pinecone/core-2020-05-10-deduplication huggingface dataset:
SUSY Higgs Mass and Collider Signals with a Hidden Valley

We propose a framework of supersymmetric extensions of the Standard Model
that can ameliorate both the SUSY Higgs mass problem and the missing
superpartner problem. New vectorlike matter fields couple to the Higgs and
provide new loop contributions to its mass. New Yukawa couplings are sizable
and large supersymmetry breaking is not needed to lift the Higgs mass. To avoid
a Landau pole for the new Yukawa couplings, these fields are charged under a
new gauge group, which confines and leads to a Hidden Valley-like
phenomenology. The Hidden Valley sector is almost supersymmetric and ordinary
sparticles decay to exotic new states which decay back to Standard Model
particles and gravitinos with reduced missing energy. We construct a simplified
model to simulate this scenario and find a viable parameter space of specific
benchmark models which ameliorates both of the major phenomenological problems
with supersymmetry.Comment: 29 pages, 8 figures; v2: version accepted for the publication in JHE
What is the gamma gamma resonance at 750 GeV?

Run 2 LHC data show hints of a new resonance in the diphoton distribution at
an invariant mass of 750 GeV. We analyse the data in terms of a new boson,
extracting information on its properties and exploring theoretical
interpretations. Scenarios covered include a narrow resonance and, as
preliminary indications suggest, a wider resonance. If the width indications
persist, the new particle is likely to belong to a strongly-interacting sector.
We also show how compatibility between Run 1 and Run 2 data is improved by
postulating the existence of an additional heavy particle, whose decays are
possibly related to dark matter.Comment: v2: 45 pages, 12 figures, final. Factor of 2 changed in table 1, 4th
  ro
Revisiting R-invariant Direct Gauge Mediation

We revisit a special model of gauge mediated supersymmetry breaking, the
"R-invariant direct gauge mediation." We pay particular attention to whether
the model is consistent with the minimal model of the \mu-term, i.e., a simple
mass term of the Higgs doublets in the superpotential. Although the
incompatibility is highlighted in view of the current experimental constraints
on the superparticle masses and the observed Higgs boson mass, the minimal
\mu-term can be consistent with the R-invariant gauge mediation model via a
careful choice of model parameters. We derive an upper limit on the gluino mass
from the observed Higgs boson mass. We also discuss whether the model can
explain the 3\sigma excess of the Z+jets+$E_T^{\rm miss}$ events reported by
the ATLAS Collaboration.Comment: 27 pages, 7 figure
How big are the smallest drops of quark-gluon plasma?

Using holographic duality, we present results for both head-on and off-center
collisions of Gaussian shock waves in strongly coupled $\mathcal N = 4$
supersymmetric Yang-Mills theory. The shock waves superficially resemble
Lorentz contracted colliding protons. The collisions results in the formation
of a plasma whose evolution is well described by viscous hydrodynamics. The
size of the produced droplet is $R \sim 1/T_{\rm eff}$ where $T_{\rm eff}$ is
the effective temperature, which is the characteristic microscopic scale in
strongly coupled plasma. These results demonstrate the applicability of
hydrodynamics to microscopically small systems and bolster the notion that
hydrodynamics can be applied to heavy-light ion collisions as well as some
proton-proton collisions.Comment: 21 pages, 7 figures, typos correcte
Spectral Sequences and Vacua in N = 2 Gauged Linear Quantum Mechanics
  with Potentials

We study the behaviour of supersymmetric ground states in a class of
one-dimensional N = 2 abelian gauged linear sigma models, including theories
for which the target space is a complete intersection in projective space, and
more generally, models with an interaction term introduced by Herbst, Hori and
Page in which the vacua correspond to elements of hypercohomology groups of
complexes of sheaves. Combining physical insights from recent work by Hori, Kim
and Yi with the use of spectral sequences, we propose a way to reconcile the
non-linear sigma model description, valid deep within a geometric phase, with
the effective Coulomb branch description, valid near a phase boundary. This
leads to a physical interpretation of the hypercohomology groups from the
perspective of the Coulomb branch, as well as an interpretation for the
spectral sequences used to compute them.Comment: 38 pages. v4: Section 3.4 rewritten and conclusions added; version to
  appear in JHE
Revealing Compressed Stops Using High-Momentum Recoils

Searches for supersymmetric top quarks at the LHC have been making great
progress in pushing sensitivity out to higher mass, but are famously plagued by
gaps in coverage around lower-mass regions where the decay phase space is
closing off. Within the common stop-NLSP / neutralino-LSP simplified model, the
line in the mass plane where there is just enough phase space to produce an
on-shell top quark remains almost completely unconstrained. Here, we show that
is possible to define searches capable of probing a large patch of this
difficult region, with S/B ~ 1 and significances often well beyond 5 sigma. The
basic strategy is to leverage the large energy gain of LHC Run 2, leading to a
sizable population of stop pair events recoiling against a hard jet. The recoil
not only re-establishes a MET signature, but also leads to a distinctive
anti-correlation between the MET and the recoil jet transverse vectors when the
stops decay all-hadronically. Accounting for jet combinatorics, backgrounds,
and imperfections in MET measurements, we estimate that Run 2 will already
start to close the gap in exclusion sensitivity with the first few 10s of
inverse-fb. By 300/fb, exclusion sensitivity may extend from stop masses of 550
GeV on the high side down to below 200 GeV on the low side, approaching the
"stealth" point at m(stop) = m(top) and potentially overlapping with limits
from top pair cross section and spin correlation measurements.Comment: 17 pages, 6 figure
Calculating Soft Radiation at One Loop

We present an efficient way to calculate the effect of soft QCD radiation at
one loop, which is needed for predictions at next-to-next-to-leading
logarithmic accuracy. We use rapidity coordinates and isolate the divergences
in the integrand. By performing manipulations with cumulative variables, we
avoid complications from plus distributions. We address rapidity divergences,
divergences with an azimuthal dependence, complicated jet boundaries and
multi-differential measurements. The process and measurements can be easily
adjusted, as we demonstrate by reproducing many existing soft functions. The
results for a general LHC process with multiple Wilson lines are obtained by
treating Wilson lines that are not back-to-back using a boost. We also obtain,
for the first time, the N-jettiness soft function for generic jet angularities,
and the collinear-soft function for the measurement of two angularities.Comment: 21 pages, 1 figure; v2: references adde
Axion phenomenology and $\theta$-dependence from $N_f = 2+1$ lattice QCD

We investigate the topological properties of $N_f = 2+1$ QCD with physical
quark masses, both at zero and finite temperature. We adopt stout improved
staggered fermions and explore a range of lattice spacings $a \sim 0.05 - 0.12$
fm. At zero temperature we estimate both finite size and finite cut-off
effects, comparing our continuum extrapolated results for the topological
susceptibility $\chi$ with predictions from chiral perturbation theory. At
finite temperature, we explore a region going from $T_c$ up to around $4\,
T_c$, where we provide continuum extrapolated results for the topological
susceptibility and for the fourth moment of the topological charge
distribution. While the latter converges to the dilute instanton gas prediction
the former differs strongly both in the size and in the temperature dependence.
This results in a shift of the axion dark matter window of almost one order of
magnitude with respect to the instanton computation.Comment: 24 pages, 12 figures, 5 tables, final version published in JHE
Anomalous Dimensions of Heavy Operators from Magnon Energies

We study spin chains with boundaries that are dual to open strings suspended
between systems of giant gravitons and dual giant gravitons. The anomalous
dimensions computed in the gauge theory are in complete quantitative agreement
with energies computed in the dual string theory. The comparison makes use of a
description in terms of magnons, generalizing results for a single maximal
giant graviton. The symmetries of the problem determine the structure of the
magnon boundary reflection/scattering matrix up to a phase. We compute a
reflection/scattering matrix element at weak coupling and verify that it is
consistent with the answer determined by symmetry. We find the
reflection/scattering matrix does not satisfy the boundary Yang-Baxter equation
so that the boundary condition on the open spin chain spoils integrability. We
also explain the interpretation of the double coset ansatz in the magnon
language.Comment: 48 pages. v2: references added, typos correcte
Di-photon excess illuminates Dark Matter

We propose a simplified model of dark matter with a scalar mediator to
accommodate the di-photon excess recently observed by the ATLAS and CMS
collaborations. Decays of the resonance into dark matter can easily account for
a relatively large width of the scalar resonance, while the magnitude of the
total width combined with the constraint on dark matter relic density lead to
sharp predictions on the parameters of the Dark Sector. Under the assumption of
a rather large width, the model predicts a signal consistent with ~300 GeV dark
matter particle in channels with large missing energy. This prediction is not
yet severely bounded by LHC Run I searches and will be accessible at the LHC
Run II in the jet plus missing energy channel with more luminosity. Our
analysis also considers astrophysical constraints, pointing out that future
direct detection experiments will be sensitive to this scenario.Comment: 23 pages, 8 figures. Added 2 figures and more discussion
Vacuum stability and supersymmetry at high scales with two Higgs
  doublets

We investigate the stability of the electroweak vacuum for two-Higgs doublet
models with a supersymmetric UV completion. The supersymmetry breaking scale is
taken to be of the order of the grand unification scale. We first study the
case where all superpartners decouple at this scale. We show that contrary to
the Standard Model with one Higgs doublet, matching to the supersymmetric UV
completion is possible if the low-scale model contains two Higgs doublets. In
this case vacuum stability and experimental constraints point towards low
values of tan(beta) < 2 and pseudoscalar masses of at least about a TeV. If the
higgsino superpartners of the Higgs fields are also kept light, the conclusions
are similar and essentially independent of the higgsino mass. Finally, if all
gauginos are also given electroweak-scale masses (split supersymmetry with two
Higgs doublets), the model cannot be matched to supersymmetry at very high
scales when requiring a 125 GeV Higgs. Light neutral and charged higgsinos
therefore emerge as a promising signature of a supersymmetric UV completion of
the Standard Model at the grand unification scale.Comment: 27 pages, 4 figures; v2: minor changes in references and text,
  results unchange
Open Mirror Symmetry for Higher Dimensional Calabi-Yau Hypersurfaces

Compactifications with fluxes and branes motivate us to study various
enumerative invariants of Calabi-Yau manifolds. In this paper, we study
non-perturbative corrections depending on both open and closed string moduli
for a class of compact Calabi-Yau manifolds in general dimensions. Our analysis
is based on the methods using relative cohomology and generalized
hypergeometric system. For the simplest example of compact Calabi-Yau fivefold,
we explicitly derive the associated Picard-Fuchs differential equations and
compute the quantum corrections in terms of the open and closed flat
coordinates. Implications for a kind of open-closed duality are also discussed.Comment: 46 pages, 6 figures. v2: minor correction
Disformally self-tuning gravity

We extend a previous self-tuning analysis of the most general scalar-tensor
theory of gravity in four dimensions with second order field equations by
considering a generalized coupling to the matter sector. Through allowing a
disformal coupling to matter we are able to extend the Fab Four model and
construct a new class of theories that are able to tune away the cosmological
constant on Friedmann-Lemaitre-Robertson-Walker backgrounds.Comment: 36 pages. Prepared for publication in JHEP. Additional section
  included detailing analysis of a specific example in the case of the most
  general disformal self-tuning coupling to the matter sector. Minor edits made
  to main body of tex
The Covariant Chiral Ring

We construct a covariant generating function for the spectrum of chiral
primaries of symmetric orbifold conformal field theories with N=(4,4)
supersymmetry in two dimensions. For seed target spaces K3 and T4, the
generating functions capture the SO(21) and SO(5) representation theoretic
content of the chiral ring respectively. Via string dualities, we relate the
transformation properties of the chiral ring under these isometries of the
moduli space to the Lorentz covariance of perturbative string partition
functions in flat space.Comment: 19 page
Phase diagram of 4D field theories with chiral anomaly from holography

Within gauge/gravity duality, we study the class of four dimensional CFTs
with chiral anomaly described by Einstein-Maxwell-Chern-Simons theory in five
dimensions. In particular we determine the phase diagram at finite temperature,
chemical potential and magnetic field. At high temperatures the solution is
given by an electrically and magnetically charged AdS Reissner-Nordstroem black
brane. For sufficiently large Chern-Simons coupling and at sufficiently low
temperatures and small magnetic fields, we find a new phase with helical order,
breaking translational invariance spontaneously. For the Chern-Simons couplings
studied, the phase transition is second order with mean field exponents. Since
the entropy density vanishes in the limit of zero temperature we are confident
that this is the true ground state which is the holographic version of a chiral
magnetic spiral.Comment: 42 pages, 16 figures. Match published versio
Interactions as conformal intertwiners in 4D QFT

In a recent paper we showed that the correlators of free scalar field theory
in four dimensions can be constructed from a two dimensional topological field
theory based on so(4,2) equivariant maps (intertwiners). The free field result,
along with results of Frenkel and Libine on equivariance properties of Feynman
integrals, are developed further in this paper. We show that the coefficient of
the log term in the 1-loop 4-point conformal integral is a projector in the
tensor product of so(4,2) representations. We also show that the 1-loop 4-point
integral can be written as a sum of four terms, each associated with the
quantum equation of motion for one of the four external legs. The quantum
equation of motion is shown to be related to equivariant maps involving
indecomposable representations of so(4,2), a phenomenon which illuminates
multiplet recombination. The harmonic expansion method for Feynman integrals is
a powerful tool for arriving at these results. The generalization to other
interactions and higher loops is discussed.Comment: 42 pages, 3 figure
New modes from higher curvature corrections in holography

In gravitational theories involving higher curvature corrections the metric
describes additional degrees of freedom beyond the graviton. Holographic
duality maps these to operators in the dual CFT. We identify infinite families
of theories for which these new modes cannot be truncated and the usual
Fefferman-Graham expansion needs to be modified. New massive gravity in three
dimensions and critical gravity in four dimensions are particular
representatives of these families. We propose modified expansion, study the
near-boundary behaviour of the metric and derive fall-off properties of the
additional modes in theories involving higher derivative corrections.Comment: 24 page
Rapidity renormalized TMD soft and beam functions at two loops

We compute the transverse momentum dependent (TMD) soft function for the
production of a color-neutral final state at the LHC within the rapidity
renormalization group (RRG) framework to next-to-next-to-leading order (NNLO).
We use this result to extract the universal renormalized TMD beam functions
(aka TMDPDFs) in the same scheme and at the same order from known results in
another scheme. We derive recurrence relations for the logarithmic structure of
the soft and beam functions, which we use to cross check our calculation. We
also explicitly confirm the non-Abelian exponentiation of the TMD soft function
in the RRG framework at two loops. Our results provide the ingredients for
resummed predictions of pT-differential cross sections at NNLL' in the RRG
formalism. The RRG provides a systematic framework to resum large (rapidity)
logarithms through (R)RG evolution and to assess the associated perturbative
uncertainties.Comment: 37 pages, 3 figures; v2: journal version; v3: typos in eq.(6.19)
  correcte
New Supersymmetric Localizations from Topological Gravity

Supersymmetric field theories can be studied exactly on suitable off-shell
supergravity backgrounds. We show that in two dimensions such backgrounds are
identifiable with BRST invariant backgrounds of topological gravity coupled to
an abelian topological gauge multiplet. This latter background is required for
the consistent coupling of the topological `matter' YM theory to topological
gravity. We make use of this topological point of view to obtain, in a simple
and straightforward way, a complete classification of localizing supersymmetric
backgrounds in two dimensions. The BRST invariant topological backgrounds are
parametrized by both Killing vectors and $S^1$-equivariant cohomology of the
2-dimensional world-sheet. We reconstruct completely the supergravity
backgrounds from the topological data: some of the supergravity fields are
twisted versions of the topological backgrounds, but others are "composite",
i.e. they are non-linear functionals of them. We recover all the known
localizing 2-dimensional backgrounds and (infinitely) many more that have not
been explored so far. We show that the supersymmetric $\Omega$-deformation is
nothing but the background value of the ghost-for-ghost of topological gravity,
a result which holds for other dimensions too. The new localizing backgrounds
are characterized by non-trivial fluxes for both the graviphotons of the
supergravity multiplet.Comment: 45 pages, 2 figures, revised introduction, version published on JHE
Entropy production, viscosity bounds and bumpy black holes

The ratio of shear viscosity to entropy density, $\eta/s$, is computed in
various holographic geometries that break translation invariance (but are
isotropic). The shear viscosity does not have a hydrodynamic interpretation in
such backgrounds, but does quantify the rate of entropy production due to a
strain. Fluctuations of the metric components $\delta g_{xy}$ are massive about
these backgrounds, leading to $\eta/s < 1/(4\pi)$ at all finite temperatures
(even in Einstein gravity). As the temperature is taken to zero, different
behaviors are possible. If translation symmetry breaking is irrelevant in the
far IR, then $\eta/s$ tends to a constant at $T=0$. This constant can be
parametrically small. If the translation symmetry is broken in the far IR
(which nonetheless develops emergent scale invariance), then $\eta/s \sim T^{2
\nu}$ as $T \to 0$, with $\nu \leq 1$ in all cases we have considered. While
these results violate simple bounds on $\eta/s$, we note that they are
consistent with a possible bound on the rate of entropy production due to
strain.Comment: 1 + 22 pages + appendices. 7 figures. v2 references adde
Precision Diboson Observables for the LHC

Motivated by the restoration of $SU(2)\times U(1)$ at high energy, we suggest
that certain ratios of diboson differential cross sections can be used as
high-precision observables at the LHC. We rewrite leading-order diboson
partonic cross sections in a form that makes their $SU(2)\times U(1)$ and
custodial $SU(2)$ structure more explicit than in previous literature, and
identify important aspects of this structure that survive even in hadronic
cross sections. We then focus on higher-order corrections to ratios of
$\gamma\gamma$, $Z\gamma$ and $ZZ$ processes, including full
next-to-leading-order corrections and $gg$ initial-state contributions, and
argue that these ratios can likely be predicted to better than $5\%$, which
should make them useful in searches for new phenomena. The ratio of $Z\gamma$
to $\gamma\gamma$ is especially promising in the near term, due to large rates
and to exceptional cancellations of QCD-related uncertainties. We argue that
electroweak corrections are moderate in size, have small uncertainties, and can
potentially be observed in these ratios in the long run.Comment: v2, 55 pages, 16 figures, improved discussion of EW correction
Holographic entanglement entropy for massive flavours in dS_4

We examine the holographic entanglement entropy of spherical regions in de
Sitter space in the presence of massive flavour fields which are modelled by
probe D7 branes in AdS_5xS^5. We focus on the finite part of the massive
correction to the entropy in the limits of small mass and large mass that are
separated by a phase transition between two topologically distinct brane
embeddings. For small masses, it approaches the flat space result for small
spheres, whereas for large spheres there is a term that goes as the log of the
sphere radius. For large masses, we find evidence for a universal contribution
logarithmic in the mass. In all cases the entanglement entropy is smooth as the
sphere radius crosses the horizon.Comment: 36 pages, 8 figures. Minor corrections. Clarifications about lack of
  transition in EE as sphere size crosses horizon. Version published in JHE
The Family Problem: Hints from Heterotic Line Bundle Models

Within the class of heterotic line bundle models, we argue that N=1 vacua
which lead to a small number of low-energy chiral families are preferred. By
imposing an upper limit on the volume of the internal manifold, as required in
order to obtain finite values of the four-dimensional gauge couplings, and
validity of the supergravity approximation we show that, for a given manifold,
only a finite number of line bundle sums are consistent with supersymmetry. By
explicitly scanning over this finite set of line bundle models on certain
manifolds we show that, for a sufficiently small volume of the internal
manifold, the family number distribution peaks at small values, consistent with
three chiral families. The relation between the maximal number of families and
the gauge coupling is discussed, which hints towards a possible explanation of
the family problem.Comment: 16 pages Late