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1937819 | 10.1007/JHEP10(2013)060 | We find non-supersymmetric metastable vacua in four dimensional N=2 gauge
theories softly broken to N=1 by a superpotential term. First we study the
simplest case, namely the SU(2) gauge theory without flavors. We study the
spectrum and lifetime of the metastable vacuum and possible embeddings of the
model in UV complete theories. Then we consider larger gauge group theories
with flavors. We show that when we softly break them to N=1, the potential
induced on specific submanifolds of their moduli space is identical to the
potential in lower rank gauge theories. Then we show that the potential
increases when we move away from this submanifold, allowing us to construct
metastable vacua on them in the theories that can be reduced to the SU(2) case.Comment: 29 pages, 10 figure | Non Supersymmetric Metastable Vacua in N=2 SYM Softly Broken to N=1 | non supersymmetric metastable vacua in n=2 sym softly broken to n=1 | supersymmetric metastable vacua softly broken superpotential term. simplest flavors. lifetime metastable embeddings theories. flavors. softly break submanifolds moduli theories. move away submanifold allowing metastable vacua pages | non_dup | [] |
6207669 | 10.1007/JHEP10(2013)065 | We provide the metric, the gravitino fields and the gauge fields to all
orders in the fermionic zero modes for D=5 and D=4, N=2 gauged supergravity
solutions starting from non-extremal AdS--Schwarzschild black holes. We compute
the Brown-York stress--energy tensor on the boundary of AdS_5 / AdS_4 spaces
and we discuss some implications of the fermionic corrections to perfect fluid
interpretation of the boundary theory. The complete non-linear solution, which
we denote as fermionic wig, is achieved by acting with supersymmetry
transformations upon the supergravity fields and that expansion naturally
truncates at some order in the fermionic zero modes.Comment: 27 pages, Latex2e, no figures, 3 ancillary file | Fermionic Wigs for AdS-Schwarzschild Black Holes | fermionic wigs for ads-schwarzschild black holes | gravitino orders fermionic gauged supergravity extremal schwarzschild holes. brown fermionic perfect theory. fermionic acting supersymmetry transformations supergravity naturally truncates fermionic pages latex ancillary file | non_dup | [] |
24953633 | 10.1007/JHEP10(2013)066 | We study worldsheet scattering for the type IIA superstring in AdS(2) x S(2)
x T(6). Using the Green--Schwarz action to quartic order in fermions we take
the near-BMN limit, where as in the AdS(3)/CFT(2) case there are both massive
and massless excitations. For the massive excitations we compute all possible
tree-level processes, and show that these agree with a truncated version of the
exact AdS(5) x S(5) S-matrix. We also compute several S-matrix elements
involving massless excitations. At one loop we find that the dressing phase is
the same Hernandes-Lopez phase appearing in AdS(5)/CFT(4). We see the same
phase when calculating this by semiclassical means using the PSU(1,1|2)/U(1)^2
coset sigma model, for which we can also study the scattering of fermions. This
supports the conjecture that the all-loop dressing phase is again the BES
phase, rather than a new phase like that seen in AdS(3)/CFT(2).Comment: 21 pages. v2 corrects one sign error; version to appear in JHE | Scattering in AdS(2)/CFT(1) and the BES Phase | scattering in ads(2)/cft(1) and the bes phase | worldsheet superstring schwarz quartic fermions massive massless excitations. massive excitations agree truncated matrix. involving massless excitations. dressing hernandes lopez appearing calculating semiclassical coset sigma fermions. supports conjecture dressing .comment pages. corrects | non_dup | [] |
24945172 | 10.1007/JHEP10(2013)068 | Baryonic R-parity violation could explain why low-scale supersymmetry has not
yet been discovered at colliders: sparticles would be hidden in the intense
hadronic activity. However, if the known flavor structures are any guide, the
largest baryon number violating couplings are those involving the top/stop, so
a copious production of same-sign top-quark pairs is in principle possible.
Such a signal, with its low irreducible background and efficient identification
through same-sign dileptons, provides us with tell-tale signs of baryon number
violating supersymmetry. Interestingly, this statement is mostly independent of
the details of the supersymmetric mass spectrum. So, in this paper, after
analyzing the sparticle decay chains and lifetimes, we formulate a simplified
benchmark strategy that covers most supersymmetric scenarios. We then use this
information to interpret the same-sign dilepton searches of CMS, draw
approximate bounds on the gluino and squark masses, and extrapolate the reach
of the future 14 TeV runs.Comment: 32 pages, 12 figures, 3 tables, 1 appendi | The same-sign top signature of R-parity violation | the same-sign top signature of r-parity violation | baryonic parity violation supersymmetry discovered colliders sparticles hidden intense hadronic activity. flavor guide baryon violating couplings involving stop copious possible. irreducible dileptons tell tale signs baryon violating supersymmetry. interestingly statement mostly supersymmetric spectrum. analyzing sparticle chains lifetimes formulate simplified benchmark covers supersymmetric scenarios. interpret dilepton searches draw approximate bounds gluino squark extrapolate pages tables appendi | non_dup | [] |
24932353 | 10.1007/JHEP10(2013)069 | In this note we provide a new construction of BCJ dual-trace factor using the
kinematic algebra proposed in arXiv:1105.2565 and arXiv:1212.6168. Different
from the construction given in arXiv:1304.2978 based on the proposal of
arXiv:1103.0312, the method used in this note exploits the adjoint
representation of kinematic algebra and the use of inner product in dual space.
The dual-trace factor defined in this way naturally satisfies cyclic symmetry
condition but not KK-relation, just like the trace of U(N) Lie algebra
satisfies cyclic symmetry condition, but not KK-relation. In other words the
new construction naturally leads to formulation sharing more similarities with
the color decomposition of Yang-Mills amplitude.Comment: 15 pages, improved versio | Note on Construction of Dual-trace Factor in Yang-Mills Theory | note on construction of dual-trace factor in yang-mills theory | trace kinematic proposal exploits adjoint kinematic space. trace naturally satisfies cyclic trace satisfies cyclic relation. naturally formulation sharing similarities decomposition mills pages versio | non_dup | [] |
24952594 | 10.1007/JHEP10(2013)071 | We analyse slow-roll inflationary cosmologies that are holographically dual
to a three-dimensional conformal field theory deformed by a nearly marginal
scalar operator. We show the cosmological power spectrum is inversely
proportional to the spectral density associated with the 2-point function of
the trace of the stress tensor in the deformed CFT. Computing this quantity
using second-order conformal perturbation theory, we obtain a holographic power
spectrum in exact agreement with the expected inflationary power spectrum to
second order in slow roll.Comment: 26 pp, 4 fig | On the power spectrum of inflationary cosmologies dual to a deformed CFT | on the power spectrum of inflationary cosmologies dual to a deformed cft | analyse slow roll inflationary cosmologies holographically conformal deformed nearly marginal operator. cosmological inversely trace deformed cft. quantity conformal perturbation holographic inflationary slow | non_dup | [] |
24951342 | 10.1007/JHEP10(2013)072 | Current CERN Large Hadron Collider data on the 126 GeV standard model-like
Higgs boson suggest the possibility of larger Higgs boson couplings with the
weak gauge bosons, $g_{hVV}$, than those in the standard model. We use the
Georgi-Machacek model as an explicit model to realize such a scenario. We find
that the $g_{hVV}$ couplings can be larger than the standard model value by a
factor of about 1.3 maximally in the parameter region consistent with the
current Higgs boson search data and allowed by various other constraints. We
then show how the modified $g_{hVV}$ couplings lead to enhancements in various
weak boson scattering processes. This can be clearly observed as excesses in
the transverse mass distributions at around 126 GeV and also the mass of heavy
Higgs bosons.Comment: 18 pages, 14 figure | Enhancements of weak gauge boson scattering processes at the CERN LHC | enhancements of weak gauge boson scattering processes at the cern lhc | cern hadron collider boson boson couplings bosons model. georgi machacek realize scenario. couplings maximally boson constraints. couplings enhancements boson processes. excesses pages | non_dup | [] |
24938078 | 10.1007/JHEP10(2013)073 | Using the off-shell formulation for N-extended conformal supergravity in
three dimensions, which has recently been presented in arXiv:1305.3132, we
construct superspace actions for conformal supergravity theories with N<6. For
each of the cases considered, we work out the complete component action as well
as the gauge transformation laws of the fields belonging to the Weyl
supermultiplet. The N=1 and N=2 component actions derived coincide with those
proposed by van Nieuwenhuizen and Rocek in the mid-1980s. The off-shell N=3,
N=4 and N=5 supergravity actions are new results. Upon elimination of the
auxiliary fields, these actions reduce to those constructed by Lindstrom and
Rocek in 1989 (and also by Gates and Nishino in 1993).Comment: 47 pages; v2: published versio | Conformal supergravity in three dimensions: Off-shell actions | conformal supergravity in three dimensions: off-shell actions | formulation conformal supergravity superspace conformal supergravity laws belonging weyl supermultiplet. coincide nieuwenhuizen rocek supergravity results. elimination auxiliary lindstrom rocek gates nishino .comment pages versio | non_dup | [] |
24943724 | 10.1007/JHEP10(2013)076 | The Riemann curvature correction to the type II supergravity at
eight-derivative level is given schematically as
$(t_8t_8+{1}{8}\eps_{10}\eps_{10})R^4$ at tree-level. The replacement of the
generalized Riemann curvature in $t_8t_8R^4$, proposed by Gross and Sloan,
produces various NS-NS couplings which are invariant under T-duality. Recently,
using the combination of S-duality and T-duality transformations on these
couplings, we have found groups of couplings which are invariant under the
S-duality transformation. In this paper, we have examined the couplings
involving the dilaton with direct scattering amplitude calculations of four
NS-NS vertex operators in the superstring theory and found exact agreement.
The coupling $\eps_{10}\eps_{10}R^4$ is a total derivative term at four-field
level. The $\sigma$-model beta function approach implies the presence of this
term at the tree-level. By examining the sphere-level scattering amplitude of
five gravitons, we have also confirmed the presence of this term in the
tree-level effective action.Comment: 15 pages, Latex file, no figure; v4: the version appears in JHE | S-duality invariant dilaton couplings at order $\alpha'^3$ | s-duality invariant dilaton couplings at order $\alpha'^3$ | riemann curvature supergravity eight schematically level. replacement riemann curvature gross sloan produces couplings duality. duality duality transformations couplings couplings duality transformation. couplings involving dilaton superstring agreement. level. sigma beta level. examining sphere gravitons confirmed pages latex file | non_dup | [] |
24936295 | 10.1007/JHEP10(2013)077 | We show that the three-body decays of the resonance recently discovered at
the LHC are potentially sensitive to effects of new physics. Even if the fully
integrated partial decay widths are consistent with the minimal Standard Model
there is information that is lost upon integration, which can be uncovered in
the differential decay widths. Concentrating on the decay $h \to Z \ell
\bar{\ell}$, we identify the regions in the three-body phase space in which
these effects become especially pronounced and could be detected in future
experiments.Comment: 20 pages, 5 figures, matches version published in JHE | Searching for New Physics in the Three-Body Decays of the Higgs-like
Particle | searching for new physics in the three-body decays of the higgs-like particle | decays discovered potentially physics. widths lost uncovered widths. concentrating pronounced pages matches | non_dup | [] |
24947333 | 10.1007/JHEP10(2013)078 | We compute holographic entanglement entropy in two strongly coupled nonlocal
field theories: the dipole and the noncommutative deformations of SYM theory.
We find that entanglement entropy in the dipole theory follows a volume law for
regions smaller than the length scale of nonlocality and has a smooth
cross-over to an area law for larger regions. In contrast, in the
noncommutative theory the entanglement entropy follows a volume law for up to a
critical length scale at which a phase transition to an area law occurs. The
critical length scale increases as the UV cutoff is raised, which is indicative
of UV/IR mixing and implies that entanglement entropy in the noncommutative
theory follows a volume law for arbitrary large regions when the size of the
region is fixed as the UV cutoff is removed to infinity. Comparison of
behaviour between these two theories allows us to explain the origin of the
volume law. Since our holographic duals are not asymptotically AdS, minimal
area surfaces used to compute holographic entanglement entropy have novel
behaviours near the boundary of the dual spacetime. We discuss implications of
our results on the scrambling (thermalization) behaviour of these nonlocal
field theories.Comment: 26 pages, 9 figure | Holographic entanglement entropy in nonlocal theories | holographic entanglement entropy in nonlocal theories | holographic entanglement nonlocal dipole noncommutative deformations theory. entanglement dipole nonlocality regions. noncommutative entanglement occurs. cutoff raised indicative entanglement noncommutative cutoff removed infinity. law. holographic duals asymptotically holographic entanglement behaviours spacetime. scrambling thermalization nonlocal pages | non_dup | [] |
24956561 | 10.1007/JHEP10(2013)081 | We analyze the scalar sector properties of a general class of
two-Higgs-doublet models which has a global U(1) symmetry in the quartic terms.
We find constraints on the parameters of the potential from the considerations
of unitarity of scattering amplitudes, the global stability of the potential
and the $\rho$-parameter. We concentrate on the spectrum of the non-standard
scalar masses in the decoupling limit which is preferred by the Higgs data at
the LHC. We exhibit charged-Higgs induced contributions to the diphoton decay
width of the 125\,GeV Higgs boson and its correlation with the corresponding
$Z\gamma$ width.Comment: 12 pages, 15 eps figure files; minor modifications made and a few
references adde | Scalar sector properties of two-Higgs-doublet models with a global U(1)
symmetry | scalar sector properties of two-higgs-doublet models with a global u(1) symmetry | analyze doublet quartic terms. considerations unitarity amplitudes parameter. concentrate decoupling preferred lhc. exhibit diphoton boson gamma pages files minor modifications adde | non_dup | [] |
24950902 | 10.1007/JHEP10(2013)082 | The sudden injection of energy in a strongly coupled conformal field theory
and its subsequent thermalization can be holographically modeled by a shell
falling into anti-de Sitter space and forming a black brane. For a homogeneous
shell, Bhattacharyya and Minwalla were able to study this process analytically
using a weak field approximation. Motivated by event-by-event fluctuations in
heavy ion collisions, we include inhomogeneities in this model, obtaining
analytic results in a long wavelength expansion. In the early-time window in
which our approximations can be trusted, the resulting evolution matches well
with that of a simple free streaming model. Near the end of this time window,
we find that the stress tensor approaches that of second-order viscous
hydrodynamics. We comment on possible lessons for heavy ion phenomenology.Comment: 53 pages, 10 figures; v2: references adde | Inhomogeneous holographic thermalization | inhomogeneous holographic thermalization | sudden injection conformal thermalization holographically modeled falling sitter forming brane. homogeneous bhattacharyya minwalla analytically approximation. motivated collisions inhomogeneities obtaining analytic expansion. window approximations trusted matches streaming model. window viscous hydrodynamics. comment lessons pages adde | non_dup | [] |
24949330 | 10.1007/JHEP10(2013)084 | We use the relation between certain diffeomorphisms in the bulk and Weyl
transformations on the boundary to build the conformal structure of the metric
in the presence of matter in the bulk. We explicitly obtain the conformal
anomaly in any spacetime dimension d in a holographic frame work in the case of
gravity coupled to the scalar fields. This way we also provide a holographic
construction of the bulk spacetime metric and of the matter fields in the bulk
of this spacetime out of sources that are related to conformal field theory
data. With the latter, we produce an asymptotic expansion of the bulk fields
and scalar fields near the boundary in terms of spacetime dimension in the
context of the AdS/CFT correspondence. We work out both the gravitational and
matter conformal anomalies of the boundary theory as a coefficient of the
infrared logarithmic divergence that appears in the on-shell action.Comment: 39 pages, Latex file, no figure; v3: references added, to appear in
JHE | On Holographic Weyl Anomaly | on holographic weyl anomaly | diffeomorphisms weyl transformations build conformal bulk. explicitly conformal anomaly spacetime holographic fields. holographic spacetime spacetime conformal data. asymptotic spacetime correspondence. gravitational conformal anomalies infrared logarithmic divergence pages latex file | non_dup | [] |
24944603 | 10.1007/JHEP10(2013)085 | We compute the expectation value of the 1/2 BPS circular Wilson loop operator
in ABJ(M) theory at two loops in perturbation theory. Our result turns out to
be in exact agreement with the weak coupling limit of the prediction coming
from localization, including finite N contributions associated to non-planar
diagrams. It also confirms the identification of the correct framing factor
that connects framing-zero and framing-one expressions, previously proposed.
The evaluation of the 1/2 BPS operator is made technically difficult in
comparison with other observables of ABJ(M) theory by the appearance of
integrals involving the coupling between fermions and gauge fields, which are
absent for instance in the 1/6 BPS case. We describe in detail how to
analytically solve these integrals in dimensional regularization with
dimensional reduction (DRED). By suitably performing the physical limit to
three dimensions we clarify the role played by short distance divergences on
the final result and the mechanism of their cancellation.Comment: 54 pages, 2 figure | The 1/2 BPS Wilson loop in ABJ(M) at two loops: The details | the 1/2 bps wilson loop in abj(m) at two loops: the details | expectation circular wilson loops perturbation theory. turns coming localization planar diagrams. confirms framing connects framing framing expressions proposed. technically observables appearance integrals involving fermions absent case. analytically solve integrals regularization dred suitably performing clarify played divergences pages | non_dup | [] |
24951815 | 10.1007/JHEP10(2013)088 | It is shown that substantially enhanced Higgs to diphoton rate induced by
light staus with large left-right mixing in MSSM requires at the GUT scale
non-universal gaugino masses with bino and/or wino lighter than gluino. The
possibility of such enhancement is investigated in MSSM models with arbitrary
gaugino masses at the GUT scale with additional restriction of top-bottom-tau
Yukawa unification, as predicted by minimal SO(10) GUTs. Many patterns of
gaugino masses leading to enhanced Higgs to diphoton rate and the Yukawa
unification are identified. Some of these patterns can be accommodated in a
well-motivated scenarios such as mirage mediation or SUSY breaking F-terms
being a non-singlet of SO(10). Phenomenological implications of a scenario with
non-universal gaugino masses generated by a mixture of the singlet F-term and
the F-term in a 24-dimensional representation of SU(5) $\subset$ SO(10) are
studied in detail. Possible non-universalities of other soft terms generated by
such F-terms are discussed. The enhancement of Higgs to diphoton rate up to 30%
can be obtained in agreement with all phenomenological constraints, including
vacuum metastability bounds. The lightest sbottom and pseudoscalar Higgs are
within easy reach of the 14 TeV LHC. The LSP can be either bino-like or
wino-like. The thermal relic abundance in the former case may be in agreement
with the cosmological data thanks to efficient stau coannihilation.Comment: 28 pages, 8 figures, comments and references added, matches published
versio | Light staus and enhanced Higgs diphoton rate with non-universal gaugino
masses and SO(10) Yukawa unification | light staus and enhanced higgs diphoton rate with non-universal gaugino masses and so(10) yukawa unification | substantially diphoton staus mssm universal gaugino bino wino lighter gluino. enhancement mssm gaugino restriction yukawa unification guts. gaugino diphoton yukawa unification identified. accommodated motivated scenarios mirage mediation susy breaking singlet phenomenological universal gaugino mixture singlet detail. universalities discussed. enhancement diphoton phenomenological metastability bounds. lightest sbottom pseudoscalar lhc. bino wino like. relic abundance former cosmological thanks stau pages comments matches versio | non_dup | [] |
24941403 | 10.1007/JHEP10(2013)091 | We study the $Y=0$ triplet extended supersymmetric model in the light of the
recent Higgs boson discovery. We calculate full one loop Higgs mass spectrum in
this model where the possible doublet-triplet mixing is considered in the
charged Higgs sector. This mixing changes the prediction of
$\mathcal{B}r(B_s\to X_s \gamma)$ in this model, compared to the MSSM. The
constraints from the $\sim 125$ GeV Higgs along with $\mathcal{B}r(B_s\to X_s
\gamma)$ are incorporated to find out the allowed parameter space. The lower
bounds on the third generation squark masses coming from 125 GeV Higgs are
rather week in this scenario compared to most constrained supersymmetric
scenarios, e.g. a 200 GeV squark mass is still possible.Comment: 25 pages, 32 figures, JHEP styl | Status of $Y=0$ Triplet Higgs with supersymmetry in the light of $\sim
125$ GeV Higgs discovery | status of $y=0$ triplet higgs with supersymmetry in the light of $\sim 125$ gev higgs discovery | triplet supersymmetric boson discovery. doublet triplet sector. mathcal gamma mssm. mathcal gamma incorporated space. bounds squark coming week constrained supersymmetric scenarios e.g. squark pages jhep styl | non_dup | [] |
24946920 | 10.1007/JHEP10(2013)092 | We argue that in large classes of string compactifications with a MSSM-like
structure substantial flavor violating SUSY-breaking soft terms are generically
induced. We specify to the case of flavor dependent soft-terms in type
IIB/F-theory SU(5) unified models, although our results can be easily extended
to other settings. The Standard Model (SM) degrees of freedom reside in a local
system of 7-branes wrapping a 4-fold S in the extra dimensions. It is known
that in the presence of closed string 3-form fluxes SUSY-breaking terms are
typically generated. We explore the generation dependence of these soft terms
and find that non-universalities arise whenever the flux varies over the 4-fold
S. These non-universalities are parametrically suppressed by
(M_{GUT}/M_{Pl})^{1/3}. They also arise in the case of varying open string
fluxes, in this case parametrically suppressed by \alpha_{GUT}^{1/2}. For a
standard unification scheme with M_{GUT} = 10^{16} GeV and \alpha_{\rm GUT} =
1/24 these suppressions are very mild. Although limits from the kaon mass
difference \Delta m_K are easily obeyed for squark masses above the present LHC
limits, constraints from the CP-violation parameter \epsilon_K imply squark
masses in the multi-TeV region. The constraints from BR(\mu \rightarrow
e\gamma) turn out to be the strongest ones, with slepton masses of order ~10
TeV or heavier required to obey the experimental limits. These sfermion masses
are consistent with the observed large value m_H ~ 126 GeV of the Higgs mass.
We discuss under what conditions such strong limits may be relaxed allowing for
SUSY particle production at LHC.Comment: 38 pages, 6 figures, 1 table; v2: references adde | The String Origin of SUSY Flavor Violation | the string origin of susy flavor violation | argue compactifications mssm substantial flavor violating susy breaking generically induced. specify flavor unified settings. freedom reside branes wrapping extra dimensions. fluxes susy breaking generated. explore universalities arise whenever varies universalities parametrically suppressed arise fluxes parametrically suppressed alpha unification alpha suppressions mild. kaon delta obeyed squark violation epsilon imply squark region. rightarrow gamma strongest slepton heavier obey limits. sfermion mass. relaxed allowing susy pages adde | non_dup | [] |
24947581 | 10.1007/JHEP10(2013)093 | We explore the constraints on the parameter space of a Randall-Sundrum warped
geometry scenario, where a radion field arises out of the attempt to stabilise
the radius of the extra compact spacelike dimension, using the most recent data
from higgs searches at the Large Hadron Collider (LHC) and the Tevatron. We
calculate contributions from both the scalar mass eigenstates arising from
radion-higgs kinetic mixing in all important search channels. The most
important channel to be affected is the decay via WW*, where no invariant mass
peak can discern the two distinct physical states. Improving upon the previous
studies, we perform a full analysis in the WW* channel, taking into account the
effect of various cuts and interference when the two scalar are closely spaced.
We examine both cases where the experimentally discovered scalar is either
'higgs-like' or 'radion-like'. The implications of a relatively massive scalar
decaying into a pair of 125 GeV scalars is also included. Based on a global
analysis of the current data, including not only a single 125 GeV scalar but
also another one with mass over the range 110 to 600 GeV, we obtain the
up-to-date exclusion contours in the parameter space. Side by side, regions
agreeing with the data within 68% and 95% confidence level based on a
\chi^2-minimisation procedure, are also presented | An updated analysis of radion-higgs mixing in the light of LHC data | an updated analysis of radion-higgs mixing in the light of lhc data | explore randall sundrum warped radion arises attempt stabilise extra spacelike searches hadron collider tevatron. eigenstates arising radion channels. discern states. improving cuts interference closely spaced. examine experimentally discovered radion massive decaying scalars included. exclusion contours space. agreeing confidence minimisation | non_dup | [] |
24945902 | 10.1007/JHEP10(2013)094 | AdS_3 solutions dual to N = (0,2) SCFTs arise when D3-branes wrap Kahler
two-cycles in manifolds with SU(4) holonomy. Here we review known AdS_3
solutions and identify the corresponding three-dimensional gauged
supergravities, solutions of which uplift to type IIB supergravity. In
particular, we discuss gauged supergravities dual to twisted compactifications
on Riemann surfaces of both N=4 SYM and N =1 SCFTs with Sasaki-Einstein duals.
We check in each case that c-extremization gives the exact central charge and R
symmetry. For completeness, we also study AdS_3 solutions from intersecting
D3-branes, generalise recent KK reductions of Detournay & Guica and identify
the underlying gauged supergravities. Finally, we discuss examples of
null-warped AdS_3 solutions to three-dimensional gauged supergravity, all of
which embed in string theory.Comment: v1 48 pages; v2 two references added, to appear in JHE | 3D Supergravity from wrapped D3-branes | 3d supergravity from wrapped d3-branes | scfts arise branes wrap kahler cycles manifolds holonomy. gauged supergravities uplift supergravity. gauged supergravities twisted compactifications riemann scfts sasaki einstein duals. check extremization symmetry. completeness intersecting branes generalise reductions detournay guica gauged supergravities. warped gauged supergravity embed pages | non_dup | [] |
24950664 | 10.1007/JHEP10(2013)095 | We consider supersymmetric gauge theories on Riemannian three-manifolds with
the topology of a three-sphere. The three-manifold is always equipped with an
almost contact structure and an associated Reeb vector field. We show that the
partition function depends only on this vector field, giving an explicit
expression in terms of the double sine function. In the large N limit our
formula agrees with a recently discovered two-parameter family of dual
supergravity solutions. We also explain how our results may be applied to prove
vortex-antivortex factorization. Finally, we comment on the extension of our
results to three-manifolds with non-trivial fundamental group.Comment: 34 pages; v2: discussion of vortex factorization added; v3: minor
correction | Localization on Three-Manifolds | localization on three-manifolds | supersymmetric riemannian manifolds topology sphere. manifold equipped reeb field. partition giving sine function. agrees discovered supergravity solutions. vortex antivortex factorization. comment manifolds trivial pages vortex factorization minor | non_dup | [] |
24939096 | 10.1007/JHEP10(2013)096 | The full, explicit, scale dependence of the inclusive N3LO cross section for
single Higgs hadroproduction is obtained by calculating the convolutions of
collinear splitting kernels with lower-order partonic cross sections. We
provide results for all convolutions of splitting kernels and lower-order
partonic cross sections to the order in epsilon needed for the full N3LO
computation, as well as their expansions around the soft limit. We also discuss
the size of the total scale uncertainty at N3LO that can be anticipated with
existing information.Comment: 27 pages, 8 figure, 1 table, 8 ancillary files. v2: added 4
references, changed labelling of contour plot | Scale dependence and collinear subtraction terms for Higgs production in
gluon fusion at N3LO | scale dependence and collinear subtraction terms for higgs production in gluon fusion at n3lo | inclusive hadroproduction calculating convolutions collinear splitting kernels partonic sections. convolutions splitting kernels partonic epsilon expansions limit. anticipated pages ancillary files. changed labelling contour | non_dup | [] |
24952778 | 10.1007/JHEP10(2013)097 | We consider heterotic strings on a warped Eguchi-Hanson space with five-brane
and line bundle gauge fluxes. The heterotic string admits an exact CFT
description in terms of an asymmetrically gauged SU(2)xSL(2,R) WZW model, in a
specific double scaling limit in which the blow-up radius and the string scale
are sent to zero simultaneously. This allows us to compute the perturbative 6D
spectra for these models in two independent fashions: i) Within the
supergravity approximation we employ a representation dependent index; ii) In
the double scaling limit we determine all marginal vertex operators of the
coset CFT. To achieve agreement between the supergravity and the CFT spectra,
we conjecture that the untwisted and the twisted CFT states correspond to the
same set of hyper multiplets in supergravity. This is in a similar spirit as a
conjectured duality between asymptotically linear dilaton CFTs and little
string theory living on NS-five-branes. As the five-brane charge is
non-vanishing, heterotic (anti-)five-branes have to be added in order to cancel
irreducible gauge anomalies. The local spectra can be combined in such a way
that supersymmetry is preserved on the compact resolved T^4/Z_2 orbifold by
choosing the local gauge fluxes appropriately.Comment: 1+36 pages LaTe | Heterotic warped Eguchi-Hanson spectra with five-branes and line bundles | heterotic warped eguchi-hanson spectra with five-branes and line bundles | heterotic strings warped eguchi hanson brane bundle fluxes. heterotic admits asymmetrically gauged blow sent simultaneously. perturbative fashions supergravity employ marginal coset cft. supergravity conjecture untwisted twisted hyper multiplets supergravity. spirit conjectured duality asymptotically dilaton cfts living branes. brane vanishing heterotic branes cancel irreducible anomalies. supersymmetry preserved resolved orbifold choosing fluxes pages | non_dup | [] |
24960703 | 10.1007/JHEP10(2013)098 | Efficient methods for describing non abelian charges in worldline approaches
to QFT are useful to simplify calculations and address structural properties,
as for example color/kinematics relations. Here we analyze in detail a method
for treating arbitrary non abelian charges. We use Grassmann variables to take
into account color degrees of freedom, which however are known to produce
reducible representations of the color group. Then we couple them to a U(1)
gauge field defined on the worldline, together with a Chern-Simons term, to
achieve projection on an irreducible representation. Upon gauge fixing there
remains a modulus, an angle parametrizing the U(1) Wilson loop, whose
dependence is taken into account exactly in the propagator of the Grassmann
variables. We test the method in simple examples, the scalar and spin 1/2
contribution to the gluon self energy, and suggest that it might simplify the
analysis of more involved amplitudes.Comment: 14 page | Particles with non abelian charges | particles with non abelian charges | describing abelian charges worldline simplify kinematics relations. analyze treating abelian charges. grassmann freedom reducible representations group. couple worldline chern simons projection irreducible representation. fixing modulus parametrizing wilson propagator grassmann variables. gluon simplify | non_dup | [] |
24940669 | 10.1007/JHEP10(2013)099 | Supersymmetric terms in the effective action of N=2 supergravity in four
dimensions are generically classified into chiral-superspace integrals and
full-superspace integrals. For a theory of N=2 vector multiplets coupled to
supergravity, a special class of couplings is given by chiral-superspace
integrals that are governed by a holomorphic prepotential function. The quantum
entropy of BPS black holes in such theories depends on the prepotential
according to a known integral formula. We show, using techniques of
localization, that a large class of full-superspace integrals in the effective
action of N=2 supergravity do not contribute to the quantum entropy of BPS
black holes at any level in the derivative expansion. Our work extends similar
results for semi-classical supersymmetric black hole entropy, and goes towards
providing an explanation of why the prepotential terms capture the exact
microscopic quantum black hole entropy.Comment: 22 page | Quantum black hole entropy and the holomorphic prepotential of N=2
supergravity | quantum black hole entropy and the holomorphic prepotential of n=2 supergravity | supersymmetric supergravity generically classified chiral superspace integrals superspace integrals. multiplets supergravity couplings chiral superspace integrals governed holomorphic prepotential function. holes prepotential formula. localization superspace integrals supergravity holes expansion. extends supersymmetric goes explanation prepotential capture microscopic | non_dup | [] |
24946086 | 10.1007/JHEP10(2013)100 | We explore an extended coupling constant space of 4d regularized Euclidean
quantum gravity, defined via the formalism of dynamical triangulations. We add
a measure term which can also serve as a generalized higher curvature term and
determine the phase diagram and the geometries dominating in the various
regions. A first order phase transition line is observed, but no second order
transition point is located. As a consequence we cannot attribute any continuum
physics interpretation to the so-called crinkled phase of 4d dynamical
triangulations.Comment: 24 pages and many figures. A few references added in v | Euclidian 4d quantum gravity with a non-trivial measure term | euclidian 4d quantum gravity with a non-trivial measure term | explore regularized euclidean formalism triangulations. serve curvature geometries dominating regions. located. attribute continuum crinkled pages figures. | non_dup | [] |
24943784 | 10.1007/JHEP10(2013)101 | Out-of-equilibrium fermions can be created in the early Universe by
non-perturbative parametric effects, both at preheating or during the thermal
era. An anisotropic stress is developed in the fermion distribution, acting as
a source of a stochastic background of gravitational waves (GW). We derive a
general formalism to calculate the spectrum of GW produced by an ensemble of
fermions, which we apply to a variety of scenarios after inflation. We discuss
in detail the regularization of the source, i.e. of the unequal-time-correlator
of the fermions' transverse-traceless anisotropic stress. We discuss how the GW
spectrum builds up in time and present a simple parametrization of its final
amplitude and peak frequency. We find that fermions may generate a GW
background with a significant amplitude at very high frequencies, similarly to
the case of preheating with scalar fields. A detection of this GW background
would shed light about the physics of the very early Universe, but new
technology at high frequencies is required, beyond the range accessible to
currently planned detectors.Comment: 62 pages, 7 figures (updated to match published version in JHEP | Stochastic Background of Gravitational Waves from Fermions -- Theory and
Applications | stochastic background of gravitational waves from fermions -- theory and applications | fermions created universe perturbative parametric preheating era. anisotropic fermion acting stochastic gravitational derive formalism ensemble fermions scenarios inflation. regularization i.e. unequal correlator fermions traceless anisotropic stress. builds parametrization frequency. fermions preheating fields. shed universe accessible planned pages updated match jhep | non_dup | [] |
24936584 | 10.1007/JHEP10(2013)102 | If the kinetic interactions of a Lorentz-invariant massive graviton are
Einstein-Hilbert, then the only possible potential terms free from the
Boulware-Deser ghost are those of de Rham, Gabadadze and Tolley (dRGT). We
point out there are other possibilities if the kinetic terms are not required
to be Einstein-Hilbert. We construct pseudo-linear ghost-free potentials, terms
that derive in a natural way from the linear theory. The simplicity of this
approach allows us to construct diffeomorphism non-invariant higher-derivative
interaction terms that do not introduce ghosts. We conjecture that these terms
should have counterparts in the full dRGT theory. These terms would introduce
new free parameters into the theory and may change some of the conclusions
heretofore drawn.Comment: 21 pages. v4 typo in equations with vectors fixed agai | Ghost-Free Derivative Interactions for a Massive Graviton | ghost-free derivative interactions for a massive graviton | lorentz massive graviton einstein hilbert boulware deser ghost rham gabadadze tolley drgt possibilities einstein hilbert. pseudo ghost potentials derive theory. simplicity diffeomorphism ghosts. conjecture counterparts drgt theory. heretofore pages. typo agai | non_dup | [] |
24949994 | 10.1007/JHEP10(2013)104 | A recently proposed asymmetric mirror dark matter model where the mirror
sector is connected with the visible one by a right handed neutrino portal, is
shown to lead naturally to a 3+1 active-sterile neutrino spectrum, if the
portal consists only of two right handed neutrinos. At the tree level the model
has four massless neutrino states, three active and one sterile. The active
neutrinos pick up tiny masses via the minimal radiative inverse seesaw
mechanism at the one loop level. The loop effects also generate the large solar
and atmospheric mixings, as well as the observed reactor mixing for certain
range of parameters of the model. The dominant contribution to the sterile
neutrino mass ($\sim$ eV) arises from the gravitationally induced dimension-5
operators. Generating active-sterile mixing requires a two Higgs doublet
extension of SM and a small mixing between the ordinary and mirror Higgs
fields, which occurs naturally in mirror models.Comment: 18 pages, 4 figures, 2 tables, text minorly modified, one figure
added, typos and lapses corrected, references updated, version published in
JHE | A Naturally Light Sterile neutrino in an Asymmetric Dark Matter Model | a naturally light sterile neutrino in an asymmetric dark matter model | asymmetric mirror mirror visible handed portal naturally sterile portal handed neutrinos. massless sterile. neutrinos pick tiny radiative seesaw level. mixings reactor model. sterile arises gravitationally operators. generating sterile doublet ordinary mirror naturally mirror pages tables minorly typos lapses corrected updated | non_dup | [] |
24935965 | 10.1007/JHEP10(2013)105 | We study the naturalness problem using a model independent bottom up approach
by considering models where only the interaction terms needed to cancel the
Higgs quadratic divergences are present. If quadratic divergences are canceled
by terms linear in the Higgs field, then the collider phenomenology is well
covered by current electroweakino and fourth generation searches. If quadratic
divergences are canceled by terms bilinear in the Higgs field, then the
signatures are highly dependent on the quantum numbers of the new particles.
Precision Higgs measurements can reveal the presence of new particles with
either vevs or Standard Model charges. If the new particles are scalar dark
matter candidates, their direct and indirect detection signatures will be
highly correlated and within the reach of XENON100 and Fermi. Observation at
one of these experiments would imply observation at the other one. Observable
LHC decay channels can also arise if the new particles mix with lighter states.
This decay channel involves only the Higgs boson and not the gauge bosons.
Observation of such decays would give evidence that the new particle is tied to
the naturalness problem.Comment: 14 pages + appendix, journal versio | Minimal Signatures of Naturalness | minimal signatures of naturalness | naturalness cancel quadratic divergences present. quadratic divergences canceled collider phenomenology covered electroweakino fourth searches. quadratic divergences canceled bilinear signatures particles. precision reveal vevs charges. candidates indirect signatures xenon fermi. imply one. observable arise lighter states. involves boson bosons. decays tied naturalness pages versio | non_dup | [] |
24948742 | 10.1007/JHEP10(2013)106 | We study semiclassical strings in the near horizon geometry of certain curved
branes. We investigate the rigidly rotating strings in the near horizon
geometry of NS5-branes wrapped on AdS3 x S3 and in the presence of background
NS-NS flux. We study several string solutions corresponding to giant magnon,
single spike and more general folded strings for the fundamental string in this
background. We comment that in the S-dual background the situation changes
drastically.Comment: 22 pages, JHEP styl | Semiclassical Strings on Curved Branes | semiclassical strings on curved branes | semiclassical strings horizon curved branes. rigidly rotating strings horizon branes wrapped flux. giant magnon spike folded strings background. comment pages jhep styl | non_dup | [] |
24941211 | 10.1007/JHEP10(2013)110 | Holographic entanglement entropy provides a direct connection between
classical geometry and quantum entanglement; however the usual prescription
does not apply to theories of higher spin gravity, where standard notions of
geometry are no longer gauge invariant. We present a proposal for the
holographic computation of entanglement entropy in field theories dual to
higher spin theories of gravity in AdS3. These theories have a Chern-Simons
description, and our proposal involves a Wilson line in an infinite-dimensional
representation of the bulk gauge group. In the case of spin-2 gravity such
Wilson lines are the natural coupling of a heavy point particle to gravity and
so are equivalent to the usual prescription of Ryu and Takayanagi. For higher
spin gravity they provide a natural generalization of these ideas. We work out
spin-3 gravity in detail, showing that our proposal recovers many expected
results and computes thermal entropies of black holes with higher spin charge,
finding agreement with previous expressions in the literature. We encounter
some peculiarities in the case of non-unitary RG flow backgrounds and outline
future generalizations.Comment: 52 pages + appendices, 5 figures; v2: references added, expanded
discussion in Appendix C; v3: minor typos corrected, accepted version JHEP;
v4: minor typos correcte | Wilson Lines and Entanglement Entropy in Higher Spin Gravity | wilson lines and entanglement entropy in higher spin gravity | holographic entanglement connection entanglement usual prescription notions invariant. proposal holographic entanglement chern simons proposal involves wilson infinite group. wilson usual prescription takayanagi. generalization ideas. proposal recovers computes entropies holes expressions literature. encounter peculiarities unitary backgrounds outline pages appendices expanded minor typos corrected jhep minor typos correcte | non_dup | [] |
24943791 | 10.1007/JHEP10(2013)111 | We derive the low-energy effective action for the spinning (GKP) string in
AdS(3) x S(3) x M(4) where M(4) = S(3) x S(1) or T(4). In the first case the
action consists of two O(4) non-linear sigma models which are coupled through
their interaction with four massless Majorana fermions (plus one free decoupled
scalar). While in the second case it consists of one O(4) sigma model coupled
to four Majorana fermions together with four free scalars from the T(4). We
show that these models are classically integrable by constructing their Lax
connections.Comment: 13 page | The low energy limit of the AdS(3) x S(3) x M(4) spinning string | the low energy limit of the ads(3) x s(3) x m(4) spinning string | derive spinning sigma massless majorana fermions decoupled sigma majorana fermions scalars classically integrable constructing | non_dup | [] |
24951239 | 10.1007/JHEP10(2013)116 | We analyze vacuum instability of strongly coupled gauge theories in a
constant electric field using AdS/CFT correspondence. The model is the N=2
1-flavor supersymmetric large N_c QCD in the strong 't Hooft coupling limit. We
calculate the Euler-Heisenberg effective Lagrangian L(E), which encodes the
nonlinear response and the quantum decay rate of the vacuum in a background
electric field E, from the complex D-brane action in AdS/CFT. We find that the
decay rate given by Im L(E) becomes nonzero above a critical electric field set
by the confining force between quarks. A large-E expansion of Im L(E) is found
to coincide with that of the Schwinger effects in QED, replacing its electron
mass by the confining force. Then, the time-dependent response of the system in
a strong electric field is solved non-perturbatively, and we observe a
universal thermalization at a shortest timescale "Planckian thermalization
time" t ~ 1/T ~ E^{-1/2}. Here, T is an effective temperature which quarks feel
in the nonequilibrium state with nonzero electric current, calculated in
AdS/CFT as a Hawking temperature. Stronger electric fields accelerate the
thermalization, and for a realistic value of the electric field in RHIC
experiment, we obtain t ~ 1 [fm/c], which is consistent with the believed
value.Comment: 41 page | Vacuum Instability in Electric Fields via AdS/CFT: Euler-Heisenberg
Lagrangian and Planckian Thermalization | vacuum instability in electric fields via ads/cft: euler-heisenberg lagrangian and planckian thermalization | analyze instability correspondence. flavor supersymmetric hooft limit. euler heisenberg lagrangian encodes brane cft. nonzero confining quarks. coincide schwinger replacing confining force. solved perturbatively universal thermalization shortest timescale planckian thermalization quarks feel nonequilibrium nonzero hawking temperature. stronger accelerate thermalization realistic rhic believed | non_dup | [] |
24954644 | 10.1007/JHEP10(2013)117 | We apply the principle of maximum conformality (PMC) to the
Balitsky-Fadin-Kuraev-Lipatov (BFKL) Pomeron intercept at the next-to-leading
logarithmic (NLL) accuracy. The PMC eliminates the conventional renormalization
scale ambiguity by absorbing the non-conformal $\{\beta_i\}$-terms into the
running coupling, and a more accurate pQCD estimation can be obtained. After
PMC scale setting, the QCD perturbative convergence can be greatly improved due
to the elimination of renormalon terms in pQCD series, and the BFKL Pomeron
intercept has a weak dependence on the virtuality of the reggeized gluon. For
example, by taking the Fried-Yennie gauge, we obtain $\omega_{\rm MOM}^{\rm
PMC}(Q^{2},0)\in [0.149,0.176]$ for $Q^2\in[1,100]\;{\rm GeV}^2$. This is a
good property to apply to the high-energy phenomenology. Further more, to
compare with the data, it is found that the physical ${\rm MOM}$-scheme is more
reliable than the $\overline{\rm MS}$-scheme. The ${\rm MOM}$-scheme is gauge
dependent, which can also be greatly suppressed after PMC scale setting. We
discuss the MOM-scheme gauge dependence for the Pomeron intercept by adopting
three gauges, i.e. the Landau gauge, the Feynman gauge and the Fried-Yennie
gauge, and we obtain $\omega_{\rm MOM}^{\rm PMC}(Q^{2}=15\;{\rm GeV}^2,0) =
0.166^{+0.010}_{-0.017}$; i.e. about $10\%$ gauge dependence is observed. We
apply the BFKL Pomeron intercept to the photon-photon collision process, and
compare the theoretical predictions with the data from the OPAL and L3
experiments.Comment: 18 pages, 6 figures. References updated and discussions improve | Reanalysis of the BFKL Pomeron at the next-to-leading logarithmic
accuracy | reanalysis of the bfkl pomeron at the next-to-leading logarithmic accuracy | conformality balitsky fadin kuraev lipatov bfkl pomeron intercept logarithmic accuracy. eliminates renormalization ambiguity absorbing conformal beta running pqcd obtained. perturbative greatly elimination renormalon pqcd bfkl pomeron intercept virtuality reggeized gluon. fried yennie omega phenomenology. reliable overline scheme. greatly suppressed setting. pomeron intercept adopting gauges i.e. landau feynman fried yennie omega i.e. observed. bfkl pomeron intercept collision opal pages figures. updated discussions | non_dup | [] |
24952726 | 10.1007/JHEP10(2013)118 | A new two-loop radiative Majorana neutrino mass model is constructed from the
gauge-invariant effective operator $L^i L^j Q^k d^c Q^l d^c \epsilon_{ik}
\epsilon_{jl}$ that violates lepton number conservation by two units. The
ultraviolet completion features two scalar leptoquark flavors and a color-octet
Majorana fermion. We show that there exists a region of parameter space where
the neutrino oscillation data can be fitted while simultaneously meeting
flavor-violation and collider bounds. The model is testable through lepton
flavor-violating processes such as ${\mu} \to e{\gamma}$, $\mu \to eee$, and
$\mu N \to eN$ conversion, as well as collider searches for the scalar
leptoquarks and color-octet fermion. We computed and compiled a list of
necessary Passarino-Veltman integrals up to boxes in the approximation of
vanishing external momenta and made them available as a Mathematica package,
denoted as ANT.Comment: 42 pages, 11 figures, typo in Eq. (4.9) as well as wrong chirality
structures in Secs. 4.5 and 5.2 corrected, final results unchange | Testable two-loop radiative neutrino mass model based on an $LLQd^cQd^c$
effective operator | testable two-loop radiative neutrino mass model based on an $llqd^cqd^c$ effective operator | radiative majorana epsilon epsilon violates lepton conservation units. ultraviolet completion leptoquark flavors octet majorana fermion. oscillation fitted simultaneously meeting flavor violation collider bounds. testable lepton flavor violating gamma conversion collider searches leptoquarks octet fermion. compiled passarino veltman integrals boxes vanishing momenta mathematica package denoted pages typo wrong chirality secs. corrected unchange | non_dup | [] |
24950850 | 10.1007/JHEP10(2013)119 | We present a rigorous theoretical analysis of the ALICE measurement of
low-p_T direct-photon production in central lead-lead collisions at the LHC
with a centre-of-mass energy of \sqrt{s_{NN}}=2.76 TeV. Using NLO QCD, we
compute the relative contributions to prompt-photon production from different
initial and final states and the theoretical uncertainties coming from
independent variations of the renormalisation and factorisation scales, the
nuclear parton densities and the fragmentation functions. Based on different
fits to the unsubtracted and prompt-photon subtracted ALICE data, we
consistently find T = 304 \pm 58 MeV and 309 \pm 64 MeV for the effective
temperature of the quark-gluon plasma (or hot medium) at p_T \in [0.8;2.2] GeV
and p_T \in [1.5;3.5] GeV as well as a power-law (p_T^{-4}) behavior for p_T >
4 GeV as predicted by QCD hard scattering.Comment: 18 pages, 7 figures, 1 tabl | How robust is a thermal photon interpretation of the ALICE low-p_T data? | how robust is a thermal photon interpretation of the alice low-p_t data? | rigorous alice collisions sqrt tev. prompt coming renormalisation factorisation parton densities fragmentation functions. fits unsubtracted prompt subtracted alice consistently gluon pages tabl | non_dup | [] |
24948216 | 10.1007/JHEP10(2013)124 | Indirect detection constraints on gamma rays (both continuum and lines) have
set strong constraints on wino dark matter. By combining results from Fermi-LAT
and HESS, we show that: light nonthermal wino dark matter is strongly excluded;
thermal wino dark matter is allowed only if the Milky Way dark matter
distribution has a significant (>~0.4 kpc) core; and for plausible NFW and
Einasto distributions the entire range of wino masses from 100 GeV up to 3 TeV
can be excluded. The case of light, nonthermal wino dark matter is particularly
interesting in scenarios with decaying moduli that reheat the universe to a low
temperature. Typically such models have been discussed for low reheating
temperatures, not far above the BBN bound of a few MeV. We show that
constraints on the allowed wino relic density push such models to higher
reheating temperatures and hence heavier moduli. Even for a flattened halo
model consisting of an NFW profile with constant-density core inside 1 kpc and
a density near the sun of 0.3 GeV/cm^3, for 150 GeV winos current data
constrains the reheat temperature to be above 1.4 GeV. As a result, for models
in which the wino mass is a loop factor below the gravitino mass, the data
favor moduli that are more than an order of magnitude heavier than the
gravitino. We discuss some of the sobering implications of this result for the
status of supersymmetry. We also comment on other neutralino dark matter
scenarios, in particular the case of mixed bino/higgsino dark matter. We show
that in this case, direct and indirect searches are complementary to each other
and could potentially cover most of the parameter space | In Wino Veritas? Indirect Searches Shed Light on Neutralino Dark Matter | in wino veritas? indirect searches shed light on neutralino dark matter | indirect gamma rays continuum wino matter. combining fermi hess nonthermal wino excluded wino milky plausible einasto wino excluded. nonthermal wino scenarios decaying moduli reheat universe temperature. reheating mev. wino relic push reheating heavier moduli. flattened halo consisting winos constrains reheat gev. wino gravitino favor moduli heavier gravitino. sobering supersymmetry. comment neutralino scenarios bino higgsino matter. indirect searches complementary potentially cover | non_dup | [] |
24940855 | 10.1007/JHEP10(2013)126 | We construct charged black branes in type IIA flux compactifications that are
dual to (2+1)-dimensional field theories at finite density. The internal space
is a general Calabi-Yau manifold with fluxes, with internal dimensions much
smaller than the AdS radius. Gauge fields descend from the 3-form RR potential
evaluated on harmonic forms of the Calabi-Yau, and Kaluza-Klein modes decouple.
Black branes are described by a four-dimensional effective field theory that
includes only a few light fields and is valid over a parametrically large range
of scales. This effective theory determines the low energy dynamics, stability
and thermodynamic properties. Tools from flux compactifications are also used
to construct holographic CFTs with no relevant scalar operators, that can lead
to symmetric phases of condensed matter systems stable to very low
temperatures. The general formalism is illustrated with simple examples such as
toroidal compactifications and manifolds with a single size modulus. We
initiate the classification of holographic phases of matter described by flux
compactifications, which include generalized Reissner-Nordstrom branes,
nonsupersymmetric $AdS_2 \times R^2$ and hyperscaling violating solutions.Comment: 37 pages, 2 figures, typos corrected and comments adde | Black branes in flux compactifications | black branes in flux compactifications | branes compactifications density. calabi manifold fluxes radius. descend harmonic calabi kaluza klein decouple. branes valid parametrically scales. determines thermodynamic properties. compactifications holographic cfts condensed temperatures. formalism illustrated toroidal compactifications manifolds modulus. initiate holographic compactifications reissner nordstrom branes nonsupersymmetric hyperscaling violating pages typos corrected comments adde | non_dup | [] |
24955317 | 10.1007/JHEP10(2013)128 | In this work we analyze the corrections to tribimaximal (TBM), bimaximal (BM)
and democratic (DC) mixing matrices for explaining large reactor mixing angle
$\theta_{13}$ and checking the consistency with other neutrino mixing angles.
The corrections are parameterized in terms of small orthogonal rotations (R)
with corresponding modified PMNS matrix of the form $R_{ij}\cdot U \cdot
R_{kl}$ where $R_{ij}$ is rotation in ij sector and U is any one of these
special matrices. We showed the rotations $R_{13}\cdot U \cdot R_{23}$,
$R_{12}\cdot U \cdot R_{13}$ for BM and $R_{13}\cdot U \cdot R_{13}$ for TBM
perturbative case successfully fit all neutrino mixing angles within $1\sigma$
range. The perturbed PMNS matrix $R_{12}\cdot U \cdot R_{13}$ for DC, TBM and
$R_{23}\cdot U \cdot R_{23}$ for TBM case is successful in producing mixing
angles at 2$\sigma$ level. The other rotation schemes are either excluded or
successful in producing mixing angles at $3\sigma$ level.Comment: 25 pages, 56 figures; v2: new rotation cases with corresponding
discussion and figures included, new references added, accepted for
publication in JHE | Corrections for tribimaximal, bimaximal and democratic neutrino mixing
matrices | corrections for tribimaximal, bimaximal and democratic neutrino mixing matrices | analyze tribimaximal bimaximal democratic explaining reactor theta checking consistency angles. parameterized orthogonal rotations pmns cdot cdot matrices. rotations cdot cdot cdot cdot cdot cdot perturbative successfully angles sigma range. perturbed pmns cdot cdot cdot cdot successful producing angles sigma level. schemes excluded successful producing angles sigma pages publication | non_dup | [] |
24959115 | 10.1007/JHEP10(2013)129 | Sphalerons of a new gauge interaction can convert a primordial asymmetry in B
or L into a dark matter asymmetry. From the equilibrium conditions for the
sphalerons of both the electroweak and the new interactions, one can compute
the ratios of B, L, and X, where X is the dark matter number, thus determining
the mass of the dark matter particle fairly precisely. Such a scenario can
arise naturally in the context of unification with larger groups. An
illustrative model embeddable in $SU(6) \times SU(2) \subset E_6$ is described
as well as an equally simple model based on SU(7).Comment: 13 pages. Revised introduction and references, changed titl | Cogeneration of Dark Matter and Baryons by Non-Standard-Model Sphalerons
in Unified Models | cogeneration of dark matter and baryons by non-standard-model sphalerons in unified models | sphalerons convert primordial asymmetry asymmetry. sphalerons electroweak determining fairly precisely. arise naturally unification groups. illustrative embeddable equally .comment pages. revised changed titl | non_dup | [] |
24935423 | 10.1007/JHEP10(2013)131 | We extend the analysis of the RG trajectory connecting successive minimal CFT
models ${\cal M}_p$ and ${\cal M}_{p-1}$ for $p\gg 1$, performed by A.
Zamolodchikov, to the fields $\varphi_{n,n\pm 3}$. This required a close
investigation of mixing with the descendant fields at the level 2. In
particular we identify those specific linear combinations of UV fields which
flow to the IR fields $\varphi_{n+3,n}$ and $\varphi_{n-3,n}$. We report also
the results of the calculation of the same mixing coefficients through the
recent RG domain wall approach by Gaiotto. These results are in complete
agreement with the leading order perturbation theory.Comment: 13 pages; minor corrections; version published in JHE | Mixing with descendant fields in perturbed minimal CFT models | mixing with descendant fields in perturbed minimal cft models | extend trajectory connecting successive zamolodchikov varphi descendant combinations varphi varphi gaiotto. perturbation pages minor | non_dup | [] |
24947935 | 10.1007/JHEP10(2013)132 | We investigate the current status of the light neutralino dark matter
scenario within the minimal supersymmetric standard model (MSSM) taking into
account latest results from the LHC. A discussion of the relevant constraints,
in particular from the dark matter relic abundance, leads us to a manageable
simplified model defined by a subset of MSSM parameters. Within this simplified
model we reinterpret a recent search for electroweak supersymmetric particle
production based on a signature including multi-taus plus missing transverse
momentum performed by the ATLAS collaboration. In this way we derive stringent
constraints on the light neutralino parameter space. In combination with
further experimental information from the LHC, such as dark matter searches in
the monojet channel and constraints on invisible Higgs decays, we obtain a
lower bound on the lightest neutralino mass of about 24 GeV. This limit is
stronger than any current limit set by underground direct dark matter searches
or indirect detection experiments. With a mild improvement of the sensitivity
of the multi-tau search, light neutralino dark matter can be fully tested up to
about 30 GeV.Comment: 26 pages, 11 figures. v2: version published in JHE | Cornering light Neutralino Dark Matter at the LHC | cornering light neutralino dark matter at the lhc | neutralino supersymmetric mssm latest lhc. relic abundance manageable simplified mssm parameters. simplified reinterpret electroweak supersymmetric signature taus missing atlas collaboration. derive stringent neutralino space. searches monojet invisible decays lightest neutralino gev. stronger underground searches indirect experiments. mild neutralino pages figures. | non_dup | [] |
24938407 | 10.1007/JHEP10(2013)133 | We study the fine tuning associated to a `Natural Supersymmetry' spectrum
with stops, after RG running, significantly lighter than the first two
generation sfermions and the gluino. In particular, we emphasise that this
tuning should be measured with respect to the parameters taken to be
independent at the assumed UV boundary of the renormalisation group flow, and
improve the accuracy of previous approximate expressions. It is found that, if
running begins at $10^{16}~\rm{GeV}$ $\left(10^5~\rm{GeV}\right)$, decreasing
the UV stop mass below $0.75$ $\left(0.4\right)$ of the weak scale Majorana
gluino mass does not improve the overall fine tuning of the theory. In
contrast, it is possible to raise the first two generation sfermion masses out
of LHC reach without introducing additional tuning. After running, regions of
parameter space favoured by naturalness and consistent with LHC bounds
typically have IR stop masses of order 1.5 TeV (0.75 TeV), and fine tuning of
at least 400 (50) for high (low) scale mediation. We also study the fine tuning
of theories with Dirac gluinos. These allow for substantial separation of the
gluino and sfermion masses and, regardless of the scale of mediation, lead to
relatively low fine tuning of order 50. Hence viable models can still favour
light stops, but this requires extra structure beyond the MSSM field content.Comment: 26 pages, 8 figures, V3: JHEP versio | Is Natural SUSY Natural? | is natural susy natural? | fine tuning supersymmetry stops running lighter sfermions gluino. emphasise tuning renormalisation approximate expressions. running begins decreasing stop majorana gluino fine tuning theory. raise sfermion introducing tuning. running favoured naturalness bounds stop fine tuning mediation. fine tuning dirac gluinos. substantial gluino sfermion regardless mediation fine tuning viable favour stops extra mssm pages jhep versio | non_dup | [] |
24954242 | 10.1007/JHEP10(2013)134 | Extended Higgs sectors appear in many models for physics beyond the Standard
Model. Current Higgs measurements at the LHC are starting to significantly
constrain them. We study their Higgs coupling patterns at tree level as well as
including quantum corrections. Our benchmarks include a dark singlet-doublet
extension and several two-doublet setups. Using SFitter we translate the
current Higgs coupling measurements for one light Higgs state into their
respective parameter spaces. Finally, we show how two-Higgs-doublet models can
serve as a consistent ultraviolet completion of an assumed single
Standard-Model-like Higgs boson with free couplings.Comment: 49 pages, including the updated SFitter Higgs couplings results for
the Standard Mode | Measuring extended Higgs sectors as a consistent free couplings model | measuring extended higgs sectors as a consistent free couplings model | sectors model. constrain them. corrections. benchmarks singlet doublet doublet setups. sfitter translate respective spaces. doublet serve ultraviolet completion boson pages updated sfitter couplings | non_dup | [] |
5233926 | 10.1007/JHEP10(2013)135 | The generalized quark-antiquark potential of N=4 supersymmetric Yang-Mills
theory on S^3 x R calculates the potential between a pair of heavy charged
particles separated by an arbitrary angle on S^3 and also an angle in flavor
space. It can be calculated by a Wilson loop following a prescribed path and
couplings, or after a conformal transformation, by a cusped Wilson loop in flat
space, hence also generalizing the usual concept of the cusp anomalous
dimension. In AdS_5 x S^5 this is calculated by an infinite open string. I
present here an open spin-chain model which calculates the spectrum of
excitations of such open strings. In the dual gauge theory these are cusped
Wilson loops with extra operator insertions at the cusp. The boundaries of the
spin-chain introduce a non-trivial reflection phase and break the bulk symmetry
down to a single copy of psu(2|2). The dependence on the two angles is captured
by the two embeddings of this algebra into \psu(2|2)^2, i.e., by a global
rotation. The exact answer to this problem is conjectured to be given by
solutions to a set of twisted boundary thermodynamic Bethe ansatz integral
equations. In particular the generalized quark-antiquark potential or cusp
anomalous dimension is recovered by calculating the ground state energy of the
minimal length spin-chain, with no sites. It gets contributions only from
virtual particles reflecting off the boundaries. I reproduce from this
calculation some known weak coupling perturtbative results.Comment: 40 pages, 11 figures; v2-some formulas corrected, results unchange | Integrable Wilson loops | integrable wilson loops | antiquark supersymmetric mills calculates separated flavor space. wilson prescribed couplings conformal cusped wilson generalizing usual cusp anomalous dimension. infinite string. calculates excitations strings. cusped wilson loops extra insertions cusp. boundaries trivial reflection break copy angles captured embeddings i.e. rotation. answer conjectured twisted thermodynamic bethe ansatz equations. antiquark cusp anomalous recovered calculating sites. gets virtual reflecting boundaries. reproduce perturtbative pages formulas corrected unchange | non_dup | [] |
24939829 | 10.1007/JHEP10(2013)136 | In the framework of a gauge mediated quiver-like model, the standard model
flavor texture can be naturally generated. The model - like the MSSM - has
furthermore a region in parameter space where the lightest Higgs mass is fed by
heavy stop loops, which in turn sets the average squark mass scale near 10-20
TeV. We perform a careful flavor analysis to check whether this type of
mild-split SUSY passes all flavor constraints as easily as envisioned in the
original type of split SUSY. Interestingly, it turns out to be on the border of
several constraints, in particular, the branching ratio of mu -> e gamma and,
if order one complex phases are assumed, also epsilon_K neutron and electron
EDM. Furthermore, we consider unification as well as dark matter candidates,
especially the gravitino. Finally, we provide a closed-form formula for the
soft masses of matter in arbitrary representations of any of the gauge groups
in a generic quiver-like model with a general messenger sector.Comment: LaTeX, 37 pages, 15 figures; V2: references added, minor corrections
in sec. | Mild-split SUSY with flavor | mild-split susy with flavor | quiver flavor texture naturally generated. mssm lightest stop loops squark tev. careful flavor check mild split susy passes flavor envisioned split susy. interestingly turns border branching gamma epsilon neutron edm. unification candidates gravitino. representations generic quiver messenger latex pages minor sec. | non_dup | [] |
24945233 | 10.1007/JHEP10(2013)140 | We present a subset method which solves the sign problem for QCD at nonzero
quark chemical potential in 0+1 dimensions. The subsets gather gauge
configurations based on the center symmetry of the SU(3) group. We show that
the sign problem is solved for one to five quark flavors and that it slowly
reappears for a larger number of flavors. We formulate an extension of the
center subsets that solves the sign problem for a larger number of flavors as
well. We also derive some new analytical results for this toy model.Comment: 29 pages, 12 figures; references added, as published in JHE | Subset method for one-dimensional QCD | subset method for one-dimensional qcd | solves nonzero dimensions. subsets gather configurations group. solved flavors slowly reappears flavors. formulate subsets solves flavors well. derive pages | non_dup | [] |
24939835 | 10.1007/JHEP10(2013)141 | The complete tree-level S-matrix of four dimensional ${\cal N}=4$ super
Yang-Mills and ${\cal N} = 8$ supergravity has compact forms as integrals over
the moduli space of certain rational maps. In this note we derive formulas for
amplitudes in three dimensions by using the fact that when amplitudes are
dressed with proper wave functions dimensional reduction becomes
straightforward. This procedure leads to formulas in terms of rational maps for
three dimensional maximally supersymmetric Yang-Mills and gravity theories. The
integrand of the new formulas contains three basic structures:
Parke-Taylor-like factors, Vandermonde determinants and resultants. Integrating
out some of the Grassmann directions produces formulas for theories with less
than maximal supersymmetry, which exposes yet a fourth kind of structure.
Combining all four basic structures we start a search for consistent S-matrices
in three dimensions. Very nicely, the most natural ones are those corresponding
to ABJM and BLG theories. We also make a connection between the power of a
resultant in the integrand, representations of the Poincar\'e group, infrared
behavior and conformality of a theory. Extensions to other theories in three
dimensions and to arbitrary dimensions are also discussed.Comment: 21 page | Scattering in Three Dimensions from Rational Maps | scattering in three dimensions from rational maps | super mills supergravity integrals moduli rational maps. derive formulas amplitudes amplitudes dressed proper straightforward. formulas rational maximally supersymmetric mills theories. integrand formulas parke taylor vandermonde determinants resultants. integrating grassmann directions produces formulas maximal supersymmetry exposes fourth kind structure. combining dimensions. nicely abjm theories. connection resultant integrand representations poincar infrared conformality theory. extensions | non_dup | [] |
24953082 | 10.1007/JHEP10(2013)142 | Potential reconstruction can be used to find various analytical asymptotical
AdS solutions in Einstein dilation system generally. We have generated two
simple solutions without physical singularity called zero temperature
solutions. We also proposed a numerical way to obtain black hole solution in
Einstein dilaton system with special dilaton potential. By using this method,
we obtain the corresponding black hole solutions numerically and investigate
the thermal stability of the black hole by comparing the free energy of thermal
gas and the corresponding black hole. In two groups of non-conformal gravity
solutions obtained in this paper, we find that the two thermal gas solutions
are more unstable than black hole solutions respectively. Finally, we consider
black hole solutions as a thermal state of zero temperature solutions to check
that the first thermal dynamical law exists in entanglement system from
holographic point of view.Comment: 39 pages, 14 figures, version accepted by JHE | Entanglement Temperature in Non-conformal Cases | entanglement temperature in non-conformal cases | reconstruction asymptotical einstein dilation generally. singularity solutions. einstein dilaton dilaton potential. numerically hole. conformal unstable respectively. check entanglement holographic pages | non_dup | [] |
24950941 | 10.1007/JHEP10(2013)144 | We compute the asymptotic symmetry group of the four dimensional
near-extremal Kerr-Sen black hole within an AdS2/CFT1 correspondence. We do
this by performing a Robinson-Wilczek two dimensional reduction and construct a
quantum theory of the remaining field content. The resulting energy momentum
tensor generates an asymptotic Virasoro algebra, to s-wave, with a calculable
central extension. This center in conjunction with the proper regularized
lowest Virasoro eigen-mode yields the near-extremal Kerr-Sen entropy via the
statistical Cardy formula. Finally we analyze quantum holomorphic fluxes of the
dual CFT giving rise to a finite Hawking temperature weighted by the central
charge of the near-extremal Kerr-Sen metric.Comment: 16 pages, references added, revised for clarity. To appear in JHE | Near-Extremal Black Hole Thermodynamics from AdS2/CFT1 Correspondence in
The Low Energy Limit of 4D Heterotic String Theory | near-extremal black hole thermodynamics from ads2/cft1 correspondence in the low energy limit of 4d heterotic string theory | asymptotic extremal kerr correspondence. performing robinson wilczek content. generates asymptotic virasoro calculable extension. conjunction proper regularized virasoro eigen extremal kerr cardy formula. analyze holomorphic fluxes giving hawking weighted extremal kerr pages revised clarity. | non_dup | [] |
24931386 | 10.1007/JHEP10(2013)145 | In de Sitter space, the gravitational fluctuation at the super-horizon scale
may make physical quantities time dependent by breaking the de Sitter symmetry.
We adopt the Kadanoff-Baym approach to evaluate soft gravitational effects in a
matter system at the sub-horizon scale. This investigation proves that only the
local terms contribute to the de Sitter symmetry breaking at the one-loop
level. The IR singularities in the non-local terms cancel after summing over
degenerate states between real and virtual processes. The corresponding IR
cut-off is given by the energy resolution like QED. Since the energy resolution
is physical and independent of cosmic evolution, the non-local contributions do
not induce the de Sitter symmetry breaking. We can confirm that soft
gravitational effects preserve the effective Lorentz invariance.Comment: 27 page | Soft gravitational effects in Kadanoff-Baym approach | soft gravitational effects in kadanoff-baym approach | sitter gravitational fluctuation super horizon quantities breaking sitter symmetry. adopt kadanoff baym gravitational horizon scale. proves sitter breaking level. singularities cancel summing degenerate virtual processes. qed. cosmic induce sitter breaking. confirm gravitational preserve lorentz | non_dup | [] |
24963466 | 10.1007/JHEP10(2013)147 | We consider a hybrid Monte Carlo algorithm which is applicable to lattice
theories defined on Lefschetz thimbles. In the algorithm, any point (field
configuration) on a thimble is parametrized uniquely by the flow-direction and
the flow-time defined at a certain asymptotic region close to the critical
point, and it is generated by solving the gradient flow equation downward. The
associated complete set of tangent vectors is also generated in the same
manner. Molecular dynamics is then formulated as a constrained dynamical
system, where the equations of motion with Lagrange multipliers are solved by
the second-order constraint-preserving symmetric integrator. The algorithm is
tested in the lambda phi^4 model at finite density, by choosing the thimbles
associated with the classical vacua for subcritical and supercritical values of
chemical potential. For the lattice size L=4, we find that the residual sign
factors average to not less than 0.99 and are safely included by reweighting
and that the results of the number density are consistent with those obtained
by the complex Langevin simulations.Comment: 25 pages, 10 figures, references updated, comments added, typos
correcte | Hybrid Monte Carlo on Lefschetz Thimbles -- A study of the residual sign
problem | hybrid monte carlo on lefschetz thimbles -- a study of the residual sign problem | hybrid monte carlo applicable lefschetz thimbles. thimble parametrized uniquely asymptotic solving downward. tangent manner. formulated constrained lagrange multipliers solved preserving integrator. lambda choosing thimbles vacua subcritical supercritical potential. residual safely reweighting langevin pages updated comments typos correcte | non_dup | [] |
24951655 | 10.1007/JHEP10(2013)148 | The AdS/CFT correspondence predicts that background non-abelian magnetic
fields induce instabilities in strongly-coupled systems with non-abelian global
symmetries. These instabilities lead to the formation of vortex lattices in
which the non-abelian currents "antiscreen" the applied magnetic field. From
the bulk perspective, this behaviour can be traced to a well-known instability
of Yang-Mills theory. We analyse the phase structure of the instability and
comment on aspects of the vortex lattice.Comment: 13 pages. Version to appear in JHE | A Non-Abelian Vortex Lattice in Strongly Coupled Systems | a non-abelian vortex lattice in strongly coupled systems | correspondence predicts abelian induce instabilities abelian symmetries. instabilities vortex lattices abelian currents antiscreen field. perspective traced instability mills theory. analyse instability comment vortex pages. | non_dup | [] |
24952816 | 10.1007/JHEP10(2013)154 | We study N=2 four-dimensional flux vacua describing intrinsic
non-perturbative systems of 3 and 7 branes in type IIB string theory. The
solutions are described as compactifications of a G(ravity) theory on a Calabi
Yau threefold which consists of a fibration of an auxiliary K3 surface over an
S^2 base. In the spirit of F-theory, the complex structure of the K3 surface
varying over the base codifies the details of the fluxes, the dilaton and the
warp factors in type IIB string theory. We discuss in detail some simple
examples of geometric and non-geometric solutions where the precise
flux/geometry dictionary can be explicitly worked out. In particular, we
describe non-geometric T-fold solutions exhibiting non-trivial T-duality
monodromies exchanging 3- and 7-branes.Comment: 30 pages, 4 figures, v2: typos corrected, comments added, references
adde | U-folds as K3 fibrations | u-folds as k3 fibrations | vacua describing intrinsic perturbative branes theory. compactifications ravity calabi threefold fibration auxiliary base. spirit codifies fluxes dilaton warp theory. geometric geometric precise dictionary explicitly worked out. geometric exhibiting trivial duality monodromies exchanging pages typos corrected comments adde | non_dup | [] |
24939831 | 10.1007/JHEP10(2013)155 | We consider 3d N>= 2 superconformal field theories on a branched covering of
a three-sphere. The Renyi entropy of a CFT is given by the partition function
on this space, but conical singularities break the supersymmetry preserved in
the bulk. We turn on a compensating R-symmetry gauge field and compute the
partition function using localization. We define a supersymmetric observable,
called the super Renyi entropy, parametrized by a real number q. We show that
the super Renyi entropy is duality invariant and reduces to entanglement
entropy in the q -> 1 limit. We provide some examples.Comment: 39 pages, 4 figure | Supersymmetric Renyi Entropy | supersymmetric renyi entropy | superconformal branched covering sphere. renyi partition conical singularities break supersymmetry preserved bulk. compensating partition localization. supersymmetric observable super renyi parametrized super renyi duality reduces entanglement limit. pages | non_dup | [] |
24950960 | 10.1007/JHEP10(2013)157 | The discovery of the Higgs boson with a mass of about 125 GeV intimates us a
possibility of a high-scale supersymmetry (SUSY) breaking model, where a
sfermion mass scale is much higher than the electroweak scale. Although a
general SUSY standard model can contribute to the low-energy flavor and/or
CP-violating processes, the high-scale SUSY breaking model provides smaller
signatures and therefore are less constrained, even in the presence of large
flavor/CP violations of sfermions. However, a manner of gluino decay directly
reflects the squark flavor structure and provides us a clue for the sfermion
flavor structure. In this paper, we study the gluino decay in detail and
discuss the interplay with the gluino decay and low-energy flavor and CP
observation.Comment: 31 pages, 9 figure | Flavor of Gluino Decay in High-Scale Supersymmetry | flavor of gluino decay in high-scale supersymmetry | discovery boson intimates supersymmetry susy breaking sfermion electroweak scale. susy flavor violating susy breaking signatures constrained flavor violations sfermions. manner gluino reflects squark flavor clue sfermion flavor structure. gluino interplay gluino flavor pages | non_dup | [] |
24962081 | 10.1007/JHEP10(2013)158 | We study an extension of the Standard Model (SM) with two interacting cold
Dark Matter (DM) candidates: a neutral Majorana fermion ($\nu$) and a neutral
scalar singlet ($\varphi$). The scalar $\varphi$ interacts with the SM through
the "Higgs portal" coupling while $\nu$ at the tree level interacts only with
$\varphi$ through Yukawa interactions. The relic abundance of $\nu$ and
$\varphi$ is found by solving the Boltzmann equations numerically; for the case
$m_\nu > m_\varphi$ we also derive a reliable approximate analytical solution.
Effects of the interaction between the two DM components are discussed. A scan
over the parameter space is performed to determine the regions consistent with
the WMAP data for DM relic abundance, and with the XENON100 direct detection
limits for the DM-nucleus cross section. We find that although a large region
of the parameter space is allowed by the WMAP constraints, the XENON100 data
severely restricts the parameter space. Taking into account only amplitudes
generated at the tree level one finds three allowed regions for the scalar
mass: $m_\varphi \sim 62.5$ GeV (corresponding to the vicinity of the Higgs
boson resonance responsible for $\varphi\varphi$ annihilation into SM
particles), $m_\varphi \simeq 130-140$ GeV and $m_\varphi \gesim 3 $TeV. 1-loop
induced $\nu$-nucleon scattering has been also calculated and discussed. A
possibility of DM direct detection by the CREST-II experiment was considered.Comment: 22 pages, 17 figures; v2: references added, published in JHEP, v3:
misspelled authors name correcte | Two-Component Dark Matter | two-component dark matter | interacting cold candidates neutral majorana fermion neutral singlet varphi varphi interacts portal interacts varphi yukawa interactions. relic abundance varphi solving boltzmann numerically varphi derive reliable approximate solution. discussed. scan wmap relic abundance xenon nucleus section. wmap xenon severely restricts space. amplitudes finds varphi vicinity boson varphi varphi annihilation varphi simeq varphi gesim tev. nucleon discussed. crest pages jhep misspelled name correcte | non_dup | [] |
24958548 | 10.1007/JHEP10(2013)159 | The infrared behavior of perturbative quantum gravity is studied using the
method developed for QED by Faddeev and Kulish. The operator describing the
asymptotic dynamics is derived and used to construct an IR-finite S matrix and
space of asymptotic states. All-orders cancellation of IR divergences is shown
explicitly at the level of matrix elements for the example case of
gravitational potential scattering. As a practical application of the
formalism, the soft part of a scalar scattering amplitude is related to the
gravitational Wilson line and computed to all orders.Comment: 34 pages, 8 figure | Construction of an asymptotic S matrix for perturbative quantum gravity | construction of an asymptotic s matrix for perturbative quantum gravity | infrared perturbative faddeev kulish. describing asymptotic asymptotic states. orders cancellation divergences explicitly gravitational scattering. practical formalism gravitational wilson pages | non_dup | [] |
24941528 | 10.1007/JHEP10(2013)160 | We analyze the corrections to the precision EW observables in minimal
composite Higgs models by using a general effective parametrization which also
includes the lightest fermionic resonances. A new, possibly large,
logarithmically divergent contribution to S is identified, which comes purely
from the strong dynamics. It can be interpreted as a running of S induced by
the non-renormalizable Higgs interactions due to the non-linear sigma-model
structure. As expected, the corrections to the T parameter coming from fermion
loops are finite and dominated by the contributions of the lightest composite
states. The fit of the oblique parameters suggests a rather stringent lower
bound on the sigma-model scale f > 750GeV. The corrections to the Z bL bL
vertex coming from the lowest-order operators in the effective Lagrangian are
finite and somewhat correlated to the corrections to T. Large additional
contributions are generated by contact interactions with 4 composite fermions.
In this case a logarithmic divergence can be generated and the correlation with
T is removed. We also analyze the tree-level corrections to the top couplings,
which are expected to be large due to the sizable degree of compositeness of
the third generation quarks. We find that for a moderate amount of tuning the
deviation in Vtb can be of order 5% while the distortion of the Z tL tL vertex
can be 10%.Comment: 55 pages. V2: Typos corrected and references added. Matches published
versio | Light top partners and precision physics | light top partners and precision physics | analyze precision observables composite parametrization lightest fermionic resonances. possibly logarithmically divergent comes purely dynamics. interpreted running renormalizable sigma structure. coming fermion loops dominated lightest composite states. oblique stringent sigma gev. coming lagrangian somewhat composite fermions. logarithmic divergence removed. analyze couplings sizable compositeness quarks. moderate tuning distortion .comment pages. typos corrected added. matches versio | non_dup | [] |
24945131 | 10.1007/JHEP10(2013)163 | In this paper, we analyse the stability of extremal black brane horizons with
homogeneous symmetry in the spatial directions in five dimensional gauged
supergravity, under the fluctuations of the scalar fields about their attractor
values. We examine the scalar fluctuation equations at the linearised level and
demand that the fluctuations vanish as one approaches the horizon. Imposing
certain restrictions on the Killing vectors used for gauging we find that the
necessary conditions for stability are satisfied only by a subclass of the
Bianchi metrics whose symmetry group factorises into a two dimensional Lifshitz
symmetry and any homogeneous symmetry group given by the Bianchi
classification. We apply these results to a simple example of a gauged
supergravity model with one vector multiplet to find the stable attractors.Comment: 25 pages, V2 minor changes, added discussions on gauge field and
metric fluctuation | Stability of Bianchi attractors in Gauged Supergravity | stability of bianchi attractors in gauged supergravity | analyse extremal brane horizons homogeneous directions gauged supergravity attractor values. examine fluctuation linearised vanish horizon. imposing restrictions killing gauging satisfied subclass bianchi metrics factorises lifshitz homogeneous bianchi classification. gauged supergravity multiplet pages minor discussions fluctuation | non_dup | [] |
19536366 | 10.1007/JHEP10(2013)164 | A measurement of the Zγ→νν¯γ cross section in pp collisions at s√=7 TeV is presented, using data corresponding to an integrated luminosity of 5.0 fb−1 collected with the CMS detector. This measurement is based on the observation of events with an imbalance of transverse energy in excess of 130 GeV and a single photon in the absolute pseudorapidity range |η| < 1.4 with transverse energy above 145 GeV. The Zγ→νν¯γ production cross section is measured to be 21.1 ± 4.2 (stat.) ± 4.3 (syst.) ± 0.5 (lum.) fb, which agrees with the standard model prediction of 21.9 ± 1.1 fb. The results are combined with the CMS measurement of Zγ production in the ℓ + ℓ − γ final state (where ℓ is an electron or a muon) to yield the most stringent limits to date on triple gauge boson couplings: ∣∣hZ3∣∣<2.7×10−3 , ∣∣hZ4∣∣<1.3×10−5 for ZZγ and ∣∣hγ3∣∣<2.9×10−3 , ∣∣hγ4∣∣<1.5×10−5 for Zγγ couplings | Measurement of the production cross section for Zγ→νν¯γ in pp collisions at s√=7 TeV and limits on ZZγ and Zγγ triple gauge boson couplings | measurement of the production cross section for zγ→νν¯γ in pp collisions at s√=7 tev and limits on zzγ and zγγ triple gauge boson couplings | zγ→νν¯γ collisions luminosity detector. imbalance excess pseudorapidity gev. zγ→νν¯γ stat. syst. lum. agrees muon stringent triple boson couplings ∣∣hz ∣∣hz ∣∣hγ ∣∣hγ couplings | non_dup | [] |
24945495 | 10.1007/JHEP10(2013)165 | We study the asymptotic geometry of the spin foam partition function for a
large class of models, including the models of Barrett and Crane, Engle,
Pereira, Rovelli and Livine, and, Freidel and Krasnov.
The asymptotics is taken with respect to the boundary spins only, no
assumption of large spins is made in the interior. We give a sufficient
criterion for the existence of the partition function. We find that geometric
boundary data is suppressed unless its interior continuation satisfies certain
accidental curvature constraints. This means in particular that most Regge
manifolds are suppressed in the asymptotic regime. We discuss this explicitly
for the case of the configurations arising in the 3-3 Pachner move. We identify
the origin of these accidental curvature constraints as an incorrect twisting
of the face amplitude upon introduction of the Immirzi parameter and propose a
way to resolve this problem, albeit at the price of losing the connection to
the SU(2) boundary Hilbert space.
The key methodological innovation that enables these results is the
introduction of the notion of wave front sets, and the adaptation of tools for
their study from micro local analysis to the case of spin foam partition
functions.Comment: 63 pages, 5 figures v2: Reference correcte | Holonomy spin foam models: Asymptotic geometry of the partition function | holonomy spin foam models: asymptotic geometry of the partition function | asymptotic foam partition barrett crane engle pereira rovelli livine freidel krasnov. asymptotics spins spins interior. criterion partition function. geometric suppressed unless interior continuation satisfies accidental curvature constraints. regge manifolds suppressed asymptotic regime. explicitly configurations arising pachner move. accidental curvature incorrect twisting immirzi propose resolve albeit losing connection hilbert space. methodological innovation enables notion front adaptation micro foam partition pages correcte | non_dup | [] |
19536399 | 10.1007/JHEP10(2013)167 | The W-boson helicity fractions in top-quark decays are measured with tt¯ events in the lepton+jets final state, using proton-proton collisions at a centre-of-mass energy of 7 TeV, collected in 2011 with the CMS detector at the LHC. The data sample corresponds to an integrated luminosity of 5.0 fb−1. The measured fractions of longitudinal, left-, and right-handed helicity are F 0 = 0.682 ± 0.030 (stat.) ± 0.033 (syst.), F L = 0.310 ± 0.022 (stat.) ± 0.022 (syst.), and F R = 0.008 ± 0.012 (stat.) ± 0.014 (syst.), consistent with the standard model predictions. The measured fractions are used to probe the existence of anomalous Wtb couplings. Exclusion limits on the real components of the anomalous couplings g L , g R are also derived | Measurement of the W-boson helicity in top-quark decays from tt¯ production in lepton+jets events in pp collisions at s√=7 TeV | measurement of the w-boson helicity in top-quark decays from tt¯ production in lepton+jets events in pp collisions at s√=7 tev | boson helicity fractions decays lepton jets proton proton collisions lhc. luminosity fractions longitudinal handed helicity stat. syst. stat. syst. stat. syst. predictions. fractions anomalous couplings. exclusion anomalous couplings | non_dup | [] |
24946931 | 10.1007/JHEP10(2013)169 | We construct a set of supersymmetric geometries that represent regular
microstates of the D1-D5-P 3-charge system, using the solution generating
technique of hep-th/0311092. These solutions are constructed as perturbations
around the maximally rotating D1-D5 solution at the linear order, and depend on
the coordinate of S^1 on which the D1- and D5-branes are wrapped. In the
framework of six-dimensional supergravity developed by Gutowski, Martelli and
Reall [hep-th/0306235], these solutions have a 4-dimensional base that depend
on the S^1 coordinate v. The v-dependent base is expected of the superstratum
solutions which are parametrized by arbitrary surfaces, and these solutions
give a modest step toward their explicit construction.Comment: 25 pages. v4: a typo correcte | Perturbative 3-charge microstate geometries in six dimensions | perturbative 3-charge microstate geometries in six dimensions | supersymmetric geometries microstates generating perturbations maximally rotating coordinate branes wrapped. supergravity gutowski martelli reall coordinate superstratum parametrized modest toward pages. typo correcte | non_dup | [] |
24793540 | 10.1007/JHEP10(2013)171 | We analyze the signatures of inflationary models that are coupled to strongly
interacting field theories, a basic class of multifield models also motivated
by their role in providing dynamically small scales. Near the squeezed limit of
the bispectrum, we find a simple scaling behavior determined by operator
dimensions, which are constrained by the appropriate unitarity bounds.
Specifically, we analyze two simple and calculable classes of examples:
conformal field theories (CFTs), and large-N CFTs deformed by relevant
time-dependent double-trace operators. Together these two classes of examples
exhibit a wide range of scalings and shapes of the bispectrum, including nearly
equilateral, orthogonal and local non-Gaussianity in different regimes. Along
the way, we compare and contrast the shape and amplitude with previous results
on weakly coupled fields coupled to inflation. This signature provides a
precision test for strongly coupled sectors coupled to inflation via irrelevant
operators suppressed by a high mass scale up to 1000 times the inflationary
Hubble scale.Comment: 40 pages, 10 figure | Anomalous Dimensions and Non-Gaussianity | anomalous dimensions and non-gaussianity | analyze signatures inflationary interacting multifield motivated dynamically scales. squeezed bispectrum constrained unitarity bounds. analyze calculable conformal cfts cfts deformed trace operators. exhibit scalings shapes bispectrum nearly equilateral orthogonal gaussianity regimes. weakly inflation. signature precision sectors inflation irrelevant suppressed inflationary hubble pages | non_dup | [] |
24938296 | 10.1007/JHEP10(2013)174 | Neutrino mass hierarchy can be measured in atmospheric neutrino experiments
through the observation of earth matter effects. Magnetized iron calorimeters
have been shown to be good in this regard due to their charge identification
capabilities. The charged current interaction of $\nu_\mu$ in this detector,
produces a muon track and a hadron shower. The direction of the muon track can
be measured very accurately. We show the improvement expected in the reach of
this class of experiments to the neutrino mass hierarchy, as we improve the
muon energy resolution and the muon reconstruction efficiency. We next propose
to include the hadron events in the analysis, by tagging them with the zenith
angle of the corresponding muon and binning the hadron data first in energy and
then in zenith angle. To the best of our knowledge this way of performing the
analysis of the atmospheric neutrino data has not be considered before. We show
that the hadron events increase the mass hierarchy sensitivity of the
experiment. Finally, we show the expected mass hierarchy sensitivity in terms
of the reconstructed neutrino energy and zenith angle. We show how the detector
resolutions spoil the earth matter effects in the neutrino channel and argue
why the sensitivity obtained from the neutrino analysis cannot be significantly
better than that obtained from the analysis using muon data alone. As a result,
the best mass hierarchy sensitivity is obtained when we add the contribution of
the muon and the hadron data. For $\sin^22\theta_{13}=0.1$,
$\sin^2\theta_{23}=0.5$, a muon energy resolution of 2\%, reconstruction
efficiency of 80\% and exposure of $50\times 10$ kton-year, we could get up to
$4.5\sigma$ signal for the mass hierarchy from combining the muon and hadron
data.Comment: 29 page | Measuring the Mass Hierarchy with Muon and Hadron Events in Atmospheric
Neutrino Experiments | measuring the mass hierarchy with muon and hadron events in atmospheric neutrino experiments | hierarchy earth effects. magnetized iron calorimeters regard capabilities. produces muon track hadron shower. muon track accurately. hierarchy muon muon reconstruction efficiency. propose hadron tagging zenith muon binning hadron zenith angle. performing before. hadron hierarchy experiment. hierarchy reconstructed zenith angle. resolutions spoil earth argue muon alone. hierarchy muon hadron data. theta theta muon reconstruction kton sigma hierarchy combining muon hadron | non_dup | [] |
24951827 | 10.1007/JHEP10(2013)176 | We show that vector-like fermions can act as the dark matter candidate in the
universe whilst also playing a crucial role in electroweak baryogenesis through
contributing to the barrier in the one-loop thermal scalar potential. In order
for the new fermions to give rise to a strong first order phase transition, we
show that one requires rather large Yukawa couplings in the new sector, which
are strongly constrained by electroweak precision tests and perturbativity.
Strong couplings between the dark matter candidate and the Higgs boson
intuitively lead to small values of the relic density and problems with dark
matter direct detection bounds. Nevertheless, when considering the most general
realisation of the model, we find regions in the parameter space that respect
all current constraints and may explain both mysteries simultaneously.Comment: 21 pages, 11 figures, references added, includes discussion of vacuum
stability, matches published versio | Baryogenesis and Dark Matter with Vector-like Fermions | baryogenesis and dark matter with vector-like fermions | fermions candidate universe whilst playing crucial electroweak baryogenesis contributing barrier potential. fermions yukawa couplings constrained electroweak precision perturbativity. couplings candidate boson intuitively relic bounds. nevertheless realisation mysteries pages matches versio | non_dup | [] |
24956280 | 10.1007/JHEP10(2013)177 | We confront the problem of giving a fundamental definition to perturbative
string theory in spacetimes with totally compact space (taken to be a torus for
simplicity, though the nature of the problem is very general) and non-compact
time. Due to backreaction induced by the presence of even a single string
quantum, the usual formulation of perturbative string theory in a fixed
classical background is infrared-divergent at all subleading orders in the
string coupling, and needs to be amended. The problem can be seen as a closed
string analogue of D0-brane recoil under an impact by closed strings (a
situation displaying extremely similar infrared divergences). Inspired by the
collective coordinate treatment of the D0-brane recoil, whereby the
translational modes of the D0-brane are introduced as explicit dynamical
variables in the path integral, we construct a similar formalism for the case
of string-induced gravitational backreaction, in which the spatially uniform
modes of the background fields on the compact space are quantized explicitly.
The formalism can equally well be seen as an ultraviolet completion of a
minisuperspace quantum cosmology with string degrees of freedom. We consider
the amplitudes for the universe to have two cross-sections with specified
spatial properties and string contents, and show (at the first non-trivial
order) that they are finite within our formalism.Comment: 37 pages, 4 figures; v2: cosmetic changes, published versio | Strings in compact cosmological spaces | strings in compact cosmological spaces | confront giving perturbative spacetimes totally torus simplicity time. backreaction usual formulation perturbative infrared divergent subleading orders amended. analogue brane recoil strings displaying extremely infrared divergences inspired collective coordinate brane recoil whereby translational brane formalism gravitational backreaction spatially quantized explicitly. formalism equally ultraviolet completion minisuperspace cosmology freedom. amplitudes universe specified contents trivial pages cosmetic versio | non_dup | [] |
24950428 | 10.1007/JHEP10(2013)178 | We derive exact formulae for the partition function and the expectation
values of Wilson/'t Hooft loops, thus directly checking their S-duality
transformations. We focus on a special class of N=2 gauge theories on S^4 with
fundamental matter. In particular we show that, for a specific choice of the
masses, the matrix model integral defining the gauge theory partition function
localizes around a finite set of critical points where it can be explicitly
evaluated and written in terms of generalized hypergeometric functions. From
the AGT perspective the gauge theory partition function, evaluated with this
choice of masses, is viewed as a four point correlator involving the insertion
of a degenerated field. The well known simplicity of the degenerated correlator
reflects the fact that for these choices of masses only a very restrictive type
of instanton configurations contributes to the gauge theory partition function.Comment: 30 pages, 4 figures. reference added, typos corrected. version
accepted for publication on JHE | Exact results in N=2 gauge theories | exact results in n=2 gauge theories | derive formulae partition expectation wilson hooft loops checking duality transformations. matter. defining partition localizes explicitly hypergeometric functions. perspective partition viewed correlator involving insertion degenerated field. simplicity degenerated correlator reflects choices restrictive instanton configurations contributes partition pages figures. typos corrected. publication | non_dup | [] |
24962331 | 10.1007/JHEP10(2013)179 | We explore the properties of non-BPS multi-centre extremal black holes in
ungauged N=2 supergravity coupled to n_v vector multiplets, as described by
solutions to the composite non-BPS linear system. After setting up an explicit
description that allows for arbitrary non-BPS charges to be realised at each
centre, we study the structure of the resulting solutions. Using these results,
we prove that the binding energy of the composite is always positive and we
show explicitly the existence of walls of marginal stability for generic
choices of charges. The two-centre solutions only exist on a hypersurface of
dimension n_v+1 in moduli space, with an n_v-dimensional boundary, where the
distance between the centres diverges and the binding energy vanishes.Comment: 54 pages, 1 figur | non-BPS walls of marginal stability | non-bps walls of marginal stability | explore extremal holes ungauged supergravity multiplets composite system. charges realised solutions. composite explicitly walls marginal generic choices charges. hypersurface moduli centres diverges pages figur | non_dup | [] |
24950378 | 10.1007/JHEP10(2013)180 | Modular invariance is known to constrain the spectrum of 2d conformal field
theories. We investigate this constraint systematically, using the linear
functional method to put new improved upper bounds on the lowest gap in the
spectrum. We also consider generalized partition functions of N = (2,2)
superconformal theories and discuss the application of our results to
Calabi-Yau compactifications. For Calabi-Yau threefolds with no enhanced
symmetry we find that there must always be non-BPS primary states of weight 0.6
or less.Comment: 41 pages, 5 figure | Constraints on 2d CFT partition functions | constraints on 2d cft partition functions | modular invariance constrain conformal theories. systematically bounds spectrum. partition superconformal calabi compactifications. calabi threefolds pages | non_dup | [] |
24946388 | 10.1007/JHEP10(2013)181 | We study a set of examples of holographic duals to theories with spontaneous
breaking of conformal invariance in different dimensions. The geometries are
domain walls interpolating between two AdS spaces, with a non-trivial
background scalar field dual to a relevant operator. We comment on a subtlety
in the low momentum expansion pointed out in arXiv:1304.3051 for the case of
background gravity and revise the dynamical gravity results of arXiv:1207.0006,
where the dilaton pole was missing in the scalar-scalar and tensor-tensor
two-point functions. We compute the energy-momentum tensor and scalar two-point
functions and show that there is indeed a massless dilaton pole.Comment: 28 pages. v2: references added. v3: published version in JHE | The holographic dilaton | the holographic dilaton | holographic duals spontaneous breaking conformal invariance dimensions. geometries walls interpolating trivial operator. comment subtlety pointed revise dilaton pole missing functions. massless dilaton pages. added. | non_dup | [] |
24953956 | 10.1007/JHEP10(2013)184 | We find broad classes of exact 4-dimensional asymptotically flat black hole
solutions in Einstein-Maxwell theories with a non-minimally coupled dilaton and
its non-trivial potential. We consider a few interesting limits, in particular,
a regular generalization of the dilatonic Reissner-Nordstr{\"o}m solution and,
also, smooth deformations of supersymmetric black holes. Further examples are
provided for more general dilaton potentials. We discuss the thermodynamical
properties and show that the first law is satisfied. In the non-extremal case
the entropy depends, as expected, on the asymptotic value of the dilaton. In
the extremal limit, the entropy is determined purely in terms of charges and is
independent of the asymptotic value of the dilaton. The attractor mechanism can
be used as a criterion for the existence of the regular solutions. Since there
is a `competition' between the effective potential and dilaton potential, we
also obtain regular extremal black hole solutions with just one U(1) gauge
field turned on.Comment: 19 pages, no figures; v2: comments and refs. added, matches the
published versio | Exact asymptotically flat charged hairy black holes with a dilaton
potential | exact asymptotically flat charged hairy black holes with a dilaton potential | broad asymptotically einstein maxwell minimally dilaton trivial potential. generalization dilatonic reissner nordstr deformations supersymmetric holes. dilaton potentials. thermodynamical satisfied. extremal asymptotic dilaton. extremal purely charges asymptotic dilaton. attractor criterion solutions. competition dilaton extremal turned pages comments refs. matches versio | non_dup | [] |
24947050 | 10.1007/JHEP10(2013)186 | We construct the three-dimensional effective field theory which reproduces
low-momentum static correlation functions in four-dimensional quantum field
theories with U(1) axial anomalies and a dynamical vector gauge field, in
thermal equilibrium. We compute radiative corrections to parity-violating
chiral conductivities, to leading order in the effective theory. All of the
anomaly-induced transport is susceptible to radiative corrections, except for
certain two-point functions which are required by symmetry to vanish.Comment: 53 pages, 2 figure | Chiral conductivities and effective field theory | chiral conductivities and effective field theory | reproduces axial anomalies equilibrium. radiative parity violating chiral conductivities theory. anomaly susceptible radiative pages | non_dup | [] |
24933418 | 10.1007/JHEP10(2013)187 | The pair production of squarks is one of the main search channels for
supersymmetry at the LHC. We present a fully differential calculation of the
next-to-leading order (NLO) SUSY-QCD corrections to the on-shell production of
a pair of squarks in the Minimal Supersymmetric Standard Model (MSSM),
supplemented by the leading-order decay of the squarks to the lightest
neutralino and a quark. In addition, we use the Powheg method to match our NLO
calculation with parton showers. To this end, the process was implemented in
the Powheg-Box framework and interfaced with Pythia6 and Herwig++. We study the
differential scale dependence and K-factors, and investigate the effects of the
parton showers for a benchmark scenario in the constrained MSSM.Comment: 42 pages, 21 figures, reference added, minor typos corrected, version
accepted by JHE | Matching Squark Pair Production at NLO with Parton Showers | matching squark pair production at nlo with parton showers | squarks supersymmetry lhc. susy squarks supersymmetric mssm supplemented squarks lightest neutralino quark. powheg match parton showers. implemented powheg interfaced pythia herwig parton showers benchmark constrained pages minor typos corrected | non_dup | [] |
24947350 | 10.1007/JHEP10(2013)188 | Explicit expressions for one-loop five supergraviton scattering amplitudes in
both type II superstring theories are determined by making use of the pure
spinor formalism. The type IIB amplitude can be expressed in terms of a
doubling of ten-dimensional super Yang--Mills tree amplitude, while the type
IIA amplitude has additional pieces that cannot be expressed in that manner. We
evaluate the coefficients of terms in the analytic part of the low energy
expansion of the amplitude, which correspond to a series of terms in an
effective action of the schematic form D^{2k}R^5 for 0\le k \le 5 (where R is
the Riemann curvature). Comparison with earlier analyses of the tree amplitudes
and of the four-particle one-loop amplitude leads to an interesting extension
of the action of SL(2,Z) S-duality on the moduli-dependent coefficients in the
type IIB theory. We also investigate closed-string five-particle amplitudes
that violate conservation of the U(1) R-symmetry charge -- processes that are
forbidden in supergravity. The coefficients of their low energy expansion are
shown to agree with S-duality systematics. A less detailed analysis is also
given of the six-point function, resulting in the vanishing of the analytic
parts of the R^6 and D^4 R^6 interactions in the ten-dimensional effective
action, but not in lower dimensions.Comment: 62 pages, Mathematica notebook on integral expansion included in
submission. v2: minor modifications, references added, matches published
versio | Multiparticle one-loop amplitudes and S-duality in closed superstring
theory | multiparticle one-loop amplitudes and s-duality in closed superstring theory | expressions supergraviton amplitudes superstring spinor formalism. doubling super mills pieces manner. analytic schematic riemann curvature amplitudes duality moduli theory. amplitudes violate conservation forbidden supergravity. agree duality systematics. vanishing analytic pages mathematica notebook submission. minor modifications matches versio | non_dup | [] |
24961545 | 10.1007/JHEP10(2013)190 | We show that both perturbative and non-perturbative parts of universal
partition functions of Chern-Simons theory on 3d sphere are ratios of four over
four Barnes' quadruple gamma functions with arguments given by linear
combinations of universal parameters. Since nonperturbative part of partition
function is essentially a universal compact simple Lie group's volume, latter
appears to be expressed through quadruple Barnes' functions, also. For SU(N)
values of parameters recurrent relations on Barnes' functions give the proof of
level-rank duality of complete partition function, thus extending that duality
on non-integer level and rank. We note that integral representation of
universal partition function is defined on few disjoint regions in parameters'
space, corresponding to different signs of real parts of parameters, and
introduce a framework for discussion of analytic continuation of partition
functions(s) from these regions. Although initial integral representation is
symmetric under all permutations of parameters (which corresponds particularly
to $N \rightarrow -N$ duality of gauge theories with classical groups),
analytic continuations are not symmetric under transposition of parameters with
different signs of their real parts. For the particular case of SU(N)
Chern-Simons this asymmetry appears to be the Kinkelin's functional equation
(reflection relation) for Barnes' G-function.Comment: 15 page | Universal Chern-Simons partition functions as quadruple Barnes'
gamma-functions | universal chern-simons partition functions as quadruple barnes' gamma-functions | perturbative perturbative universal partition chern simons sphere barnes quadruple gamma arguments combinations universal parameters. nonperturbative partition essentially universal quadruple barnes also. recurrent barnes duality partition extending duality integer rank. universal partition disjoint signs analytic continuation partition regions. permutations rightarrow duality analytic continuations transposition signs parts. chern simons asymmetry kinkelin reflection barnes | non_dup | [] |
24949768 | 10.1007/JHEP10(2013)191 | Squeezed supersymmetric spectra are challenging for the LHC searches based on
a sizable missing energy and hard visible particles. One such scenario consists
of chargino/second-lightest neutralino NLSPs and a lightest neutralino LSP with
a relatively small mass gap (10-50GeV). In this note, we explore search
strategies to better probe this parameter space. We focus on the three-lepton
plus missing energy channel arising from the chargino/second-lightest
neutralino associated production, and we investigate the role of a relatively
hard initial state radiation (ISR) jet. In addition to typical kinematic
variables, such as the minimum lepton pair invariant mass, we propose an
angular separation variable and two ratio variables which capitalize on the
main kinematic features; leptons stay relatively soft under the boost from ISR
and a sizable missing energy arises only in tight correlation with the ISR
boost. With 300/fb of data at the 14 TeV LHC, we expect to probe
electroweakinos up to 320 (700) GeV with 30GeV mass-gap and up to 220 (620) GeV
with 20GeV mass-gap if gauginos decay via gauge bosons (light sleptons). We
emphasize that the three-lepton channel is technically challenging for mass-gap
below 12GeV.Comment: 23 pages, 9 figure | Cornering electroweakinos at the LHC | cornering electroweakinos at the lhc | squeezed supersymmetric challenging searches sizable missing visible particles. chargino lightest neutralino nlsps lightest neutralino explore space. lepton missing arising chargino lightest neutralino jet. kinematic lepton propose capitalize kinematic leptons stay boost sizable missing arises tight boost. electroweakinos gauginos bosons sleptons emphasize lepton technically challenging pages | non_dup | [] |
24958974 | 10.1007/JHEP10(2013)192 | It has been suggested that for QCD at finite baryon density the distribution
of the phase angle, i.e. the angle defined as the imaginary part of the
logarithm of the fermion determinant, has a simple Gaussian form. This
distribution provides the density in the density of states approach to the sign
problem. We calculate this phase angle distribution using i) the hadron
resonance gas model; and ii) a combined strong coupling and hopping parameter
expansion in lattice gauge theory. While the former model leads only to a
Gaussian distribution, in the latter expansion we discover terms which cause
the phase angle distribution to deviate, by relative amounts proportional to
powers of the inverse lattice volume, from a simple Gaussian form. We show that
despite the tiny inverse-volume deviation of the phase angle distribution from
a simple Gaussian form, such non-Gaussian terms can have a substantial impact
on observables computed in the density of states/reweighting approach to the
sign problem.Comment: 43 pages, 4 figure | The density in the density of states method | the density in the density of states method | baryon i.e. imaginary logarithm fermion determinant form. problem. hadron hopping theory. former discover deviate amounts powers form. tiny substantial observables reweighting pages | non_dup | [] |
24953741 | 10.1007/JHEP10(2013)194 | Five dimensional Einstein gravity vacuum solutions in general fall into two
classes of black rings with horizon topology S^2 \times S^1, and black holes
with horizon topology S^3. These solutions are specified by their mass and two
spins. There are "overlapping" regions of this parameter space where one has
extremal rings and holes of the same spins. We show that for such regions the
hole has generically a larger entropy than the ring, and likewise, the central
charge of the proposed chiral 2d CFT dual to the hole is larger than that of
the ring. For special places of this overlapping region where one of the spins
tends to zero, the entropies of the extremal ring and hole also tend to zero
and essentially become equal. In this case we are dealing with Extremal
Vanishing Horizon (EVH) black holes or rings. The near horizon geometry of the
near-EVH hole and rings both contain locally AdS_3 throats, providing a basis
for the EVH/CFT proposal, a 2d CFT description of the low energy excitations of
EVH hole or ring. We argue how the near-EVH hole and near-EVH ring can be
distinguished from this dual 2d CFT viewpoint: The hole is a thermal state with
zero temperature in the left sector and finite temperature in the right, while
the ring is a generic state in the ground state (of the CFT on the plane) in
the left sector and a thermal state in the right. The latter is part of the
Hilbert space of the 2d CFT obtained in the Discrete Light Cone Quantization
(DLCQ).Comment: 21 pages, 2 figures. v2, accepted in JHE | Dual 2d CFT Identification of Extremal Black Rings from Holes | dual 2d cft identification of extremal black rings from holes | einstein fall rings horizon topology holes horizon topology specified spins. overlapping extremal rings holes spins. generically likewise chiral ring. places overlapping spins tends entropies extremal tend essentially equal. dealing extremal vanishing horizon holes rings. horizon rings locally throats proposal excitations ring. argue distinguished viewpoint generic right. hilbert cone quantization dlcq .comment pages figures. | non_dup | [] |
24933818 | 10.1007/JHEP10(2013)195 | In this paper we treat the black hole horizon as a physical boundary to the
spacetime and study its dynamics following from the Gibbons-Hawking-York
boundary term. Using the Kerr black hole as an example we derive an effective
action that describes, in the large wave number limit, a massless Klein-Gordon
field living on the average location of the boundary. Complete solutions can be
found in the small rotation limit of the black hole. The formulation suggests
that the boundary can be treated in the same way as any other matter
contributions. In particular, the angular momentum of the boundary matches
exactly with that of the black hole, suggesting an interesting possibility that
all charges (including the entropy) of the black hole are carried by the
boundary. Using this as input, we derive predictions on the Planck scale
properties of the boundary.Comment: References added, nature of boundary stress tensor clarified,
discussion of statistics refined and a mistake with Hawking temperature
corrected, 16 pages; version to appear in journa | Fluctuating Black Hole Horizons | fluctuating black hole horizons | treat horizon spacetime gibbons hawking term. kerr derive describes massless klein gordon living boundary. hole. formulation contributions. matches charges boundary. derive planck clarified refined mistake hawking corrected pages journa | non_dup | [] |
24944297 | 10.1007/JHEP10(2013)196 | We propose a new type of radiative seesaw model in which observed neutrino
masses are generated through a three-loop level diagram in combination with
tree-level type-II seesaw mechanism in a renormalizable theory. We introduce a
Non-abelian flavor symmetry $T_7$ in order to constrain the form of Yukawa
interactions and Higgs potential. Although several models based on a
Non-abelian flavor symmetry predict the universal coupling constants among the
standard model like Higgs boson and charged leptons, which is disfavored by the
current LHC data, our model can avoid such a situation. We show a benchmark
parameter set that is consistent with the current experimental data, and we
discuss multi-muon events as a key collider signature to probe our model.Comment: Footnote 6 is slightly modifie | $T_7$ Flavor Model in Three Loop Seesaw and Higgs Phenomenology | $t_7$ flavor model in three loop seesaw and higgs phenomenology | propose radiative seesaw seesaw renormalizable theory. abelian flavor constrain yukawa potential. abelian flavor predict universal boson leptons disfavored avoid situation. benchmark muon collider signature footnote modifie | non_dup | [] |
24935637 | 10.1007/JHEP10(2013)198 | We work out Seiberg-like dualities for 3d $\mathcal{N}=2$ theories with SU(N)
gauge group. We use the $SL(2,\mathbb{Z})$ action on 3d conformal field
theories with U(1) global symmetry. One of generator S of $SL(2,\mathbb{Z})$
acts as gauging of the U(1) global symmetry. Utilizing $S=S^{-1}$ up to charge
conjugation, we obtain Seiberg-like dual of SU(N) theories by gauging
topological U(1) symmetry of the Seiberg-like dual of U(N) theories with the
same matter content. We work out the Aharony dualities for SU(N) gauge theory
with $N_f$ fundamental/anti-fundamnetal flavors, with/without one adjoint
matter with the superpotential. We also work out the Giveon-Kutasov dualities
for SU(N) gauge theory with Chern-Simons term and with $N_f$
fundamental/anti-fundamental flavors. For all the proposed dualities, we give
various evidences such as chiral ring matching and the superconformal index
computations. We find the perfect matchings.Comment: 29 pages; SU(N) dual with N_f=N_c clarifie | Seiberg-like Dualities for 3d N=2 Theories with SU(N) gauge group | seiberg-like dualities for 3d n=2 theories with su(n) gauge group | seiberg dualities mathcal group. mathbb conformal symmetry. generator mathbb acts gauging symmetry. utilizing conjugation seiberg gauging topological seiberg content. aharony dualities fundamnetal flavors adjoint superpotential. giveon kutasov dualities chern simons flavors. dualities evidences chiral matching superconformal computations. perfect pages clarifie | non_dup | [] |
24955086 | 10.1007/JHEP10(2013)200 | The Super-light Sterile Neutrino Scenario (SSNS) has been proposed in the
literature to explain the suppression of the upturn in the low energy solar
data. In this scenario, the mass splitting between the new mass eigenstate,
$\nu_0$ and the standard $\nu_1$ is of order of $\Delta m_{01}^2\sim 10^{-5}$
eV$^2$. Reactor neutrino experiments with baseline larger than $\sim$20 km can
help us to probe this scenario. We study the potential of upcoming JUNO and
RENO-50 reactor experiments for discovering the superlight sterile neutrino or
constraining its mixing parameters. We study the dependence of sensitivity to
the SNSS and find that the proposed JUNO setup is very close to the optimal
setup for probing the SSNS.Comment: 12 pages, 5 figure | Constraining Super-light Sterile Neutrino Scenario by JUNO and RENO-50 | constraining super-light sterile neutrino scenario by juno and reno-50 | super sterile ssns suppression upturn data. splitting eigenstate delta reactor scenario. upcoming juno reno reactor discovering superlight sterile constraining parameters. snss juno setup setup probing pages | non_dup | [] |
24939634 | 10.1007/JHEP10(2013)201 | Some aspects of string compactifications with non-geometric fluxes are
revisited in the light of recent progress in double field theory. After
rederiving the general form of these fluxes, we consider the proposed flux
induced four-dimensional effective superpotential and oxidize its induced
scalar potential to terms in a ten-dimensional action. This analysis is
performed independently for an explicit toroidal type IIA and its T-dual type
IIB orientifold. We show in detail that the result of this bottom-up approach
is compatible with the gauged supergravity motivated flux formulation of the
double field theory action in both the NS-NS and the R-R sector.Comment: 34 pages, v2: typos corrected, refs added, v3: major revision of the
introduction and sec.(2.5), final version to be publishe | Dimensional Oxidation of Non-geometric Fluxes in Type II Orientifolds | dimensional oxidation of non-geometric fluxes in type ii orientifolds | compactifications geometric fluxes revisited progress theory. rederiving fluxes superpotential oxidize action. independently toroidal orientifold. compatible gauged supergravity motivated formulation pages typos corrected refs revision sec. publishe | non_dup | [] |
24933961 | 10.1007/JHEP10(2013)202 | We analyze the properly normalized three-point correlator of two protected
scalar operators and one higher spin twist-two operator in N=4 super
Yang-Mills, in the limit of large spin j. The relevant structure constant can
be extracted from the OPE of the four-point correlator of protected scalar
operators. We show that crossing symmetry of the four point correlator plus a
judicious guess for the perturbative structure of the three-point correlator,
allow to make a prediction for the structure constant at all loops in
perturbation theory, up to terms that remain finite as the spin becomes large.
Furthermore, the expression for the structure constant allows to propose an
expression for the all loops four-point correlator G(u,v), in the limit u,v ->
0. Our predictions are in perfect agreement with the large j expansion of
results available in the literature.Comment: 14 pages,v2:minor changes, refs adde | Higher-spin correlators | higher-spin correlators | analyze properly correlator protected twist super mills correlator protected operators. crossing correlator judicious guess perturbative correlator loops perturbation large. propose loops correlator perfect pages minor refs adde | non_dup | [] |
24959568 | 10.1007/JHEP10(2013)203 | In this paper we study the coupled system of non-abelian gauge fields with
higher-derivative gravity. Charge renormalization is investigated in this
coupled system. It is found that the leading term in the gauge coupling beta
function comes due to interaction of gauge fields with gravitons. This is shown
to be a universal quantity in the sense that it doesn't depend on the gauge
coupling and the gauge group, but may depend on the other couplings of the
action (gravitational and matter). The coupled system is studied at one-loop.
It is found that the leading term of gauge beta function is zero at one-loop in
four dimensions. The effect of gauge fields on the running of gravitational
couplings is investigated. The coupled system of gauge field with
higher-derivative gravity is shown to satisfy unitarity when quantum
corrections are taken in to account. Moreover, it is found that Newton constant
goes to zero at short distances. In this renormalizable and unitary theory of
gauge field coupled with higher-derivative gravity, the leading term of the
gauge beta function, found to be universal for all gauge groups, is further
studied in more detail by isolating it in the context of abelian gauge theories
coupled with gravity in four dimensions. Using self-duality of abelian gauge
theories in four dimensions, this term of the gauge beta function is shown to
be zero to all loops. This is found to be independent of the gravity action,
regularization scheme and gauge fixing condition. An explicit one-loop
computation for arbitrary gravity action further demonstrates the vanishing of
this term in the gauge beta function in four dimensions, independent of the
regularization scheme and gauge fixing condition. Consequences of this are
discussed.Comment: 1+42 pages, 7 figure | Running Couplings in Quantum Theory of Gravity Coupled with Gauge Fields | running couplings in quantum theory of gravity coupled with gauge fields | abelian gravity. renormalization system. beta comes gravitons. universal quantity couplings gravitational loop. beta dimensions. running gravitational couplings investigated. satisfy unitarity account. newton goes distances. renormalizable unitary beta universal isolating abelian dimensions. duality abelian beta loops. regularization fixing condition. demonstrates vanishing beta regularization fixing condition. consequences pages | non_dup | [] |
24957869 | 10.1007/JHEP10(2013)204 | We extend the Helac-Dipoles package with the implementation of a new
subtraction formalism, first introduced by Nagy and Soper in the formulation of
an improved parton shower. We discuss a systematic, semi-numerical approach for
the evaluation of the integrated subtraction terms for both massless and
massive partons, which provides the missing ingredient for a complete
implementation. In consequence, the new scheme can now be used as part of a
complete NLO QCD calculation for processes with arbitrary parton masses and
multiplicities. We assess its overall performance through a detailed comparison
with results based on Catani-Seymour subtraction. The importance of random
polarization and color sampling of the external partons is also examined.Comment: 37 pages, 8 tables, 3 figures. References added, version to appear in
JHE | Complete Nagy-Soper subtraction for next-to-leading order calculations
in QCD | complete nagy-soper subtraction for next-to-leading order calculations in qcd | extend helac dipoles package subtraction formalism nagy soper formulation parton shower. subtraction massless massive partons missing ingredient implementation. parton multiplicities. catani seymour subtraction. partons pages tables figures. | non_dup | [] |
24938705 | 10.1007/JHEP10(2013)205 | We utilize the deformation theory of algebraic singularities to study charged
matter in compactifications of M-theory, F-theory, and type IIa string theory
on elliptically fibered Calabi-Yau manifolds. In F-theory, this description is
more physical than that of resolution. We describe how two-cycles can be
identified and systematically studied after deformation. For ADE singularities,
we realize non-trivial ADE representations as sublattices of Z^N, where N is
the multiplicity of the codimension one singularity before deformation. We give
a method for the determination of Picard-Lefschetz vanishing cycles in this
context and utilize this method for one-parameter smooth deformations of ADE
singularities. We give a general map from junctions to weights and demonstrate
that Freudenthal's recursion formula applied to junctions correctly reproduces
the structure of high-dimensional ADE representations, including the 126 of
SO(10) and the 43,758 of E_6. We identify the Weyl group action in some
examples, and verify its order in others. We describe the codimension two
localization of matter in F-theory in the case of heterotic duality or simple
normal crossing and demonstrate the branching of adjoint representations.
Finally, we demonstrate geometrically that deformations correctly reproduce the
appearance of non-simply-laced algebras induced by monodromy around codimension
two singularities, showing the reduction of D_4 to G_2 in an example. A
companion mathematical paper will follow.Comment: 30 pages + references, appendices. v2: references and two figures
added, typos correcte | Matter From Geometry Without Resolution | matter from geometry without resolution | utilize deformation algebraic singularities compactifications elliptically fibered calabi manifolds. resolution. cycles systematically deformation. singularities realize trivial representations sublattices multiplicity codimension singularity deformation. picard lefschetz vanishing cycles utilize deformations singularities. junctions weights freudenthal recursion junctions correctly reproduces representations weyl verify others. codimension localization heterotic duality crossing branching adjoint representations. geometrically deformations correctly reproduce appearance laced algebras monodromy codimension singularities example. companion mathematical pages appendices. typos correcte | non_dup | [] |
24948342 | 10.1007/JHEP10(2013)207 | Using the framework of collinear factorization in perturbative QCD (pQCD), we
analyze the recent data of the LHCb and ALICE collaborations on exclusive
photoproduction of J/{\psi} in ultraperipheral pp and AA collisions,
respectively. We demonstrate that the simultaneous analysis of the proton and
Pb data allows us to reduce the ambiguity of the pQCD description of the
$\gamma p \to J/\psi p$ and $\gamma A \to J/\psi p$ cross sections and, hence,
to place additional constraints on the gluon distributions in the nucleon and
nuclei at small x. We also make predictions for the cross section of coherent
exclusive photoproduction of J/{\psi} in nucleus-nucleus ultraperipheral
collisions accompanied by the electromagnetic excitation of nuclei and the
subsequent neutron emission.Comment: 21 pages, 8 figures, 3 tables. The final version matching the
published pape | Exclusive J/{\psi} production in ultraperipheral collisions at the LHC:
constrains on the gluon distributions in the proton and nuclei | exclusive j/{\psi} production in ultraperipheral collisions at the lhc: constrains on the gluon distributions in the proton and nuclei | collinear factorization perturbative pqcd analyze lhcb alice collaborations exclusive photoproduction ultraperipheral collisions respectively. simultaneous proton ambiguity pqcd gamma gamma gluon nucleon nuclei coherent exclusive photoproduction nucleus nucleus ultraperipheral collisions accompanied electromagnetic nuclei neutron pages tables. matching pape | non_dup | [] |
24944147 | 10.1007/JHEP10(2013)210 | In this paper, we derive the field equations of quartic quasi-topological
gravity by varying the action with respect to the metric. Also, we obtain the
linearized graviton equations in the AdS background and find that it is
governed by a second-order field equation as in the cases of Einstein, Lovelock
or cubic quasi-topological gravities. But in contrast to the cubic
quasi-topological gravity, the linearized field equation around a black hole
has fourth-order radial derivative of the perturbation. Moreover, we analyze
the conditions of having ghost free AdS solutions and AdS planar black holes.
In addition, we compute the central charges of the dual conformal field theory
of this gravity theory by studying holographic Weyl anomaly. Finally, we
consider the effect of quartic term on the causality of dual theory in the
tensor channel and show that, in the contrast to the trivial result of cubic
quasi-topological gravity, the existence of both cubic and quartic terms leads
to a non-trivial constraint. However, this constraint does not imply any lower
positive bound on the viscosity/entropy ratio.Comment: 27 pages, 14 figures, minor typos corrected, a comment on bulk
causality is added, updated to published versio | Quartic Quasi-topological Gravity, Black Holes and Holography | quartic quasi-topological gravity, black holes and holography | derive quartic quasi topological metric. linearized graviton governed einstein lovelock cubic quasi topological gravities. cubic quasi topological linearized fourth perturbation. analyze ghost planar holes. charges conformal studying holographic weyl anomaly. quartic causality trivial cubic quasi topological cubic quartic trivial constraint. imply viscosity pages minor typos corrected comment causality updated versio | non_dup | [] |
24955958 | 10.1007/JHEP10(2013)211 | As evidence for the ER=EPR conjecture, it has recently been observed that the
string that is holographically dual to an entangled quark-antiquark pair
separating with (asymptotically) uniform acceleration has a wormhole on its
worldsheet. We point out that a two-sided horizon and a wormhole actually
appear for much more generic quark-antiquark trajectories, which is consistent
with the fact that the members of an EPR pair need not be permanently out of
causal contact. The feature that determines whether the causal structure of the
string worldsheet is trivial or not turns out to be the emission of gluonic
radiation by the dual quark and antiquark. In the strongly-coupled gauge
theory, it is only when radiation is emitted that one obtains an unambiguous
separation of the pair into entangled subsystems, and this is what is reflected
on the gravity side by the existence of the worldsheet horizon.Comment: 1+17+5 pages, 9 figures, v2: added refs, v3: small additions, matches
published versio | Holographic EPR Pairs, Wormholes and Radiation | holographic epr pairs, wormholes and radiation | conjecture holographically entangled antiquark separating asymptotically acceleration wormhole worldsheet. sided horizon wormhole generic antiquark trajectories permanently causal contact. determines causal worldsheet trivial turns gluonic antiquark. emitted obtains unambiguous entangled subsystems reflected worldsheet pages refs additions matches versio | non_dup | [] |
24958995 | 10.1007/JHEP10(2013)213 | Inspired by the recent measurements of the CMS collaboration, we report a QCD
study of dijet production in proton+lead collisions at the LHC involving
large-transverse-momentum jets, $p_T \gtrsim 100$ GeV. Examining the inherent
uncertainties of the next-to-leading order perturbative QCD calculations and
their sensitivity to the free proton parton distributions (PDFs), we observe a
rather small, typically much less than 5% clearance for the shape of the dijet
rapidity distribution within approximately 1.5 units around the midrapidity.
Even a more stable observable is the ratio between the yields in the positive
and negative dijet rapidity, for which the baseline uncertainty can be made
negligible by imposing a symmetric jet rapidity acceptance. Both observables
prove sensitive to the nuclear modifications of the gluon distributions, the
corresponding uncertainties clearly exceeding the estimated baseline
uncertainties from the free-proton PDFs and scale dependence. From a
theoretical point of view, these observables are therefore very suitable for
testing the validity of the collinear factorization and have a high potential
to provide precision constraints for the nuclear PDFs.Comment: 16 pages. The version to be published. Figures 6 and 7 replaced. Some
further discussion adde | A perturbative QCD study of dijets in p+Pb collisions at the LHC | a perturbative qcd study of dijets in p+pb collisions at the lhc | inspired dijet proton collisions involving jets gtrsim gev. examining inherent perturbative proton parton pdfs clearance dijet rapidity midrapidity. observable dijet rapidity negligible imposing rapidity acceptance. observables modifications gluon exceeding proton pdfs dependence. observables validity collinear factorization precision pages. published. replaced. adde | non_dup | [] |
24946922 | 10.1007/JHEP10(2013)215 | In this note we study the applicability of the color-kinematics duality to
the scattering of two distinguishable scalar matter particles with gluon
emission in QCD, or graviton emission in Einstein gravity. Previous analysis
suggested that direct use of the Bern-Carrasco-Johansson double-copy
prescription to matter amplitudes does not reproduce the gravitational
amplitude in multi-Regge kinematics. This situation, however, can be avoided by
extensions to the gauge theory, while maintaning the same Regge limit. Here we
present two examples of these extensions: the introduction of a scalar contact
interaction and the relaxation of the distinguishability of the scalars. In
both cases new diagrams allow for a full reconstruction of the correct Regge
limit on the gravitational side. Both modifications correspond to theories
obtained by dimensional reduction from higher-dimensional gauge theories.Comment: 16 pages, 1 figure; v2 minor changes, typos corrected. It matches the
version published in JHE | Color-Kinematics Duality in Multi-Regge Kinematics and Dimensional
Reduction | color-kinematics duality in multi-regge kinematics and dimensional reduction | applicability kinematics duality distinguishable gluon graviton einstein gravity. bern carrasco johansson copy prescription amplitudes reproduce gravitational regge kinematics. avoided extensions maintaning regge limit. extensions relaxation distinguishability scalars. diagrams reconstruction regge gravitational side. modifications pages minor typos corrected. matches | non_dup | [] |
24957571 | 10.1007/JHEP10(2013)216 | Motivated by the recent progress of direct search for the productions of stop
pair and sbottom pair at the LHC, we examine the constraints of the search
results on the stop ($\tilde{t}_1$) mass in natural SUSY. We first scan the
parameter space of natural SUSY in the framework of MSSM, considering the
constraints from the Higgs mass, B-physics and electroweak precision
measurements. Then in the allowed parameter space we perform a Monte Carlo
simulation for stop pair production followed by $\tilde{t}_{1} \to t
\tilde{\chi}_{1}^{0}$ or $\tilde{t}_{1} \to b \tilde{\chi}_{1}^{+}$ and sbottom
pair production followed by $\tilde{b}_{1} \to b \tilde{\chi}_{1}^{0}$ or
$\tilde{b}_{1} \to t \tilde{\chi}_{1}^{-}$. Using the combined results of ATLAS
with 20.1 fb$^{-1}$ from the search of $\ell+{\rm jets}+\slashed E_{T}$,
hadronic $t\bar{t}+\slashed E_{T}$ and $2b+\slashed E_{T}$, we find that a stop
lighter than 600 GeV can be excluded at 95% CL in this scenario.Comment: Discussions added, accepted by JHE | Current experimental bounds on stop mass in natural SUSY | current experimental bounds on stop mass in natural susy | motivated progress productions stop sbottom examine stop tilde susy. scan susy mssm electroweak precision measurements. monte carlo stop tilde tilde tilde tilde sbottom tilde tilde tilde tilde atlas jets slashed hadronic slashed slashed stop lighter excluded discussions | non_dup | [] |
24953365 | 10.1007/JHEP10(2013)218 | We study N=2 superconformal theories on Euclidean and Lorentzian
four-manifolds with a view toward applications to holography and localization.
The conditions for supersymmetry are equivalent to a set of differential
constraints including a "generalised" conformal Killing spinor equation
depending on various background fields. We solve these equations in the general
case and give very explicit expressions for the auxiliary fields that we need
to turn on to preserve some supersymmetry. As opposed to what has been observed
for the N=1 case, the conditions for unbroken supersymmetry turn out to be
almost independent of the signature of spacetime, with the exception of few
degenerate cases including the topological twist. Generically, the only
geometrical constraint coming from supersymmetry is the existence of a
conformal Killing vector on the manifold, all other constraints determine the
background auxiliary fields.Comment: 31 pages, v2: minor changes and important references adde | Extended Supersymmetry on Curved Spaces | extended supersymmetry on curved spaces | superconformal euclidean lorentzian manifolds toward holography localization. supersymmetry generalised conformal killing spinor fields. solve expressions auxiliary preserve supersymmetry. opposed unbroken supersymmetry signature spacetime exception degenerate topological twist. generically geometrical coming supersymmetry conformal killing manifold auxiliary pages minor adde | non_dup | [] |
24956055 | 10.1007/JHEP10(2013)219 | Entanglement entropy in a field theory, with a holographic dual, may be
viewed as a quantity which encodes the diffeomorphism invariant bulk gravity
dynamics. This, in particular, indicates that the bulk Einstein equations would
imply some constraints for the boundary entanglement entropy. In this paper we
focus on the change in entanglement entropy, for small but arbitrary
fluctuations about a given state, and analyze the constraints imposed on it by
the perturbative Einstein equations, linearized about the corresponding bulk
state. Specifically, we consider linear fluctuations about BTZ black hole in 3
dimension, pure AdS and AdS Schwarzschild black holes in 4 dimensions and
obtain a diffeomorphism invariant reformulation of linearized Einstein equation
in terms of holographic entanglement entropy. We will also show that
entanglement entropy for boosted subsystems provides the information about all
the components of the metric with a time index.Comment: 21 pages, 4 figures; v2: new reference adde | Entropic Counterpart of Perturbative Einstein Equation | entropic counterpart of perturbative einstein equation | entanglement holographic viewed quantity encodes diffeomorphism dynamics. einstein imply entanglement entropy. entanglement analyze imposed perturbative einstein linearized state. schwarzschild holes diffeomorphism reformulation linearized einstein holographic entanglement entropy. entanglement boosted subsystems pages adde | non_dup | [] |
24930213 | 10.1007/JHEP10(2013)220 | We compute the gravitational entropy of 'spherical Rindler space', a
time-dependent, spherically symmetric generalization of ordinary Rindler space,
defined with reference to a family of observers traveling along non-parallel,
accelerated trajectories. All these observers are causally disconnected from a
spherical region H (a 'hole') located at the origin of Minkowski space. The
entropy evaluates to S = A/4G, where A is the area of the spherical
acceleration horizon, which coincides with the boundary of H. We propose that S
is the entropy of entanglement between quantum gravitational degrees of freedom
supporting the interior and the exterior of the sphere H.Comment: 9 pages, 1 figure; v2: published version including updated reference | The entropy of a hole in spacetime | the entropy of a hole in spacetime | gravitational spherical rindler spherically generalization ordinary rindler observers traveling accelerated trajectories. observers causally disconnected spherical minkowski space. evaluates spherical acceleration horizon coincides propose entanglement gravitational freedom supporting interior exterior sphere pages updated | non_dup | [] |
24939016 | 10.1007/JHEP10(2013)221 | Within the framework of a constrained Minimal Supersymmetric Standard Model
(cMSSM) augmented by an MSSM singlet-pair sector to account for the non-zero
neutrino masses by inverse seesaw mechanism, the lightest supersymmetric
particle (LSP) can be a mixed sneutrino with mass as small as 50 GeV,
satisfying all existing constraints, thus qualifying as a light dark matter
candidate. We study the possibility of the lightest neutral Higgs boson in this
model decaying invisibly into a pair of sneutrino LSPs, thereby giving rise to
novel missing energy signatures at the LHC. We perform a two-parameter global
analysis of the LHC Higgs data available till date to determine the optimal
invisible Higgs branching fraction in this scenario, and obtain a
$2\sigma(1\sigma)$ upper limit of 0.23 (0.12). A detailed cut-based analysis is
carried out thereafter, demonstrating the viability of our proposed signal
vis-a-vis backgrounds at the LHC.Comment: 29 pages, 10 figures and 7 tables. Text and references added, some
numbers changed slightly due to a small error in coding. To appear in JHE | Invisible Higgs Decay in a Supersymmetric Inverse Seesaw Model with
Light Sneutrino Dark Matter | invisible higgs decay in a supersymmetric inverse seesaw model with light sneutrino dark matter | constrained supersymmetric cmssm augmented mssm singlet seesaw lightest supersymmetric sneutrino satisfying qualifying candidate. lightest neutral boson decaying invisibly sneutrino lsps thereby giving missing signatures lhc. till invisible branching sigma sigma thereafter demonstrating viability backgrounds pages tables. changed coding. | non_dup | [] |