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5254370 | 10.1007/JHEP10(2012)040 | We consider the approximate U(2)^3 flavour symmetry exhibited by the quark
sector of the Standard Model and all its possible breaking terms appearing in
the quark Yukawa couplings. Taking an Effective Field Theory point of view, we
determine the current bounds on these parameters, assumed to control the
breaking of flavour in a generic extension of the Standard Model at a reference
scale Lambda. In particular, a significant bound from epsilon'/epsilon is
derived, which is relevant to Minimal Flavour Violation as well. In the
up-quark sector, the recently observed CP violation in D -> pi+ pi-, K+ K-
decays might be accounted for in this generic framework, consistently with any
other constraint.Comment: 15 pages, 1 figur | Less Minimal Flavour Violation | less minimal flavour violation | approximate flavour exhibited breaking appearing yukawa couplings. bounds breaking flavour generic lambda. epsilon epsilon flavour violation well. violation decays accounted generic consistently pages figur | non_dup | [] |
55887342 | 10.1007/JHEP10(2012)042 | The beam-helicity asymmetry in exclusive electroproduction of real photons by the longitudinally polarized HERA positron beam scattering off an unpolarized hydrogen target is measured at HERMES. The asymmetry arises from deeply virtual Compton scattering and its interference with the Bethe-Heitler process. Azimuthal amplitudes of the beam-helicity asymmetry are extracted from a data sample consisting of ep -> ep gamma events with detection of all particles in the final state including the recoiling proton. The installation of a recoil detector, while reducing the acceptance of the experiment, allows the elimination of background from ep -> eN pi gamma events, which was estimated to contribute an average of about 12% to the signal in previous HERMES publications. The removal of this background from the present data sample is shown to increase the magnitude of the leading asymmetry amplitude by 0.054 +/- 0.016 to -0.328 +/- 0.027 (stat.) +/- 0.045 (syst.) | Beam-helicity asymmetry arising from deeply virtual Compton scattering measured with kinematically complete event reconstruction | beam-helicity asymmetry arising from deeply virtual compton scattering measured with kinematically complete event reconstruction | helicity asymmetry exclusive electroproduction photons longitudinally polarized hera positron unpolarized hermes. asymmetry arises deeply virtual compton interference bethe heitler process. azimuthal amplitudes helicity asymmetry consisting gamma recoiling proton. installation recoil reducing acceptance elimination gamma hermes publications. removal asymmetry stat. syst. | non_dup | [] |
11296559 | 10.1007/JHEP10(2012)047 | The antenna subtraction method handles real radiation contributions in higher order corrections to jet observables. The method is based on antenna functions, which encapsulate all unresolved radiation between a pair of hard radiator partons. To apply this method to compute hadron collider observables, initial-initial antenna functions with both radiators in the initial state are required in unintegrated and integrated forms. In view of extending the antenna subtraction method to next-to-next-to-leading order (NNLO) calculations at hadron colliders, we derive the full set of initial-initial double real radiation antenna functions in integrated form | Antenna subtraction at NNLO with hadronic initial states: double real initial-initial configurations | antenna subtraction at nnlo with hadronic initial states: double real initial-initial configurations | antenna subtraction handles observables. antenna encapsulate unresolved radiator partons. hadron collider observables antenna radiators unintegrated forms. extending antenna subtraction nnlo hadron colliders derive antenna | non_dup | [] |
6207175 | 10.1007/JHEP10(2012)055 | We investigate in which sense, at the linearized level, one can extend the 3D
topologically massive gravity theory beyond three dimensions. We show that, for
each k=1,2,3... a free topologically massive gauge theory in 4k-1 dimensions
can be defined describing a massive "spin-2" particle provided one uses a
non-standard representation of the massive "spin-2" state which makes use of a
two-column Young tableau where each column is of height 2k-1. We work out the
case of k=2, i.e. 7D, and show, by canonical analysis, that the model
describes, unitarily, 35 massive "spin-2" degrees of freedom. The issue of
interactions is discussed and compared with the three-dimensional situation.Comment: 14 pages. v2: minor changes - published versio | On Topologically Massive Spin-2 Gauge Theories beyond Three Dimensions | on topologically massive spin-2 gauge theories beyond three dimensions | linearized extend topologically massive dimensions. topologically massive describing massive massive tableau i.e. canonical describes unitarily massive freedom. pages. minor versio | non_dup | [] |
2256292 | 10.1007/JHEP10(2012)056 | We add massive fundamental matter to the ABJM model by adding D6-branes
wrapped asymptotically over RP3. We find two types of solutions at finite
temperature, one that enters the black hole and one that ends before the black
hole. We analyze the behavior of the free energy as a function of temperature,
and find that the system exhibits a phase transition between the two types of
solutions, similar to what happens in the D3-D7 system. We also analyze the
meson spectrum in the model and find several massive scalar modes, again, quite
like the D3-D7 system. We end with a calculation of the conductivities in the
two phases.Comment: 26 pages, 6 figures; version published in JHE | Embedding massive flavor in ABJM | embedding massive flavor in abjm | massive abjm adding branes wrapped asymptotically enters ends hole. analyze exhibits happens system. analyze meson massive system. conductivities pages | non_dup | [] |
5240492 | 10.1007/JHEP10(2012)057 | We study the matrix model for N M2-branes wrapping a Lens space L(p,1) =
S^3/Z_p. This arises from localization of the partition function of the ABJM
theory, and has some novel features compared with the case of a three-sphere,
including a sum over flat connections and a potential that depends
non-trivially on p. We study the matrix model both numerically and analytically
in the large N limit, finding that a certain family of p flat connections give
an equal dominant contribution. At large N we find the same eigenvalue
distribution for all p, and show that the free energy is simply 1/p times the
free energy on a three-sphere, in agreement with gravity dual expectations.Comment: 28 pages, 4 figure | The large N limit of M2-branes on Lens spaces | the large n limit of m2-branes on lens spaces | branes wrapping lens arises localization partition abjm sphere connections trivially numerically analytically connections contribution. eigenvalue sphere pages | non_dup | [] |
71037575 | 10.1007/JHEP10(2012)063 | In the aligned two-Higgs-doublet model, the alignment of Yukawa matrices in flavour space guarantees the absence of tree-level flavour-changing neutral currents, while allowing at the same time for new sources of CP violation, implying potentially large effects in many low-energy processes. In this work we study the constraints from exclusive radiative $B\to V\gamma$ decays, where $V$ denotes a light vector meson. The current experimental data on the CP-averaged branching ratios and the direct CP and isospin asymmetries are analyzed. It is found that, while the branching ratios and direct CP asymmetries do not constrain the parameter space much further compared to the inclusive $B\to X_{s,d} \gamma$ decays, complementary constraints can be obtained from the isospin asymmetries $\Delta(K^*\gamma)$ and $\Delta(\rho\gamma)$. In addition, correlations between the various observables in exclusive $B\to V\gamma$ and inclusive $B\to X_{s,d} \gamma$ decays are investigated in detail, and predictions are made for several so far unmeasured observables | Exclusive radiative B-meson decays within the aligned two-Higgs-doublet model | exclusive radiative b-meson decays within the aligned two-higgs-doublet model | aligned doublet alignment yukawa flavour guarantees flavour changing neutral currents allowing violation implying potentially processes. exclusive radiative gamma decays meson. averaged branching isospin asymmetries analyzed. branching asymmetries constrain inclusive gamma decays complementary isospin asymmetries delta gamma delta gamma observables exclusive gamma inclusive gamma decays unmeasured observables | non_dup | [] |
6206826 | 10.1007/JHEP10(2012)064 | The purpose of this paper is to formulate the Dirac-Born-Infeld (DBI) action
in a framework of generalized geometry and clarify its symmetry. A D-brane is
defined as a Dirac structure where scalar fields and gauge field are treated on
an equal footing in a static gauge. We derive generalized Lie derivatives
corresponding to the diffeomorphism and B-field gauge transformations and show
that the DBI action is invariant under non-linearly realized symmetries for all
types of diffeomorphisms and B-field gauge transformations. Consequently, we
can interpret not only the scalar field but also the gauge field on the D-brane
as the generalized Nambu-Goldstone boson.Comment: 32 pages, 4 figures, ver2:typos corrected, references adde | D-branes in Generalized Geometry and Dirac-Born-Infeld Action | d-branes in generalized geometry and dirac-born-infeld action | formulate dirac born infeld clarify symmetry. brane dirac footing gauge. derive derivatives diffeomorphism transformations linearly realized symmetries diffeomorphisms transformations. interpret brane nambu goldstone pages typos corrected adde | non_dup | [] |
5252212 | 10.1007/JHEP10(2012)066 | Motivated by the couplings of the dilaton in four-dimensional effective
actions, we investigate the cosmological consequences of a scalar field coupled
both to matter and a Maxwell-type vector field. The vector field has a
background isotropy-violating component. New anisotropic scaling solutions
which can be responsible for the matter and dark energy dominated epochs are
identified and explored. For a large parameter region the universe expands
almost isotropically. Using that the CMB quadrupole is extremely sensitive to
shear, we constrain the ratio of the matter coupling to the vector coupling to
be less than 10^(-5). Moreover, we identify a large parameter region,
corresponding to a strong vector coupling regime, yielding exciting and viable
cosmologies close to the LCDM limit.Comment: Refs. added, some clarifications. Published in JHEP10(2012)06 | Cosmology of a Scalar Field Coupled to Matter and an Isotropy-Violating
Maxwell Field | cosmology of a scalar field coupled to matter and an isotropy-violating maxwell field | motivated couplings dilaton cosmological consequences maxwell field. isotropy violating component. anisotropic dominated epochs explored. universe expands isotropically. quadrupole extremely constrain yielding exciting viable cosmologies lcdm refs. clarifications. jhep | non_dup | [] |
6206629 | 10.1007/JHEP10(2012)071 | We study the impact of the multi-lepton searches at the LHC on supersymmetric
models with compressed mass spectra. For such models the acceptances of the
usual search strategies are significantly reduced due to requirement of large
effective mass and missing E_T. On the other hand, lepton searches do have much
lower thresholds for missing E_T and p_T of the final state objects. Therefore,
if a model with a compressed mass spectrum allows for multi-lepton final
states, one could derive constraints using multi-lepton searches. For a class
of simplified models we study the exclusion limits using ATLAS multi-lepton
search analyses for the final states containing 2-4 electrons or muons with a
total integrated luminosity of 1-2/fb at \sqrt{s}=7 TeV. We also modify those
analyses by imposing additional cuts, so that their sensitivity to compressed
supersymmetric models increase. Using the original and modified analyses, we
show that the exclusion limits can be competitive with jet plus missing E_T
searches, providing exclusion limits up to gluino masses of 1 TeV. We also
analyse the efficiencies for several classes of events coming from different
intermediate state particles. This allows us to assess exclusion limits in
similar class of models with different cross sections and branching ratios
without requiring a Monte Carlo simulation.Comment: 18 pages, 5 figure | Constraining compressed supersymmetry using leptonic signatures | constraining compressed supersymmetry using leptonic signatures | lepton searches supersymmetric compressed spectra. acceptances usual requirement missing lepton searches thresholds missing objects. compressed lepton derive lepton searches. simplified exclusion atlas lepton muons luminosity sqrt tev. modify imposing cuts compressed supersymmetric increase. exclusion competitive missing searches exclusion gluino tev. analyse efficiencies coming particles. exclusion branching requiring monte carlo pages | non_dup | [] |
6207169 | 10.1007/JHEP10(2012)074 | We argue that the natural functions for describing the multi-Regge limit of
six-gluon scattering in planar N=4 super Yang-Mills theory are the
single-valued harmonic polylogarithmic functions introduced by Brown. These
functions depend on a single complex variable and its conjugate, (w,w*). Using
these functions, and formulas due to Fadin, Lipatov and Prygarin, we determine
the six-gluon MHV remainder function in the leading-logarithmic approximation
(LLA) in this limit through ten loops, and the next-to-LLA (NLLA) terms through
nine loops. In separate work, we have determined the symbol of the four-loop
remainder function for general kinematics, up to 113 constants. Taking its
multi-Regge limit and matching to our four-loop LLA and NLLA results, we fix
all but one of the constants that survive in this limit. The multi-Regge limit
factorizes in the variables (\nu,n) which are related to (w,w*) by a
Fourier-Mellin transform. We can transform the single-valued harmonic
polylogarithms to functions of (\nu,n) that incorporate harmonic sums,
systematically through transcendental weight six. Combining this information
with the four-loop results, we determine the eigenvalues of the BFKL kernel in
the adjoint representation to NNLLA accuracy, and the MHV product of impact
factors to NNNLLA accuracy, up to constants representing beyond-the-symbol
terms and the one symbol-level constant. Remarkably, only derivatives of the
polygamma function enter these results. Finally, the LLA approximation to the
six-gluon NMHV amplitude is evaluated through ten loops.Comment: 71 pages, 2 figures, plus 10 ancillary files containing analytic
expressions in Mathematica format. V2: Typos corrected and references added.
V3: Typos corrected; assumption about single-Reggeon exchange made explici | Single-valued harmonic polylogarithms and the multi-Regge limit | single-valued harmonic polylogarithms and the multi-regge limit | argue describing regge gluon planar super mills valued harmonic polylogarithmic brown. conjugate formulas fadin lipatov prygarin gluon remainder logarithmic loops nlla nine loops. symbol remainder kinematics constants. regge matching nlla survive limit. regge factorizes fourier mellin transform. transform valued harmonic polylogarithms incorporate harmonic sums systematically transcendental six. combining eigenvalues bfkl kernel adjoint nnlla nnnlla representing symbol symbol constant. remarkably derivatives polygamma enter results. gluon nmhv pages ancillary files analytic expressions mathematica format. typos corrected added. typos corrected reggeon explici | non_dup | [] |
5253053 | 10.1007/JHEP10(2012)076 | The investigation of the q deformation of the S-matrix for excitations on the
string world sheet in AdS5 x S5 is continued. We argue that due to the lack of
Lorentz invariance the situation is more subtle than in a relativistic theory
in that the nature of bound states depends on their momentum. At low enough
momentum |p|<E the bound states transform in the anti-symmetric representation
of the super-algebra symmetry and become the solitons of the Pohlmeyer reduced
theory in the relativistic limit. At a critical momentum |p|=E they become
marginally unstable, and at higher momenta the stable bound states are in the
symmetric representation and become the familiar magnons in the string limit as
q->1. This subtlety fixes a problem involving the consistency of crossing
symmetry with the relativistic limit found in earlier work. With mirror
kinematics, obtained after a double Wick rotation, the bound state structure is
simpler and there are no marginally unstable bound states.Comment: 25 page | Bound States of the q-Deformed AdS5 x S5 Superstring S-matrix | bound states of the q-deformed ads5 x s5 superstring s-matrix | deformation excitations sheet continued. argue lorentz invariance subtle relativistic momentum. transform super solitons pohlmeyer relativistic limit. marginally unstable momenta familiar magnons subtlety fixes involving consistency crossing relativistic work. mirror kinematics wick simpler marginally unstable | non_dup | [] |
84457055 | 10.1007/JHEP10(2012)078 | Anti-D-branes inserted in warped throat geometries (supported by fluxes that carry D-brane charges) develop unphysical singularities.It has been argued that these singularities could be resolved when one goes beyond the linearized approximation or includes the effects of brane polarization.In this paper we consider anti-D6 branes, whose singularities have been shown to exist at the full non-linear level, and demonstrate that there is no D8 brane polarization that can resolve the singularity. We comment on the potential implications of this result for the resolution of anti-D3 brane singularities in the Klebanov-Strassler geometry.ANR/08-JCJC-0001-0ERC/String-QCD-BHDFG/EXC/QUESTERC/ObservableStringDFG/WR 166/1-1Alfred P. Sloan FoundationNSF/PHY-075786 | Persistent anti-brane singularities | persistent anti-brane singularities | branes inserted warped throat geometries fluxes carry brane charges unphysical argued singularities resolved goes linearized brane polarization.in branes singularities brane resolve singularity. comment brane singularities klebanov strassler geometry.anr jcjc bhdfg questerc observablestringdfg alfred sloan foundationnsf | non_dup | [] |
56653455 | 10.1007/JHEP10(2012)080 | The decomposition of the nucleon spin into that of quarks and gluons is related to twist-two GPDs according to Ji sum rule. Further decomposition into the helicity and the orbital angular momentum inevitably requires twist-three GPDs. In this paper we derive exact relations between twist-three GPDs and the canonical orbital angular momentum density of quarks and gluons, and check their consistency with the longitudinal spin sum rule. Our work demonstrates that the complete decomposition of the nucleon spin fits well with the framework of perturbative QCD | Twist analysis of the nucleon spin in QCD | twist analysis of the nucleon spin in qcd | decomposition nucleon quarks gluons twist gpds rule. decomposition helicity orbital inevitably twist gpds. derive twist gpds canonical orbital quarks gluons check consistency longitudinal rule. demonstrates decomposition nucleon fits perturbative | non_dup | [] |
5255314 | 10.1007/JHEP10(2012)085 | We study the energy loss of a rotating infinitely massive quark moving, at
constant velocity, through an anisotropic strongly-coupled N=4 plasma from
holography. It is shown that, similar to the isotropic plasma, the energy loss
of the rotating quark is due to either the drag force or radiation with a
continuous crossover from drag-dominated regime to the radiation dominated
regime. We find that the anisotropy has a significant effect on the energy loss
of the heavy quark, specially in the crossover regime. We argue that the energy
loss due to radiation in anisotropic media is less than the isotropic case.
Interestingly this is similar to analogous calculations for the energy loss in
weakly coupled anisotropic plasma.Comment: 26+1 pages, 10 figures, typos fixe | Energy loss in a strongly coupled anisotropic plasma | energy loss in a strongly coupled anisotropic plasma | rotating infinitely massive moving anisotropic holography. isotropic rotating drag crossover drag dominated dominated regime. anisotropy specially crossover regime. argue anisotropic isotropic case. interestingly analogous weakly anisotropic pages typos fixe | non_dup | [] |
71039469 | 10.1007/JHEP10(2012)086 | We show that for recently discovered large values of theta(13), a superbeam with an average neutrino energy of ~ 5 GeV, such as those being proposed at CERN, if pointing to Super-Kamiokande (L = 8770 km), could reveal the neutrino mass hierarchy at 5 sigma in less than two years irrespective of the true hierarchy and CP phase. The measurement relies on the near resonant matter effect in the numu to nue oscillation channel, and can be done counting the total number of appearance events with just a neutrino beam | Probing the neutrino mass hierarchy with Super-Kamiokande | probing the neutrino mass hierarchy with super-kamiokande | discovered theta superbeam cern pointing super kamiokande reveal hierarchy sigma irrespective hierarchy phase. relies resonant numu oscillation counting appearance | non_dup | [] |
5238104 | 10.1007/JHEP10(2012)092 | The asymptotic group of symmetries at null infinity of flat spacetimes in
three and four dimensions is the infinite dimensional Bondi-Metzner-Sachs (BMS)
group. This has recently been shown to be isomorphic to non-relativistic
conformal algebras in one lower dimension, the Galilean Conformal Algebra (GCA)
in 2d and a closely related non-relativistic algebra in 3d [1]. We provide a
better understanding of this surprising connection by providing a spacetime
interpretation in terms of a novel contraction. The 2d GCA, obtained from a
linear combination of two copies of the Virasoro algebra, is generically
non-unitary. The unitary subsector previously constructed had trivial
correlation functions. We consider a representation obtained from a different
linear combination of the Virasoros, which is relevant to the relation with the
BMS algebra in three dimensions. This is realised by a new space-time
contraction of the parent algebra. We show that this representation has a
unitary sub-sector with interesting correlation functions. We discuss
implications for the BMS/GCA correspondence and show that the flat space limit
actually induces precisely this contraction on the boundary conformal field
theory. We also discuss aspects of asymptotic symmetries and the consequences
of this contraction in higher dimensions.Comment: 26 pages, 1 figure, 1 table; v2: Minor correction | BMS/GCA Redux: Towards Flatspace Holography from Non-Relativistic
Symmetries | bms/gca redux: towards flatspace holography from non-relativistic symmetries | asymptotic symmetries infinity spacetimes infinite bondi metzner sachs group. isomorphic relativistic conformal algebras galilean conformal closely relativistic surprising connection spacetime contraction. copies virasoro generically unitary. unitary subsector trivial functions. virasoros dimensions. realised contraction parent algebra. unitary functions. correspondence induces precisely contraction conformal theory. asymptotic symmetries consequences contraction pages minor | non_dup | [] |
6207804 | 10.1007/JHEP10(2012)094 | For D=4 BPS state construction, counting, and wall-crossing thereof, quiver
quantum mechanics offers two alternative approaches, the Coulomb phase and the
Higgs phase, which sometimes produce inequivalent counting. The authors have
proposed, in arXiv:1205.6511, two conjectures on the precise relationship
between the two, with some supporting evidences. Higgs phase ground states are
naturally divided into the Intrinsic Higgs sector, which is insensitive to
wall-crossings and thus an invariant of quiver, plus a pulled-back ambient
cohomology, conjectured to be an one-to-one image of Coulomb phase ground
states. In this note, we show that these conjectures hold for all cyclic
quivers with Abelian nodes, and further explore angular momentum and R-charge
content of individual states. Along the way, we clarify how the protected spin
character of BPS states should be computed in the Higgs phase, and further
determine the entire Hodge structure of the Higgs phase cohomology. This shows
that, while the Coulomb phase states are classified by angular momentum, the
Intrinsic Higgs states are classified by R-symmetry.Comment: 51 pages, 5 figure | BPS States, Refined Indices, and Quiver Invariants | bps states, refined indices, and quiver invariants | counting crossing thereof quiver mechanics offers coulomb sometimes inequivalent counting. conjectures precise supporting evidences. naturally divided intrinsic insensitive crossings quiver pulled ambient cohomology conjectured coulomb states. conjectures hold cyclic quivers abelian explore states. clarify protected character hodge cohomology. coulomb classified intrinsic classified pages | non_dup | [] |
9260790 | 10.1007/JHEP10(2012)095 | The thermodynamics of three-dimensional asymptotically flat cosmological
solutions that play the same role than the BTZ black holes in the anti-de
Sitter case is derived and explained from holographic properties of flat space.
It is shown to coincide with the flat-space limit of the thermodynamics of the
inner black hole horizon on the one hand and the semi-classical approximation
to the gravitational partition function associated to the entropy of the outer
horizon on the other. This leads to the insight that it is the Massieu function
that is universal in the sense that it can be computed at either horizon.Comment: 16 pages Latex file, v2: references added, cosmetic changes, v3: 1
reference adde | Entropy of three-dimensional asymptotically flat cosmological solutions | entropy of three-dimensional asymptotically flat cosmological solutions | thermodynamics asymptotically cosmological holes sitter holographic space. coincide thermodynamics horizon gravitational partition outer horizon other. insight massieu universal pages latex file cosmetic adde | non_dup | [] |
9259356 | 10.1007/JHEP10(2012)098 | We study holographic entanglement entropy in the background of charged
dilatonic black holes which can be viewed as holographic duals of certain
finite density states of N=4 super Yang-Mills. These charged black holes are
distinguished in that they have vanishing ground state entropy. The
entanglement entropy for a slab experiences a second order phase transition as
the thickness of the slab is varied, while the entanglement entropy for a
sphere is a smooth function of the radius. This suggests that the second scale
introduced by the anisotropy of the slab plays an important role in driving the
phase transition. In both cases we do not observe any logarithmic violation of
the area law indicative of hidden Fermi surfaces. We investigate how these
results are affected by the inclusion of the Gauss-Bonnet term in the bulk
gravitational action. We also observe that such addition to the bulk action
does not change the logarithmic violation of the area law in the backgrounds
with hyperscaling violation.Comment: harvmac, 26 pages, 9 figures; v2: minor correction | On Holographic Entanglement Entropy of Charged Matter | on holographic entanglement entropy of charged matter | holographic entanglement dilatonic holes viewed holographic duals super mills. holes distinguished vanishing entropy. entanglement slab experiences slab varied entanglement sphere radius. anisotropy slab plays driving transition. logarithmic violation indicative hidden fermi surfaces. inclusion gauss bonnet gravitational action. logarithmic violation backgrounds hyperscaling harvmac pages minor | non_dup | [] |
6207798 | 10.1007/JHEP10(2012)100 | We compute the effective Kahler potential for matter fields in warped
compactifications, starting from five dimensional gauged supergravity, as a
function of the matter fields localization. We show that truncation to zero
modes is inconsistent and the tree-level exchange of the massive gravitational
multiplet is needed for consistency of the four-dimensional theory. In addition
to the standard Kahler coming from dimensional reduction, we find the quartic
correction coming from integrating out the gravity multiplet. We apply our
result to the computation of scalar masses, by assuming that the SUSY breaking
field is a bulk hypermultiplet. In the limit of extreme opposite localization
of the matter and the spurion fields, we find zero scalar masses, consistent
with sequestering arguments. Surprisingly enough, for all the other cases the
scalar masses are tachyonic. This suggests the holographic interpretation that
a CFT sector always generates operators contributing in a tachyonic way to
scalar masses. Viability of warped su- persymmetric compactifications
necessarily asks then for additional contributions. We discuss the case of
additional bulk vector multiplets with mixed boundary conditions, which is a
partic- ularly simple and attractive way to generate large positive scalar
masses. We show that in this case successful fermion mass matrices implies
highly degenerate scalar masses for the first two generations of squarks and
sleptons.Comment: 23 pages. v2: References added, new section on effect of additional
bulk vector multiplets and phenomenolog | Universal contributions to scalar masses from five dimensional
supergravity | universal contributions to scalar masses from five dimensional supergravity | kahler warped compactifications gauged supergravity localization. truncation inconsistent massive gravitational multiplet consistency theory. kahler coming quartic coming integrating multiplet. susy breaking hypermultiplet. extreme opposite localization spurion sequestering arguments. surprisingly tachyonic. holographic generates contributing tachyonic masses. viability warped persymmetric compactifications necessarily asks contributions. multiplets partic ularly attractive masses. successful fermion degenerate generations squarks pages. multiplets phenomenolog | non_dup | [] |
71038344 | 10.1007/JHEP10(2012)102 | Next to leading order corrections to the SU(3) × SU(3) Gell-Mann-Oakes-Renner relation (GMOR) are obtained using weighted QCD Finite Energy Sum Rules (FESR) involving the pseudoscalar current correlator. Two types of integration kernels in the FESR are used to suppress the contribution of the kaon radial excitations to the hadronic spectral function, one with local and the other with global constraints. The result for the pseudoscalar current correlator at zero momentum is psi 5(0) = (2.8 ± 0.3) ×10-3 GeV4, leading to the chiral corrections to GMOR: delta K = (55 ± 5)%. The resulting uncertainties are mostly due to variations in the upper limit of integration in the FESR, within the stability regions, and to a much lesser extent due to the uncertainties in the strong coupling and the strange quark mass. Higher order quark mass corrections, vacuum condensates, and the hadronic resonance sector play a negligible role in this determination. These results confirm an independent determination from chiral perturbation theory giving also very large corrections, i.e. roughly an order of magnitude larger than the corresponding corrections in chiral SU(2) × SU(2). Combining these results with our previous determination of the corrections to GMOR in chiral SU(2) × SU(2), delta pi , we are able to determine two low energy constants of chiral perturbation theory, i.e. L_8^r=( {1.0± 0.3} )× {10^{-3 }} , and H_2^r=-( {4.7± 0.6} )× {10^{-3 }} , both atthe scaleof the rho-meson mass | Corrections to the SU(3 x SU(3) Gell-Mann-Oakes-Renner relation and chiral couplings Lr8 and Hr2 | corrections to the su(3 x su(3) gell-mann-oakes-renner relation and chiral couplings lr8 and hr2 | gell mann oakes renner gmor weighted fesr involving pseudoscalar correlator. kernels fesr suppress kaon excitations hadronic constraints. pseudoscalar correlator chiral gmor delta mostly fesr lesser strange mass. condensates hadronic negligible determination. confirm chiral perturbation giving i.e. roughly chiral combining gmor chiral delta chiral perturbation i.e. atthe scaleof meson | non_dup | [] |
5242304 | 10.1007/JHEP10(2012)105 | We explore some aspects of 4D supergravity theories and F-theory vacua that
are parallel to structures in the space of 6D theories. The spectrum and
topological terms in 4D supergravity theories correspond to topological data of
F-theory geometry, just as in six dimensions. In particular, topological
axion-curvature squared couplings appear in 4D theories; these couplings are
characterized by vectors in the dual to the lattice of axion shift symmetries
associated with string charges. These terms are analogous to the Green-Schwarz
terms of 6D supergravity theories, though in 4D the terms are not generally
linked with anomalies. We outline the correspondence between F-theory topology
and data of the corresponding 4D supergravity theories. The correspondence of
geometry with structure in the low-energy action illuminates topological
aspects of heterotic-F-theory duality in 4D as well as in 6D. The existence of
an F-theory realization also places geometrical constraints on the 4D
supergravity theory in the large-volume limit.Comment: 63 page | Structure in 6D and 4D N=1 supergravity theories from F-theory | structure in 6d and 4d n=1 supergravity theories from f-theory | explore supergravity vacua theories. topological supergravity topological dimensions. topological axion curvature squared couplings couplings axion symmetries charges. analogous schwarz supergravity anomalies. outline correspondence topology supergravity theories. correspondence illuminates topological heterotic duality realization places geometrical supergravity | non_dup | [] |
9325710 | 10.1007/JHEP10(2012)107 | We study the behaviors of entanglement entropy and vacuum expectation value
of Wilson loop in the St\"{u}ckelberg holographic insulator/superconductor
model. This model has rich phase structures depending on model parameters. Both
the entanglement entropy for a strip geometry and the heavy quark potential
from the Wilson loop show that there exists a "confinement/deconfinement" phase
transition. In addition, we find that the non-monotonic behavior of the
entanglement entropy with respect to chemical potential is universal in this
model. The pseudo potential from the spatial Wilson loop also has a similar
non-monotonic behavior. It turns out that the entanglement entropy and Wilson
loop are good probes to study the properties of the holographic superconductor
phase transition.Comment: 23 pages,12 figures. v2: typos corrected, accepted in JHE | Entanglement Entropy and Wilson Loop in St\"{u}ckelberg Holographic
Insulator/Superconductor Model | entanglement entropy and wilson loop in st\"{u}ckelberg holographic insulator/superconductor model | behaviors entanglement expectation wilson ckelberg holographic insulator superconductor model. parameters. entanglement strip wilson confinement deconfinement transition. monotonic entanglement universal model. pseudo wilson monotonic behavior. turns entanglement wilson probes holographic superconductor pages figures. typos corrected | non_dup | [] |
9324165 | 10.1007/JHEP10(2012)108 | The conventional S-matrix approach to the (tree level) open string low energy
effective lagrangian assumes that, in order to obtain all its bosonic
${\alpha'}^N$ order terms, it is necessary to know the open string (tree level)
$(N+2)$-point amplitude of massless bosons, at least expanded at that order in
$\alpha'$. In this work we clarify that the previous claim is indeed valid for
the bosonic open string, but for the supersymmetric one the situation is much
more better than that: there are constraints in the kinematical bosonic terms
of the amplitude (probably due to Spacetime Supersymmetry) such that a much
lower open superstring $n$-point amplitude is needed to find all the
${\alpha'}^N$ order terms. In this `revisited' S-matrix approach we have
checked that, at least up to ${\alpha'}^4$ order, using these kinematical
constraints and only the known open superstring 4-point amplitude, it is
possible to determine all the bosonic terms of the low energy effective
lagrangian. The sort of results that we obtain seem to agree completely with
the ones achieved by the method of BPS configurations, proposed about ten years
ago. By means of the KLT relations, our results can be mapped to the NS-NS
sector of the low energy effective lagrangian of the type II string theories
implying that there one can also find kinematical constraints in the $N$-point
amplitudes and that important informations can be inferred, at least up to
${\alpha'}^4$ order, by only using the (tree level) 4-point amplitude.Comment: 34 pages, 3 figure, Submitted on Aug 4, 2012, Published on Oct 15,
201 | Revisiting the S-matrix approach to the open superstring low energy
effective lagrangian | revisiting the s-matrix approach to the open superstring low energy effective lagrangian | lagrangian assumes bosonic alpha massless bosons expanded alpha clarify claim valid bosonic supersymmetric kinematical bosonic probably spacetime supersymmetry superstring alpha terms. revisited checked alpha kinematical superstring bosonic lagrangian. sort seem agree configurations ago. mapped lagrangian implying kinematical amplitudes informations inferred alpha pages submitted | non_dup | [] |
11296698 | 10.1007/JHEP10(2012)110 | We present details of a calculation of the cross section for hadronic top-antitop production in next-to-leading order (NLO) QCD, including the decays of the top and antitop into bottom quarks and leptons. This calculation is based on matrix elements for ν e e+ μ - {{overline{ν}}_{μ }}boverline{b} production and includes all non-resonant diagrams, interferences, and off-shell effects of the top quarks. Such contributions are formally suppressed by the top-quark width and turn out to be small in the inclusive cross section. However, they can be strongly enhanced in exclusive observables that play an important role in Higgs and new-physics searches. Also non-resonant and off-shell effects due to the finite W-boson width are investigated in detail, but their impact is much smaller than naively expected. We also introduce a matching approach to improve NLO calculations involving intermediate unstable particles. Using a fixed QCD scale leads to perturbative instabilities in the high-energy tails of distributions, but an appropriate dynamical scale stabilises NLO predictions. Numerical results for the total cross section, several distributions, and asymmetries are presented for Tevatron and the LHC at 7 TeV, 8 TeV, and 14 TeV | NLO QCD corrections to off-shell top-antitop production with leptonic decays at hadron colliders | nlo qcd corrections to off-shell top-antitop production with leptonic decays at hadron colliders | hadronic antitop decays antitop quarks leptons. overline boverline resonant diagrams interferences quarks. formally suppressed inclusive section. exclusive observables searches. resonant boson naively expected. matching involving unstable particles. perturbative instabilities tails stabilises predictions. asymmetries tevatron | non_dup | [] |
6207443 | 10.1007/JHEP10(2012)116 | We reconsider string and domain wall central charges in N=2 supersymmetric
gauge theories in four dimensions in presence of the Omega background in the
Nekrasov-Shatashvili (NS) limit. Existence of these charges entails presence of
the corresponding topological defects in the theory - vortices and domain
walls. In spirit of the 4d/2d duality we discuss the worldsheet low energy
effective theory living on the BPS vortex in N=2 Supersymmetric Quantum
Chromodynamics (SQCD). We discuss some aspects of the brane realization of the
dualities between various quantum integrable models. A chain of such dualities
enables us to check the AGT correspondence in the NS limit.Comment: 48 pages, 10 figures, minor changes, references added, typos
correcte | BPS States in Omega Background and Integrability | bps states in omega background and integrability | reconsider charges supersymmetric omega nekrasov shatashvili limit. charges entails topological defects vortices walls. spirit duality worldsheet living vortex supersymmetric chromodynamics sqcd brane realization dualities integrable models. dualities enables check correspondence pages minor typos correcte | non_dup | [] |
6206668 | 10.1007/JHEP10(2012)122 | The Next-to-Minimal Supersymmetric Extension of the Standard Model (NMSSM)
with a Higgs sector containing five neutral and two charged Higgs bosons allows
for a rich phenomenology. In addition, the plethora of parameters provides many
sources of CP violation. In contrast to the Minimal Supersymmetric Extension,
CP violation in the Higgs sector is already possible at tree-level. For a
reliable understanding and interpretation of the experimental results of the
Higgs boson search, and for a proper distinction of Higgs sectors provided by
the Standard Model or possible extensions, the Higgs boson masses have to be
known as precisely as possible including higher-order corrections. In this
paper we calculate the one-loop corrections to the neutral Higgs boson masses
in the complex NMSSM in a Feynman diagrammatic approach adopting a mixed
renormalization scheme based on on-shell and $\bar{DR}$ conditions. We study
various scenarios where we allow for tree-level CP-violating phases in the
Higgs sector and where we also study radiatively induced CP violation due to a
non-vanishing phase of the trilinear coupling $A_t$ in the stop sector. The
effects on the Higgs boson phenomenology are found to be significant. We
furthermore estimate the theoretical error due to unknown higher-order
corrections by both varying the renormalization scheme of the top and bottom
quark masses and by adopting different renormalization scales. The residual
theoretical error can be estimated to about 10% | Higgs Boson Masses in the Complex NMSSM at One-Loop Level | higgs boson masses in the complex nmssm at one-loop level | supersymmetric nmssm neutral bosons phenomenology. plethora violation. supersymmetric violation level. reliable boson proper distinction sectors extensions boson precisely corrections. neutral boson nmssm feynman diagrammatic adopting renormalization conditions. scenarios violating radiatively violation vanishing trilinear stop sector. boson phenomenology significant. unknown renormalization adopting renormalization scales. residual | non_dup | [] |
9325603 | 10.1007/JHEP10(2012)124 | We study the possibility of achieving metastable de Sitter vacua in general
N=2 to N=1 truncated supergravities without vector multiplets, and compare with
the situations arising in N=2 theories with only hypermultiplets and N=1
theories with only chiral multiplets. In N=2 theories based on a quaternionic
manifold and a graviphoton gauging, de Sitter vacua are necessarily unstable,
as a result of the peculiar properties of the geometry. In N=1 theories based
on a Kahler manifold and a superpotential, de Sitter vacua can instead be
metastable provided the geometry satisfies some constraint and the
superpotential can be freely adjusted. In N=2 to N=1 truncations, the crucial
requirement is then that the tachyon of the mother theory be projected out from
the daughter theory, so that the original unstable vacuum is projected to a
metastable vacuum. We study the circumstances under which this may happen and
derive general constraints for metastability on the geometry and the gauging.
We then study in full detail the simplest case of quaternionic manifolds of
dimension four with at least one isometry, for which there exists a general
parametrization, and study two types of truncations defining Kahler
submanifolds of dimension two. As an application, we finally discuss the case
of the universal hypermultiplet of N=2 superstrings and its truncations to the
dilaton chiral multiplet of N=1 superstrings. We argue that de Sitter vacua in
such theories are necessarily unstable in weakly coupled situations, while they
can in principle be metastable in strongly coupled regimes.Comment: 40 pages, no figure | Metastable de Sitter vacua in N=2 to N=1 truncated supergravity | metastable de sitter vacua in n=2 to n=1 truncated supergravity | achieving metastable sitter vacua truncated supergravities multiplets situations arising hypermultiplets chiral multiplets. quaternionic manifold graviphoton gauging sitter vacua necessarily unstable peculiar geometry. kahler manifold superpotential sitter vacua metastable satisfies superpotential freely adjusted. truncations crucial requirement tachyon mother projected daughter unstable projected metastable vacuum. circumstances happen derive metastability gauging. simplest quaternionic manifolds isometry parametrization truncations defining kahler submanifolds two. universal hypermultiplet superstrings truncations dilaton chiral multiplet superstrings. argue sitter vacua necessarily unstable weakly situations metastable pages | non_dup | [] |
8781420 | 10.1007/JHEP10(2012)126 | The mass distribution of jets produced in hard processes at the LHC plays an
important role in several jet substructure related studies involving both
Standard Model and BSM physics, especially in the context of boosted heavy
particle searches. We compute analytically the jet-mass distribution for both
Z+jet and dijet processes, for QCD jets defined in the anti-k_t algorithm with
an arbitrary radius R, to next-to-leading logarithmic accuracy and match our
resummed calculation to full leading-order results. We note the important role
played by initial state radiation (ISR) and non-global logarithms explicitly
computed here for the first time for hadron collider observables, as well as
the jet radius dependence of these effects. We also compare our results to
standard Monte Carlo event generators and discuss directions for further
studies and phenomenology.Comment: 39 pages, 7 figures. We rectify our statement about finite R
corrections to non-global logarithms in Eq. 4.5 and Appendix B.1. The
corrections we find have negligible impact on the numeric | On jet mass distributions in Z+jet and dijet processes at the LHC | on jet mass distributions in z+jet and dijet processes at the lhc | jets plays substructure involving boosted searches. analytically dijet jets logarithmic match resummed results. played logarithms explicitly hadron collider observables effects. monte carlo generators directions pages figures. rectify statement logarithms negligible numeric | non_dup | [] |
9259114 | 10.1007/JHEP10(2012)128 | The Mordell-Weil group of an elliptically fibered Calabi-Yau threefold X
contains information about the abelian sector of the six-dimensional theory
obtained by compactifying F-theory on X. After examining features of the
abelian anomaly coefficient matrix and U(1) charge quantization conditions of
general F-theory vacua, we study Calabi-Yau threefolds with Mordell-Weil
rank-one as a first step towards understanding the features of the Mordell-Weil
group of threefolds in more detail. In particular, we generate an interesting
class of F-theory models with U(1) gauge symmetry that have matter with both
charges 1 and 2. The anomaly equations --- which relate the Neron-Tate height
of a section to intersection numbers between the section and fibral rational
curves of the manifold --- serve as an important tool in our analysis.Comment: 29 pages + appendices, 5 figures; v2: minor correction | F-Theory and the Mordell-Weil Group of Elliptically-Fibered Calabi-Yau
Threefolds | f-theory and the mordell-weil group of elliptically-fibered calabi-yau threefolds | mordell weil elliptically fibered calabi threefold abelian compactifying examining abelian anomaly quantization vacua calabi threefolds mordell weil mordell weil threefolds detail. charges anomaly relate neron tate intersection fibral rational manifold serve pages appendices minor | non_dup | [] |
9259372 | 10.1007/JHEP10(2012)130 | We present an implementation for slepton pair production at hadron colliders
in the POWHEG BOX, a framework for combining next-to-leading order QCD
calculations with parton-shower Monte-Carlo programs. Our code provides a SUSY
Les Houches Accord interface for setting the supersymmetric input parameters.
Decays of the sleptons and parton-shower effects are simulated with PYTHIA.
Focussing on a representative point in the supersymmetric parameter space we
show results for kinematic distributions that can be observed experimentally.
While next-to-leading order QCD corrections are sizable for all distributions,
the parton shower affects the color-neutral particles only marginally.
Pronounced parton-shower effects are found for jet distributions.Comment: 10 pages, 4 figure | Slepton pair production in the POWHEG BOX | slepton pair production in the powheg box | slepton hadron colliders powheg combining parton shower monte carlo programs. susy houches accord supersymmetric parameters. decays sleptons parton shower pythia. focussing supersymmetric kinematic experimentally. sizable parton shower affects neutral marginally. pronounced parton shower pages | non_dup | [] |
6207783 | 10.1007/JHEP10(2012)134 | There is evidence for a 130 GeV gamma-ray line at the Galactic Center in the
Fermi Large Area Telescope data. Dark matter candidates that explain this
feature should also annihilate to Standard Model particles, resulting in a
continuous spectrum of photons. To study this continuum, we analyze the Fermi
data down to 5 GeV, restricted to the inner 3 degrees of the Galaxy. We place a
strong bound on the ratio of continuum photons to monochromatic line photons
that is independent of uncertainties in the dark matter density profile. The
derived constraints exclude neutralino dark matter as an explanation for the
line.Comment: 14+10 pages, 11 figures, 3 appendices; v2 refs added, additional
final states included; v3 minor difference in data selection criteria,
conclusions unchanged; v4 journal versio | Illuminating the 130 GeV Gamma Line with Continuum Photons | illuminating the 130 gev gamma line with continuum photons | gamma galactic fermi telescope data. candidates annihilate photons. continuum analyze fermi restricted galaxy. continuum photons monochromatic photons profile. exclude neutralino explanation pages appendices refs minor unchanged versio | non_dup | [] |
5256983 | 10.1007/JHEP10(2012)135 | Starting from the standard supertwistor realizations for conformally
compactified N-extended Minkowski superspaces in three and four space-time
dimensions, we elaborate on alternative realizations in terms of graded
two-forms on the dual supertwistor spaces. The construction is further
generalized to the cases of 4D N=2 and 3D N-extended harmonic/projective
superspaces. We present a superconformal Fourier expansion of tensor
superfields on the 4D N=2 harmonic/projective superspace.Comment: 29 pages; V2: typos corrected, references and comments added; V3:
eqs. (5.11) and (6.10) modified, reference adde | Conformally compactified Minkowski superspaces revisited | conformally compactified minkowski superspaces revisited | supertwistor realizations conformally compactified minkowski superspaces elaborate realizations graded supertwistor spaces. harmonic projective superspaces. superconformal fourier superfields harmonic projective pages typos corrected comments eqs. adde | non_dup | [] |
6207797 | 10.1007/JHEP10(2012)139 | The standard extremal p-brane solutions in supergravity are known to allow
for a generalisation which consists of adding a linear dependence on the
world-volume coordinates to the usual harmonic function. In this note we
demonstrate that remarkably this generalisation goes through in exactly the
same way for p-branes with fluxes added to it that correspond to fractional
p-branes. We relate this to warped orientifold compactifications by trading the
Dp-branes for Op-planes that solve the RR tadpole condition. This allows us to
interpret the worldvolume dependence as due to lower-dimensional scalars that
flow along the massless directions in the no-scale potential. Depending on the
details of the fluxes these flows can be supersymmetric domain wall flows. Our
solutions provide explicit examples of backreacted orientifold planes in
compactifications with non-constant moduli.Comment: 20 pages, incl. references. v2: small changes required for JHEP
publication. v3: few equation typos correcte | Fractional branes, warped compactifications and backreacted orientifold
planes | fractional branes, warped compactifications and backreacted orientifold planes | extremal brane supergravity generalisation adding usual harmonic function. remarkably generalisation goes branes fluxes fractional branes. relate warped orientifold compactifications trading branes planes solve tadpole condition. interpret worldvolume scalars massless directions potential. fluxes flows supersymmetric flows. backreacted orientifold planes compactifications pages incl. references. jhep publication. typos correcte | non_dup | [] |
5239658 | 10.1007/JHEP10(2012)141 | The limit of families of two-dimensional conformal field theories has
recently attracted attention in the context of AdS/CFT dualities. In our work
we analyse the limit of N=(2,2) superconformal minimal models when the central
charge approaches c=3. The limiting theory is a non-rational N=(2,2)
superconformal theory, in which there is a continuum of chiral primary fields.
We determine the spectrum of the theory, the three-point functions on the
sphere, and the disc one-point functions.Comment: 37 pages, 3 figures; v2: minor corrections in section 5.3, version to
be published in JHE | The limit of N=(2,2) superconformal minimal models | the limit of n=(2,2) superconformal minimal models | families conformal attracted dualities. analyse superconformal limiting rational superconformal continuum chiral fields. sphere disc pages minor | non_dup | [] |
5253856 | 10.1007/JHEP10(2012)144 | In this article we compute the action of the two loop dilatation operator on
restricted Schur polynomials that belong to the su(2) sector, in the displaced
corners approximation. In this non-planar large N limit, operators that
diagonalize the one loop dilatation operator are not corrected at two loops.
The resulting spectrum of anomalous dimensions is related to a set of decoupled
harmonic oscillators, indicating integrability in this sector of the theory at
two loops. The anomalous dimensions are a non-trivial function of the 't Hooft
coupling, with a spectrum that is continuous and starting at zero at large N,
but discrete at finite N.Comment: version to appear in JHE | Nonplanar integrability at two loops | nonplanar integrability at two loops | dilatation restricted schur polynomials belong displaced corners approximation. planar diagonalize dilatation corrected loops. anomalous decoupled harmonic oscillators integrability loops. anomalous trivial hooft | non_dup | [] |
5253862 | 10.1007/JHEP10(2012)146 | We study closed string axions in type IIB orientifold compactifications. We
show that for natural values of the background fluxes the moduli stabilisation
mechanism of the LARGE Volume Scenario (LVS) gives rise to an axiverse
characterised by the presence of a QCD axion plus many light axion-like
particles whose masses are logarithmically hierarchical. We study the
phenomenological features of the LVS axiverse, deriving the masses of the
axions and their couplings to matter and gauge fields. We also determine when
closed string axions can solve the strong CP problem, and analyse the first
explicit examples of semi-realistic models with stable moduli and a QCD axion
candidate which is not eaten by an anomalous Abelian gauge boson. We discuss
the impact of the choice of inflationary scenario on the LVS axiverse, and
summarise the astrophysical, cosmological and experimental constraints upon it.
Moreover, we show how models can be constructed with additional light
axion-like particles that could explain some intriguing astrophysical
anomalies, and could be searched for in the next generation of axion
helioscopes and light-shining-through-a-wall experiments.Comment: 47 pages + appendices, 1 figure; v2: minor corrections and references
adde | The type IIB string axiverse and its low-energy phenomenology | the type iib string axiverse and its low-energy phenomenology | axions orientifold compactifications. fluxes moduli stabilisation axiverse characterised axion axion logarithmically hierarchical. phenomenological axiverse deriving axions couplings fields. axions solve analyse realistic moduli axion candidate eaten anomalous abelian boson. inflationary axiverse summarise astrophysical cosmological axion intriguing astrophysical anomalies searched axion helioscopes shining pages appendices minor adde | non_dup | [] |
2128705 | 10.1007/JHEP10(2012)153 | We study the spectrum of BPS D-branes on a Calabi-Yau manifold using the 0+1
dimensional quiver gauge theory that describes the dynamics of the branes at
low energies. The results of Kontsevich and Soibelman predict how the
degeneracies change. We argue that Seiberg dualities of the quiver gauge
theories, which change the basis of BPS states, correspond to crossing the
"walls of the second kind." There is a large class of examples, including local
del Pezzo surfaces, where the BPS degeneracies of quivers corresponding to one
D6 brane bound to arbitrary numbers of D4, D2 and D0 branes are counted by
melting crystal configurations. We show that the melting crystals that arise
are a discretization of the Calabi-Yau geometry. The shape of the crystal is
determined by the Calabi-Yau geometry and the background B-field, and its
microscopic structure by the quiver Q. We prove that the BPS degeneracies
computed from Q and Q' are related by the Kontsevich Soibelman formula, using a
geometric realization of the Seiberg duality in the crystal. We also show that,
in the limit of infinite B-field, the combinatorics of crystals arising from
the quivers becomes that of the topological vertex. We thus re-derive the
Gromov-Witten/Donaldson-Thomas correspondence | Wall Crossing, Quivers and Crystals | wall crossing, quivers and crystals | branes calabi manifold quiver describes branes energies. kontsevich soibelman predict degeneracies change. argue seiberg dualities quiver crossing walls kind. pezzo degeneracies quivers brane branes counted melting configurations. melting crystals arise discretization calabi geometry. calabi microscopic quiver degeneracies kontsevich soibelman geometric realization seiberg duality crystal. infinite combinatorics crystals arising quivers topological vertex. derive gromov witten donaldson thomas correspondence | non_dup | [] |
5240272 | 10.1007/JHEP10(2012)154 | Gauged off-shell Maxwell-Einstein supergravity in six dimensions with N=(1,0)
supersymmetry has a higher derivative extension afforded by a supersymmetrized
Riemann squared term. This theory admits a supersymmetric Minkowski x S^2
compactification with a U(1) monopole of unit charge on S^2. We determine the
full spectrum of the theory on this background. We also determine the spectrum
on a non-supersymmetric version of this compactification in which the monopole
charge is different from unity, and we find the peculiar feature that there are
massless gravitini in a representation of the S^2 isometry group determined by
the monopole charge.Comment: typos correcte | Spectrum of Higher Derivative 6D Chiral Supergravity | spectrum of higher derivative 6d chiral supergravity | gauged maxwell einstein supergravity supersymmetry afforded supersymmetrized riemann squared term. admits supersymmetric minkowski compactification monopole background. supersymmetric compactification monopole unity peculiar massless gravitini isometry monopole typos correcte | non_dup | [] |
5256615 | 10.1007/JHEP10(2012)155 | In the present work we consider the assignment of the factorization and
renormalization scales in hadron collider processes with associated jet
production, at next-to-leading order (NLO) in perturbation theory. We propose a
simple, definite prescription to this end, including Sudakov form factors to
consistently account for the distinct kinematic scales occuring in such
collisions. The scheme yields results that are accurate at NLO and, for a large
class of observables, it resums to all orders the large logarithms that arise
from kinematic configurations involving disparate scales. In practical terms
the method is most simply understood as an NLO extension of the matrix element
reweighting procedure employed in tree level matrix element-parton shower
merging algorithms. By way of a proof-of-concept, we apply the method to Higgs
and Z boson production in association with up to two jets.Comment: 27 pages, 17 figure | MINLO: Multi-scale improved NLO | minlo: multi-scale improved nlo | assignment factorization renormalization hadron collider perturbation theory. propose definite prescription sudakov consistently kinematic occuring collisions. observables resums orders logarithms arise kinematic configurations involving disparate scales. practical understood reweighting parton shower merging algorithms. boson pages | non_dup | [] |
24764476 | 10.1007/JHEP10(2012)156 | We consider the problem of computing N=2 superconformal block functions. We
argue that the Kazama-Suzuki coset realization of N=2 superconformal algebra in
terms of the affine sl(2) algebra provides relations between N=2 and affine
sl(2) conformal blocks. We show that for N=2 chiral fields the corresponding
sl(2) construction of the conformal blocks is based on the ordinary highest
weight representation. We use an AGT-type correspondence to relate the
four-point sl(2) conformal block with Nekrasov's instanton partition functions
of a four-dimensional N=2 SU(2) gauge theory in the presence of a surface
operator. Since the previous relation proposed by Alday and Tachikawa requires
some special modification of the conformal block function, we revisit this
problem and find direct correspondence for the four-point conformal block. We
thus find an explicit representation for the affine sl(2) four-point conformal
block and hence obtain an explicit combinatorial representation for the N=2
chiral four-point conformal block.Comment: 15 page | Conformal blocks of Chiral fields in N=2 SUSY CFT and Affine Laumon
Spaces | conformal blocks of chiral fields in n=2 susy cft and affine laumon spaces | superconformal functions. argue kazama suzuki coset realization superconformal affine affine conformal blocks. chiral conformal blocks ordinary representation. correspondence relate conformal nekrasov instanton partition operator. alday tachikawa modification conformal revisit correspondence conformal block. affine conformal combinatorial chiral conformal | non_dup | [] |
9259953 | 10.1007/JHEP10(2012)159 | We study the thermodynamical torus partition function of superstring on the
near-extremal black NS5-brane background. The exact partition function has been
computed with the helps of our previous works:[arXiv:1012.5721 [hep-th]],
[arXiv:1109.3365 [hep-th]], and naturally decomposed into two parts. The first
part is contributed from strings freely propagating in the asymptotic region,
which are identified as the superstring gas at the Hawking temperature on the
linear-dilaton background. The second part includes the contribution localized
around the `tip of cigar', which characterizes the non-extremality. Remarkably,
the latter part includes massless excitations with non-vanishing thermal
winding, which signifies that the Hagedorn-like behavior effectively appears,
even though the Hawking temperature is much lower than the Hagedorn
temperature. We also explore the high-temperature backgrounds defined by the
orbifolding along the Euclidean time direction. In those cases, the thermal
winding modes localized around the tip are found to be tachyonic, reflecting
the singularities of Euclidean backgrounds caused by orbifolding.Comment: 1+29 pages, no figure; v2 the footnote 1 is enhanced, to appear in
JHE | Thermodynamics of Superstring on Near-extremal NS5 and Effective
Hagedorn Behavior | thermodynamics of superstring on near-extremal ns5 and effective hagedorn behavior | thermodynamical torus partition superstring extremal brane background. partition helps naturally decomposed parts. contributed strings freely propagating asymptotic superstring hawking dilaton background. localized cigar characterizes extremality. remarkably massless excitations vanishing winding signifies hagedorn effectively hawking hagedorn temperature. explore backgrounds orbifolding euclidean direction. winding localized tachyonic reflecting singularities euclidean backgrounds pages footnote | non_dup | [] |
5240992 | 10.1007/JHEP10(2012)160 | We propose a local renormalization group procedure where length scale is
changed in spacetime dependent way. Combining this scheme with an earlier
observation that high energy modes in renormalization group play the role of
dynamical sources for low energy modes at each scale, we provide a prescription
to derive background independent holographic duals for field theories. From a
first principle construction, it is shown that the holographic theory dual to a
D-dimensional matrix field theory is a (D+1)-dimensional quantum theory of
gravity coupled with matter fields of various spins. The gravitational theory
has (D+1) first-class constraints which generate local spacetime
transformations in the bulk. The (D+1)-dimensional diffeomorphism invariance is
a consequence of the freedom to choose different local RG schemes.Comment: 34 pages, 4 figures; v2) sections VIII and IX added; v3) typos
corrected (to appear in JHEP | Background independent holographic description : From matrix field
theory to quantum gravity | background independent holographic description : from matrix field theory to quantum gravity | propose renormalization changed spacetime way. combining renormalization prescription derive holographic duals theories. holographic spins. gravitational spacetime transformations bulk. diffeomorphism invariance freedom pages viii typos corrected jhep | non_dup | [] |
5238968 | 10.1007/JHEP10(2012)161 | A long-standing puzzle in charm physics is the large difference between the
D0 -> K+ K- and D0 -> pi+ pi- decay rates. Recently, the LHCb and CDF
collaborations reported a surprisingly large difference between the direct CP
asymmetries, Delta A_CP, in these two modes. We show that the two puzzles are
naturally related in the Standard Model via s- and d-quark "penguin
contractions". Their sum gives rise to Delta A_CP, while their difference
contributes to the two branching ratios with opposite sign. Assuming nominal
SU(3) breaking, a U-spin fit to the D0 -> K+ pi-, pi+ K-, pi+ pi-, K+ K- decay
rates yields large penguin contractions that naturally explain Delta A_CP.
Expectations for the individual CP asymmetries are also discussed.Comment: 24 pages, 8 figure | A consistent picture for large penguins in D -> pi+ pi-, K+ K- | a consistent picture for large penguins in d -> pi+ pi-, k+ k- | standing puzzle charm rates. lhcb collaborations surprisingly asymmetries delta modes. puzzles naturally penguin contractions delta contributes branching opposite sign. nominal breaking penguin contractions naturally delta expectations asymmetries pages | non_dup | [] |
9259627 | 10.1007/JHEP10(2012)163 | We construct an explicit example of a de Sitter vacuum in type IIB string
theory that realizes the proposal of K\"ahler uplifting. As the large volume
limit in this method depends on the rank of the largest condensing gauge group
we carry out a scan of gauge group ranks over the Kreuzer-Skarke set of toric
Calabi-Yau threefolds. We find large numbers of models with the largest gauge
group factor easily exceeding a rank of one hundred. We construct a global
model with K\"ahler uplifting on a two-parameter model on
$\mathbb{CP}^4_{11169}$, by an explicit analysis from both the type IIB and
F-theory point of view. The explicitness of the construction lies in the
realization of a D7 brane configuration, gauge flux and RR and NS flux choices,
such that all known consistency conditions are met and the geometric moduli are
stabilized in a metastable de Sitter vacuum with spontaneous GUT scale
supersymmetry breaking driven by an F-term of the K\"ahler moduli.Comment: 61 pages, 6 figure | Building an explicit de Sitter | building an explicit de sitter | sitter realizes proposal ahler uplifting. condensing carry scan ranks kreuzer skarke toric calabi threefolds. exceeding hundred. ahler uplifting mathbb view. explicitness lies realization brane choices consistency geometric moduli stabilized metastable sitter spontaneous supersymmetry breaking ahler pages | non_dup | [] |
5255339 | 10.1007/JHEP10(2012)169 | We present a QCD analysis of heavy quark mesons focussing on the B -> D*
formfactor at zero recoil, F_D*(1). An advanced treatment of the perturbative
corrections in the Wilsonian approach is presented. We estimate the
higher-order power corrections to the OPE sum rule and describe a refined
analysis of the nonresonant continuum contribution. In the framework of a
model-independent approach, we show that the inelastic contribution in the
phenomenological part of the OPE is related to the mQ-dependence of the
hyperfine splitting and conclude that the former is large, lowering the
prediction for F_D*(1) down to about 0.86. This likewise implies an enhanced
yield of radial and D-wave charm excitations in semileptonic B decays and
alleviates the problem with the inclusive yield of the wide excited states. We
also apply the approach to the expectation values of dimension 7 and 8 local
operators and to a few other issues in the heavy quark expansion.Comment: 70 pages, 13 figure | B-> D* zero-recoil formfactor and the heavy quark expansion in QCD: a
systematic study | b-> d* zero-recoil formfactor and the heavy quark expansion in qcd: a systematic study | mesons focussing formfactor recoil advanced perturbative wilsonian presented. refined nonresonant continuum contribution. inelastic phenomenological hyperfine splitting former lowering likewise charm excitations semileptonic decays alleviates inclusive excited states. expectation pages | non_dup | [] |
9258277 | 10.1007/JHEP10(2012)170 | We use a variational technique to study heavy glueballs on gauge
configurations generated with 2+1 flavours of ASQTAD improved staggered
fermions. The variational technique includes glueball scattering states. The
measurements were made using 2150 configurations at 0.092 fm with a pion mass
of 360 MeV. We report masses for 10 glueball states. We discuss the prospects
for unquenched lattice QCD calculations of the oddballs.Comment: 19 pages, 4 tables and 8 figures. One figure added. Now matches the
published versio | Towards the glueball spectrum from unquenched lattice QCD | towards the glueball spectrum from unquenched lattice qcd | variational glueballs configurations flavours asqtad staggered fermions. variational glueball states. configurations pion mev. glueball states. prospects unquenched pages tables figures. added. matches versio | non_dup | [] |
2104078 | 10.1007/JHEP10(2012)171 | We consider an instance of the AdS/CFT duality where the bulk theory contains
an open string tachyon, and study the instability from the viewpoint of the
boundary field theory. We focus on the specific example of the AdS_5 X S^5
background with two probe D7 branes intersecting at general angles. For generic
angles supersymmetry is completely broken and there is an open string tachyon
between the branes. The field theory action for this system is obtained by
coupling to N =4 super Yang-Mills two N =2 hyper multiplets in the fundamental
representation of the SU(N) gauge group, but with different choices of
embedding of the two N=2 subalgebras into N=4. On the field theory side we find
a one-loop Coleman-Weinberg instability in the effective potential for the
fundamental scalars. We identify a mesonic operator as the dual of the open
string tachyon. By AdS/CFT, we predict the tachyon mass for small 't Hooft
coupling (large bulk curvature) and confirm that it violates the AdS stability
bound.Comment: 36 page | Intersecting Flavor Branes | intersecting flavor branes | duality tachyon instability viewpoint theory. branes intersecting angles. generic angles supersymmetry broken tachyon branes. super mills hyper multiplets choices embedding subalgebras coleman weinberg instability scalars. mesonic tachyon. predict tachyon hooft curvature confirm violates | non_dup | [] |
5241227 | 10.1007/JHEP10(2012)172 | The Lamb shift results from the coupling of an atom to vacuum fluctuations of
quantum fields, so corrections are expected to arise when the spacetime is
curved since the vacuum fluctuations are modified by the presence of spacetime
curvature. Here, we calculate the curvature-induced correction to the Lamb
shift outside a spherically symmetric object and demonstrate that this
correction can be remarkably significant outside a compact massive
astrophysical body. For instance, for a neutron star or a stellar mass black
hole, the correction is $\sim$ 25% at a radial distance of $4GM/c^2$, $\sim$
16% at $10GM/c^2$ and as large as $\sim$ 1.6% even at $100GM/c^2$, where $M$ is
the mass of the object, $G$ the Newtonian constant, and $c$ the speed of light.
In principle, we can look at the spectra from a distant compact super-massive
body to find such corrections. Therefore, our results suggest a possible way of
detecting fundamental quantum effects in astronomical observations.Comment: 13 pages, 3 figures, slight title change, clarifications and more
discussions added, version to be published in JHE | Can spacetime curvature induced corrections to Lamb shift be observable? | can spacetime curvature induced corrections to lamb shift be observable? | lamb atom arise spacetime curved spacetime curvature. curvature lamb spherically remarkably massive astrophysical body. neutron newtonian light. look distant super massive corrections. detecting astronomical pages slight title clarifications discussions | non_dup | [] |
9258188 | 10.1007/JHEP10(2012)173 | Bosonization is normally thought of as a purely two-dimensional phenomenon,
and generic field theories with fermions in D>2 are not expected be describable
by local bosonic actions, except in some special cases. We point out that 3D
SU(N) gauge theories on R^{1,1} x S^{1}_{L} with adjoint fermions can be
bosonized in the large N limit. The key feature of such theories is that they
enjoy large N volume independence for arbitrary circle size L. A consequence of
this is a large N equivalence between these 3D gauge theories and certain 2D
gauge theories, which matches a set of correlation functions in the 3D theories
to corresponding observables in the 2D theories. As an example, we focus on a
3D SU(N) gauge theory with one flavor of adjoint Majorana fermions and derive
the large-N equivalent 2D gauge theory. The extra dimension is encoded in the
color degrees of freedom of the 2D theory. We then apply the technique of
non-Abelian bosonization to the 2D theory to obtain an equivalent local theory
written purely in terms of bosonic variables. Hence the bosonized version of
the large N three-dimensional theory turns out to live in two dimensions.Comment: 30 pages, 2 tables. v2 minor revisions, references adde | Large N and Bosonization in Three Dimensions | large n and bosonization in three dimensions | bosonization normally thought purely phenomenon generic fermions describable bosonic cases. adjoint fermions bosonized limit. enjoy independence circle equivalence matches observables theories. flavor adjoint majorana fermions derive theory. extra encoded freedom theory. abelian bosonization purely bosonic variables. bosonized turns live pages tables. minor revisions adde | non_dup | [] |
9262413 | 10.1007/JHEP10(2012)175 | A long-standing question in string theory is to find the explicit expression
of the bosonic measure, a crucial issue also in determining the superstring
measure. Such a measure was known up to genus three. Belavin and Knizhnik
conjectured an expression for genus four which has been proved in the framework
of the recently introduced vector-valued Teichmueller modular forms. It turns
out that for g>3 the bosonic measure is expressed in terms of such forms. In
particular, the genus four Belavin-Knizhnik "wonderful formula" has a
remarkable extension to arbitrary genus whose structure is deeply related to
the characterization of the Jacobian locus. Furthermore, it turns out that the
bosonic string measure has an elegant geometrical interpretation as generating
the quadrics in P^{g-1} characterizing the Riemann surface. All this leads to
identify forms on the Siegel upper half-space that, if certain conditions
related to the characterization of the Jacobian are satisfied, express the
bosonic measure as a multiresidue in the Siegel upper half-space. We also
suggest that it may exist a super analog on the super Siegel half-space.Comment: 15 pages. Typos corrected, refs. and comments adde | Extending the Belavin-Knizhnik "wonderful formula" by the
characterization of the Jacobian | extending the belavin-knizhnik "wonderful formula" by the characterization of the jacobian | standing bosonic crucial determining superstring measure. genus three. belavin knizhnik conjectured genus proved valued teichmueller modular forms. turns bosonic forms. genus belavin knizhnik wonderful remarkable genus deeply jacobian locus. turns bosonic elegant geometrical generating quadrics characterizing riemann surface. siegel jacobian satisfied express bosonic multiresidue siegel space. super analog super siegel pages. typos corrected refs. comments adde | non_dup | [] |
5252749 | 10.1007/JHEP10(2012)178 | We discuss and provide nontrivial evidence for a large class of dualities in
three-dimensional field theories with different gauge groups. We match the full
partition functions of the dual phases for any value of the couplings to
underpin our proposals. We focus on two classes of models. The first class,
motivated by the AdS/CFT conjecture, consists of necklace U(N) quiver gauge
theories with non chiral matter fields. We also consider orientifold
projections and establish dualities among necklace quivers with alternating
orthogonal and symplectic groups. The second class consists of theories with
tensor matter fields with free theory duals. In most of these cases the
R-symmetry mixes with IR accidental symmetries and we develop the prescription
to include their contribution into the partition function and the extremization
problem accordingly.Comment: 38 pages, 3 figure, using jheppu | Refined Checks and Exact Dualities in Three Dimensions | refined checks and exact dualities in three dimensions | nontrivial dualities groups. match partition couplings underpin proposals. models. motivated conjecture necklace quiver chiral fields. orientifold projections establish dualities necklace quivers alternating orthogonal symplectic groups. duals. mixes accidental symmetries prescription partition extremization pages jheppu | non_dup | [] |
9260034 | 10.1007/JHEP10(2012)179 | We study models of gauge mediation with strongly coupled hidden sectors,
employing a hard wall background as an holographic dual description. The
structure of the soft spectrum depends crucially on the boundary conditions one
imposes on bulk fields at the IR wall. Generically, vector and fermion
correlators have poles at zero momentum, leading to gauge mediation by massive
vector messengers and/or generating Dirac gaugino masses. Instead, non-generic
choices of boundary conditions let one cover all of GGM parameter space.
Enriching the background with R-symmetry breaking scalars, the SSM soft term
structure becomes more constrained and similar to previously studied top-down
models, while retaining the more analytic control the present bottom-up
approach offers.Comment: 28 pages, 4 figures; v2: typos corrected and refs adde | Exploring Holographic General Gauge Mediation | exploring holographic general gauge mediation | mediation hidden sectors employing holographic description. crucially imposes wall. generically fermion correlators poles mediation massive messengers generating dirac gaugino masses. generic choices cover space. enriching breaking scalars constrained retaining analytic pages typos corrected refs adde | non_dup | [] |
5254694 | 10.1007/JHEP10(2012)181 | Three body decays can exhibit CP violation that arises from interfering
diagrams with different orderings of the final state particles. We construct
several momentum asymmetry observables that are accessible in a hadron collider
environment where some of the final state particles are not reconstructed and
not all the kinematic information can be extracted. We discuss the
complications that arise from the different possible production mechanisms of
the decaying particle. Examples involving heavy neutralino decays in
supersymmetric theories and heavy Majorana neutrino decays in Type-I seesaw
models are examined.Comment: 20 pages, 9 figures. Clarifying comments and one reference added,
matches published versio | Momentum asymmetries as CP violating observables | momentum asymmetries as cp violating observables | decays exhibit violation arises interfering diagrams orderings particles. asymmetry observables accessible hadron collider reconstructed kinematic extracted. complications arise decaying particle. involving neutralino decays supersymmetric majorana decays seesaw pages figures. clarifying comments matches versio | non_dup | [] |
9259741 | 10.1007/JHEP10(2012)182 | We investigate linear perturbations of spin-s fields in the Kerr-AdS black
hole and in its near-horizon geometry (NHEK-AdS), using the Teukolsky master
equation and the Hertz potential. In the NHEK-AdS geometry we solve the
associated angular equation numerically and the radial equation exactly. Having
these explicit solutions at hand, we search for linear mode instabilities. We
do not find any (non-)axisymmetric instabilities with outgoing boundary
conditions. This is in agreement with a recent conjecture relating the
linearized stability properties of the full geometry with those of its
near-horizon geometry. Moreover, we find that the asymptotic behaviour of the
metric perturbations in NHEK-AdS violates the fall-off conditions imposed in
the formulation of the Kerr/CFT correspondence (the only exception being the
axisymmetric sector of perturbations).Comment: 26 pages. 4 figures. v2: references added. matches published versio | Kerr-AdS and its Near-horizon Geometry: Perturbations and the Kerr/CFT
Correspondence | kerr-ads and its near-horizon geometry: perturbations and the kerr/cft correspondence | perturbations kerr horizon nhek teukolsky master hertz potential. nhek solve numerically exactly. instabilities. axisymmetric instabilities outgoing conditions. conjecture relating linearized horizon geometry. asymptotic perturbations nhek violates fall imposed formulation kerr correspondence exception axisymmetric perturbations .comment pages. figures. added. matches versio | non_dup | [] |
144259461 | 10.1007/JHEP10(2012)190 | We construct the BPS quivers with superpotential for the 4d N = 2 gauge theories with non-simply laced Lie groups (B n, C n, F 4 and G 2). The construction is inspired by the BIKMSV geometric engineering of these gauge groups as non-split singular elliptic fibrations. From the categorical viewpoint of arXiv:1203.6734, the fibration of the light category ℒ (g) over the (degenerate) Gaiotto curve has a monodromy given by the action of the outer automorphism of the corresponding unfolded Lie algebra. In view of the Katz-Vafa 'matter from geometry' mechanism, the monodromic idea may be extended to the construction of (Q,W) for SYM coupled to higher matter representations. This is done through a construction we call specialization. © 2012 SISSA | 4d N=2 gauge theories and quivers: the non-simply laced case | 4d n=2 gauge theories and quivers: the non-simply laced case | quivers superpotential laced inspired bikmsv geometric split singular elliptic fibrations. categorical viewpoint fibration degenerate gaiotto monodromy outer automorphism unfolded algebra. katz vafa monodromic representations. call specialization. sissa | non_dup | [] |
8781498 | 10.1007/JHEP10(2012)196 | Recently, the ATLAS and CMS collaborations have announced the discovery of a
125 GeV particle, commensurable with the Higgs boson. We analyze the 2011 and
2012 LHC and Tevatron Higgs data in the context of simplified new physics
models, paying close attention to models which can enhance the diphoton rate
and allow for a natural weak-scale theory. Combining the available LHC and
Tevatron data in the ZZ* 4-lepton, WW* 2-lepton, diphoton, and b-bbar channels,
we derive constraints on the effective low-energy theory of the Higgs boson. We
map several simplified scenarios to the effective theory, capturing numerous
new physics models such as supersymmetry, composite Higgs, dilaton. We further
study models with extended Higgs sectors which can naturally enhance the
diphoton rate. We find that the current Higgs data are consistent with the
Standard Model Higgs boson and, consequently, the parameter space in all models
which go beyond the Standard Model is highly constrained.Comment: 37 pages; v2: ATLAS dijet-tag diphoton channel added, dilaton and
doublet-singlet bugs corrected, references added; v3: ATLAS WW channel
included, comments and references adde | Higgs After the Discovery: A Status Report | higgs after the discovery: a status report | atlas collaborations announced discovery commensurable boson. analyze tevatron simplified paying enhance diphoton theory. combining tevatron lepton lepton diphoton bbar derive boson. simplified scenarios capturing numerous supersymmetry composite dilaton. sectors naturally enhance diphoton rate. boson pages atlas dijet diphoton dilaton doublet singlet bugs corrected atlas comments adde | non_dup | [] |
5251690 | 10.1007/JHEP10(2012)197 | We calculate the radiation spectrum off a qq-bar pair of a fixed opening
angle theta_qq-bar traversing a medium of length L. Multiple interactions with
the medium are handled in the harmonic oscillator approximation, valid for soft
gluon emissions. We discuss the time-scales relevant to the decoherence of
correlated partons traversing the medium and demonstrate how this relates to
the hard scale that govern medium-induced radiation. For large angle radiation,
the hard scale is given by Qhard = max(r_perp^{-1}, Qs), where r_perp =
theta_qq-bar L is the probed transverse size and Qs is the maximal transverse
momentum accumulated by the emitted gluon in the medium. These situations
define in turn two distinct regimes, which we call "dipole" and "decoherence"
regimes, respectively, and which are discussed in detail. A feature common to
both cases is that coherence of the radiation is restored at large transverse
momenta, k_\perp > Qhard.Comment: 44 pages, 8 figure | The radiation pattern of a QCD antenna in a dense medium | the radiation pattern of a qcd antenna in a dense medium | opening theta traversing handled harmonic oscillator valid gluon emissions. decoherence partons traversing relates govern radiation. qhard perp perp theta probed maximal accumulated emitted gluon medium. situations regimes call dipole decoherence regimes detail. coherence restored momenta perp pages | non_dup | [] |
24932964 | 10.1007/JHEP10(2013)001 | We classify the first few brane tilings on a genus 2 Riemann surface and
identify their toric Calabi-Yau moduli spaces. These brane tilings are
extensions of tilings on the 2-torus, which represent one of the largest known
classes of 4d N=1 superconformal field theories for D3-branes. The
classification consists of 16 distinct genus 2 brane tilings with up to 8
quiver fields and 4 superpotential terms. The Higgs mechanism is used to relate
the different theories.Comment: 86 pages, 43 figures, 13 table | Double Handled Brane Tilings | double handled brane tilings | classify brane tilings genus riemann toric calabi moduli spaces. brane tilings extensions tilings torus superconformal branes. genus brane tilings quiver superpotential terms. relate pages | non_dup | [] |
24932636 | 10.1007/JHEP10(2013)002 | We explore the effect of curvature-square corrections on Lifshitz solutions
to the Einstein-Maxwell-dilaton system. After exhibiting the renormalized
Lifshitz scaling solution to the system with parameterized R^2 corrections, we
turn to a toy model with coupling g(\phi)C_{\mu\nu\rho\sigma}^2 and demonstrate
that such a term can both stabilize the dilaton and resolve the Lifshitz
horizon to AdS_2 x R^2. As an example, we construct numerical flows from AdS_4
in the UV to an intermediate Lifshitz region and then to AdS_2 x R^2 in the
deep IR.Comment: 25 pages, 8 figures, references added and minor correction to
Appendix | Higher derivative corrections to Lifshitz backgrounds | higher derivative corrections to lifshitz backgrounds | explore curvature lifshitz einstein maxwell dilaton system. exhibiting renormalized lifshitz parameterized sigma stabilize dilaton resolve lifshitz horizon flows lifshitz pages minor | non_dup | [] |
24937662 | 10.1007/JHEP10(2013)003 | We derive a set of constraints on soliton solutions using geometric
deformations, and transformations by internal symmetries with space-dependent
parameters. We show that Derrick's theorem and a more complete set of
constraints due to Manton are special cases of these deformation constraints
(DC). We demonstrate also that known soliton solutions obey the DC, and extract
novel results by applying the constraints to systems of D-branes, taking into
account both Dirac-Born-Infeld and Wess-Zumino actions, and examining cases
with and without D-brane gauge fields. We also determine a relation with the
Hamiltonian constraint for gravitational systems, and discuss configurations of
finite extent, like Wilson lines.Comment: 43 pages, 1 figur | Deformation Constraints on Solitons and D-branes | deformation constraints on solitons and d-branes | derive soliton geometric deformations transformations symmetries parameters. derrick manton deformation soliton obey extract branes dirac born infeld wess zumino examining brane fields. gravitational configurations wilson pages figur | non_dup | [] |
24945517 | 10.1007/JHEP10(2013)006 | We present a string theoretical description, given in terms of branes and
orientifolds wrapping vanishing cycles, of the dual pairs of gauge theories
analyzed in 1210.7799. Based on the resulting construction we argue that the
duality that we observe in field theory is inherited from S-duality of type IIB
string theory. We analyze in detail the complex cone over the zeroth del Pezzo
surface and discuss an infinite family of orbifolds of flat space. For the del
Pezzo case we describe the system in terms of large volume objects, and show
that in this language the duality can be understood from the strongly coupled
behavior of the O7^+ plane, which we analyze using simple F-theory
considerations. For all cases we also give a different argument based on the
existence of appropriate torsional components of the 3-form flux lattice. Along
the way we clarify some aspects of the description of orientifolds in the
derived category of coherent sheaves, and in particular we discuss the
important role played by exotic orientifolds - ordinary orientifolds composed
with auto-equivalences of the category - when describing orientifolds of
ordinary quiver gauge theories.Comment: 51 pages, 16 figures; v2: minor changes, added references, published
versio | New N=1 dualities from orientifold transitions - Part II: String Theory | new n=1 dualities from orientifold transitions - part ii: string theory | branes orientifolds wrapping vanishing cycles argue duality inherited duality theory. analyze cone zeroth pezzo infinite orbifolds space. pezzo duality understood analyze considerations. argument torsional lattice. clarify orientifolds coherent sheaves played exotic orientifolds ordinary orientifolds composed auto equivalences describing orientifolds ordinary quiver pages minor versio | non_dup | [] |
24795298 | 10.1007/JHEP10(2013)008 | We study the perturbative behavior of the Yang-Mills gradient flow in the
Schr\"odinger Functional, both in the continuum and on the lattice. The energy
density of the flow field is used to define a running coupling at a scale given
by the size of the finite volume box. From our perturbative computation we
estimate the size of cutoff effects of this coupling to leading order in
perturbation theory. On a set of Nf=2 gauge field ensembles in a physical
volume of L ~ 0.4 fm we finally demonstrate the suitability of the coupling for
a precise continuum limit due to modest cutoff effects and high statistical
precision.Comment: LaTeX, 27 pages, 7 figures. Added section on gauge fixing. Typos
corrected. Results unchange | The gradient flow coupling in the Schr\"odinger Functional | the gradient flow coupling in the schr\"odinger functional | perturbative mills schr odinger continuum lattice. running box. perturbative cutoff perturbation theory. ensembles suitability precise continuum modest cutoff latex pages figures. fixing. typos corrected. unchange | non_dup | [] |
24936765 | 10.1007/JHEP10(2013)009 | We further explore the correspondence between N=2 supersymmetric SU(2) gauge
theory with four flavors on epsilon-deformed backgrounds and conformal field
theory, with an emphasis on the epsilon-expansion of the partition function
natural from a topological string theory point of view. Solving an appropriate
null vector decoupling equation in the semi-classical limit allows us to
express the instanton partition function as a series in quasi-modular forms of
the group Gamma(2), with the expected symmetry Weyl group of SO(8) semi-direct
S_3. In the presence of an elementary surface operator, this symmetry is
enhanced to an action of the affine Weyl group of SO(8) semi-direct S_4 on the
instanton partition function, as we demonstrate via the link between the null
vector decoupling equation and the quantum Painlev\'e VI equation.Comment: 31 pages, 1 figure; v2: typos corrected, references adde | Transformations of Spherical Blocks | transformations of spherical blocks | explore correspondence supersymmetric flavors epsilon deformed backgrounds conformal emphasis epsilon partition topological view. solving decoupling express instanton partition quasi modular gamma weyl elementary affine weyl instanton partition decoupling painlev pages typos corrected adde | non_dup | [] |
24934607 | 10.1007/JHEP10(2013)010 | We study the dynamics of N=1 supersymmetric systems consisting of the
strongly-coupled superconformal theory T_N, SU(N) gauge groups, and fundamental
chiral multiplets. We demonstrate that such systems exhibit familiar phenomena
such as deformation of the vacuum moduli space, appearance of the dynamical
superpotential, and Coulomb branches with N=1 Seiberg-Witten curves. The
analysis requires a rather detailed knowledge of the chiral ring of the T_N
theory, which will also be discussed at length.Comment: 33 pages, 2 figures; v2:Published versio | N=1 dynamics with T_N theory | n=1 dynamics with t_n theory | supersymmetric consisting superconformal chiral multiplets. exhibit familiar phenomena deformation moduli appearance superpotential coulomb branches seiberg witten curves. chiral pages versio | non_dup | [] |
24938633 | 10.1007/JHEP10(2013)012 | We present an exact analytic class of solutions for a system of two membranes
in eleven-dimensional supergravity. One brane in the system is completely
localized along the overall and relative transverse coordinates while the other
brane in the system is localized only along the overall transverse coordinates.
The membrane configuration preserves four supersymmetries. Moreover we find
some approximate solutions for the system of two membranes with a Bianchi space
as the overall transverse space to both membranes. All supergravity solutions
preserve 1/8 of the supersymmetry. Upon dimensional reduction, the solutions
provide intersecting configurations of three D-branes in type IIA supergravity.Comment: 17 pages, 5 figure | Supergravity Solutions of Two M2 Branes | supergravity solutions of two m2 branes | analytic membranes eleven supergravity. brane localized brane localized coordinates. preserves supersymmetries. approximate membranes bianchi membranes. supergravity preserve supersymmetry. intersecting configurations branes pages | non_dup | [] |
24937437 | 10.1007/JHEP10(2013)013 | We compute and study the drag force acting on a heavy quark propagating
through the matter produced in the collision of two sheets of energy in a
strongly coupled gauge theory that can be analyzed holographically. Although
this matter is initially far from equilibrium, we find that the equilibrium
expression for heavy quark energy loss in a homogeneous strongly coupled plasma
with the same instantaneous energy density or pressure as that at the location
of the quark describes many qualitative features of our results. One
interesting exception is that there is a time delay after the initial collision
before the heavy quark energy loss becomes significant. At later times, once a
liquid plasma described by viscous hydrodynamics has formed, expressions based
upon assuming instantaneous homogeneity and equilibrium provide a
semi-quantitative description of our results - as long as the rapidity of the
heavy quark is not too large. For a heavy quark with large rapidity, the
gradients in the velocity of the hydrodynamic fluid result in qualitative
consequences for the 'drag' force acting on the quark. In certain
circumstances, the force required to drag the quark through the plasma can
point opposite to the velocity of the quark, meaning that the force that the
plasma exerts on a quark moving through it acts in the same direction as its
velocity. And, generically, the force includes a component perpendicular to the
direction of motion of the quark. Our results support a straightforward
approach to modeling the drag on, and energy loss of, heavy quarks with modest
rapidity in heavy ion collisions, both before and after the quark-gluon plasma
hydrodynamizes, and provide cautionary lessons at higher rapidity.Comment: 22 pages, 20 figure | Heavy quark energy loss far from equilibrium in a strongly coupled
collision | heavy quark energy loss far from equilibrium in a strongly coupled collision | drag acting propagating collision sheets holographically. initially homogeneous instantaneous describes qualitative results. exception delay collision significant. viscous hydrodynamics expressions instantaneous homogeneity rapidity large. rapidity gradients hydrodynamic qualitative consequences drag acting quark. circumstances drag opposite meaning exerts moving acts velocity. generically perpendicular quark. straightforward drag quarks modest rapidity collisions gluon hydrodynamizes cautionary lessons pages | non_dup | [] |
24950152 | 10.1007/JHEP10(2013)014 | Starting with a holographic construction for a fractional quantum Hall state
based on the D3-D7' system, we explore alternative quantization conditions for
the bulk gauge fields. This gives a description of a quantum Hall state with
various filling fractions. For a particular alternative quantization of the
bulk gauge fields, we obtain a holographic anyon fluid in a vanishing
background magnetic field. We show that this system is a superfluid, exhibiting
the relevant gapless excitation.Comment: 23 pages, 7 figures; v2: typos fixed, published version; v3: typo
fixe | Holographic anyonic superfluidity | holographic anyonic superfluidity | holographic fractional hall explore quantization fields. hall filling fractions. quantization holographic anyon vanishing field. superfluid exhibiting gapless pages typos typo fixe | non_dup | [] |
24948879 | 10.1007/JHEP10(2013)015 | A general class of axionic and electrically charged black holes for a
self-interacting scalar field nonminimally coupled to Einstein gravity with a
negative cosmological constant is presented. These solutions are the first
examples of black holes with an arbitrary nonminimal coupling $\xi$ in four
dimensions. Moreover, due to the presence of two three-forms fields, the
topology of the horizon of these black holes is planar. We discuss some
properties of these solutions electing particular values of the nonminimal
coupling parameter. A special case arises when $\xi=1/4$, for which the
gravitational field is confined in a region close to the event horizon. We also
show that these black holes emerge from stealth AdS configurations as the
axionic fields are switched on, and that they can be generated through a
Kerr-Schild transformation. Finally, in the appendix, we extend these results
to arbitrary dimension.Comment: 23 page | AdS black holes with arbitrary scalar coupling | ads black holes with arbitrary scalar coupling | axionic electrically holes interacting nonminimally einstein cosmological presented. holes nonminimal dimensions. topology horizon holes planar. electing nonminimal parameter. arises gravitational confined horizon. holes emerge stealth configurations axionic switched kerr schild transformation. extend | non_dup | [] |
24942115 | 10.1007/JHEP10(2013)016 | We study deformations of three-dimensional large N CFTs by double-trace
operators constructed from spin s single-trace operators of dimension \Delta.
These theories possess UV fixed points, and we calculate the change of the
3-sphere free energy \delta F= F_{UV}- F_{IR}. To describe the UV fixed point
using the dual AdS_4 space we modify the boundary conditions on the spin s
field in the bulk; this approach produces \delta F in agreement with the field
theory calculations. If the spin s operator is a conserved current, then the
fixed point is described by an induced parity invariant conformal spin s gauge
theory. The low spin examples are QED_3 (s=1) and the 3-d induced conformal
gravity (s=2). When the original CFT is that of N conformal complex scalar or
fermion fields, the U(N) singlet sector of the induced 3-d gauge theory is dual
to Vasiliev's theory in AdS_4 with alternate boundary conditions on the spin s
massless gauge field. We test this correspondence by calculating the leading
term in \delta F for large N. We show that the coefficient of (1/2)\log N in
\delta F is equal to the number of spin s-1 gauge parameters that act trivially
on the spin s gauge field. We discuss generalizations of these results to 3-d
gauge theories including Chern-Simons terms and to theories where s is
half-integer. We also argue that the Weyl anomaly a-coefficients of conformal
spin s theories in even dimensions d, such as that of the Weyl-squared gravity
in d=4, can be efficiently calculated using massless spin s fields in AdS_{d+1}
with alternate boundary conditions. Using this method we derive a simple
formula for the Weyl anomaly a-coefficients of the d=4 Fradkin-Tseytlin
conformal higher-spin gauge fields. Similarly, using alternate boundary
conditions in AdS_3 we reproduce the well-known central charge c=-26 of the bc
ghosts in 2-d gravity, as well as its higher-spin generalizations.Comment: 62 pages, 1 figure; v2 refs added, minor improvements; v3 refs added,
minor improvement | AdS Description of Induced Higher-Spin Gauge Theory | ads description of induced higher-spin gauge theory | deformations cfts trace trace delta. possess sphere delta modify produces delta calculations. conserved parity conformal theory. conformal conformal fermion singlet vasiliev alternate massless field. correspondence calculating delta delta trivially field. generalizations chern simons integer. argue weyl anomaly conformal weyl squared efficiently massless alternate conditions. derive weyl anomaly fradkin tseytlin conformal fields. alternate reproduce ghosts pages refs minor improvements refs minor | non_dup | [] |
159081815 | 10.1007/JHEP10(2013)018 | Recently a prescription to compute the four-dimensional N = 2 superconformal index in the presence of certain BPS surface defects has been given. These surface defects are labelled by symmetric representations of SU(N). In the present paper we give a prescription to compute the superconformal index in the presence of surface defects labelled by arbitrary representations of SU(N). Furthermore, we extend the dictionary between the N =2superconformalSchur-indexandcorrelatorsofq-deformedYang-Millstoincorporate such surface defects | Surface defects, the superconformal index and q-deformed Yang-Mills. | surface defects, the superconformal index and q-deformed yang-mills. | prescription superconformal defects given. defects labelled representations prescription superconformal defects labelled representations extend dictionary superconformalschur indexandcorrelatorsofq deformedyang millstoincorporate defects | non_dup | [] |
24948374 | 10.1007/JHEP10(2013)019 | We construct new asymptotically AdS_4 solutions dual to 2+1 CFTs at finite
density and zero temperature by combining the ingredients of the electron star
and the holographic superconductor. The solutions, which we call "compact
electron stars", contain both a fermionic fluid and charged scalar hair in the
bulk. We show that the new solutions are thermodynamically favoured in the
region of parameter space where they exist. Along the boundary of this region,
we find evidence for a continuous phase transition between the holographic
superconductor and the compact star solution.Comment: 31 pages, 10 figures; added reference | Dressing the Electron Star in a Holographic Superconductor | dressing the electron star in a holographic superconductor | asymptotically cfts combining ingredients holographic superconductor. call fermionic hair bulk. thermodynamically favoured exist. holographic superconductor pages | non_dup | [] |
24937537 | 10.1007/JHEP10(2013)020 | Considering the CP violating phases, we analyze the neutron electric dipole
moment (EDM) in a CP violating supersymmetric extension of the standard model
where baryon and lepton numbers are local gauge symmetries(BLMSSM). The
contributions from the one loop diagrams and the Weinberg operators are taken
into account. Adopting some assumptions on the relevant parameter space, we
give the numerical results analysis. The numerical results for neutron EDM can
reach $1.05\times 10^{-25}(e.cm)$, which is about the experimental upper limit | Neutron electric dipole moment in CP violating BLMSSM | neutron electric dipole moment in cp violating blmssm | violating analyze neutron dipole moment violating supersymmetric baryon lepton symmetries blmssm diagrams weinberg account. adopting assumptions analysis. neutron e.cm | non_dup | [] |
24936876 | 10.1007/JHEP10(2013)022 | We study the dynamics of ultrarelativistic D-branes. The dominant phenomenon
is bremsstrahlung: mild acceleration induced by closed string interactions
triggers extremely rapid energy loss through radiation of massless closed
strings. After characterizing bremsstrahlung from a general k-dimensional
extended object in a D-dimensional spacetime, we incorporate effects specific
to D-branes, including velocity-dependent forces and open string pair creation.
We then show that dissipation due to bremsstrahlung can substantially alter the
dynamics in DBI inflation.Comment: 36 pages, 6 figure | D-brane Bremsstrahlung | d-brane bremsstrahlung | ultrarelativistic branes. phenomenon bremsstrahlung mild acceleration triggers extremely massless strings. characterizing bremsstrahlung spacetime incorporate branes forces creation. dissipation bremsstrahlung substantially alter pages | non_dup | [] |
24947233 | 10.1007/JHEP10(2013)024 | We study azimuthal asymmetries in heavy quark pair production in unpolarized
electron-proton and proton-proton collisions, where the asymmetries originate
from the linear polarization of gluons inside unpolarized hadrons. We provide
cross section expressions and study the maximal asymmetries allowed by
positivity, for both charm and bottom quark pair production. The upper bounds
on the asymmetries are shown to be very large depending on the transverse
momentum of the heavy quarks, which is promising especially for their
measurements at a possible future Electron-Ion Collider or a Large Hadron
electron Collider. We also study the analogous processes and asymmetries in
muon pair production as a means to probe linearly polarized photons inside
unpolarized protons. For increasing invariant mass of the muon pair the
asymmetries become very similar to the heavy quark pair ones. Finally, we
discuss the process dependence of the results that arises due to differences in
color flow and address the problem with factorization in case of proton-proton
collisions.Comment: 16 pages, 3 figure | Linear polarization of gluons and photons in unpolarized collider
experiments | linear polarization of gluons and photons in unpolarized collider experiments | azimuthal asymmetries unpolarized proton proton proton collisions asymmetries originate gluons unpolarized hadrons. expressions maximal asymmetries positivity charm production. bounds asymmetries quarks promising collider hadron collider. analogous asymmetries muon linearly polarized photons unpolarized protons. muon asymmetries ones. arises factorization proton proton pages | non_dup | [] |
24950383 | 10.1007/JHEP10(2013)025 | We study the consequences of unbroken rigid supersymmetry of four-dimensional
field theories placed on curved manifolds. We show that in Lorentzian signature
the background vector field coupling to the R-current is determined by the Weyl
tensor of the background metric. In Euclidean signature, the same holds if two
supercharges of opposite R-charge are preserved, otherwise the (anti-)self-dual
part of the vector field-strength is fixed by the Weyl tensor. As a result of
this relation, the trace and R-current anomalies of superconformal field
theories simplify, with the trace anomaly becoming purely topological. In
particular, in Lorentzian signature, or in the presence of two Euclidean
supercharges of opposite R-charge, supersymmetry of the background implies that
the term proportional to the central charge c vanishes, both in the trace and
R-current anomalies. This is equivalent to the vanishing of a superspace Weyl
invariant. We comment on the implications of our results for holography.Comment: 33 pages; v2: minor changes, references added; v3: typos corrected,
minor improvements; v4: equations (5.9) and (5.10) of v3 correcte | Supersymmetry on curved spaces and superconformal anomalies | supersymmetry on curved spaces and superconformal anomalies | consequences unbroken rigid supersymmetry placed curved manifolds. lorentzian signature weyl metric. euclidean signature supercharges opposite preserved weyl tensor. trace anomalies superconformal simplify trace anomaly becoming purely topological. lorentzian signature euclidean supercharges opposite supersymmetry vanishes trace anomalies. vanishing superspace weyl invariant. comment pages minor typos corrected minor improvements correcte | non_dup | [] |
24948671 | 10.1007/JHEP10(2013)027 | We present the asymptotic analysis of 3D conformal gravity as a SO(3,2)
Chern-Simons gauge theory with Minkowskian (flat) and AdS boundary conditions.
We further extend these boundary conditions to the case where the Weyl mode and
the partial massless mode are allowed to fluctuate. The latter leads to loosing
one copy of the Virasoro algebra and the former to a u(1) current extension of
the asymptotic symmetry algebra and shifting the Virasoro central charge by
one. We also give a pedagogical canonical and asymptotic analysis of 3D pure
gravity as an ISO(2,1) Chern-Simons gauge theory with flat boundary conditions.Comment: 19 pages; v2: minor changes, to appear in JHE | Flat/AdS boundary conditions in three dimensional conformal gravity | flat/ads boundary conditions in three dimensional conformal gravity | asymptotic conformal chern simons minkowskian conditions. extend weyl massless fluctuate. loosing copy virasoro former asymptotic shifting virasoro one. pedagogical canonical asymptotic chern simons pages minor | non_dup | [] |
24935967 | 10.1007/JHEP10(2013)029 | The nature of the electroweak phase transition in two-Higgs-doublet models is
revisited in light of the recent LHC results. A scan over an extensive region
of their parameter space is performed, showing that a strongly first-order
phase transition favours a light neutral scalar with SM-like properties,
together with a heavy pseudo-scalar (m_A^0 > 400 GeV) and a mass hierarchy in
the scalar sector, m_H^+ < m_H^0 < m_A^0. We also investigate the h^0 -> gamma
gamma decay channel and find that an enhancement in the branching ratio is
allowed, and in some cases even preferred, when a strongly first-order phase
transition is required | A strong electroweak phase transition in the 2HDM after LHC8 | a strong electroweak phase transition in the 2hdm after lhc8 | electroweak doublet revisited results. scan extensive favours neutral pseudo hierarchy gamma gamma enhancement branching preferred | non_dup | [] |
24937959 | 10.1007/JHEP10(2013)031 | We derive dynamical and gravitational lensing properties of local sources in
the Hassan-Rosen bimetric gravity theory. Observations of elliptical galaxies
rule out values of the effective length-scale of the theory, in units of the
Hubble radius, in the interval 10^-6 < lambda_g/r_H < 10^-3, unless the
proportionality constant between the metrics at the background level is far
from unity, in which case general relativity is effectively restored for local
sources. In order to have background solutions resembling the concordance
cosmological model, without fine-tuning of the parameters of the model, we are
restricted to the upper interval, or lambda_g/r_H ~ 1. Except for a limited
range of parameter values, the Hassan-Rosen theory is thus consistent with the
observed lensing and dynamical properties of elliptical galaxies.Comment: 24 pages, 2 figures. Matches version accepted for publication in JHE | Strong lensing constraints on bimetric massive gravity | strong lensing constraints on bimetric massive gravity | derive gravitational lensing hassan rosen bimetric theory. elliptical hubble lambda unless proportionality metrics unity relativity effectively restored sources. resembling concordance cosmological fine tuning restricted lambda hassan rosen lensing elliptical pages figures. matches publication | non_dup | [] |
24942751 | 10.1007/JHEP10(2013)032 | Asymmetric dark matter (ADM) has been an attractive possibility attempting to
explain the observed ratio of baryon to dark matter abundance in the universe.
While a bosonic ADM is constrained by the limits from existence of old neutron
stars, a fermionic ADM requires an additional light particle in order to
annihilate its symmetric component in the early universe. We revisit the
phenomenology of a minimal GeV scale fermionic ADM model including a light
scalar state. The current constraints on this scenario from cosmology, dark
matter direct detection, flavour physics and collider searches are investigated
in detail. We estimate the future reach on the model parameter space from
next-generation dark matter direct detection experiments, Higgs boson property
measurements and search for light scalars at the LHC, as well as the
determination of Higgs invisible branching ratio at the proposed ILC.Comment: 31 pages, 7 figures; v2: comments and references added, version as
published in JHE | Phenomenology of Light Fermionic Asymmetric Dark Matter | phenomenology of light fermionic asymmetric dark matter | asymmetric attractive attempting baryon abundance universe. bosonic constrained neutron fermionic annihilate universe. revisit phenomenology fermionic state. cosmology flavour collider searches detail. boson scalars invisible branching pages comments | non_dup | [] |
24948889 | 10.1007/JHEP10(2013)033 | We present a complete and extensive analysis of associated chargino and
neutralino production in the framework of a supersymmetric theory augmented by
left-right symmetry. This model provides additional gaugino and higgsino states
in both the neutral and charged sectors, thus potentially enhancing new physics
signals at the LHC. For a choice of benchmark scenarios, we calculate cross
sections for 7, 8 and 14 TeV. We then simulate events expected to be produced
at the LHC, and classify them according to the number of leptons in the final
state. We devise methods to reduce the background and compare the signals with
consistently simulated events for the Minimal Supersymmetric Standard Model. We
pinpoint promising scenarios where left-right symmetric supersymmetric signals
can be distinguished both from background and from the Minimal Supersymmetric
Standard Model events.Comment: 42 pages, 12 figures, 11 tables, version accepted by JHE | Chargino and neutralino production at the Large Hadron Collider in
left-right supersymmetric models | chargino and neutralino production at the large hadron collider in left-right supersymmetric models | extensive chargino neutralino supersymmetric augmented symmetry. gaugino higgsino neutral sectors potentially enhancing lhc. benchmark scenarios tev. simulate classify leptons state. devise consistently supersymmetric model. pinpoint promising scenarios supersymmetric distinguished supersymmetric pages tables | non_dup | [] |
24949731 | 10.1007/JHEP10(2013)034 | There are two evidences for information loss during black hole evaporation:
(i) a pure state evolves to a mixed state and (ii) the map from the initial
state to final state is non-invertible. Any proposed resolution of the
information paradox must address both these issues. The firewall argument
focuses only on the first and this leads to order one deviations from the Unruh
vacuum for maximally entangled black holes. The nature of the argument does not
extend to black holes in pure states. It was shown by Avery, Puhm and the
author that requiring the initial state to final state map to be invertible
mandates structure at the horizon even for pure states. The proof works if
black holes can be formed in generic states and in this paper we show that this
is indeed the case. We also demonstrate how models proposed by Susskind,
Papadodimas et al. and Maldacena et al. end up making the initial to final
state map non-invertible and thus make the horizon "cool" at the cost of
unitarity.Comment: 22 pages + references, 4 figures. v2: References added, typos
correcte | Cool horizons lead to information loss | cool horizons lead to information loss | evidences evaporation evolves invertible. paradox issues. firewall argument focuses deviations unruh maximally entangled holes. argument extend holes states. avery puhm requiring invertible mandates horizon states. holes generic case. susskind papadodimas maldacena invertible horizon cool pages figures. typos correcte | non_dup | [] |
24931301 | 10.1007/JHEP10(2013)036 | We find an exact analytical solution of the Y-system describing a cusped
Wilson line in the planar limit of N=4 SYM. Our explicit solution describes
anomalous dimensions of this family of observables for any value of the `t
Hooft coupling and arbitrary R-charge L of the local operator inserted on the
cusp in a near-BPS limit. Our finding generalizes the previous results of one
of the authors & Sever and passes several nontrivial tests. First, for a
particular case L=0 we reproduce the predictions of localization techniques.
Second, we show that in the classical limit our result perfectly reproduces the
existing prediction from classical string theory. In addition, we made a
comparison with all existing weak coupling results and we found that our result
interpolates smoothly between these two very different regimes of AdS/CFT. As a
byproduct we found a generalization of the essential parts of the FiNLIE
construction for the gamma-deformed case and discuss our results in the
framework of the novel ${\bf P}\mu$-formulation of the spectral problem.Comment: 39 pages, 4 figures; v2: minor corrections, references added; v3:
typos fixed, references updated; v4: typos fixe | Analytic Solution of Bremsstrahlung TBA II: Turning on the Sphere Angle | analytic solution of bremsstrahlung tba ii: turning on the sphere angle | describing cusped wilson planar sym. describes anomalous observables hooft inserted cusp limit. generalizes sever passes nontrivial tests. reproduce localization techniques. perfectly reproduces theory. interpolates smoothly regimes cft. byproduct generalization finlie gamma deformed formulation pages minor typos updated typos fixe | non_dup | [] |
24940377 | 10.1007/JHEP10(2013)037 | We present the master integrals needed for the light fermionic two-loop
corrections to top quark pair production in the gluon fusion channel. Via the
method of differential equations we compute the results in terms of multiple
polylogarithms in a Laurent series about d=4, where d is the space-time
dimension. The most involved topology is a non-planar double box with one
internal mass. We employ the coproduct-augmented symbol calculus and show that
significant simplifications are possible for selected results using an
optimised set of multiple polylogarithms.Comment: 20 pages, 1 figure, 2 ancillary file | Massive planar and non-planar double box integrals for light Nf
contributions to gg->tt | massive planar and non-planar double box integrals for light nf contributions to gg->tt | master integrals fermionic gluon fusion channel. polylogarithms laurent dimension. topology planar mass. employ coproduct augmented symbol calculus simplifications optimised pages ancillary file | non_dup | [] |
24939819 | 10.1007/JHEP10(2013)040 | There are two common non-linear realizations of the 4D conformal group: in
the first, the dilaton is the conformal factor of the effective metric
\eta_{\mu\nu} e^{-2 \pi}; in the second it describes the fluctuations of a
brane in AdS_5. The two are related by a complicated field redefinition, found
by Bellucci, Ivanov and Krivonos (2002) to all orders in derivatives. We show
that this field redefinition can be understood geometrically as a change of
coordinates in AdS_5. In one gauge the brane is rigid at a fixed radial
coordinate with a conformal factor on the AdS_5 boundary, while in the other
one the brane bends in an unperturbed AdS_5. This geometrical picture
illuminates some aspects of the mapping between the two representations. We
show that the conformal Galileons in the two representations are mapped into
each other in a quite non-trivial way: the DBI action, for example, is mapped
into a complete linear combination of all the five Galileons in the other
representation. We also verify the equivalence of the dilaton S-matrix in the
two representations and point out that the aperture of the dilaton light-cone
around non-trivial backgrounds is not the same in the two representations.Comment: 16 pages. v2: typos corrected (notably eq 4.5), matches JHEP versio | Non-linear Representations of the Conformal Group and Mapping of
Galileons | non-linear representations of the conformal group and mapping of galileons | realizations conformal dilaton conformal describes brane complicated redefinition bellucci ivanov krivonos orders derivatives. redefinition understood geometrically brane rigid coordinate conformal brane bends unperturbed geometrical picture illuminates representations. conformal galileons representations mapped trivial mapped galileons representation. verify equivalence dilaton representations aperture dilaton cone trivial backgrounds pages. typos corrected notably matches jhep versio | non_dup | [] |
24953371 | 10.1007/JHEP10(2013)041 | A general quantum mechanical or quantum field theoretical system in the path
integral formulation has both real and complex saddles (instantons and
ghost-instantons). Resurgent asymptotic analysis implies that both types of
saddles contribute to physical observables, even if the complex saddles are not
on the integration path i.e., the associated Stokes multipliers are zero. We
show explicitly that instanton-anti-instanton and ghost--anti-ghost saddles
both affect the expansion around the perturbative vacuum. We study a self-dual
model in which the analytic continuation of the partition function to negative
values of coupling constant gives a pathological exponential growth, but a
homotopically independent combination of integration cycles (Lefschetz
thimbles) results in a sensible theory. These two choices of the integration
cycles are tied with a quantum phase transition. The general set of ideas in
our construction may provide new insights into non-perturbative QFT, string
theory, quantum gravity, and the theory of quantum phase transitions.Comment: 35 pages, 10 figures, v2: references adde | Resurgence theory, ghost-instantons, and analytic continuation of path
integrals | resurgence theory, ghost-instantons, and analytic continuation of path integrals | formulation saddles instantons ghost instantons resurgent asymptotic saddles observables saddles i.e. stokes multipliers zero. explicitly instanton instanton ghost ghost saddles perturbative vacuum. analytic continuation partition pathological exponential homotopically cycles lefschetz thimbles sensible theory. choices cycles tied transition. ideas insights perturbative pages adde | non_dup | [] |
24943943 | 10.1007/JHEP10(2013)042 | The production cross-section of B+ mesons is measured as a function of
transverse momentum pT and rapidity y in proton--proton collisions at
center-of-mass energy sqrt(s) = 7 TeV, using 2.4 fb-1 of data recorded with the
ATLAS detector at the Large Hadron Collider. The differential production
cross-sections, determined in the range 9<pT<120 GeV and y<2.25, are compared
to next-to-leading-order theoretical predictions.Comment: 20 pages plus author list (44 pages total), 6 figures, 5 tables,
submitted to JHEP. Version corresponds to published paper. All figures
including auxiliary figures are available at
https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2012-0 | Measurement of the differential cross-section of B+ meson production in
pp collisions at sqrt(s) = 7 TeV at ATLAS | measurement of the differential cross-section of b+ meson production in pp collisions at sqrt(s) = 7 tev at atlas | mesons rapidity proton proton collisions sqrt atlas hadron collider. pages pages tables submitted jhep. paper. auxiliary | non_dup | [] |
24944805 | 10.1007/JHEP10(2013)043 | General Majorana neutrino mass matrix is complex symmetric and for three
generations of neutrinos it contains 12 real parameters. We diagonalize this
general neutrino mass matrix and express the three neutrino masses, three
mixing angles, one Dirac CP phase and two Majorana phases (removing three
unphysical phases) in terms of the neutrino mass matrix elements. We apply the
results in the context of a neutrino mass matrix derived from a broken cyclic
symmetry invoking type-I seesaw mechanism. Phenomenological study of the above
mass matrix allows enough parameter space to satisfy the neutrino oscillation
data with only 10% breaking of this symmetry. In this model only normal mass
hierarchy is allowed. In addition, the Dirac CP phase and the Majorana phases
are numerically estimated. $\Sigma m_i$ and $|m_{\nu_{ee}}|$ are also
calculated.Comment: 24 pages, 3 figure | Masses, mixing angles and phases of general Majorana neutrino mass
matrix | masses, mixing angles and phases of general majorana neutrino mass matrix | majorana generations neutrinos parameters. diagonalize express angles dirac majorana removing unphysical elements. broken cyclic invoking seesaw mechanism. phenomenological satisfy oscillation breaking symmetry. hierarchy allowed. dirac majorana numerically estimated. sigma pages | non_dup | [] |
24946037 | 10.1007/JHEP10(2013)045 | In a class of 2D CFTs with higher spin symmetry, we compute thermal two-point
functions of certain scalar primary operators in the presence of nonzero
chemical potential for higher spin charge. These are shown to agree with the
same quantity calculated holographically using scalar fields propagating in a
charged black hole background of 3D higher spin gravity. This match serves as
further evidence for the duality between W_N minimal models at large central
charge and 3D higher spin gravity. It also supports a recent prescription for
computing boundary correlators of multi-trace scalar primary operators in
higher spin theories.Comment: 34 pages, 1 figur | Probing higher spin black holes from CFT | probing higher spin black holes from cft | cfts nonzero charge. agree quantity holographically propagating gravity. match serves duality gravity. supports prescription correlators trace pages figur | non_dup | [] |
24937152 | 10.1007/JHEP10(2013)047 | In this work we investigate the Higgs pair production in the MSSM and NMSSM
at the photon-photon collision of the ILC. We consider various experimental
constraints and scan over the parameter space of the MSSM and NMSSM. Then we
calculate the cross section of Higgs pair production in the allowed parameter
space and compare the results with the predictions in the SM. We find that the
large enhancement of the cross section in the MSSM is mainly due to the
contributions from the loops mediated by the stau, while in the NMSSM it is
mainly due to the contributions from the top-squark loops. For light
$m_{\tilde{\tau}_1}$ and large $\mu\tan\beta$, the production rate can be
enhanced by a factor of 18 in the MSSM (relative to the SM prediction). And for
a large trilinear soft breaking parameter $A_t$ and a moderately light
top-squark, it can also be enhanced by a factor of 2 in the NMSSM. Moreover, we
also calculate the $\chi^2$ values with the LHC Higgs data and display the
results for the parameter space with $\chi^2$ better than the SM value.Comment: 14 pages, 6 figure | Pair production of a 125 GeV Higgs boson in MSSM and NMSSM at the ILC | pair production of a 125 gev higgs boson in mssm and nmssm at the ilc | mssm nmssm collision ilc. scan mssm nmssm. enhancement mssm loops stau nmssm squark loops. tilde beta mssm trilinear breaking moderately squark nmssm. display pages | non_dup | [] |
24938416 | 10.1007/JHEP10(2013)048 | We discuss some of the analytic properties of lens space indices for 4d N=2
theories of class S. The S-duality properties of these theories highly
constrain the lens space indices, and imply in particular that they are
naturally acted upon by a set of commuting difference operators corresponding
to surface defects. We explicitly identify the difference operators to be a
matrix-valued generalization of the elliptic Ruijsenaars-Schneider model. In a
special limit these difference operators can be expressed naturally in terms of
Cherednik operators appearing in the double affine Hecke algebras, with the
eigenfunctions given by non-symmetric Macdonald polynomials.Comment: 33 pages, 3 figures, harvmac. v2: minor correction | S-duality and the N=2 Lens Space Index | s-duality and the n=2 lens space index | analytic lens indices duality constrain lens indices imply naturally acted commuting defects. explicitly valued generalization elliptic ruijsenaars schneider model. naturally cherednik appearing affine hecke algebras eigenfunctions macdonald pages harvmac. minor | non_dup | [] |
24949571 | 10.1007/JHEP10(2013)049 | It was recently proposed that all flavor mixing has a single source, namely
the mixing of the three quark and lepton families with "extra" vectorlike
fermions in 5 + 5-bar multiplets of SU(5). This was shown to lead to several
testable predictions including neutrino masses and CP-violating phases. Here it
is shown that the mixing angles within grand unified fermion multiplets are
also predicted. Proton decay branching ratios would thus give several
independent tests of the model. Certain model parameters could be determined
independently from the quark and lepton spectrum and from proton decay.Comment: 13 page | Proton Decay and the Origin of Quark and Lepton Mixing | proton decay and the origin of quark and lepton mixing | flavor lepton families extra vectorlike fermions multiplets testable violating phases. angles grand unified fermion multiplets predicted. proton branching model. independently lepton proton | non_dup | [] |
24955533 | 10.1007/JHEP10(2013)051 | The microcanonical density matrix in closed cosmology has a natural
definition as a projector on the space of solutions of Wheeler-DeWitt
equations, which is motivated by the absence of global non-vanishing charges
and energy in spatially closed gravitational systems. Using the BRST/BFV
formalism in relativistic phase space of gauge and ghost variables we derive
the path integral representation for this projector and the relevant
statistical sum. This derivation circumvents the difficulties associated with
the open algebra of noncommutative quantum Dirac constraints and the
construction/regularization of the physical inner product in the subspace of
BRS singlets. This inner product is achieved via the Batalin-Marnelius gauge
fixing in the space of BRS-invariant states, which in its turn is shown to be a
result of truncation of the BRST/BFV formalism to the "matter" sector of
relativistic phase space.Comment: 13 pages, LaTe | BRST technique for the cosmological density matrix | brst technique for the cosmological density matrix | microcanonical cosmology projector wheeler dewitt motivated vanishing charges spatially gravitational systems. brst formalism relativistic ghost derive projector sum. derivation circumvents difficulties noncommutative dirac regularization subspace singlets. batalin marnelius fixing truncation brst formalism relativistic pages | non_dup | [] |
24932555 | 10.1007/JHEP10(2013)053 | We compare calculations of the three-point correlation functions of BMN
operators at the one-loop (next-to-leading) order in the scalar SU(2) sector
from the integrability expression recently suggested by Gromov and Vieira, and
from the string field theory expression based on the effective interaction
vertex by Dobashi and Yoneya. A disagreement is found between the form-factors
of the correlation functions in the one-loop contributions. The order-of-limits
problem is suggested as a possible explanation of this discrepancy.Comment: 18 page | Three-BMN Correlation Functions: Integrability vs. String Field Theory
One-Loop Mismatch | three-bmn correlation functions: integrability vs. string field theory one-loop mismatch | integrability gromov vieira dobashi yoneya. disagreement contributions. explanation | non_dup | [] |
71048717 | 10.1007/JHEP10(2013)054 | An extension of the adjoint SU (5) model with a flavour symmetry based on the Z(4) group is investigated. The Z(4) symmetry is introduced with the aim of leading the up-and down-quark mass matrices to the Nearest-Neighbour-Interaction form. As a consequence of the discrete symmetry embedded in the SU (5) gauge group, the charged lepton mass matrix also gets the same form. Within this model, light neutrinos get their masses through type-I, type-III and one-loop radiative seesaw mechanisms, implemented, respectively, via a singlet, a triplet and an octet from the adjoint fermionic 24 fields. It is demonstrated that the neutrino phenomenology forces the introduction of at least three 24 fermionic multiplets. The symmetry SU (5) x Z(4) allows only two viable zero textures for the effective neutrino mass matrix. It is showed that one texture is only compatible with normal hierarchy and the other with inverted hierarchy in the light neutrino mass spectrum. Finally, it is also demonstrated that Z(4) freezes out the possibility of proton decay through exchange of coloured Higgs triplets at tree-level | The minimal adjoint-SU (5) x Z(4) GUT model | the minimal adjoint-su (5) x z(4) gut model | adjoint flavour investigated. nearest neighbour form. embedded lepton gets form. neutrinos radiative seesaw implemented singlet triplet octet adjoint fermionic fields. phenomenology forces fermionic multiplets. viable textures matrix. texture compatible hierarchy inverted hierarchy spectrum. freezes proton coloured triplets | non_dup | [] |
24948594 | 10.1007/JHEP10(2013)055 | In composite Higgs models light fermionic top partners often play an
important role in obtaining a 126 GeV Higgs mass. The presence of these top
partners implies that coloured vector mesons, or massive gluon partners, most
likely exist. Since the coupling between the top partners and gluon partners
can be large there are then sizeable two-loop contributions to the composite
Higgs mass. We compute the radiative correction to the Higgs mass from a gluon
partner in the minimal composite Higgs model and show that the Higgs mass is in
fact reduced. This allows the top partner masses to be increased, easing the
tension between having a light composite Higgs and heavy top partners.Comment: 19 pages, 8 figures. V2: typos corrected, references added, version
published in JHE | Radiative corrections to the composite Higgs mass from a gluon partner | radiative corrections to the composite higgs mass from a gluon partner | composite fermionic partners obtaining mass. partners coloured mesons massive gluon partners exist. partners gluon partners sizeable composite mass. radiative gluon partner composite reduced. partner easing tension composite pages figures. typos corrected | non_dup | [] |
25017633 | 10.1007/JHEP10(2013)056 | Aiming at a unified phase transition picture of the charged topological black
hole in Ho\v{r}ava-Lifshitz gravity, we investigate this issue not only in
canonical ensemble with the fixed charge case but also in grand-canonical
ensemble with the fixed potential case. We firstly perform the standard
analysis of the specific heat, the free energy and the Gibbs potential, and
then study its geometrothermodynamics. It is shown that the local phase
transition points not only witness the divergence of the specific heat, but
also witness the minimum temperature and the maximum free energy or Gibbs
potential. They also witness the divergence of the corresponding thermodynamic
scalar curvature. No matter which ensemble is chosen, the metric constructed
can successfully produce the behavior of the thermodynamic interaction and
phase transition structure while other metrics failed to predict the phase
transition point of the charged topological black hole in former literature. In
grand-canonical ensemble, we have discovered the phase transition which has not
been reported before. It is similar to the canonical ensemble in which the
phase transition only takes place when $k=-1$. But it also has its unique
characteristics that the location of the phase transition point depends on the
value of potential, which is different from the canonical ensemble where the
phase transition point is independent of the parameters. After an analytical
check of Ehrenfest scheme, we find that the new phase transition is a second
order one. It is also found that the thermodynamics of the black hole in
Horava-Lifshitz gravity is quite different from that in Einstein gravity.Comment: 24pages,11figure | A unified phase transition picture of the charged topological black hole
in Horava-Lifshitz gravity | a unified phase transition picture of the charged topological black hole in horava-lifshitz gravity | aiming unified picture topological lifshitz canonical ensemble grand canonical ensemble case. firstly gibbs geometrothermodynamics. witness divergence witness gibbs potential. witness divergence thermodynamic curvature. ensemble successfully thermodynamic metrics failed predict topological former literature. grand canonical ensemble discovered before. canonical ensemble canonical ensemble parameters. check ehrenfest one. thermodynamics horava lifshitz einstein pages | non_dup | [] |
24944816 | 10.1007/JHEP10(2013)057 | We investigate the orbifold limits of string theory compactifications with
geometric and non-geometric fluxes. Exploiting the connection between internal
fluxes and structure constants of the gaugings in the reduced supergravity
theory, we can identify the types of fluxes arising in certain classes of
freely-acting symmetric and asymmetric orbifolds. We give a general procedure
for deriving the gauge algebra of the effective gauged supergravity using the
exact CFT description at the orbifold point. We find that the asymmetry is, in
general, related to the presence of non-geometric Q- and R- fluxes. The action
of T-duality is studied explicitly on various orbifold models and the resulting
transformation of the fluxes is derived. Several explicit examples are
provided, including compactifications with geometric fluxes, Q-backgrounds
(T-folds) and R-backgrounds. In particular, we present an asymmetric Z4xZ2
orbifold in which all geometric and non-geometric fluxes {\omega}, H, Q, R are
turned on simultaneously. We also derive the corresponding flux backgrounds,
which are not in general T-dual to geometric ones, and may even simultaneously
depend non-trivially on both the coordinates and their winding T-duals.Comment: 49p, updated reference | Gauged supergravities and non-geometric Q/R-fluxes from asymmetric
orbifold CFT's | gauged supergravities and non-geometric q/r-fluxes from asymmetric orbifold cft's | orbifold compactifications geometric geometric fluxes. exploiting connection fluxes gaugings supergravity fluxes arising freely acting asymmetric orbifolds. deriving gauged supergravity orbifold point. asymmetry geometric fluxes. duality explicitly orbifold fluxes derived. compactifications geometric fluxes backgrounds folds backgrounds. asymmetric orbifold geometric geometric fluxes omega turned simultaneously. derive backgrounds geometric simultaneously trivially winding updated | non_dup | [] |
24943524 | 10.1007/JHEP10(2013)058 | We consider a class of integrable quantum field theories in 1+1 dimensions
whose classical equations have kink solutions with internal collective
coordinates that transform under a non-abelian symmetry group. These
generalised sine-Gordon theories have been shown to be related to the world
sheet theory of the string in the AdS/CFT correspondence. We provide a careful
analysis of the boundary conditions at spatial infinity complicated by the fact
that they are defined by actions with a WZ term. We go on to describe the local
and non-local charges carried by the kinks and end by showing that their
structure is perfectly consistent with the exact factorizable S-matrices that
have been proposed to describe these theories.Comment: 41 pages, more typos correcte | The Structure of Non-Abelian Kinks | the structure of non-abelian kinks | integrable kink collective transform abelian group. generalised sine gordon sheet correspondence. careful infinity complicated term. charges kinks perfectly factorizable pages typos correcte | non_dup | [] |