pinecone/core-2020-05-10-deduplication huggingface dataset:
Higgs friends and counterfeits at hadron colliders

We consider the possibility of "Higgs counterfeits" - scalars that can be
produced with cross sections comparable to the SM Higgs, and which decay with
identical relative observable branching ratios, but which are nonetheless not
responsible for electroweak symmetry breaking. We also consider a related
scenario involving "Higgs friends," fields similarly produced through gg fusion
processes, which would be discovered through diboson channels WW, ZZ, gamma
gamma, or even gamma Z, potentially with larger cross sections times branching
ratios than for the Higgs. The discovery of either a Higgs friend or a Higgs
counterfeit, rather than directly pointing towards the origin of the weak
scale, would indicate the presence of new colored fields necessary for the
sizable production cross section (and possibly new colorless but electroweakly
charged states as well, in the case of the diboson decays of a Higgs friend).
These particles could easily be confused for an ordinary Higgs, perhaps with an
additional generation to explain the different cross section, and we emphasize
the importance of vector boson fusion as a channel to distinguish a Higgs
counterfeit from a true Higgs. Such fields would naturally be expected in
scenarios with "effective Z's," where heavy states charged under the SM produce
effective charges for SM fields under a new gauge force. We discuss the
prospects for discovery of Higgs counterfeits, Higgs friends, and associated
charged fields at the LHC.Comment: 27 pages, 5 figures. References added and typos fixe
Bulk spectral function sum rule in QCD-like theories with a holographic
  dual

We derive the sum rule for the spectral function of the stress-energy tensor
in the bulk (uniform dilatation) channel in a general class of strongly coupled
field theories. This class includes theories holographically dual to a theory
of gravity coupled to a single scalar field, representing the operator of the
scale anomaly. In the limit when the operator becomes marginal, the sum rule
coincides with that in QCD. Using the holographic model, we verify explicitly
the cancellation between large and small frequency contributions to the
spectral integral required to satisfy the sum rule in such QCD-like theories.Comment: 16 pages, 2 figure
Domain wall brane in squared curvature gravity

We suggest a thick braneworld model in the squared curvature gravity theory.
Despite the appearance of higher order derivatives, the localization of gravity
and various bulk matter fields is shown to be possible. The existence of the
normalizable gravitational zero mode indicates that our four-dimensional
gravity is reproduced. In order to localize the chiral fermions on the brane,
two types of coupling between the fermions and the brane forming scalar is
introduced. The first coupling leads us to a Schr\"odinger equation with a
volcano potential, and the other a P\"oschl-Teller potential. In both cases,
the zero mode exists only for the left-hand fermions. Several massive KK states
of the fermions can be trapped on the brane, either as resonant states or as
bound states.Comment: 18 pages, 5 figures and 1 table, references added, improved version
  to be published in JHE
Microscopic Structure of Magnetic Bions

Magnetic bions---stable bound states of monopoles and twisted
("Kaluza-Klein") monopoles, carrying two units of magnetic charge---have been
shown to be the leading cause of confinement and mass gap in four-dimensional
gauge theories with massless adjoint fermions compactified on R**{1,2} x S**1,
at least at small S**1. In this paper, we study in detail the bion mechanism
and the scales involved for an SU(2) gauge group, using traditional QCD
instanton methods. We represent the vacuum functional as the partition function
of a bion-anti-bion plasma and obtain the next-to-leading dependence of the
mass gap on the S**1 size L at fixed strong-coupling scale Lambda. We find
that, at small Lambda x L, the mass gap is an increasing function of L for
theories with four massless adjoint Weyl fermions, a case left undetermined by
the previous leading-order analysis, and comment on the approach to R**4.Comment: 29 pages, 4 figure
When Anomaly Mediation is UV Sensitive

Despite its successes---such as solving the supersymmetric flavor
problem---anomaly mediated supersymmetry breaking is untenable because of its
prediction of tachyonic sleptons. An appealing solution to this problem was
proposed by Pomarol and Rattazzi where a threshold controlled by a light field
deflects the anomaly mediated supersymmetry breaking trajectory, thus evading
tachyonic sleptons. In this paper we examine an alternate class of deflection
models where the non-supersymmetric threshold is accompanied by a heavy,
instead of light, singlet. The low energy form of this model is the so-called
extended anomaly mediation proposed by Nelson and Weiner, but with potential
for a much higher deflection threshold. The existence of this high deflection
threshold implies that the space of anomaly mediated supersymmetry breaking
deflecting models is larger than previously thought.Comment: 14 pages, 1 figure (version to appear in JHEP
The Hypermultiplet with Heisenberg Isometry in N=2 Global and Local
  Supersymmetry

The string coupling of N=2 supersymmetric compactifications of type II string
theory on a Calabi-Yau manifold belongs to the so-called universal dilaton
hypermultiplet, that has four real scalars living on a quaternion-Kaehler
manifold. Requiring Heisenberg symmetry, which is a maximal subgroup of
perturbative isometries, reduces the possible manifolds to a one-parameter
family that describes the tree-level effective action deformed by the only
possible perturbative correction arising at one-loop level. A similar argument
can be made at the level of global supersymmetry where the scalar manifold is
hyper-Kaehler. In this work, the connection between global and local
supersymmetry is explicitly constructed, providing a non-trivial gravity
decoupled limit of type II strings already in perturbation theory.Comment: 24 page
A Black Ring with two Angular Momenta in Taub-NUT

We use the recently-constructed explicit duality transformation that relates
a rotating anti-D6-D4-D2-D0 black hole solution to a rotating M5-M2-P black
string to construct a non-supersymmetric black ring in Taub-NUT that has two
angular momenta, as well as M2 charges and M5 dipole moments. This is the first
black ring solution that has both dipole charges and rotation along the S^2 of
the horizon, and hence can be thought of as the "Pomeransky-Senkov" version of
the M5-M2 black ring in Taub-NUT. Its physics should provide a testing ground
for the applicability of the blackfold approach to charged rotating black
branes, and should elucidate the phase space of charged dipole rings in various
backgrounds.Comment: 20 pages, LaTe
Probing AdS Wormholes by Entanglement Entropy

In this paper, we study the Lorentzian AdS wormhole solutions constructed in
arXiv:0808.2481 [hep-th]. Each of them is a classical solution interpolating
between an AdS space and a flat space in type IIB supergravity. We calculate
the holographic entanglement entropy to probe this geometry. Our analysis shows
that there exits a mass gap in its holographic dual gauge theory and that the
entanglement between the two boundaries is rather suppressed than that we
naively expect for wormholes. We also examine the holographic conductivity on a
probe D-brane in this spacetime.Comment: 17 pages, 6 figures, v2: references adde
Thermodynamics of SU(N) Yang-Mills theories in 2+1 dimensions I - The
  confining phase

We compute the equation of state in the confining phase of SU(N) Yang-Mills
theories with N=2, 3, 4, 5 and 6 colors in 2+1 dimensions, via lattice
simulations. At low enough temperatures, the results are accurately described
by a gas of glueballs, including all known states below the two-particle
threshold. Close to the deconfinement temperature, however, this prediction
underestimates the numerical results, and the contribution from heavier
glueballs has to be included. We show that the spectral density of the latter
can be accurately described using a simple bosonic string model.Comment: 1+22 pages, 8 eps figures; v2: added comments about the uncertainties
  on the temperature scale and the pressure, expanded the discussion in section
  4, added references: version published in JHE
An alternative subtraction scheme for next-to-leading order QCD
  calculations

We propose a new subtraction scheme for next-to-leading order QCD
calculations. Our scheme is based on the momentum mapping and on the splitting
functions derived in the context of an improved parton shower formulation.
Compared to standard schemes, the new scheme features a significantly smaller
number of subtraction terms and facilitates the matching of NLO calculations
with parton showers including quantum interference. We provide formulae for the
momentum mapping and the subtraction terms, and present a detailed comparison
with the Catani-Seymour dipole subtraction for a variety of 2 -> 2 scattering
processes.Comment: 62 pages, 8 figure
Unitarity Bounds in AdS_3 Higher Spin Gravity

We study SL(N,R) Chern-Simons gauge theories in three dimensions. The choice
of the embedding of SL(2,R) in SL(N,R), together with asymptotic boundary
conditions, defines a theory of higher spin gravity. Each inequivalent
embedding leads to a different asymptotic symmetry group, which we map to an
OPE structure at the boundary. A simple inspection of these algebras indicates
that only the W_N algebra constructed using the principal embedding could admit
a unitary representation for large values of the central charge.Comment: 1+23 pages, Version 3 Appendix B revise
Galileons as Wess-Zumino Terms

We show that the galileons can be thought of as Wess-Zumino terms for the
spontaneous breaking of space-time symmetries. Wess-Zumino terms are terms
which are not captured by the coset construction for phenomenological
Lagrangians with broken symmetries. Rather they are, in d space-time
dimensions, d-form potentials for (d+1)-forms which are non-trivial co-cycles
in Lie algebra cohomology of the full symmetry group relative to the unbroken
symmetry group. We introduce the galileon algebras and construct the
non-trivial (d+1)-form co-cycles, showing that the presence of galileons and
multi-galileons in all dimensions is counted by the dimensions of particular
Lie algebra cohomology groups. We also discuss the DBI and conformal galileons
from this point of view, showing that they are not Wess-Zumino terms, with one
exception in each case.Comment: 49 pages. v2 minor changes, version appearing in JHE
Four-Dimensional SCFTs from M5-Branes

We engineer a large new set of four-dimensional N=1 superconformal field
theories by wrapping M5-branes on complex curves. We present new supersymmetric
AdS_5 M-theory backgrounds which describe these fixed points at large N, and
then directly construct the dual four-dimensional CFTs for a certain subset of
these solutions. Additionally, we provide a direct check of the central charges
of these theories by using the M5-brane anomaly polynomial. This is a companion
paper which elaborates upon results reported in arXiv:1112:5487.Comment: 45 pages, 11 figure
Many faces of low mass neutralino dark matter in the unconstrained MSSM,
  LHC data and new signals

If all strongly interacting sparticles (the squarks and the gluinos) in an
unconstrained minimal supersymmetric standard model (MSSM) are heavier than the
corresponding mass lower limits in the minimal supergravity (mSUGRA) model,
obtained by the current LHC experiments, then the existing data allow a variety
of electroweak (EW) sectors with light sparticles yielding dark matter (DM)
relic density allowed by the WMAP data. Some of the sparticles may lie just
above the existing lower bounds from LEP and lead to many novel DM producing
mechanisms not common in mSUGRA. This is illustrated by revisiting the above
squark-gluino mass limits obtained by the ATLAS Collaboration, with an
unconstrained EW sector with masses not correlated with the strong sector.
Using their selection criteria and the corresponding cross section limits, we
find at the generator level using Pythia, that the changes in the mass limits,
if any, are by at most 10-12% in most scenarios. In some cases, however, the
relaxation of the gluino mass limits are larger ($\approx 20%$). If a subset of
the strongly interacting sparticles in an unconstrained MSSM are within the
reach of the LHC, then signals sensitive to the EW sector may be obtained. This
is illustrated by simulating the $blj$$\etslash$, $l= e and \mu $, and $b\tau
j$$\etslash$ signals in i) the light stop scenario and ii) the light
stop-gluino scenario with various light EW sectors allowed by the WMAP data.
Some of the more general models may be realized with non-universal scalar and
gaugino masses.Comment: 27 pages, 1 figure, references added, minor changes in text, to
  appear in JHE
Repercussions of Flavour Symmetry Breaking on CP Violation in D-Meson
  Decays

We investigate to what extent the recently measured value for a non-vanishing
direct CP asymmetry in D0 -> K+ K- and D0 -> pi+ pi- decays can be accommodated
in the Standard Model (SM) or extensions with a constrained flavour sector, for
instance from a sequential 4th generation of quarks (4G). From the comparison
with D0 -> K- pi+ branching ratios, we establish large U-spin symmetry (d <->
s) breaking effects with large strong phases between different interfering
amplitudes. On the basis of conservative estimates on amplitude ratios - which
are supported by an analysis of the breaking of a (c <-> u) symmetry in
non-leptonic B0 decays - we find that, in the SM, direct CP asymmetries in the
pi+ pi- or K+ K- modes (or in their difference) of the order of several per
mille are still plausible. Due to the constraints on the new CP phases in the
4G model, only moderate effects compared to the SM estimates are possible. We
suggest CP studies at LHCb as well as at (Super)B-factories of several
distinctive modes, such as D+ -> Kbar(*)0 pi+, phi pi+ and Ds -> K(*)0 pi+, phi
pi+ (K+) etc., which should shed more light on the short- and long-distance
issues underlying CP violation in non-leptonic D-meson decays.Comment: 22 pages, 12 figure
Higgs and non-universal gaugino masses: no SUSY signal expected yet?

So far, no supersymmetric particles have been detected at the Large Hadron
Collider (LHC). However, the recent Higgs results have interesting implications
for the SUSY parameter space. In this paper, we study the consequences of an
LHC Higgs signal for a model with non-universal gaugino masses in the context
of SU(5) unification. The gaugino mass ratios associated with the higher
representations produce viable spectra that are largely inaccessible to the
current LHC and direct dark matter detection experiments. Thus, in light of the
Higgs results, the non-observation of SUSY is no surprise.Comment: supplementary file containing plots with log priors in ancillary
  files. v2: added some comments on more general settings and references,
  accepted for publication in JHE
U(n) Spectral Covers from Decomposition

We construct decomposed spectral covers for bundles on elliptically fibered
Calabi-Yau threefolds whose structure groups are S(U(1) x U(4)), S(U(2) x U(3))
and S(U(1) x U(1) x U(3)) in heterotic string compactifications. The
decomposition requires not only the tuning of the SU(5) spectral covers but
also the tuning of the complex structure moduli of the Calabi-Yau threefolds.
This configuration is translated to geometric data on F-theory side. We find
that the monodromy locus for two-cycles in K3 fibered Calabi-Yau fourfolds in a
stable degeneration limit is globally factorized with squared factors under the
decomposition conditions. This signals that the monodromy group is reduced and
there is a U(1) symmetry in a low energy effective field theory. To support
that, we explicitly check the reduction of a monodromy group in an appreciable
region of the moduli space for an $E_6$ gauge theory with (1+2) decomposition.
This may provide a systematic way for constructing F-theory models with U(1)
symmetries.Comment: 41 pages, 14 figures; v2: minor improvements and a reference adde
Black Holes with Primary Hair in gauged N=8 Supergravity

In this paper, we analyze the static solutions for the $U(1)^{4}$ consistent
truncation of the maximally supersymmetric gauged supergravity in four
dimensions. Using a new parametrization of the known solutions it is shown that
for fixed charges there exist three possible black hole configurations
according to the pattern of symmetry breaking of the (scalars sector of the)
Lagrangian. Namely a black hole without scalar fields, a black hole with a
primary hair and a black hole with a secondary hair respectively. This is the
first, exact, example of a black hole with a primary scalar hair, where both
the black hole and the scalar fields are regular on and outside the horizon.
The configurations with secondary and primary hair can be interpreted as a
spontaneous symmetry breaking of discrete permutation and reflection symmetries
of the action. It is shown that there exist a triple point in the thermodynamic
phase space where the three solution coexist. The corresponding phase
transitions are discussed and the free energies are written explicitly as
function of the thermodynamic coordinates in the uncharged case. In the charged
case the free energies of the primary hair and the hairless black hole are also
given as functions of the thermodynamic coordinates.Comment: 9 pages, no figure
De Sitter String Vacua from Dilaton-dependent Non-perturbative Effects

We consider a novel scenario for modulus stabilisation in IIB string
compactifications in which the Kahler moduli are stabilised by a general set-up
with two kinds of non-perturbative effects: (i) standard Kahler
moduli-dependent non-perturbative effects from gaugino condensation on
D7-branes or E3-instantons wrapping four-cycles in the geometric regime; (ii)
dilaton-dependent non-perturbative effects from gaugino condensation on
space-time filling D3-branes or E(-1)-instantons at singularities. For the
LARGE Volume Scenario (LVS), the new dilaton-dependent non-perturbative effects
provide a positive definite contribution to the scalar potential that can be
arbitrarily tuned from fluxes to give rise to de Sitter vacua. Contrary to anti
D3-branes at warped throats, this term arises from a manifestly supersymmetric
effective action. In this new scenario the "uplifting" term comes from F-terms
of blow-up modes resolving the singularity of the non-perturbative quiver. We
discuss phenomenological and cosmological implications of this mechanism. This
set-up also allows a realisation of the LVS for manifolds with zero or positive
Euler number.Comment: 22 pages + two appendices, typos correcte
Flavored Co-annihilations

Neutralino dark matter in supersymmetric models is revisited in the presence
of flavor violation in the soft supersymmetry breaking sector. We focus on
flavor violation in the sleptonic sector and study the implications for the
co-annihilation regions. Flavor violation is introduced by a single
$\tilde{\mu}_R-\tilde{\tau}_R$ insertion in the slepton mass matrix. Limits on
this insertion from BR($\tau \to \mu + \gamma$) are weak in some regions of the
parameter space where cancellations happen within the amplitudes. We look for
overlaps in parameter space where both the co-annihilation condition as well as
the cancellations within the amplitudes occur. In mSUGRA, such overlap regions
are not existent, whereas they are present in models with non-universal Higgs
boundary conditions (NUHM). The effect of flavor violation is two fold: (a) it
shifts the co-annihilation regions towards lighter neutralino masses (b) the
co-annihilation cross sections would be modified with the inclusion of flavor
violating diagrams which can contribute significantly. Even if flavor violation
is within the presently allowed limits, this is sufficient to modify the
thermally averaged cross-sections by about (10-15)% in mSUGRA and (20-30)% in
NUHM, depending on the parameter space. In the overlap regions, the flavor
violating cross sections become comparable and in some cases even dominant to
the flavor conserving ones. A comparative study of the channels is presented
for mSUGRA and NUHM cases.Comment: 38 pages, 28 figures. Significantly expanded and improved version
  with a new section on channels and new appendices on mSUGRA and
  cross-sections, version accepted for publication in JHE
The local potential approximation in quantum gravity

Within the context of the functional renormalization group flow of gravity,
we suggest that a generic f(R) ansatz (i.e. not truncated to any specific form,
polynomial or not) for the effective action plays a role analogous to the local
potential approximation (LPA) in scalar field theory. In the same spirit of the
LPA, we derive and study an ordinary differential equation for f(R) to be
satisfied by a fixed point of the renormalization group flow. As a first step
in trying to assess the existence of global solutions (i.e. true fixed point)
for such equation, we investigate here the properties of its solutions by a
comparison of various series expansions and numerical integrations. In
particular, we study the analyticity conditions required because of the
presence of fixed singularities in the equation, and we develop an expansion of
the solutions for large R up to order N=29. Studying the convergence of the
fixed points of the truncated solutions with respect to N, we find a
characteristic pattern for the location of the fixed points in the complex
plane, with one point stemming out for its stability. Finally, we establish
that if a non-Gaussian fixed point exists within the full f(R) approximation,
it corresponds to an R^2 theory.Comment: 32 pages, 7 figures; v2: "erratum" added at the end of the pape
The Messenger Sector of SUSY Flavour Models and Radiative Breaking of
  Flavour Universality

The flavour messenger sectors and their impact on the soft SUSY breaking
terms are investigated in SUSY flavour models. In the case when the flavour
scale M is below the SUSY breaking mediation scale M_S, the universality of
soft terms, even if assumed at M_S, is radiatively broken. We estimate this
effect in a broad class of models. In the CKM basis that effect gives flavour
off-diagonal soft masses comparable to the tree-level estimate based on the
flavour symmetry.Comment: 24 pages, 3 figures. v3: minor changes in the text, typos corrected,
  version accepted for publication in JHE
Holographic Magnetic Star

A warm fermionic AdS star under a homogeneous magnetic field is explored. We
obtain the relativistic Landau levels by using Dirac equation and use the
Tolman-Oppenheimer-Volkoff (TOV) equation to study the physical profiles of the
star. Bulk properties such as sound speed, adiabatic index, and entropy density
within the star are calculated analytically and numerically. Bulk temperature
increases the mass limit of the AdS star but external magnetic field has the
opposite effect. The results are partially interpreted in terms of the
pre-thermalization process of the gauge matter at the AdS boundary after the
mass injection. The entropy density is found to demonstrate similar temperature
dependence as the magnetic black brane in the AdS in certain limits regardless
of the different nature of the bulk and Hawking temperatures. Total entropy of
the AdS star is also found to be an increasing function of the bulk temperature
and a decreasing function of the magnetic field, similar behaviour to the mass
limit. Since both total entropy and mass limit are global quantities, they
could provide some hints to the value of entropy and energy of the dual gauge
matter before and during the thermalization.Comment: 39 pages, 14 figures, 1 table, comments and references added, to
  appear in JHE