pinecone/core-2020-05-10-deduplication huggingface dataset:
Constraining the Higgs portal with antiprotons

The scalar Higgs portal is a compelling model of dark matter (DM) in which a renormalizable coupling with the Higgs boson provides the connection between the visible world and the dark sector. In this paper we investigate the constraint placed on the parameter space of this model by the antiproton data. Due to the fact that the antiproton- to-proton ratio has relative less systematic uncertainties than the antiproton absolute flux, we propose and explore the possibility to combine all the available p ¯ / p $$ \overline{p}/p $$ data. Following this approach, we are able to obtain stronger limits if compared with the existing literature. In particular, we show that most of the parameter space close to the Higgs resonance is ruled out by our analysis. Furthermore, by studying the reach of the future AMS-02 antiproton and antideuteron data, we argue that a DM mass of O(150) GeV offers a promising discovery potential. The method of combining all the antiproton-to-proton ratio data proposed in this paper is quite general, and can be straightforwardly applied to other models
From U(1) to E 8 : soft theorems in supergravity amplitudes

It is known that for N = 8 $$ \mathcal{N}=8 $$ supergravity, the double-soft-scalar limit of a n -point amplitude is given by a sum of local SU(8) rotations acting on a ( n −2)-point amplitude. For N < 8 $$ \mathcal{N}<8 $$ supergravity theories, complication arises due to the presence of a U(1) in the U( N $$ \mathcal{N} $$ ) isotropy group, which introduces a soft-graviton singularity that obscures the action of the duality symmetry. In this paper, we introduce an anti-symmetrised extraction procedure that exposes the full duality group. We illustrate this procedure for tree-level amplitudes in 4 ≤ N < 8 $$ \mathcal{N}<8 $$ supergravity in four dimensions, as well as N = 16 $$ \mathcal{N}=16 $$ supergravity in three dimensions. In three dimensions, as all bosonic degrees of freedom transform under the E 8 duality group, supersymmetry ensures that the amplitude vanishes in the single-soft limit of all particle species, in contrast to its higher dimensional siblings. Using recursive formulas and generalized unitarity cuts in three dimensions, we demonstrate the action of the duality group for any tree-level and one-loop amplitudes. Finally we discuss the implications of the duality symmetry on possible counter terms for this theory. As a preliminary application, we show that the vanishing of single-soft limits of arbitrary component fields in three-dimensional supergravity rules out the direct dimensional reduction of D 8 R 4 as a valid counter term
Search for new physics via photon polarization of $b \rightarrow s
  \gamma$

We suggest a discriminant analysis of new physics beyond the standard model
through a detection of photon polarization in a radiative B meson decay. This
analysis is investigated in SUSY SU(5) GUT with right-handed neutrino and
left-right symmetric models. New physics search via CP asymmetry in the same
process are also evaluated in each model for comparison. We show that new
physics can be found via detecting the photon polarization in a parameter space
of TeV energy scale.Comment: 20 pages, 8 figures, v2:references added, v3:published versio
Thermodynamics of AdS black holes in Einstein-Scalar gravity

We study the thermodynamics of n -dimensional static asymptotically AdS black holes in Einstein gravity coupled to a scalar field with a potential admitting a stationary point with an AdS vacuum. Such black holes with non-trivial scalar hair can exist provided that the mass-squared of the scalar field is negative, and above the Breitenlohner-Freedman bound. We use the Wald procedure to derive the first law of thermodynamics for these black holes, showing how the scalar hair (or “charge”) contributes non-trivially in the expression. We show in general that a black hole mass can be deduced by isolating an integrable contribution to the (non-integrable) variation of the Hamiltonian arising in the Wald construction, and that this is consistent with the mass calculated using the renormalised holographic stress tensor and also, in those cases where it is defined, with the mass calculated using the conformal method of Ashtekar, Magnon and Das. Similar arguments can also be given for the smooth solitonic solutions in these theories. Neither the black hole nor the soliton solutions can be constructed explicitly, and we carry out a numerical analysis to demonstrate their existence and to provide approximate checks on some of our thermodynamic results
Entanglement and RG in the $O(N)$ vector model

We consider the large $N$ interacting vector $O(N)$ model on a sphere in
$4-\epsilon$ Euclidean dimensions. The Gaussian theory in the UV is taken to be
either conformally or non-conformally coupled. The endpoint of the RG flow
corresponds to a conformally coupled scalar field at the Wilson-Fisher fixed
point. We take a spherical entangling surface in de Sitter space and compute
the entanglement entropy everywhere along the RG trajectory. In $4$ dimensions,
a free non-conformal scalar has a universal area term scaling with the
logarithm of the UV cutoff. In $4-\epsilon$ dimensions, such a term scales as
$1/\epsilon$. For a non-conformal scalar, a $1/\epsilon$ term is present both
at the UV fixed point, and its vicinity. For flow between two conformal fixed
points, $1/\epsilon$ terms are absent everywhere. Finally, we make contact with
replica trick calculations. The conical singularity gives rise to boundary
terms residing on the entangling surface, which are usually discarded.
Consistency with our results requires they be kept. We argue that, in fact,
this conclusion also follows from the work of Metlitski, Fuertes, and Sachdev,
which demonstrated that such boundary terms will be generated through quantum
corrections.Comment: 27 pages, 3 figure
Long-Lived, Colour-Triplet Scalars from Unnaturalness

Long-lived, colour-triplet scalars are a generic prediction of unnatural, or
split, composite Higgs models where the spontaneous global-symmetry breaking
scale $f \gtrsim 10$ TeV and an unbroken $SU(5)$ symmetry is preserved. Since
the triplet scalars are pseudo Nambu-Goldstone bosons they are split from the
much heavier composite-sector resonances and are the lightest exotic, coloured
states. This makes them ideal to search for at colliders. Due to discrete
symmetries the triplet scalar decays via a dimension-six term and given the
large suppression scale $f$ is often metastable. We show that existing searches
for collider-stable R-hadrons from Run-I at the LHC forbid a triplet scalar
mass below 845 GeV, whereas with $300\,\mathrm{fb}^{-1}$ at 13 TeV triplet
scalar masses up to 1.4 TeV can be discovered. For shorter lifetimes
displaced-vertex searches provide a discovery reach of up to 1.8 TeV. In
addition we present exclusion and discovery reaches of future hadron colliders
as well as indirect limits that arise from modifications of the Higgs
couplings.Comment: 29 pages, 8 figures; v2: version published in JHE
Sequencing BPS Spectra

This paper provides both a detailed study of color-dependence of link
homologies, as realized in physics as certain spaces of BPS states, and a broad
study of the behavior of BPS states in general. We consider how the spectrum of
BPS states varies as continuous parameters of a theory are perturbed. This
question can be posed in a wide variety of physical contexts, and we answer it
by proposing that the relationship between unperturbed and perturbed BPS
spectra is described by a spectral sequence. These general considerations unify
previous applications of spectral sequence techniques to physics, and explain
from a physical standpoint the appearance of many spectral sequences relating
various link homology theories to one another. We also study structural
properties of colored HOMFLY homology for links and evaluate Poincare
polynomials in numerous examples. Among these structural properties is a novel
"sliding" property, which can be explained by using (refined) modular S-matrix.
This leads to the identification of modular transformations in Chern-Simons
theory and 3d N=2 theory via the 3d/3d correspondence. Lastly, we introduce the
notion of associated varieties as classical limits of recursion relations of
colored superpolynomials of links, and study their properties.Comment: 160 pages, 69 figures, 4 tables; Don't be intimidated by the length -
  each section can be read more or less independently.; v2 and v3, minor
  corrections, a Mathematica file is attached as an ancillary fil
LHC signatures of a Z' mediator between dark matter and the SU(3) sector

In this paper, we study the experimental signatures of a gluophilic $Z'$ at
the LHC, in particular through the analysis of three jets or four tops events.
The $Z'$ couples to gluons through dimension six operators and the parameter
space is constrained with experimental searches released at 7 and 8
$\mathrm{TeV}$ by CMS along these two different channels. Existing constraints
coming from the study of dark matter where the $Z'$ represents a possible
mediator between the latter and the Standard Model are also included for
comparison. Prospects at $\sqrt s=13$ TeV allow us to evaluate for which values
of the parameter space a gluophilic $Z'$ could be discovered during the next
run of the LHC. In particular, we show that the analysis of the three jets
invariant mass could provide a clear signal ($>5\sigma$) for masses of the $Z'$
above 300 $\mathrm{GeV}$. Four tops events bring in addition further discovery
potential for heavy $Z'$ (above $\sim 2~\mathrm{TeV}$). A combination of both
signals in four top channels and three jets analyses during the next run of the
LHC could thus provide a clear signal of the presence of a heavy gluophilic
$Z'$.Comment: 17 pages, 6 figure
Exploring the Higgs sector of the MRSSM with a light scalar

In a recent paper we showed that the Minimal R-symmetric Supersymmetric
Standard Model (MRSSM) can accommodate the observed 125 GeV Higgs boson as the
lightest scalar of the model in agreement with electroweak precision
observables, in particular with the W boson mass and $T$ parameter. Here we
explore a scenario with the light singlet (and bino-singlino) state in which
the second-lightest scalar takes the role of the SM-like boson with mass close
to 125 GeV. In such a case the second-lightest Higgs state gets pushed up via
mixing already at tree-level and thereby reducing the required loop correction.
Unlike in the NMSSM, the light singlet is necessarily connected with a light
neutralino which naturally appears as a promising dark matter candidate. We
show that dark matter and LHC searches place further bounds on this scenario
and point out parameter regions, which are viable and of interest for LHC Run
II and upcoming dark matter experiments.Comment: 31 pages, updated for submissio
Orientifolding of the ABJ Fermi gas

The grand partition functions of ABJ theory can be factorized into even and
odd parts under the reflection of fermion coordinate in the Fermi gas approach.
In some cases, the even/odd part of ABJ grand partition function is equal to
that of $\mathcal{N}=5$ $O(n)\times USp(n')$ theory, hence it is natural to
think of the even/odd projection of grand partition function as an
orientifolding of ABJ Fermi gas system. By a systematic WKB analysis, we
determine the coefficients in the perturbative part of grand potential of such
orientifold ABJ theory. We also find the exact form of the first few
"half-instanton" corrections coming from the twisted sector of the reflection
of fermion coordinate. For the Chern-Simons level $k=2,4,8$ we find closed form
expressions of the grand partition functions of orientifold ABJ theory, and for
$k=2,4$ we prove the functional relations among the grand partition functions
conjectured in arXiv:1410.7658.Comment: 71 pages, 2 figures, 38 ancillary files; v2: typos corrected; v3: new
  results in section 6. footnote 5 adde
A constrained supersymmetric left-right model

We present a supersymmetric left-right model which predicts gauge coupling
unification close to the string scale and extra vector bosons at the TeV scale.
The subtleties in constructing a model which is in agreement with the measured
quark masses and mixing for such a low left-right breaking scale are discussed.
It is shown that in the constrained version of this model radiative breaking of
the gauge symmetries is possible and a SM-like Higgs is obtained. Additional
CP-even scalars of a similar mass or even much lighter are possible. The
expected mass hierarchies for the supersymmetric states differ clearly from
those of the constrained MSSM. In particular, the lightest down-type squark,
which is a mixture of the sbottom and extra vector-like states, is always
lighter than the stop. We also comment on the model's capability to explain
current anomalies observed at the LHC.Comment: 21 pages, 5 figures; v2: references added, matches published versio
$\varepsilon'/\varepsilon$ in 331 Models

Motivated by the recent findings that the ratio $\varepsilon'/\varepsilon$ in
the Standard Model (SM) appears to be significantly below the data we
investigate whether the necessary enhancement of this ratio can be obtained in
331 models, in which new physics (NP) contributions to
$\varepsilon'/\varepsilon$ and other flavour observables are dominated by
tree-level exchanges of a $Z^\prime$. NP contributions to
$\varepsilon'/\varepsilon$ in these models are governed by the electroweak
operator $Q_8$ for which the hadronic matrix element is rather well known so
that our analysis of NP contributions is subject to much smaller uncertainties
than within the SM. We consider seven 331 models selected in our earlier
analysis on the basis of electroweak precision data. Imposing the constraints
from $\Delta F=2$ transitions we find that only three of these models can
provide a significant positive shift in $\varepsilon'/\varepsilon$ up to
$6\times 10^{-4}$ for $M_{Z^\prime}=3$ TeV. Two of them allow simultaneously a
supression of ${\cal B}(B_{s}\to \mu^+\mu^-)$ by $20\%$, bringing the theory
closer to the data without any significant impact on the Wilson coefficient
$C_9$. The third one provides also the shift $\Delta C_9=-0.6$, softening the
anomalies in $B\to K^*\mu^+\mu^-$, without any significant impact on $B_{s}\to
\mu^+\mu^-$. NP effects in rare $K$ decays and in $B\to K(K^*)\nu\bar\nu$ turn
out to be small. The flavour structure of 331 models implies that even for
$M_{Z^\prime}=30$ Tev a shift of $\varepsilon'/\varepsilon$ up to $8\times
10^{-4}$ and a significant shift in $\varepsilon_K$ can be obtained, while the
effects in other flavour observables are small.Comment: LaTeX, 22 pages, 8 figures. Matches version in JHE
Flooded Dark Matter and S Level Rise

Most dark matter (DM) models set the DM relic density by some interaction
with Standard Model particles. Such models generally assume the existence of
Standard Model particles early on, with the DM relic density a later
consequence of those interactions. Perhaps a more compelling assumption is that
DM is not part of the Standard Model sector and a population of DM too is
generated at the end of inflation. This democratic assumption does not
necessarily provide a natural value for the DM relic density, and superficially
leads to too much entropy in the dark sector. We address the latter issue by
the late decay of heavy particles produced at early times, associating the DM
relic density with the lifetime of a long-lived state. We ask what it would
take for this scenario to be compatible with observations in what we call
Flooded Dark Matter (FDM) and discuss several interesting consequences. One is
that DM can be very light and furthermore, light DM is in some sense the most
natural scenario in FDM as it is compatible with larger couplings of the
decaying particle. Moreover, the decay of the field with the smallest coupling
and hence the longest lifetime dominates the entropy and possibly the matter
content of the Universe, a principle we refer to as 'Maximum Baroqueness'. We
also show that the dark sector should be colder than the ordinary sector,
relaxing the free-streaming constraints on light DM. We will discuss the
implications for the core-cusp problem in a follow-up paper. FDM also has
interesting baryogenesis implications. One possibility is that both DM and
baryon asymmetries are simultaneously diluted by a late entropy dump.
Alternatively, FDM is compatible with an elegant non-thermal leptogenesis
implementation in which decays of a heavy RH neutrino lead to late time
reheating of the Standard Model and provide suitable conditions for creation of
a lepton asymmetry.Comment: 25 pages, 5 figure
Analytic pseudo-Goldstone bosons

We consider the interplay between explicit and spontaneous symmetry breaking
in strongly coupled field theories. Some well-known statements, such as the
Gell-Mann-Oakes-Renner relation, descend directly from the Ward identities and
have thus a general relevance. Such Ward identities are recovered in
gauge/gravity dual setups through holographic renormalization. In a simple
paradigmatic three dimensional toy-model, we find analytic expressions for the
two-point correlators which match all the quantum field theoretical
expectations. Moreover, we have access to the full spectrum, which is
reminiscent of linear confinement.Comment: 20 pages, 4 figures, v2 minor correction
Towards the Amplituhedron Volume

It has been recently conjectured that scattering amplitudes in planar N=4
super Yang-Mills are given by the volume of the (dual) amplituhedron. In this
paper we show some interesting connections between the tree-level amplituhedron
and a special class of differential equations. In particular we demonstrate how
the amplituhedron volume for NMHV amplitudes is determined by these
differential equations. The new formulation allows for a straightforward
geometric description, without any reference to triangulations. Finally we
discuss possible implications for volumes related to generic N^kMHV amplitudes.Comment: 21 pages; v2: version published in JHE
On the Entanglement Between Interacting Scalar Field Theories

We study "field space entanglement" in certain quantum field theories
consisting of N number of free scalar fields interacting with each other via
kinetic mixing terms. We present exact analytic expressions for entanglement
end Renyi entropies between arbitrary number of scalar fields by which we could
explore certain entanglement inequalities. Other entanglement measures such as
mutual information and entanglement negativity have also been studied. We also
give some comments about possible holographic realizations of such models.Comment: 33 pages, 16 figures. v2: a reference added, Appendix section
  improved. v3: a reference corrected, matches published version in JHE
Non-Standard Interactions in propagation at the Deep Underground
  Neutrino Experiment

We study the sensitivity of current and future long-baseline neutrino
oscillation experiments to the effects of dimension six operators affecting
neutrino propagation through Earth, commonly referred to as Non-Standard
Interactions (NSI). All relevant parameters entering the oscillation
probabilities (standard and non-standard) are considered at once, in order to
take into account possible cancellations and degeneracies between them. We find
that the Deep Underground Neutrino Experiment will significantly improve over
current constraints for most NSI parameters. Most notably, it will be able to
rule out the so-called LMA-dark solution, still compatible with current
oscillation data, and will be sensitive to off-diagonal NSI parameters at the
level of $\varepsilon \sim \mathcal{O}(0.05 - 0.5)$. We also identify two
degeneracies among standard and non-standard parameters, which could be
partially resolved by combining T2HK and DUNE data.Comment: 26 pages, 8 figures. v2: Major changes due to the inclusion of prior
  constraints on NSI coming from global fits of oscillation data, matches the
  version accepted for publication in JHEP. v3: references added and typos
  correcte
750 GeV Diphotons: Implications for Supersymmetric Unification

A recent signal of 750 GeV diphotons at the LHC can be explained within the
framework of supersymmetric unification by the introduction of vector quarks
and leptons with Yukawa couplings to a singlet S that describes the 750 GeV
resonance. We study the most general set of theories that allow successful
gauge coupling unification, and find that these Yukawa couplings are severely
constrained by renormalization group behavior: they are independent of
ultraviolet physics and flow to values at the TeV scale that we calculate
precisely. As a consequence the vector quarks and leptons must be light;
typically in the region of 375 GeV to 700 GeV, and in certain cases up to 1
TeV. The 750 GeV resonance may have a width less than the experimental
resolution; alternatively, with the mass splitting between scalar and
pseudoscalar components of S arising from one-loop diagrams involving vector
fermions, we compute an apparent width of 10s of GeV.Comment: 10 pages, 6 figures; to appear in JHE
Hunting for neutral, long-lived exotica at the LHC using a missing
  transverse energy signature

Searches at the Large Hadron Collider (LHC) for neutral, long-lived particles
have historically relied on the detection of displaced particles produced by
their decay $\textit{within}$ the detector volume. In this paper we study the
potential of the complementary signature comprising of the missing transverse
energy ($E_T^{miss}$) signal, traditionally used to look for dark matter, e.g.,
the lightest supersymmetric particle (LSP), to extend the LHC coverage to
models with long-lived (LL) particles when they decay $\textit{outside}$ the
detector. Using CMS and ATLAS analyses at the 8 TeV LHC, we set an upper limit
at the 95% confidence level (CL) on the production cross sections for two
specific scenarios: (i) a model with a heavy non-standard model Higgs boson
decaying to a LL scalar and (ii) an R-parity violating RPV SUSY model with a LL
neutralino.
  We show that this method can significantly extend the LHC sensitivity to
neutral, LL particles with arbitrary large lifetimes and that the limits
obtained from a $E_T^{miss}$ signal are comparable to those from displaced
particle searches for decay distances above a few meters. Results obtained in
this study do not not depend on the specific decay channel of the LL particle
and therefore are model-independent in this sense. We provide limits for the
whole two-dimensional plane in terms of the mass of the LL particle and the
mass of the mediator up to masses of 2 TeV including particular benchmarks
studied in the original experimental papers. We have made these limits
available in the form of a grid which can be used for the interpretation of
various other new physics models.Comment: 28 page
On Unification of Gravity and Gauge Interactions

Considering a higher dimensional Lorentz group as the tangent symmetry, we
unify gravity and gauge interactions in a natural way. The spin connection of
the gauged Lorentz group is then responsible for both gravity and gauge fields,
and the action for the gauged fields becomes part of the spin curvature
squared. The realistic group which unifies all known particles and interactions
is the $SO(1,13)$ Lorentz group whose gauge part leads to $SO(10)$ grand
unified theory and contains double the number of required fermions in the
fundamental spinor representation. Mirror fermions could acquire mass utilizing
a mechanism employed for topological superconductors. Family unification could
be achieved by considering the $SO(1,21)$ Lorentz group.Comment: 17 pages. Mirror fermions now acquire masses utilizing a mechanism
  employed for topological superconductor