approaches a constant, which may be associated with Lloyd's
bound on the rate of computation. However, we find that this late time limit is
approached from above, thus violating the bound. Adding a charge to the eternal
black holes washes out the early time behaviour, i.e., complexity immediately
begins increasing with sufficient charge, but the late time behaviour is
essentially the same as in the neutral case. We also evaluate the complexity of
formation for charged black holes and find that it is divergent for extremal
black holes, implying that the states at finite chemical potential and zero
temperature are infinitely more complex than their finite temperature
counterparts.Comment: 52+31 pages, 30 figure | On the Time Dependence of Holographic Complexity | on the time dependence of holographic complexity | holographic eternal backgrounds conjectures. conjecture monotonically saturates limit. conjecture uncharged holes holographic briefly quickly begins increase. lloyd computation. approached violating bound. adding eternal holes washes i.e. immediately begins essentially neutral case. holes divergent extremal holes implying infinitely pages | non_dup | [] |
93959134 | 10.1007/JHEP11(2017)189 | We discuss effective models derived from a supersymmetric model whose
mediation mechanism of supersymmetry (SUSY) breaking is namely mirage
mediation. In this model, light higgsino mass, that is required by the natural
realization of the electroweak scale, is achieved by the unification of the
soft SUSY breaking parameters at the low scale. Besides, we find that extra
Higgs fields are also possibly light in some cases. Then, the effective model
is a two Higgs doublet model (2HDM) with higgsinos, and it is distinguishable
with namely type-II 2HDM which is widely discussed. In this paper, we study the
mass spectrum of SUSY particles and the extra Higgs fields, and summarize the
phenomenology in the effective model. We survey the current experimental bounds
from the LHC and the dark matter experiments as well as the flavor physics.
Then, we point out the expected mass scale of the SUSY particles and reveal the
future prospects for the direct and indirect searches. We also discuss the
difference between our effective model and the 2HDM in the bottom-up approach.Comment: 22 pages, 3 figures and 1 tabl | Analysis of the TeV-scale mirage mediation with heavy superparticles | analysis of the tev-scale mirage mediation with heavy superparticles | supersymmetric mediation supersymmetry susy breaking mirage mediation. higgsino realization electroweak unification susy breaking scale. besides extra possibly cases. doublet higgsinos distinguishable widely discussed. susy extra summarize phenomenology model. bounds flavor physics. susy reveal prospects indirect searches. pages tabl | non_dup | [] |
73369221 | 10.1007/JHEP11(2017)192 | We continue the discussion of the decorated on-shell diagrammatics for planar
N < 4 Supersymmetric Yang-Mills theories started in arXiv:1510.03642. In
particular, we focus on its relation with the structure of varieties on the
Grassmannian. The decoration of the on-shell diagrams, which physically keeps
tracks of the helicity of the coherent states propagating along their edges,
defines new on-shell functions on the Grassmannian and can introduce novel
higher-order singularities, which graphically are reflected into the presence
of helicity loops in the diagrams. These new structures turn out to have
similar features as in the non-planar case: the related higher-codimension
varieties are identified by either the vanishing of one (or more) Plucker
coordinates involving at least two non-adjacent columns, or new relations among
Plucker coordinates. A distinctive feature is that the functions living on
these higher-codimenson varieties can be thought of distributionally as having
support on derivative delta-functions. After a general discussion, we explore
in some detail the structures of the on-shell functions on Gr(2,4) and Gr(3,6)
on which the residue theorem allows to obtain a plethora of identities among
them.Comment: 34 pages, 65 figure | On-shell diagrams and the geometry of planar N < 4 SYM theories | on-shell diagrams and the geometry of planar n < 4 sym theories | continue decorated diagrammatics planar supersymmetric mills started varieties grassmannian. decoration diagrams physically keeps tracks helicity coherent propagating defines grassmannian singularities graphically reflected helicity loops diagrams. planar codimension varieties vanishing plucker involving adjacent columns plucker coordinates. distinctive living codimenson varieties thought distributionally delta functions. explore residue plethora identities pages | non_dup | [] |
84332505 | 10.1007/JHEP11(2017)194 | In this paper we describe a novel, model-independent technique of
"rectangular aggregations" for mining the LHC data for hints of new physics. A
typical (CMS) search now has hundreds of signal regions, which can obscure
potentially interesting anomalies. Applying our technique to the two CMS
jets+MET SUSY searches, we identify a set of previously overlooked $\sim
3\sigma$ excesses. Among these, four excesses survive tests of inter- and
intra-search compatibility, and two are especially interesting: they are
largely overlapping between the jets+MET searches and are characterized by low
jet multiplicity, zero $b$-jets, and low MET and $H_T$. We find that resonant
color-triplet production decaying to a quark plus an invisible particle
provides an excellent fit to these two excesses and all other data -- including
the ATLAS jets+MET search, which actually sees a correlated excess. We discuss
the additional constraints coming from dijet resonance searches, monojet
searches and pair production. Based on these results, we believe the
wide-spread view that the LHC data contains no interesting excesses is greatly
exaggerated.Comment: 31 pages + appendices, 14 figures, source code for recasted searches
attached as auxiliary materia | Digging Deeper for New Physics in the LHC Data | digging deeper for new physics in the lhc data | rectangular aggregations mining hints physics. hundreds obscure potentially anomalies. jets susy searches overlooked sigma excesses. excesses survive intra compatibility largely overlapping jets searches multiplicity jets resonant triplet decaying invisible excellent excesses atlas jets sees excess. coming dijet searches monojet searches production. believe spread excesses greatly pages appendices recasted searches attached auxiliary materia | non_dup | [] |
84332048 | 10.1007/JHEP11(2017)196 | This paper proposes a new search program for dark sector parton showers at
the Large Hadron Collider (LHC). These signatures arise in theories
characterized by strong dynamics in a hidden sector, such as Hidden Valley
models. A dark parton shower can be composed of both invisible dark matter
particles as well as dark sector states that decay to Standard Model particles
via a portal. The focus here is on the specific case of 'semi-visible jets,'
jet-like collider objects where the visible states in the shower are Standard
Model hadrons. We present a Simplified Model-like parametrization for the LHC
observables and propose targeted search strategies for regions of parameter
space that are not covered by existing analyses. Following the 'mono-$X$'
literature, the portal is modeled using either an effective field theoretic
contact operator approach or with one of two ultraviolet completions;
sensitivity projections are provided for all three cases. We additionally
highlight that the LHC has a unique advantage over direct detection experiments
in the search for this class of dark matter theories.Comment: 36 pages, 14 figures; v2, JHEP versio | LHC Searches for Dark Sector Showers | lhc searches for dark sector showers | proposes parton showers hadron collider signatures arise hidden hidden valley models. parton shower composed invisible portal. visible jets collider visible shower hadrons. simplified parametrization observables propose targeted covered analyses. mono portal modeled theoretic ultraviolet completions projections cases. additionally highlight advantage pages jhep versio | non_dup | [] |
93951438 | 10.1007/JHEP11(2017)197 | Light-cone gauge formulation of relativistic dynamics of a continuous-spin
field propagating in the flat space is developed. Cubic interaction vertices of
continuous-spin massless fields and totally symmetric arbitrary spin massive
fields are studied. We consider parity invariant cubic vertices that involve
one continuous-spin massless field and two arbitrary spin massive fields and
parity invariant cubic vertices that involve two continuous-spin massless
fields and one arbitrary spin massive field. We construct the complete list of
such vertices explicitly. Also we demonstrate that there are no cubic vertices
describing consistent interaction of continuous-spin massless fields with
arbitrary spin massless fields.Comment: 49 pages, v2: Typos in text and eqs.(4.35),(B.13),(B.14),(B.24)
corrected. Above eqs.(3.37) and below eqs.(3.43), brief remarks adde | Cubic interaction vertices for continuous-spin fields and arbitrary spin
massive fields | cubic interaction vertices for continuous-spin fields and arbitrary spin massive fields | cone formulation relativistic propagating developed. cubic massless totally massive studied. parity cubic involve massless massive parity cubic involve massless massive field. explicitly. cubic describing massless massless pages typos eqs. corrected. eqs. eqs. brief remarks adde | non_dup | [] |
93949622 | 10.1007/JHEP11(2017)198 | We evaluate the master integrals for the two-loop, planar box-diagrams
contributing to the elastic scattering of muons and electrons at
next-to-next-to leading-order in QED. We adopt the method of differential
equations and the Magnus exponential series to determine a canonical set of
integrals, finally expressed as a Taylor series around four space-time
dimensions, with coefficients written as combination of generalised
polylogarithms. The electron is treated as massless, while we retain full
dependence on the muon mass. The considered integrals are also relevant for
crossing-related processes, such as di-muon production at $e^+ e^-$-colliders,
as well as for the QCD corrections to $top$-pair production at hadron
colliders.Comment: published version, 39 pages, 7 figures, 3 ancillary file | Master integrals for the NNLO virtual corrections to $\mu e$ scattering
in QED: the planar graphs | master integrals for the nnlo virtual corrections to $\mu e$ scattering in qed: the planar graphs | master integrals planar diagrams contributing elastic muons qed. adopt magnus exponential canonical integrals taylor generalised polylogarithms. massless retain muon mass. integrals crossing muon colliders hadron pages ancillary file | non_dup | [] |
93949020 | 10.1007/JHEP11(2017)199 | We give a formulation of linearized 11D supergravity in 4D, $N=1$ superspace
keeping all eleven bosonic coordinates. The fields are fluctuations around
$\mathbf M=\mathbf R^{4|4}\times Y$, where $Y$ is a background Riemannian
7-manifold admitting a $G_2$ structure. We embed the 11D fields into superfield
representations of the 4D, $N=1$ superconformal algebra. These consist of the
conformal graviton superfield, seven conformal gravitino superfields, a tensor
hierarchy of superfields describing the 11D 3-form, and a non-abelian
Kaluza-Klein vector multiplet gauging the tensor hierarchy by diffeomorphisms
on $Y$. The quadratic action consists of the linearization of a superspace
volume term and a Chern-Simons action for the gauged hierarchy coupled to the
supergravity and gravitino superfields, and the full structure is fixed by
superconformal and gauge invariance. When this action is projected to
components, we recover the full linearized action of 11D supergravity.Comment: 33+16 page | Eleven-Dimensional Supergravity in 4D, $N=1$ Superspace | eleven-dimensional supergravity in 4d, $n=1$ superspace | formulation linearized supergravity superspace keeping eleven bosonic coordinates. mathbf mathbf riemannian manifold admitting structure. embed superfield representations superconformal algebra. consist conformal graviton superfield seven conformal gravitino superfields hierarchy superfields describing abelian kaluza klein multiplet gauging hierarchy diffeomorphisms quadratic linearization superspace chern simons gauged hierarchy supergravity gravitino superfields superconformal invariance. projected recover linearized | non_dup | [] |
83865625 | 10.1007/JHEP11(2017)200 | We extend our previous construction of global solutions to Type IIB
supergravity that are invariant under the superalgebra $F(4)$ and are realized
on a spacetime of the form $AdS_6 \times S^2$ warped over a Riemann surface
$\Sigma$ by allowing the supergravity fields to have non-trivial $SL(2,{\mathbb
R})$ monodromy at isolated punctures on $\Sigma$. We obtain explicit solutions
for the case where $\Sigma$ is a disc, and the monodromy generators are
parabolic elements of $SL(2,{\mathbb R})$ physically corresponding to the
monodromy allowed in Type IIB string theory. On the boundary of $\Sigma$ the
solutions exhibit singularities at isolated points which correspond to
semi-infinite five-branes, as is familiar from the global solutions without
monodromy. In the interior of $\Sigma$, the solutions are everywhere regular,
except at the punctures where $SL(2,{\mathbb R})$ monodromy resides and which
physically correspond to the locations of $[p,q]$ seven-branes. The solutions
have a compelling physical interpretation corresponding to fully localized
five-brane intersections with additional seven-branes, and provide candidate
holographic duals to the five-dimensional superconformal field theories
realized on such intersections.Comment: 43 pages, 6 figure | Warped $AdS_6\times S^2$ in Type IIB supergravity III: Global solutions
with seven-branes | warped $ads_6\times s^2$ in type iib supergravity iii: global solutions with seven-branes | extend supergravity superalgebra realized spacetime warped riemann sigma allowing supergravity trivial mathbb monodromy punctures sigma sigma disc monodromy generators parabolic mathbb physically monodromy theory. sigma exhibit singularities infinite branes familiar monodromy. interior sigma everywhere punctures mathbb monodromy resides physically locations seven branes. compelling localized brane intersections seven branes candidate holographic duals superconformal realized pages | non_dup | [] |
93943205 | 10.1007/JHEP11(2017)201 | We study the minimal seesaw model, where two right-handed Majorana neutrinos
are introduced, focusing on the CP violating phase. In addition, we take the
trimaximal mixing pattern for the neutrino flavor where the charged lepton mass
matrix is diagonal. Thanks to this symmetric framework, the $3\times 2$ Dirac
neutrino mass matrix is given in terms of a few parameters. Numerical studies
reveal that the observation of the CP violating phase can determine the flavor
structure of the Dirac neutrino mass matrix in the minimal seesaw model. In
particular, new minimal Dirac neutrino mass matrices are proposed in the case
of $\rm TM_1$, which is derived by the additional 2-3 family mixing to the
tri-bimaximal mixing basis in the normal hierarchy of neutrino masses. Our
analyses include the Littlest seesaw model by King {\it et al.}, which is one
of the specific one in our results. Furthermore, it is remarked that our
$3\times 2$ Dirac neutrino mass matrix is reproduced by introducing gauge
singlet flavons with the specific alignments of the VEV's. These alignments
suggest the residual symmetry of $S_4$ group.Comment: 27 pages, 27 figures, final versio | Towards the minimal seesaw model via CP violation of neutrinos | towards the minimal seesaw model via cp violation of neutrinos | seesaw handed majorana neutrinos focusing violating phase. trimaximal flavor lepton diagonal. thanks dirac parameters. reveal violating flavor dirac seesaw model. dirac bimaximal hierarchy masses. littlest seesaw king results. remarked dirac reproduced introducing singlet flavons alignments alignments residual pages versio | non_dup | [] |
86418626 | 10.1007/JHEP11(2017)202 | We show that neutral current (NC) measurements at neutrino detectors can play
a valuable role in the search for new physics. Such measurements have certain
intrinsic features and advantages that can fruitfully be combined with the
usual well-studied charged lepton detection channels in order to probe the
presence of new interactions or new light states. In addition to the fact that
NC events are immune to uncertainties in standard model neutrino mixing and
mass parameters, they can have small matter effects and superior rates since
all three flavours participate. We also show, as a general feature, that NC
measurements provide access to different combinations of CP phases and mixing
parameters compared to CC measurements at both long and short baseline
experiments. Using the Deep Underground Neutrino Experiment (DUNE) as an
illustrative setting, we demonstrate the capability of NC measurements to break
degeneracies arising in CC measurements, allowing us, in principle, to
distinguish between new physics that violates three flavour unitarity and that
which does not. Finally, we show that NC measurements can enable us to restrict
new physics parameters that are not easily constrained by CC measurements.Comment: 22 pages, 10 figure | What measurements of neutrino neutral current events can reveal | what measurements of neutrino neutral current events can reveal | neutral detectors valuable physics. intrinsic advantages fruitfully usual lepton states. immune superior flavours participate. combinations experiments. underground dune illustrative capability break degeneracies arising allowing distinguish violates flavour unitarity not. enable restrict constrained pages | non_dup | [] |
93946145 | 10.1007/JHEP11(2017)203 | It is known that soft photon and graviton theorems can be regarded as the
Ward-Takahashi identities of asymptotic symmetries. In this paper, we consider
soft theorem for pions, i.e., Nambu-Goldstone bosons associated with a
spontaneously broken axial symmetry. The soft pion theorem is written as the
Ward-Takahashi identities of the $S$-matrix under asymptotic transformations.
We investigate the asymptotic dynamics, and find that the conservation of
charges generating the asymptotic transformations can be interpreted as a pion
memory effect.Comment: 25 pages, 2 figures, v2: references and discussions adde | Soft pion theorem, asymptotic symmetry and new memory effect | soft pion theorem, asymptotic symmetry and new memory effect | graviton theorems regarded ward takahashi identities asymptotic symmetries. pions i.e. nambu goldstone bosons spontaneously broken axial symmetry. pion ward takahashi identities asymptotic transformations. asymptotic conservation charges generating asymptotic transformations interpreted pion pages discussions adde | non_dup | [] |
84327389 | 10.1007/JHEP11(2017)205 | We discuss the Hamiltonian dynamics of general relativity with real
connection variables on a null foliation, and use the Newman-Penrose formalism
to shed light on the geometric meaning of the various constraints. We identify
the equivalent of Sachs' constraint-free initial data as projections of
connection components related to null rotations, i.e. the translational part of
the ISO(2) group stabilising the internal null direction soldered to the
hypersurface. A pair of second-class constraints reduces these connection
components to the shear of a null geodesic congruence, thus establishing
equivalence with the second-order formalism, which we show in details at the
level of symplectic potentials. A special feature of the first-order
formulation is that Sachs' propagating equations for the shear, away from the
initial hypersurface, are turned into tertiary constraints; their role is to
preserve the relation between connection and shear under retarded time
evolution. The conversion of wave-like propagating equations into constraints
is possible thanks to an algebraic Bianchi identity; the same one that allows
one to describe the radiative data at future null infinity in terms of a shear
of a (non-geodesic) asymptotic null vector field in the physical spacetime.
Finally, we compute the modification to the spin coefficients and the null
congruence in the presence of torsion.Comment: 23 pages + Appendix, 2 figures. v2: Improved text and some amendments
throughout, added more details on the relation between 2+2 foliations and
null tetrads, updated references. Version submitted for peer reviewing. v3:
Few minor amendments, footnote added on a null congruence in the presence of
torsion; matches published versio | Sachs' free data in real connection variables | sachs' free data in real connection variables | relativity connection foliation newman penrose formalism shed geometric meaning constraints. sachs projections connection rotations i.e. translational stabilising soldered hypersurface. reduces connection geodesic congruence establishing equivalence formalism symplectic potentials. formulation sachs propagating away hypersurface turned tertiary preserve connection retarded evolution. conversion propagating thanks algebraic bianchi radiative infinity geodesic asymptotic spacetime. modification congruence pages figures. amendments foliations tetrads updated references. submitted peer reviewing. minor amendments footnote congruence torsion matches versio | non_dup | [] |
93949868 | 10.1007/JHEP11(2017)206 | The pseudoscalar correlator is an ideal lattice probe for thermal
modifications to quarkonium spectra, given that it is not compromised by a
contribution from a large transport peak. We construct a perturbative spectral
function incorporating resummed thermal effects around the threshold and vacuum
asymptotics above the threshold, and compare the corresponding imaginary-time
correlators with continuum-extrapolated lattice data for quenched SU(3) at
several temperatures. Modest differences are observed, which may originate from
non-perturbative mass shifts or renormalization factors, however no resonance
peaks are needed for describing the quenched lattice data for charmonium at and
above T ~ 1.1Tc ~ 350 MeV. For comparison, in the bottomonium case a good
description of the lattice data is obtained with a spectral function containing
a single thermally broadened resonance peak.Comment: 28 pages. v2: published versio | Thermal quarkonium physics in the pseudoscalar channel | thermal quarkonium physics in the pseudoscalar channel | pseudoscalar correlator ideal modifications quarkonium compromised peak. perturbative incorporating resummed asymptotics imaginary correlators continuum extrapolated quenched temperatures. modest originate perturbative shifts renormalization describing quenched charmonium mev. bottomonium thermally broadened pages. versio | non_dup | [] |
93942587 | 10.1007/JHEP11(2017)207 | We construct explicit examples of fibre inflation models which are globally
embedded in type IIB orientifolds with chiral matter on D7-branes and full
closed string moduli stabilisation. The minimal setup involves a Calabi-Yau
threefold with h^{1,1}=4 Kaehler moduli which features multiple K3 fibrations
and a del Pezzo divisor supporting non-perturbative effects. We perform a
consistent choice of orientifold involution, brane setup and gauge fluxes which
leads to chiral matter and a moduli-dependent Fayet-Iliopoulos term. After
D-term stabilisation, the number of Kaehler moduli is effectively reduced to 3
and the internal volume reduces to the one of fibre inflation models. The
inflationary potential is generated by suitable string loop corrections in
combination with higher derivative effects. We analyse the inflationary
dynamics both in the single-field approximation and by numerically deriving the
full multi-field evolution in detail. Interestingly, we find that the Kaehler
cone conditions set strong constraints on the allowed inflaton field range.Comment: 34 pages + appendix; reference added and typos correcte | Chiral Global Embedding of Fibre Inflation Models | chiral global embedding of fibre inflation models | fibre inflation globally embedded orientifolds chiral branes moduli stabilisation. setup involves calabi threefold kaehler moduli fibrations pezzo divisor supporting perturbative effects. orientifold involution brane setup fluxes chiral moduli fayet iliopoulos term. stabilisation kaehler moduli effectively reduces fibre inflation models. inflationary effects. analyse inflationary numerically deriving detail. interestingly kaehler cone inflaton pages typos correcte | non_dup | [] |
129356831 | 10.1007/JHEP11(2018)017 | We show that 10D spinor helicity formalism can be understood as spinor moving
frame approach to supersymmetric particles extended to the description of
amplitudes. This allows us to develop the spinor helicity formalism for 11D
supergravity and a new constrained superfield formalism for 10D SYM and 11D
SUGRA amplitudes. We show how the constrained on-shell superfields,
one-particle counterparts of the superamplitudes, can be obtained by
quantization of massless superparticle mechanics.
We make some stages towards the calculation of amplitudes of 10D SYM and 11D
SUGRA in this framework. In particular we have found supersymmetric Ward
identities for constrained amplitudes and an especially convenient gauge, fixed
on the spinor frame variables corresponding to scattered particles, which
promises to be an extremely useful tool for further development of our
approach.
We also discuss a candidate for generalization of the BCFW recurrent
relations for the constrained tree superamplitudes, indicate and discuss a
problem of dependence of the expressions obtained with it on a deformation
vector, which is not fixed uniquely in higher dimensional $D>4$ cases.Comment: 73 pages, no figures. V2: revised. Discussion improved and extended,
78 pages. V3. Published version, 82 page | Spinor frame formalism for amplitudes and constrained superamplitudes of
10D SYM and 11D supergravity | spinor frame formalism for amplitudes and constrained superamplitudes of 10d sym and 11d supergravity | spinor helicity formalism understood spinor moving supersymmetric amplitudes. spinor helicity formalism supergravity constrained superfield formalism sugra amplitudes. constrained superfields counterparts superamplitudes quantization massless superparticle mechanics. amplitudes sugra framework. supersymmetric ward identities constrained amplitudes convenient spinor scattered promises extremely approach. candidate generalization bcfw recurrent constrained superamplitudes expressions deformation uniquely pages figures. revised. pages. | non_dup | [] |
188016602 | 10.1007/JHEP11(2018)040 | A search is performed for resonant and non-resonant Higgs boson pair production in the γγbb¯¯ final state. The data set used corresponds to an integrated luminosity of 36.1 fb−1 of proton-proton collisions at a centre-of-mass energy of 13 TeV recorded by the ATLAS detector at the CERN Large Hadron Collider. No significant excess relative to the Standard Model expectation is observed. The observed limit on the non-resonant Higgs boson pair cross-section is 0.73 pb at 95% confidence level. This observed limit is equivalent to 22 times the predicted Standard Model cross-section. The Higgs boson self-coupling (κλ = λHHH/λ HHH SM ) is constrained at 95% confidence level to −8.2 < κλ < 13.2. For resonant Higgs boson pair production through X→HH→γγbb¯¯, the limit is presented, using the narrow-width approximation, as a function of mX in the range 260 GeV < mX < 1000 GeV. The observed limits range from 1.1 pb to 0.12 pb over this mass range | Search for Higgs boson pair production in the γγbb¯¯ final state with 13 TeV pp collision data collected by the ATLAS experiment | search for higgs boson pair production in the γγbb¯¯ final state with 13 tev pp collision data collected by the atlas experiment | resonant resonant boson γγbb¯¯ state. luminosity proton proton collisions atlas cern hadron collider. excess expectation observed. resonant boson confidence level. section. boson λhhh constrained confidence resonant boson x→hh→γγbb¯¯ narrow gev. | non_dup | [] |
162294282 | 10.1007/JHEP11(2018)064 | Three dimensional supersymmetric gauge theories are often in a gapped phase, in which SUSY is spontaneously broken, if all the matter fields are massive and decoupled in the low energy. We study this phase in the large N limit using the localization technique for the theory on the ellipsoid, which interpolates the round three sphere and the flat space compactified on S¹. We find a large N saddle point solution for the gauge theory with some massive matter fields. This solution gives a vanishing (generalized) Polyakov loop in the flat space limit, thus, it corresponds to the confining phase at the leading order in the 1/N expansion | Supersymmetry breaking phase in three dimensional large N gauge theories | supersymmetry breaking phase in three dimensional large n gauge theories | supersymmetric gapped susy spontaneously broken massive decoupled energy. localization ellipsoid interpolates round sphere compactified saddle massive fields. vanishing polyakov confining | non_dup | [] |
129355179 | 10.1007/JHEP11(2018)066 | Dark matter may reside in sector without Standard Model (SM) gauge
interactions. One way in which such a dark sector can still impact SM particles
through non-gravitational interactions is via the "photon portal" in which a
dark photon kinetically mixes with the ordinary SM photon. We study the
implications of this setup for electron recoil events at TEXONO reactor and
nuclear recoil events at the COHERENT experiment. We find that the recent
COHERENT data rules out previously allowed regions of parameter space favored
by the thermal relic hypothesis for the DM abundance. When mapped onto the
DM-electron cross section, we find that COHERENT provides the leading direct
constraints for DM masses < 30 MeV.Comment: 13 pages, 3 figures, extended study for both fermionic and scalar DM;
to appear in JHE | Constraining Photon Portal Dark Matter with Texono and Coherent Data | constraining photon portal dark matter with texono and coherent data | reside interactions. gravitational portal kinetically mixes ordinary photon. setup recoil texono reactor recoil coherent experiment. coherent favored relic abundance. mapped coherent pages fermionic | non_dup | [] |
162912079 | 10.1007/JHEP11(2018)081 | We propose a mechanism that allows for sizeable flavour violation in quark-lepton currents, while suppressing flavour changing neutral currents in quark-quark and lepton-lepton sectors. The mechanism is applied to the recently proposed “4321” renormalizable model, which can accommodate the current experimental anomalies in B-meson decays, both in charged and neutral currents, while remaining consistent with all other indirect flavour and electroweak precision measurements and direct searches at high-pT. To support this claim, we present an exhaustive phenomenological survey of this fully calculable UV complete model and highlight the rich complementarity between indirect and direct searches | Maximal flavour violation : a Cabibbo mechanism for leptoquarks. | maximal flavour violation : a cabibbo mechanism for leptoquarks. | propose sizeable flavour violation lepton currents suppressing flavour changing neutral currents lepton lepton sectors. renormalizable accommodate anomalies meson decays neutral currents indirect flavour electroweak precision searches claim exhaustive phenomenological calculable highlight complementarity indirect searches | non_dup | [] |
188016600 | 10.1007/JHEP11(2018)085 | A search for charged Higgs bosons heavier than the top quark and decaying via H± → tb is presented. The data analysed corresponds to 36.1 fb−1 of pp collisions at s√=13 TeV and was recorded with the ATLAS detector at the LHC in 2015 and 2016. The production of a charged Higgs boson in association with a top quark and a bottom quark, pp → tbH±, is explored in the mass range from mH± = 200 to 2000 GeV using multi-jet final states with one or two electrons or muons. Events are categorised according to the multiplicity of jets and how likely these are to have originated from hadronisation of a bottom quark. Multivariate techniques are used to discriminate between signal and background events. No significant excess above the background-only hypothesis is observed and exclusion limits are derived for the production cross-section times branching ratio of a charged Higgs boson as a function of its mass, which range from 2.9 pb at mH± = 200 GeV to 0.070 pb at mH± = 2000 GeV. The results are interpreted in two benchmark scenarios of the Minimal Supersymmetric Standard Model | Search for charged Higgs bosons decaying into top and bottom quarks at s√=13 TeV with the ATLAS detector | search for charged higgs bosons decaying into top and bottom quarks at s√=13 tev with the atlas detector | bosons heavier decaying presented. analysed collisions atlas boson tbh± explored muons. categorised multiplicity jets originated hadronisation quark. multivariate discriminate events. excess exclusion branching boson gev. interpreted benchmark scenarios supersymmetric | non_dup | [] |
146473399 | 10.1007/JHEP11(2018)117 | The equivalent of fusion in boundary conformal field theory (CFT) can be
realized quite simply in the context of lattice models by essentially glueing
two open spin chains. This has led to many developments, in particular in the
context of chiral logarithmic CFT. We consider in this paper a possible
generalization of the idea to the case of bulk conformal field theory. This is
of course considerably more difficult, since there is no obvious way of merging
two closed spin chains into a big one. In an earlier paper, two of us had
proposed a "topological" way of performing this operation in the case of models
based on the affine Temperley-Lieb (ATL) algebra, by exploiting the associated
braid group representation and skein relations. In the present work, we
establish - using, in particular, Frobenius reciprocity - the resulting fusion
rules for standard modules of ATL in the generic as well as partially
degenerate cases. These fusion rules have a simple interpretation in the
continuum limit. However, unlike in the chiral case this interpretation does
not match the usual fusion in non-chiral CFTs. Rather, it corresponds to the
glueing of the right moving component of one conformal field with the left
moving component of the other.Comment: 40pp, v2: Acknowledgments added, v3: typos fixed and few explanations
added, for a version in JHE | A fusion for the periodic Temperley-Lieb algebra and its continuum limit | a fusion for the periodic temperley-lieb algebra and its continuum limit | fusion conformal realized essentially glueing chains. developments chiral logarithmic cft. generalization conformal theory. considerably obvious merging chains one. topological performing affine temperley lieb exploiting braid skein relations. establish frobenius reciprocity fusion modules generic partially degenerate cases. fusion continuum limit. unlike chiral match usual fusion chiral cfts. glueing moving conformal moving acknowledgments typos explanations | non_dup | [] |
141535256 | 10.1007/JHEP11(2018)132 | We investigate whether one can observe in SO(3) and SO(4) (lattice) gauge
theories the presence of spinorial flux tubes, i.e. ones that correspond to the
fundamental representation of SU(2); and similarly for SO(6) and SU(4). We do
so by calculating the finite volume dependence of the JP=2+ glueball in 2+1
dimensions, using lattice simulations. We show how this provides strong
evidence that these SO(N) gauge theories contain states that are composed of
pairs of (conjugate) winding spinorial flux tubes, i.e. ones that are in the
(anti)fundamental of the corresponding SU(N') gauge theories. Moreover, these
two flux tubes can be arbitrarily far apart. This is so despite the fact that
the fields that are available in the SO(N) lattice field theories do not appear
to allow us to construct operators that project onto single spinorial flux
tubes.Comment: 23 pages, 8 figures, reference to recent relevant paper, version to
be submitted to journa | Spinorial flux tubes in SO(N) gauge theories in 2+1 dimensions | spinorial flux tubes in so(n) gauge theories in 2+1 dimensions | spinorial tubes i.e. calculating glueball simulations. composed conjugate winding spinorial tubes i.e. theories. tubes arbitrarily apart. spinorial pages submitted journa | non_dup | [] |
146473991 | 10.1007/JHEP11(2018)148 | We study the two-point function of local operators in the presence of a
defect in a generic conformal field theory. We define two pairs of cross
ratios, which are convenient in the analysis of the OPE in the bulk and defect
channel respectively. The new coordinates have a simple geometric
interpretation, which can be exploited to efficiently compute conformal blocks
in a power expansion. We illustrate this fact in the case of scalar external
operators. We also elucidate the convergence properties of the bulk and defect
OPE decompositions of the two-point function. In particular, we remark that the
expansion of the two-point function in powers of the new cross ratios converges
everywhere, a property not shared by the cross ratios customarily used in
defect CFT. We comment on the crucial relevance of this fact for the numerical
bootstrap.Comment: Matches journal version; the attached mathematica file (Bulk CB.nb +
rec.txt) computes the conformal blocks in the bulk channe | Radial coordinates for defect CFTs | radial coordinates for defect cfts | defect generic conformal theory. convenient defect respectively. geometric exploited efficiently conformal blocks expansion. illustrate operators. elucidate defect decompositions function. remark powers converges everywhere shared customarily defect cft. comment crucial relevance matches attached mathematica file cb.nb rec.txt computes conformal blocks channe | non_dup | [] |
188187132 | 10.1007/JHEP11(2018)151 | A search for the electroweak production of supersymmetric particles in proton-proton collisions at a center-of-mass energy of 13 TeV is presented in final states with a τ lepton pair. Both hadronic and leptonic decay modes are considered for the τ leptons. Scenarios involving the direct pair production of τ sleptons, or their indirect production via the decays of charginos and neutralinos, are investigated. The data correspond to an integrated luminosity of 35.9 fb⁻¹ collected with the CMS detector in 2016. The observed number of events is consistent with the standard model background expectation. The results are interpreted as upper limits on the cross section for τ slepton pair production in different scenarios. The strongest limits are observed in the scenario of a purely left-handed low mass τ slepton decaying to a nearly massless neutralino. Exclusion limits are also set in the context of simplified models of chargino-neutralino and chargino pair production with decays to τ leptons, and range up to 710 and 630 GeV, respectively. Keywords: Hadron-Hadron scattering (experiments); Supersymmetr | Search for Supersymmetry in Events with a τ Lepton Pair and Missing Transverse Momentum in Proton-Proton Collisions at √s = 13 TeV | search for supersymmetry in events with a τ lepton pair and missing transverse momentum in proton-proton collisions at √s = 13 tev | electroweak supersymmetric proton proton collisions lepton pair. hadronic leptonic leptons. scenarios involving sleptons indirect decays charginos neutralinos investigated. luminosity fb⁻¹ expectation. interpreted slepton scenarios. strongest purely handed slepton decaying nearly massless neutralino. exclusion simplified chargino neutralino chargino decays leptons respectively. keywords hadron hadron supersymmetr | non_dup | [] |
188187131 | 10.1007/JHEP11(2018)152 | A search for a Higgs boson decaying into a pair of electrons or muons and a photon is described. Higgs boson decays to a Z boson and a photon (H → Zγ → ℓℓγ, ℓ = e or μ), or to two photons, one of which has an internal conversion into a muon pair (H → γ*γ → μμγ) were considered. The analysis is performed using a data set recorded by the CMS experiment at the LHC from proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.9 fb⁻¹. No significant excess above the background prediction has been found. Limits are set on the cross section for a standard model Higgs boson decaying to opposite-sign electron or muon pairs and a photon. The observed limits on cross section times the corresponding branching fractions vary between 1.4 and 4.0 (6.1 and 11.4) times the standard model cross section for H → γ*γ → μμγ (H → Zγ → ℓℓγ) in the 120–130 GeV mass range of the ℓℓγ system. The H → γ*γ → μμγ and H → Zγ →ℓℓγ analyses are combined for mH =125GeV, obtaining an observed (expected) 95% confidence level upper limit of 3.9 (2.0) times the standard model cross section. Keywords: Beyond Standard Model; Hadron-Hadron scattering (experiments); Higgs Physic | Search for the Decay of a Higgs Boson in the ℓℓγ Channel in Proton-Proton Collisions at √s = 13 TeV | search for the decay of a higgs boson in the ℓℓγ channel in proton-proton collisions at √s = 13 tev | boson decaying muons described. boson decays boson photons conversion muon considered. proton proton collisions luminosity fb⁻¹. excess found. boson decaying opposite muon photon. branching fractions vary system. →ℓℓγ obtaining confidence section. keywords hadron hadron physic | non_dup | [] |
141531587 | 10.1007/JHEP11(2018)153 | We present a complete momentum-space prescription for the renormalisation of
tensorial correlators in conformal field theories. Our discussion covers all
3-point functions of stress tensors and conserved currents in arbitrary
spacetime dimensions. In dimensions three and four, we give explicit results
for the renormalised correlators, the anomalous Ward identities they obey, and
the conformal anomalies. For the stress tensor 3-point function in four
dimensions, we identify the specific evanescent tensorial structure responsible
for the type A Euler anomaly, and show this anomaly has the form of a double
copy of the chiral anomaly.Comment: 70 pages; published versio | Renormalised 3-point functions of stress tensors and conserved currents
in CFT | renormalised 3-point functions of stress tensors and conserved currents in cft | prescription renormalisation tensorial correlators conformal theories. covers tensors conserved currents spacetime dimensions. renormalised correlators anomalous ward identities obey conformal anomalies. evanescent tensorial euler anomaly anomaly copy chiral pages versio | non_dup | [] |
162912287 | 10.1007/JHEP11(2018)173 | We discuss the breaking of SO(3) down to finite family symmetries such as A4, S4 and A5 using supersymmetric potentials for the first time. We analyse in detail the case of supersymmetric A4 and its finite subgroups Z3 and Z2. We then propose a supersymmetric A4 model of leptons along these lines, originating from SO(3) × U(1), which leads to a phenomenologically acceptable pattern of lepton mixing and masses once subleading corrections are taken into account. We also discuss the phenomenological consequences of having a gauged SO(3), leading to massive gauge bosons, and show that all domain wall problems are resolved in this mode | Spontaneous breaking of SO(3) to finite family symmetries with supersymmetry — an A4 model. | spontaneous breaking of so(3) to finite family symmetries with supersymmetry — an a4 model. | breaking symmetries supersymmetric potentials time. analyse supersymmetric subgroups propose supersymmetric leptons originating phenomenologically acceptable lepton subleading account. phenomenological consequences gauged massive bosons resolved | non_dup | [] |
146471995 | 10.1007/JHEP11(2018)176 | Since holography yields exact results, even in situations where perturbation
theory is not applicable, it is an ideal framework for modeling strongly
correlated systems. We extend previous holographic methods to take the
dynamical charge response into account and use this to perform the first
holographic computation of the dispersion relation for plasmons. As the
dynamical charge response of strange metals can be measured using the new
technique of momentum-resolved electron energy-loss spectroscopy (M-EELS),
plasmon properties are the next milestone in verifying predictions from
holographic models of new states of matter.Comment: 12 pages, 2 figures. v2: Minor changes v3: Minor adjustments v4:
Published versio | Holographic Plasmons | holographic plasmons | holography situations perturbation applicable ideal systems. extend holographic holographic plasmons. strange metals resolved spectroscopy eels plasmon milestone verifying holographic pages figures. minor minor adjustments versio | non_dup | [] |
162912286 | 10.1007/JHEP11(2018)180 | We describe a new method to parameterise dark energy theories including massive gravity, elastic dark energy and tensor-metric theories. We first examine the existing framework which describes any second order Lagrangian which depends on the variation of the metric and find new constraints on the parameters. We extend the method to Lorentz violating theories which depend on the variation of the time and spatial parts of the metric separately. We show how this can describe massive gravity and elastic dark energy, while ruling out the whole class of theories where the Lagrangian depends only on the variation of the time part of the metric.\ud
\ud
We further generalise our method to tensor-metric theories, both with and without splitting the metric into time and spatial parts. Our method extends existing physics by providing a mechanism to easily evaluate large classes of dark energy theories | Cosmological perturbations in generalised dark Lagrangians. | cosmological perturbations in generalised dark lagrangians. | parameterise massive elastic theories. examine describes lagrangian parameters. extend lorentz violating separately. massive elastic ruling lagrangian metric. generalise splitting parts. extends | non_dup | [] |
188187136 | 10.1007/JHEP11(2018)185 | Measurements of Higgs boson properties in the H → γγ decay channel are reported. The analysis is based on data collected by the CMS experiment in proton-proton collisions at √s = 13 TeV during the 2016 LHC running period, corresponding to an integrated luminosity of 35.9 fb⁻¹. Allowing the Higgs mass to float, the measurement yields a signal strength relative to the standard model prediction of 1.18[subscript − 0.14][superscript + 0.17] = 1.18[subscript − 0.11][superscript + 0.12] (stat)[subscript − 0.07][superscript + 0.09](syst)[subscript − 0.06][superscript + 0.07](theo), which is largely insensitive to the exact Higgs mass around 125 GeV. Signal strengths associated with the different Higgs boson production mechanisms, couplings to bosons and fermions, and effective couplings to photons and gluons are also measured. Keywords: Hadron-Hadron scattering (experiments); Higgs physics Photon productio | Measurements of Higgs Boson Properties in the Diphoton Decay Channel in Proton-Proton Collisions at √s =13 TeV | measurements of higgs boson properties in the diphoton decay channel in proton-proton collisions at √s =13 tev | boson reported. proton proton collisions running luminosity fb⁻¹. allowing float subscript superscript subscript superscript stat subscript superscript syst subscript superscript theo largely insensitive gev. strengths boson couplings bosons fermions couplings photons gluons measured. keywords hadron hadron productio | non_dup | [] |
146475684 | 10.1007/JHEP11(2018)202 | We consider the relation of mixed global gauge gravitational anomalies and
boundary conformal field theory in WZW models for simple Lie groups. The
discrete symmetries of consideration are the centers of the simple Lie groups.
These mixed anomalies prevent to gauge them i.e, take the orbifold by the
center. The absence of anomalies impose conditions on the levels of WZW models.
Next, we study the conformal boundary conditions for the original theories. We
consider the existence of a conformal boundary state invariant under the action
of the center. This also gives conditions on the levels of WZW models. By
considering the combined action of the center and charge conjugation on
boundary states, we reproduce the condition obtained in the orbifold analysis.Comment: 24pages, 1 figure, references adde | Mixed global anomalies and boundary conformal field theories | mixed global anomalies and boundary conformal field theories | gravitational anomalies conformal groups. symmetries consideration centers groups. anomalies prevent orbifold center. anomalies impose models. conformal theories. conformal center. models. conjugation reproduce orbifold pages adde | non_dup | [] |
2127777 | 10.1007/JHEP12(2010)001 | Noncommutative spacetimes lead to nonlocal quantum field theories (qft's)
where spin-statistics theorems cannot be proved. For this reason, and also
backed by detailed arguments, it has been suggested that they get corrected on
such spacetimes leading to small violations of the Pauli principle. In a recent
paper \cite{Pauli}, Pauli-forbidden transitions from spacetime noncommutativity
were calculated and confronted with experiments. Here we give details of the
computation missing from this paper. The latter was based on a spacetime
$\mathcal{B}_{\chi\vec{n}}$ different from the Moyal plane. We argue that it
quantizes time in units of $\chi$. Energy is then conserved only mod
$\frac{2\pi}{\chi}$. Issues related to superselection rules raised by non-Pauli
effects are also discussed in a preliminary manner.Comment: 15 Pages, 1 Table, Full details and further developments of
arXiv:1003.2250. This version is close to the one accepted by JHE | Non-Pauli Effects from Noncommutative Spacetimes | non-pauli effects from noncommutative spacetimes | noncommutative spacetimes nonlocal theorems proved. backed arguments corrected spacetimes violations pauli principle. cite pauli pauli forbidden spacetime noncommutativity confronted experiments. missing paper. spacetime mathcal moyal plane. argue quantizes conserved frac superselection raised pauli preliminary pages developments | non_dup | [] |
2147280 | 10.1007/JHEP12(2010)003 | At the level of the bosonic fields, we construct consistent Kaluza--Klein
reductions of D=11 supergravity on $\Sigma_3\times S^4$, where
$\Sigma_3=H^3/\Gamma,S^3/\Gamma$ or $R^3/\Gamma$ where $\Gamma$ is a discrete
group of isometries.
The result is the bosonic content of an N=2 D=4 gauged supergravity with a
single vector multiplet and two hypermultiplets, whose scalar fields
parametrise $SU(1,1)/U(1)\times G_{2(2)}/SO(4)$. %, and the gauging is only in
the hypermultiplet When $\Sigma_3=H^3/\Gamma$ the D=4 theory has an $AdS_4$
vacuum which uplifts to the known supersymmetric $AdS_4\times H^3/\Gamma\times
S^4$ solution of D=11 supergravity that describes the N=2 $d=3$ SCFT arising
when M5-branes wrap SLag 3-cycles $H^3/\Gamma$ in Calabi-Yau three-folds. We
use the KK reduction for $\Sigma_3=H^3/\Gamma$ to construct D=11 black hole
solutions that describe these d=3 SCFTs at finite temperature and charge
density and show that there is a superconducting instability involving a
charged scalar field, and another instability involving involving neutral
fields including both scalar and vector fields. We also use this KK reduction
to construct a D=11 Lifshitz solution that is dual to a d=3 field theory with
dynamical exponent $z\sim 39$.Comment: 47 pages, reference added, typos corrected. Published versio | Wrapped M5-branes, consistent truncations and AdS/CMT | wrapped m5-branes, consistent truncations and ads/cmt | bosonic kaluza klein reductions supergravity sigma sigma gamma gamma gamma gamma isometries. bosonic gauged supergravity multiplet hypermultiplets parametrise gauging hypermultiplet sigma gamma uplifts supersymmetric gamma supergravity describes scft arising branes wrap slag cycles gamma calabi folds. sigma gamma scfts superconducting instability involving instability involving involving neutral fields. lifshitz exponent .comment pages typos corrected. versio | non_dup | [] |
2148961 | 10.1007/JHEP12(2010)004 | We consider "Orientifold field theories", namely SU(N) gauge theories with
Dirac fermions in the two-index representation at high temperature. When N is
even these theories exhibit a spontaneously broken Z2 centre symmetry. We study
aspects of the domain wall that interpolates between the two vacua of the
theory. In particular we calculate its tension to two-loop order. We compare
its tension to the corresponding domain wall in a SU(N) gauge theory with
adjoint fermions and find an agreement at large-N, as expected from planar
equivalence between the two theories. Moreover, we provide a non-perturbative
proof for the coincidence of the tensions at large-N. We also discuss the
vacuum structure of the theory when the fermion is given a large mass and argue
that there exist N-2 metastable vacua. We calculate the lifetime of those vacua
in the thin wall approximation.Comment: 29 pages, 4 figures. v2: minor changes in the introduction section.
to appear in JHE | Domain Walls and Metastable Vacua in Hot Orientifold Field Theories | domain walls and metastable vacua in hot orientifold field theories | orientifold dirac fermions temperature. exhibit spontaneously broken symmetry. interpolates vacua theory. tension order. tension adjoint fermions planar equivalence theories. perturbative coincidence tensions fermion argue metastable vacua. lifetime vacua pages figures. minor section. | non_dup | [] |
2125189 | 10.1007/JHEP12(2010)005 | We discuss the issue of how to include magnetic charges in the AdS(4)
superalgebra osp(4|2). It is shown that the usual way of introducing a
pseudoscalar central charge on the right hand side of the basic anticommutator
does not work, because this breaks SO(2,3) covariance. We propose a way out by
promoting the magnetic charge to a vector charge, which amounts to enlarge
osp(4|2) to the superconformal algebra su(2,2|1). The conditions for 1/4, 1/2
and 3/4 BPS states are then analyzed. These states form the boundary of the
convex cone associated with the Jordan algebra of 4x4 complex hermitian
matrices. An Inonu-Wigner contraction of the constructed superalgebra yields a
known extension of the Poincare' superalgebra containing electric and magnetic
0-brane charges as well as string- and space-filling 3-brane charges. As an
example, we show how some supersymmetric AdS(4) black holes fit into the
classification scheme of BPS states.Comment: 17 pages, uses JHEP3.cls. v2: ref. added. v3: Section "Final remarks"
and refs. adde | Magnetic charges in the AdS(4) superalgebra osp(4|2) | magnetic charges in the ads(4) superalgebra osp(4|2) | charges superalgebra usual introducing pseudoscalar anticommutator breaks covariance. propose promoting amounts enlarge superconformal analyzed. convex cone jordan hermitian matrices. inonu wigner contraction superalgebra poincare superalgebra brane charges filling brane charges. supersymmetric holes pages jhep .cls. ref. added. remarks refs. adde | non_dup | [] |
2141712 | 10.1007/JHEP12(2010)006 | We study cosmic-rays in decaying dark matter scenario, assuming that the dark
matter is the lightest superparticle and it decays through a R-parity violating
operator. We calculate the fluxes of cosmic-rays from the decay of the dark
matter and those from the standard astrophysical phenomena in the same
propagation model using the GALPROP package. We reevaluate the preferred
parameters characterizing standard astrophysical cosmic-ray sources with taking
account of the effects of dark matter decay. We show that, if energetic leptons
are produced by the decay of the dark matter, the fluxes of cosmic-ray positron
and electron can be in good agreements with both PAMELA and Fermi-LAT data in
wide parameter region. It is also discussed that, in the case where sizable
number of hadrons are also produced by the decay of the dark matter, the mass
of the dark matter is constrained to be less than 200-300 GeV in order to avoid
the overproduction of anti-proton. We also show that the cosmic gamma-ray flux
can be consistent with the results of Fermi-LAT observation if the mass of the
dark matter is smaller than nearly 4 TeV.Comment: 24 pages, 5 figure | Decaying Dark Matter in Supersymmetric Model and Cosmic-Ray Observations | decaying dark matter in supersymmetric model and cosmic-ray observations | cosmic rays decaying lightest superparticle decays parity violating operator. fluxes cosmic rays astrophysical phenomena propagation galprop package. reevaluate preferred characterizing astrophysical cosmic decay. energetic leptons fluxes cosmic positron agreements pamela fermi region. sizable hadrons constrained avoid overproduction proton. cosmic gamma fermi nearly pages | non_dup | [] |
2095798 | 10.1007/JHEP12(2010)008 | We study loop corrections to correlation functions of inflationary
perturbations. Previous calculations have found that the two-point function can
have a logarithmic running of the form log(k/mu), where k is the wavenumber of
the perturbation, and mu is the renormalization scale. We highlight that this
result would have profound consequences for both eternal inflation and the
predictivity of standard inflation. We find a different result. We consider two
sets of theories: one where the inflaton has a large cubic self-interaction and
one where the inflaton interacts gravitationally with N massless spectator
scalar fields. We find that there is a logarithmic running but of the form
log(H/mu), where H is the Hubble constant during inflation. We find this result
in three independent ways: by performing the calculation with a sharp cutoff in
frequency-momentum space, in dimensional regularization and by the simple
procedure of making the loop integral dimensionless. For the simplest of our
theories we explicitly renormalize the correlation function proving that the
divergencies can be reabsorbed and that the correlation function for
super-horizon modes does not depend on time (once the tadpole terms have been
properly taken into account). We prove the time-independence of the
super-horizon correlation function in several additional ways: by doing the
calculation of the correlation function at finite time using both the
regularizations and by developing a formalism which expresses loop corrections
directly in terms of renormalized quantities at each time. We find this last
formalism particularly helpful to develop intuition which we then use to
generalize our results to higher loops and different interactions.Comment: 51 pages, 7 figure | On Loops in Inflation | on loops in inflation | inflationary perturbations. logarithmic running wavenumber perturbation renormalization scale. highlight profound consequences eternal inflation predictivity inflation. result. inflaton cubic inflaton interacts gravitationally massless spectator fields. logarithmic running hubble inflation. ways performing sharp cutoff regularization dimensionless. simplest explicitly renormalize proving divergencies reabsorbed super horizon tadpole properly independence super horizon ways regularizations formalism expresses renormalized quantities time. formalism helpful intuition generalize loops pages | non_dup | [] |
2144610 | 10.1007/JHEP12(2010)009 | We study counterterms (CT's), candidates for UV divergences in the
four-dimensional N=8 supergravity. They have been constructed long ago in a
Lorentz covariant on shell superspace and recently in the chiral light-cone
(LC) superspace. We prove that all of these CT's are ruled out since they are
not available in the real LC superspace. This implies the perturbative UV
finiteness of d=4 N=8 supergravity under the assumption that supersymmetry and
continuous E7 symmetry are anomaly-free. The proof, based on the chiral nature
of CT's in the LC superspace, is a generalization of the perturbative F-term
non-renormalization theorem for N=8 supergravity.Comment: 18 page | The Ultraviolet Finiteness of N=8 Supergravity | the ultraviolet finiteness of n=8 supergravity | counterterms candidates divergences supergravity. lorentz covariant superspace chiral cone superspace. ruled superspace. perturbative finiteness supergravity supersymmetry anomaly free. chiral superspace generalization perturbative renormalization | non_dup | [] |
2108694 | 10.1007/JHEP12(2010)010 | In this paper we analyse formulas which reproduce different contributions to
scattering amplitudes in N=4 super Yang-Mills theory through a Grassmannian
integral. Recently their Yangian invariance has been proved directly by using
the explicit expression of the Yangian level-one generators. The specific
cyclic structure of the form integrated over the Grassmannian enters in a
crucial way in demonstrating the symmetry. Here we show that the Yangian
symmetry fixes this structure uniquely.Comment: 26 pages. v2: typos corrected, published versio | The Yangian origin of the Grassmannian integral | the yangian origin of the grassmannian integral | analyse formulas reproduce amplitudes super mills grassmannian integral. yangian invariance proved yangian generators. cyclic grassmannian enters crucial demonstrating symmetry. yangian fixes pages. typos corrected versio | non_dup | [] |
2135909 | 10.1007/JHEP12(2010)012 | We start from the classical action describing a single M2-brane on AdS_4 x
S^7/ Z_k and consider semiclassical fluctuaitions around a static, 1/2 BPS
configuration whose shape is AdS_2 x S^1. The internal manifold S^7/ Z_k is
described as a U(1) fibration over CP^3 and the static configuration is wrapped
on the U(1) fiber. Then the configuration is reduced to an AdS_2 world-sheet of
type IIA string on AdS_4 x CP^3 through the Kaluza-Klein reduction on the S^1.
It is shown that the fluctuations form an infinite set of N=1 supermultiplets
on AdS_2, for k=1,2. The set is invariant under SO(8) which may be consistent
with N=8 supersymmetry on AdS_2. We discuss the behavior of the fluctuations
around the boundary of AdS_2 and its relation to deformations of Wilson loop
operator.Comment: 27 pages, v2: references added, v3: major revision including the
clarification of k=2 case, references added, version to appear in JHE | Semiclassical Analysis of M2-brane in AdS_4 x S^7 / Z_k | semiclassical analysis of m2-brane in ads_4 x s^7 / z_k | describing brane semiclassical fluctuaitions manifold fibration wrapped fiber. sheet kaluza klein infinite supermultiplets supersymmetry deformations wilson pages revision clarification | non_dup | [] |
2153894 | 10.1007/JHEP12(2010)013 | We present an algorithm for the numerical calculation of one-loop QCD
amplitudes. The algorithm consists of subtraction terms, approximating the
soft, collinear and ultraviolet divergences of one-loop amplitudes and a method
to deform the integration contour for the loop integration into the complex
space. The algorithm is formulated at the amplitude level and does not rely on
Feynman graphs. Therefore all required ingredients can be calculated
efficiently using recurrence relations. The algorithm applies to massless
partons as well as to massive partons.Comment: 62 pages, version to be publishe | Numerical NLO QCD calculations | numerical nlo qcd calculations | amplitudes. subtraction approximating collinear ultraviolet divergences amplitudes deform contour space. formulated rely feynman graphs. ingredients efficiently recurrence relations. applies massless partons massive pages publishe | non_dup | [] |
2143172 | 10.1007/JHEP12(2010)014 | We analyse semiclassical strings in AdS in the limit of one large spin. In
this limit, classical string dynamics is described by a finite number of
collective coordinates corresponding to spikes or cusps of the string. The
semiclassical spectrum consists of two branches of excitations corresponding to
"large" and "small" spikes respectively. We propose that these states are dual
to the excitations known as large and small holes in the spin chain description
of N=4 SUSY Yang-Mills. The dynamics of large spikes in classical string theory
can be mapped to that of a classical spin chain of fixed length. In turn, small
spikes correspond to classical solitons propagating on the background formed by
the large spikes. We derive the dispersion relation for these excitations
directly in the finite gap formalism.Comment: 36 pages, 9 figure | Spiky Strings and Giant Holes | spiky strings and giant holes | analyse semiclassical strings spin. collective spikes cusps string. semiclassical branches excitations spikes respectively. propose excitations holes susy mills. spikes mapped length. spikes solitons propagating spikes. derive excitations pages | non_dup | [] |
2137763 | 10.1007/JHEP12(2010)015 | We compare theoretical and experimental predictions of two main classes of
models addressing fermion mass hierarchies and flavour changing neutral
currents (FCNC) effects in supersymmetry: Froggatt-Nielsen (FN) U(1) gauged
flavour models and Nelson-Strassler/extra dimensional models with hierarchical
wave functions for the families. We show that whereas the two lead to identical
predictions in the fermion mass matrices, the second class generates a stronger
suppression of FCNC effects. We prove that, whereas at first sight the FN setup
is more constrained due to anomaly cancelation conditions, imposing unification
of gauge couplings in the second setup generates conditions which precisely
match the mixed anomaly constraints in the FN setup. Finally, we provide an
economical extra dimensional realisation of the hierarchical wave functions
scenario in which the leptonic FCNC can be efficiently suppressed due to the
strong coupling (CFT) origin of the electron mass.Comment: 23 page | Flavour in supersymmetry: horizontal symmetries or wave function
renormalisation | flavour in supersymmetry: horizontal symmetries or wave function renormalisation | addressing fermion hierarchies flavour changing neutral currents fcnc supersymmetry froggatt nielsen gauged flavour nelson strassler extra hierarchical families. fermion generates stronger suppression fcnc effects. sight setup constrained anomaly cancelation imposing unification couplings setup generates precisely match anomaly setup. economical extra realisation hierarchical leptonic fcnc efficiently suppressed | non_dup | [] |
2142362 | 10.1007/JHEP12(2010)016 | We study compactifications of eleven-dimensional supergravity on Calabi-Yau
threefolds times a circle, with a duality twist along the circle a la
Scherk-Schwarz. This leads to four-dimensional N=2 gauged supergravity with a
semi-positive definite potential for the scalar fields, which we derive
explicitly. Furthermore, inspired by the orientifold projection in string
theory, we define a truncation to N=1 supergravity. We determine the D-terms,
Kaehler- and superpotentials for these models and study the properties of the
vacua. Finally, we point out a relation to M-theory compactifications on
seven-dimensional manifolds with G2 structure.Comment: 42 pages; v2: typo correcte | New potentials from Scherk-Schwarz reductions | new potentials from scherk-schwarz reductions | compactifications eleven supergravity calabi threefolds circle duality twist circle scherk schwarz. gauged supergravity definite derive explicitly. inspired orientifold projection truncation supergravity. kaehler superpotentials vacua. compactifications seven manifolds pages typo correcte | non_dup | [] |
2144467 | 10.1007/JHEP12(2010)017 | We numerically study the dual field theory evolution of five-dimensional
asymptotically anti-de Sitter solutions of supergravity that develop
cosmological singularities. The dual theory is an unstable deformation of the N
= 4 gauge theory on R $\times$ S3, and the big crunch singularity in the bulk
occurs when a boundary scalar field runs to infinity. Consistent quantum
evolution requires one imposes boundary conditions at infinity. Modeling these
by a steep regularization of the scalar potential, we find that when an
initially nearly homogeneous wavepacket rolls down the potential, most of the
potential energy of the initial configuration is converted into gradient energy
during the first oscillation of the field. This indicates there is no
transition from a big crunch to a big bang in the bulk for dual boundary
conditions of this kind.Comment: 20 pages, 6 figure | Particle Production near an AdS Crunch | particle production near an ads crunch | numerically asymptotically sitter supergravity cosmological singularities. unstable deformation crunch singularity runs infinity. imposes infinity. steep regularization initially nearly homogeneous wavepacket rolls converted oscillation field. crunch bang pages | non_dup | [] |
2145700 | 10.1007/JHEP12(2010)018 | We propose that the complete planar S-matrix of N=4 super Yang-Mills -
including all N^kMHV partial amplitudes to all loops - is equivalent to the
correlation function of a supersymmetric Wilson loop in twistor space.
Remarkably, the entire classical S-matrix arises from evaluating the
correlation function in the self-dual sector, while the expansion of the
correlation function in powers of the Yang-Mills coupling constant provides the
loop expansion of the amplitudes. We support our proposal with explicit
computations of the n particle NMHV and NNMHV trees, the integrands of the
1-loop MHV and NMHV amplitudes, and the n particle 2-loop MHV amplitude. These
calculations are performed using the twistor action in axial gauge. In this
gauge, the Feynman diagrams of the correlation function are the planar duals of
the usual MHV diagrams for the scattering amplitude. The results are presented
in the form of a sum of products of dual superconformal invariants in
(momentum) twistor space, and agree with the expressions derived in
arXiv:1009.1854 directly from the MHV rules. The twistor space Wilson loop is a
natural supersymmetric generalization of the standard Wilson loop used to
compute MHV amplitudes. We show how the Penrose-Ward transform can be used to
determine a corresponding supersymmetrization on space-time.Comment: 36 pages, 10 figures. Substantial clarification added to section | The Complete Planar S-matrix of N=4 SYM as a Wilson Loop in Twistor
Space | the complete planar s-matrix of n=4 sym as a wilson loop in twistor space | propose planar super mills kmhv amplitudes loops supersymmetric wilson twistor space. remarkably arises evaluating powers mills amplitudes. proposal computations nmhv nnmhv trees integrands nmhv amplitudes amplitude. twistor axial gauge. feynman diagrams planar duals usual diagrams amplitude. superconformal invariants twistor agree expressions rules. twistor wilson supersymmetric generalization wilson amplitudes. penrose ward transform supersymmetrization pages figures. substantial clarification | non_dup | [] |
2150399 | 10.1007/JHEP12(2010)019 | If the minimal supersymmetric standard model is the solution to the hierarchy
problem, the scalar top quark (stop) and the Higgsino should weigh around the
electroweak scale such as 200 GeV. A low messenger scale, which results in a
light gravitino, is also suggested to suppress the quantum corrections to the
Higgs mass parameters. Therefore the minimal model for natural supersymmetry is
a system with stop/Higgsino/gravitino whereas other superparticles are heavy.
We study the LHC signatures of the minimal system and discuss the discovery
potential and methods for the mass measurements.Comment: 19 pages, 6 figures, 1 tabl | Natural Supersymmetry at the LHC | natural supersymmetry at the lhc | supersymmetric hierarchy stop higgsino weigh electroweak gev. messenger gravitino suppress parameters. supersymmetry stop higgsino gravitino superparticles heavy. signatures discovery pages tabl | non_dup | [] |
2145621 | 10.1007/JHEP12(2010)020 | We consider lattice field theories with topological actions, which are
invariant against small deformations of the fields. Some of these actions have
infinite barriers separating different topological sectors. Topological actions
do not have the correct classical continuum limit and they cannot be treated
using perturbation theory, but they still yield the correct quantum continuum
limit. To show this, we present analytic studies of the 1-d O(2) and O(3)
model, as well as Monte Carlo simulations of the 2-d O(3) model using
topological lattice actions. Some topological actions obey and others violate a
lattice Schwarz inequality between the action and the topological charge Q.
Irrespective of this, in the 2-d O(3) model the topological susceptibility
\chi_t = \l< Q^2 >/V is logarithmically divergent in the continuum limit.
Still, at non-zero distance the correlator of the topological charge density
has a finite continuum limit which is consistent with analytic predictions. Our
study shows explicitly that some classically important features of an action
are irrelevant for reaching the correct quantum continuum limit.Comment: 38 pages, 12 figure | Topological Lattice Actions | topological lattice actions | topological deformations fields. infinite barriers separating topological sectors. topological continuum perturbation continuum limit. analytic monte carlo topological actions. topological obey violate schwarz inequality topological irrespective topological susceptibility logarithmically divergent continuum limit. correlator topological continuum analytic predictions. explicitly classically irrelevant reaching continuum pages | non_dup | [] |
2146249 | 10.1007/JHEP12(2010)021 | We study a strongly coupled $Z_2$ lattice gauge theory with two flavors of
quarks, invariant under an exact $\mathrm{SU}(2)\times \mathrm{SU}(2) \times
\mathrm{U}_A(1) \times \mathrm{U}_B(1)$ symmetry which is the same as QCD with
two flavors of quarks without an anomaly. The model also contains a coupling
that can be used to break the $\mathrm{U}_A(1)$ symmetry and thus mimic the QCD
anomaly. At low temperatures $T$ and small baryon chemical potential $\mu_B$
the model contains massless pions and massive bosonic baryons similar to QCD
with an even number of colors. In this work we study the $T-\mu_B$ phase
diagram of the model and show that it contains three phases : (1) A chirally
broken phase at low $T$ and $\mu_B$, (2) a chirally symmetric baryon superfluid
phase at low $T$ and high $\mu_B$, and (3) a symmetric phase at high $T$. We
find that the nature of the finite temperature chiral phase transition and in
particular the location of the tricritical point that seperates the first order
line from the second order line is affected significantly by the anomaly.Comment: 22 pages, 16 figures, 5 tables, references adde | Anomaly and a QCD-like phase diagram with massive bosonic baryons | anomaly and a qcd-like phase diagram with massive bosonic baryons | flavors quarks mathrm mathrm mathrm mathrm flavors quarks anomaly. break mathrm mimic anomaly. baryon massless pions massive bosonic baryons colors. chirally broken chirally baryon superfluid chiral tricritical seperates pages tables adde | non_dup | [] |
2143040 | 10.1007/JHEP12(2010)022 | We report on the results of numerical simulations of 1+1 dimensional SU(N)
Yang-Mills theory with maximal supersymmetry at finite temperature and
compactified on a circle. For large N this system is thought to provide a dual
description of the decoupling limit of N coincident D1-branes on a circle. It
has been proposed that at large N there is a phase transition at strong
coupling related to the Gregory-Laflamme (GL) phase transition in the
holographic gravity dual. In a high temperature limit there was argued to be a
deconfinement transition associated to the spatial Polyakov loop, and it has
been proposed that this is the continuation of the strong coupling GL
transition. Investigating the theory on the lattice for SU(3) and SU(4) and
studying the time and space Polyakov loops we find evidence supporting this. In
particular at strong coupling we see the transition has the parametric
dependence on coupling predicted by gravity. We estimate the GL phase
transition temperature from the lattice data which, interestingly, is not yet
known directly in the gravity dual. Fine tuning in the lattice theory is
avoided by the use of a lattice action with exact supersymmetry.Comment: 21 pages, 8 figures. v2: References added, two figures were modified
for clarity. v3: Normalisation of lattice coupling corrected by factor of two
resulting in change of estimate for c_cri | Thermal phases of D1-branes on a circle from lattice super Yang-Mills | thermal phases of d1-branes on a circle from lattice super yang-mills | mills maximal supersymmetry compactified circle. thought decoupling coincident branes circle. gregory laflamme holographic dual. argued deconfinement polyakov continuation transition. investigating studying polyakov loops supporting this. parametric gravity. interestingly dual. fine tuning avoided pages figures. clarity. normalisation corrected | non_dup | [] |
2144227 | 10.1007/JHEP12(2010)024 | We calculate the grand canonical partition function at the one-loop level for
scalar quantum electrodynamics at finite temperature and chemical potential. A
classical background charge density with a charge opposite that of the scalars
ensures the neutrality of the system. For low density systems we find evidence
of a first order phase transition. We find upper and lower bounds on the
transition temperature below which the charged scalars form a condensate. A
first order phase transition may have consequences for helium-core white dwarf
stars in which it has been argued that such a condensate of charged helium-4
nuclei could exist.Comment: 20 pages, 3 figures. Version accepted for publication in JHE | Phase Transitions of Charged Scalars at Finite Temperature and Chemical
Potential | phase transitions of charged scalars at finite temperature and chemical potential | grand canonical partition electrodynamics potential. opposite scalars ensures neutrality system. transition. bounds scalars condensate. consequences helium dwarf argued condensate helium nuclei pages figures. publication | non_dup | [] |