pinecone/core-2020-05-10-deduplication huggingface dataset:
A 750 GeV Portal: LHC Phenomenology and Dark Matter Candidates

We study the effective field theory obtained by extending the Standard Model
field content with two singlets: a 750 GeV (pseudo-)scalar and a stable
fermion. Accounting for collider productions initiated by both gluon and photon
fusion, we investigate where the theory is consistent with both the LHC
diphoton excess and bounds from Run 1. We analyze dark matter phenomenology in
such regions, including relic density constraints as well as collider, direct,
and indirect bounds. Scalar portal dark matter models are very close to limits
from direct detection and mono-jet searches if gluon fusion dominates, and not
constrained at all otherwise. Pseudo-scalar models are challenged by photon
line limits and mono-jet searches in most of the parameter space.Comment: 25 pages + appendices, 8+1 figures. v2: relic density computation and
  mono-jet analysis improved; some clarifications and references added;
  conclusions unchanged. v3: version published in JHE
Extending the scope of holographic mutual information and chaotic
  behavior

We extend the use of holography to investigate the scrambling properties of
various physical systems. Specifically, we consider: (i) non-conformal
backgrounds of black $Dp$ branes, (ii) asymptotically Lifshitz black holes, and
(iii) black $AdS$ solutions of Gauss-Bonnet gravity. We use the disruption of
the entanglement entropy as a probe of the chaotic features of such systems.
Our analysis shows that these theories share the same type of behavior as
conformal theories as they undergo chaos; however, in the case of Gauss-Bonnet
gravity, we find a stark difference in the evolution of the mutual information
for negative Gauss-Bonnet coupling. This may signal an inconsistency of the
latter.Comment: 34 pages; minor correction, references added. Version accepted to
  JHE
Resonances from QCD bound states and the 750 GeV diphoton excess

Pair production of colored particles is in general accompanied by production
of QCD bound states (onia) slightly below the pair-production threshold. Bound
state annihilation leads to resonant signals, which in some cases are easier to
see than the decays of the pair-produced constituents. In a previous paper
(arXiv:1204.1119) we estimated the bound state signals, at leading order and in
the Coulomb approximation, for particles with various spins, color
representations and electric charges, and used 7 TeV ATLAS and CMS resonance
searches to set rough limits. Here we update our results to include 8 and 13
TeV data. We find that the recently reported diphoton excesses near 750 GeV
could indeed be due to a bound state of this kind. A narrow resonance of the
correct size could be obtained for a color-triplet scalar with electric charge
-4/3 and mass near 375 GeV, if (as a recent lattice computation suggests) the
wave function at the origin is somewhat larger than anticipated. Pair
production of this particle could have evaded detection up to now. Other
candidates may include a triplet scalar of charge 5/3, a triplet fermion of
charge -4/3, and perhaps a sextet scalar of charge -2/3.Comment: 22 pages, 5 figures; v2: included additional searches in figure 5;
  published version; v3: corrected a factor-of-2 error, originally from
  arXiv:1204.1119, in the photon+jet signa
Enhanced Charged Higgs Production through W-Higgs Fusion in W-b
  Scattering

We study the associated production of a charged Higgs boson with a bottom
quark and a light quark at the LHC via p p \to H^\pm\,b\,j in the Two Higgs
Doublet Models (2HDMs). Using the effective W approximation, we show that there
is exact cancellation among various Feynman diagrams in high energy limit. This
may imply that the production of charged Higgs can be significantly enhanced in
the presence of large mass differences among the neutral Higgs bosons via
W^\pm-Higgs fusion in the p p \to H^\pm\,b\,j process. Particularly, we
emphasize the potential enhancement due to a light pseudoscalar boson $A$,
which is still allowed by the current data by which we explicitly calculate the
allowed regions in (M_A,\,\tan\beta) plane, and show that the production cross
section can be as large as 0.1 pb for large $\tan\beta$. We also show that the
transverse momentum distribution of the b quark can potentially distinguish the
W^\pm-A fusion diagram from the top diagram. Finally, we point out further
enhancement when we go beyond the 2HDMs.Comment: 25 pages, 9 pdf figures, Matches the published JHEP versio
Long, partial-short, and special conformal fields

In the framework of metric-like approach, totally symmetric arbitrary spin
bosonic conformal fields propagating in flat space-time are studied. Depending
on the values of conformal dimension, spin, and dimension of space-time, we
classify all conformal field as long, partial-short, short, and special
conformal fields. An ordinary-derivative (second-derivative) Lagrangian
formulation for such conformal fields is obtained. The ordinary-derivative
Lagrangian formulation is realized by using double-traceless gauge fields,
Stueckelberg fields, and auxiliary fields. Gauge-fixed Lagrangian invariant
under global BRST transformations is obtained. The gauge-fixed BRST Lagrangian
is used for the computation of partition functions for all conformal fields.
Using the result for the partition functions, numbers of propagating D.o.F for
the conformal fields are also found.Comment: LaTeX-2e, 30 pages v2: Typos in eqs. (5.23), (5.24), (7.25) (7.49)
  correcte
The covariant action of higher spin black holes in three dimensions

We propose a set of boundary terms for higher spin theories in AdS$_3$ that
lead to a well-defined variational principle compatible with Dirichlet boundary
conditions for the metric and higher spin fields. These boundary terms are
valid for higher spin theories in the Fefferman-Graham gauge and they allow us
to compute the canonical free energy of higher spin black holes directly from
the Euclidean, covariant, on-shell action. Using these results we reproduce the
thermodynamics of the higher spin black hole of Ammon, Gutperle, Kraus, and
Perlmutter and comment on the corresponding theory of induced $\cal{W}$-gravity
at the boundary.Comment: 20 pages; v2: clarified the origin of the boundary term at the
  horizon, matches published versio
On the evolution of jet energy and opening angle in strongly coupled plasma

We calculate how the energy and the opening angle of jets in  N = 4 SYM theory evolve as they propagate through the strongly coupled plasma of that theory. We define the rate of energy loss dE[subscript jet]/dx and the jet opening angle in a straightforward fashion directly in the gauge theory before calculating both holographically, in the dual gravitational description. In this way, we rederive the previously known result for dE[subscript jet]/dx without the need to introduce a finite slab of plasma. We obtain a striking relationship between the initial opening angle of the jet, which is to say the opening angle that it would have had if it had found itself in vacuum instead of in plasma, and the thermalization distance of the jet. Via this relationship, we show that  N = 4 SYM jets with any initial energy that have the same initial opening angle and the same trajectory through the plasma experience the same fractional energy loss. We also provide an expansion that describes how the opening angle of the  N = 4 SYM jets increases slowly as they lose energy, over the fraction of their lifetime when their fractional energy loss is not yet large. We close by looking ahead toward potential qualitative lessons from our results for QCD jets produced in heavy collisions and propagating through quark-gluon plasma.United States. Dept. of Energy ( Contract Number DE-SC0011090
Causality Constraints in Conformal Field Theory

Causality places nontrivial constraints on QFT in Lorentzian signature, for
example fixing the signs of certain terms in the low energy Lagrangian. In
d-dimensional conformal field theory, we show how such constraints are encoded
in crossing symmetry of Euclidean correlators, and derive analogous constraints
directly from the conformal bootstrap (analytically). The bootstrap setup is a
Lorentzian four-point function corresponding to propagation through a
shockwave. Crossing symmetry fixes the signs of certain log terms that appear
in the conformal block expansion, which constrains the interactions of
low-lying operators. As an application, we use the bootstrap to rederive the
well known sign constraint on the $(\partial\phi)^4$ coupling in effective
field theory, from a dual CFT. We also find constraints on theories with higher
spin conserved currents. Our analysis is restricted to scalar correlators, but
we argue that similar methods should also impose nontrivial constraints on the
interactions of spinning operators.Comment: 52 pages; minor changes, conclusions unchange
Anomaly Cancelation in Field Theory and F-theory on a Circle

We study the manifestation of local gauge anomalies of four- and
six-dimensional field theories in the lower-dimensional Kaluza-Klein theory
obtained after circle compactification. We identify a convenient set of
transformations acting on the whole tower of massless and massive states and
investigate their action on the low-energy effective theories in the Coulomb
branch. The maps employ higher-dimensional large gauge transformations and
precisely yield the anomaly cancelation conditions when acting on the one-loop
induced Chern-Simons terms in the three- and five-dimensional effective theory.
The arising symmetries are argued to play a key role in the study of the
M-theory to F-theory limit on Calabi-Yau manifolds. For example, using the fact
that all fully resolved F-theory geometries inducing multiple Abelian gauge
groups or non-Abelian groups admit a certain set of symmetries, we are able to
generally show the cancelation of pure Abelian or pure non-Abelian anomalies in
these models.Comment: 48 pages, 2 figures; v2: typos corrected, comments on circle fluxes
  adde
Composite Accidental Axions

We present several models where the QCD axion arises accidentally. Confining
gauge theories can generate axion candidates whose properties are uniquely
determined by the quantum numbers of the new fermions under the Standard Model.
The Peccei-Quinn symmetry can emerge accidentally if the gauge theory is
chiral. We generalise previous constructions in a unified framework. In some
cases these models can be understood as the deconstruction of 5-dimensional
gauge theories where the Peccei-Quinn symmetry is protected by locality but
more general constructions are possible.Comment: 24 pages, 3 figure
Anomalous coupling, top-mass and parton-shower effects in $W^+W^−$ production

We calculate the process $pp\to W^+W^-\to e^+ \nu_e \mu^-\bar{\nu}_\mu$ at NLO QCD, including also effective field theory (EFT) operators mediating the $ggW^+W^-$ interaction, which first occur at dimension eight. We further combine the NLO and EFT matrix elements produced by GoSam with the HERWIG7/MATCHBOX framework, which offers the possibility to study the impact of a parton shower. We assess the effects of the anomalous couplings by comparing them to top-mass effects as well as uncertainties related to variations of the renormalisation, factorisation and hard shower scales
Testing ATLAS Z+MET Excess with LHC Run 2

The ATLAS collaboration reported a 3sigma excess in the search of events
containing on-Z dilepton, jets, and large missing momentum (MET) in the 8 TeV
LHC run. Motivated by this excess, many models of new physics have been
proposed. Recently, the ATLAS and CMS collaborations reported new results for
similar Z+MET channels in the 13 TeV run. In this paper, we comprehensively
discuss the consistency between the proposed models and the LHC results of Run
1 and Run 2. We find that in models with heavy gluino production, there is
generically some tension between the 8 TeV and 13 TeV results. On the other
hand, models with light squark production provide relatively better fitting to
both results.Comment: 18 pages, 2 tables, 8 figures. Version accepted for publication in
  JHE
Yangian-type symmetries of non-planar leading singularities.

We take up the study of integrable structures behind non-planar contributions to scattering amplitudes in  N=4N=4  super Yang-Mills theory. Focusing on leading singularities, we derive the action of the Yangian generators on color-ordered subsets of the external states. Each subset corresponds to a single boundary of the non-planar on-shell diagram. While Yangian invariance is broken, we find that higher-level Yangian generators still annihilate the non-planar on-shell diagram. For a given diagram, the number of these generators is governed by the degree of non-planarity. Furthermore, we present additional identities involving integrable transfer matrices. In particular, for diagrams on a cylinder we obtain a conservation rule similar to the Yangian invariance condition of planar on-shell diagrams. To exemplify our results, we consider a five-point MHV on-shell function on a cylinder
Collide and Conquer: Constraints on Simplified Dark Matter Models using
  Mono-X Collider Searches

The use of simplified models as a tool for interpreting dark matter collider
searches has become increasingly prevalent, and while early Run II results are
beginning to appear, we look to see what further information can be extracted
from the Run I dataset. We consider three `standard' simplified models that
couple quarks to fermionic singlet dark matter: an $s$-channel vector mediator
with vector or axial-vector couplings, and a $t$-channel scalar mediator. Upper
limits on the couplings are calculated and compared across three alternate
channels, namely mono-jet, mono-$Z$ (leptonic) and mono-$W/Z$ (hadronic). The
strongest limits are observed in the mono-jet channel, however the
computational simplicity and absence of significant $t$-channel model width
effects in the mono-boson channels make these a straightforward and competitive
alternative. We also include a comparison with relic density and direct
detection constraints.Comment: 32 pages, 8 figures; v2: minor changes, conclusion unchanged, matches
  published versio
Spin-independent interferences and spin-dependent interactions with
  scalar dark matter

We explore mechanisms of interferences under which the spin-independent
interaction in the scattering of scalar dark matter with nucleus is suppressed.
We offer a detailed derivation of the nuclear amplitudes based on the
interactions with quarks in the framework of a nonuniversal $U(1)'$ extension
of the standard model. By assuming a range of parameters compatible with
collider searches, electroweak observables and dark matter abundance, we find
scenarios for destructive interferences with and without isospin symmetry. The
model reveals solutions with mutually interfering scalar particles, canceling
the effective spin-independent coupling with only scalar interactions, which
requires an extra Higgs boson with mass $M_{H}>125$ GeV. The model also
possesses scenarios with only vector interactions through two neutral gauge
bosons, $Z$ and $Z'$. Due to the nonuniversality of the $U(1)'$ symmetry, we
distinguish two family structures of the quark sector with different numerical
predictions. In one case, we obtain cross sections that pass all the
Xenon-based detector experiments. In the other case, limits from LUX experiment
enclose an exclusion region for dark matter between $9$ and $800$ GeV. We
examine a third scenario with isospin-violating couplings where interferences
between scalar and vector boson exchanges cancel the scattering. We provide
solutions where interactions with Xenon-based detectors is suppressed for light
dark matter, below $6$ GeV, while interactions with Germanium- and
Silicon-based detectors exhibit solutions up to the regions of interest for
positive signals reported by CoGeNT and CDMS-Si experiments, and compatible
with the observed DM relic density for DM mass in the range $8.3-10$ GeV.
Spin-dependent interactions become the dominant source of scattering around the
interference regions, where Maxwellian speed distribution is considered.Comment: 47 pages, new figures in the updated versio
Radiating black holes in Einstein-Maxwell-dilaton theory and cosmic censorship violation

We construct exact, time-dependent, black hole solutions of Einstein-Maxwell-dilaton theory with arbitrary dilaton coupling, a. For a = 1 this theory arises as the four-dimensional low-energy effective description of heterotic string theory. These solutions represent electrically charged, spherically symmetric black holes emitting or absorbing charged null fluids and generalize the Vaidya and Bonnor-Vaidya solutions of general relativity and of Einstein-Maxwell theory, respectively. The a = 1 case stands out as special, in the sense that it is the only choice of the coupling that allows for a time-dependent dilaton field in this class of solutions. As a by-product, when a = 1 we show that an electrically charged black hole in this theory can be overcharged by bombarding it with a stream of electrically charged null fluid, resulting in the formation of a naked singularity. This provides an example of cosmic censorship violation in an exact dynamical solution to low-energy effective string theory and in a case in which the total stress-energy tensor satisfies all energy conditions. When a ≠ 1, our solutions necessarily have a time-independent scalar field and consequently cannot be overcharged
Notes on the ambitwistor pure spinor string

In this work, some aspects of the ambitwistor pure spinor string are
investigated. The $b$ ghost is presented and its main properties are derived in
a simple way, very similar to the usual pure spinor $b$ ghost construction. The
heterotic case is also addressed with a new proposal for the BRST charge. The
BRST cohomology is shown to correctly describe the heterotic supergravity
spectrum and a semi-composite $b$ ghost is constructed.Comment: 23 pages, reference and clarifications added, typos fixed. Published
  versio
Analytic boosted boson discrimination

Observables which discriminate boosted topologies from massive QCD jets are of great importance for the success of the jet substructure program at the Large Hadron Collider. Such observables, while both widely and successfully used, have been studied almost exclusively with Monte Carlo simulations. In this paper we present the first all-orders factorization theorem for a two-prong discriminant based on a jet shape variable, D 2, valid for both signal and background jets. Our factorization theorem simultaneously describes the production of both collinear and soft subjets, and we introduce a novel zero-bin procedure to correctly describe the transition region between these limits. By proving an all orders factorization theorem, we enable a systematically improvable description, and allow for precision comparisons between data, Monte Carlo, and first principles QCD calculations for jet substructure observables. Using our factorization theorem, we present numerical results for the discrimination of a boosted Z boson from massive QCD background jets. We compare our results with Monte Carlo predictions which allows for a detailed understanding of the extent to which these generators accurately describe the formation of two-prong QCD jets, and informs their usage in substructure analyses. Our calculation also provides considerable insight into the discrimination power and calculability of jet substructure observables in general.United States. Department of Energy (Contract Numbers DE-SC00012567 and DE-SC0011090)MIT Department of Physics Pappalardo ProgramNatural Sciences and Engineering Research Council of Canad
A representation basis for the quantum integrable spin chain associated
  with the su(3) algebra

An orthogonal basis of the Hilbert space for the quantum spin chain
associated with the su(3) algebra is introduced. Such kind of basis could be
treated as a nested generalization of separation of variables (SoV) basis for
high-rank quantum integrable models. It is found that all the monodromy-matrix
elements acting on a basis vector take simple forms. With the help of the
basis, we construct eigenstates of the su(3) inhomogeneous spin torus (the
trigonometric su(3) spin chain with antiperiodic boundary condition) from its
spectrum obtained via the off-diagonal Bethe Ansatz (ODBA). Based on small
sites (i.e. N=2) check, it is conjectured that the homogeneous limit of the
eigenstates exists, which gives rise to the corresponding eigenstates of the
homogenous model.Comment: 24 pages, no figure, published versio
Spectral duality in elliptic systems, six-dimensional gauge theories and
  topological strings

We consider Dotsenko-Fateev matrix models associated with compactified
Calabi-Yau threefolds. They can be constructed with the help of explicit
expressions for refined topological vertex, i.e. are directly related to the
corresponding topological string amplitudes. We describe a correspondence
between these amplitudes, elliptic and affine type Selberg integrals and gauge
theories in five and six dimensions with various matter content. We show that
the theories of this type are connected by spectral dualities, which can be
also seen at the level of elliptic Seiberg-Witten integrable systems. The most
interesting are the spectral duality between the XYZ spin chain and the
Ruijsenaars system, which is further lifted to self-duality of the double
elliptic system.Comment: 29 page
A Computer Test of Holographic Flavour Dynamics

We perform computer simulations of the Berkooz-Douglas (BD) matrix model,
holographically dual to the D0/D4-brane intersection. We generate the
fundamental condensate versus bare mass curve of the theory both
holographically and from simulations of the BD model. Our studies show
excellent agreement of the two approaches in the deconfined phase of the theory
and significant deviations in the confined phase. We argue the discrepancy in
the confined phase is explained by the embedding of the D4-brane which yields
stronger $\alpha'$ corrections to the condensate in this phase.Comment: 29 pages, 3 figures, updated to match the published versio
Enhancing the Higgs associated production with a top quark pair

It is pointed out that in a wide class of models reminiscent of type-II
Two-Higgs-Doublet Models (2HDM) the signal of the Higgs produced in association
with a top-antitop quark pair ($tth$) and decaying into gauge bosons can be
significantly larger than the Standard Model (SM) prediction without violating
any experimental constraints. The crucial feature of these models is enhanced
(suppressed) Higgs coupling to top (bottom) quarks and existence of light
colored particles that give negative contribution to the effective Higgs
coupling to gluons resulting in the gluon fusion rates in the gauge boson decay
channels close to SM predictions. We demonstrate this mechanism in NMSSM with
light stops and show that $tth$ signal in the $WW$ decay channel can be two
times larger than the SM prediction, as suggested by the excesses observed by
ATLAS and CMS, provided that the Higgs-singlet superpotential coupling
$\lambda\gtrsim0.8$ and the MSSM-like Higgs boson masses are in the range of
160 to 300 GeV.Comment: 19 pages, 4 figures; v2:comments and references added, matches
  published versio