pinecone/core-2020-05-10-deduplication huggingface dataset:
Revisiting simplified dark matter models in terms of AMS-02 and
  Fermi-LAT

We perform an analysis of the simplified dark matter models in the light of
cosmic ray observables by AMS-02 and Fermi-LAT. We assume fermion, scalar or
vector dark matter particle with a leptophobic spin-0 mediator that couples
only to Standard Model quarks and dark matter via scalar and/or pseudo-scalar
bilinear. The propagation and injection parameters of cosmic rays are
determined by the observed fluxes of nuclei from AMS-02. We find that the
AMS-02 observations are consistent with the dark matter framework within the
uncertainties. The AMS-02 antiproton data prefer 30 (50) GeV - 5 TeV dark
matter mass and require an effective annihilation cross section in the region
of 4x10^{-27} (7x10^{-27}) - 4x10^{-24} cm^3/s for the simplified fermion
(scalar and vector) dark matter models. The cross sections below 2x10^{-26}
cm^3/s can evade the constraint from Fermi-LAT dwarf galaxies for about 100 GeV
dark matter mass.Comment: 20 pages, 8 figures, 2 tables. arXiv admin note: text overlap with
  arXiv:1612.0950
Simplifying large spin bootstrap in Mellin space

We set up the conventional conformal bootstrap equations in Mellin space and
analyse the anomalous dimensions and OPE coefficients of large spin double
trace operators. By decomposing the equations in terms of continuous Hahn
polynomials, we derive explicit expressions as an asymptotic expansion in
inverse conformal spin to any order, reproducing the contribution of any
primary operator and its descendants in the crossed channel. The expressions
are in terms of known mathematical functions and involve generalized Bernoulli
(Norlund) polynomials and the Mack polynomials and enable us to derive certain
universal properties. Comparing with the recently introduced reformulated
equations in terms of crossing symmetric tree level exchange Witten diagrams,
we show that to leading order in anomalous dimension but to all orders in
inverse conformal spin, the equations are the same as in the conventional
formulation. At the next order, the polynomial ambiguity in the Witten diagram
basis is needed for the equivalence and we derive the necessary constraints for
the same.Comment: 48 pages, 6 figures, typos corrected, to appear in JHE
The Sudakov form factor at four loops in maximal super Yang-Mills theory

The four-loop Sudakov form factor in maximal super Yang-Mills theory is
analysed in detail. It is shown explicitly how to construct a basis of
integrals that have a uniformly transcendental expansion in the dimensional
regularisation parameter, further elucidating the number-theoretic properties
of Feynman integrals. The physical form factor is expressed in this basis for
arbitrary colour factor. In the nonplanar sector the required integrals are
integrated numerically using a mix of sector-decomposition and Mellin-Barnes
representation methods. Both the cusp as well as the collinear anomalous
dimension are computed. The results show explicitly the violation of quadratic
Casimir scaling at the four-loop order. A thorough analysis concerning the
reliability of reported numerical uncertainties is carried out.Comment: 47 pages, 17 figures; v4: fixed typo in eqs. (4.4) and (A.4), final
  result unchange
Modular energy inequalities from relative entropy

We obtain new constraints for the modular energy of general states by using
the monotonicity property of relative entropy. In some cases, modular energy
can be related to the energy density of states and these constraints lead to
interesting relations between energy and entropy. In particular, we derive new
quantum energy inequalities that improve some previous bounds for the energy
density of states in a conformal field theory. Additionally, the inequalities
derived in this manner also lead us to conclude that the entropy of the state
further restricts the possible amount of negative energy allowed by the theory.Comment: 23 pages, 9 figure
Closing in on the Wino LSP via trilepton searches at the LHC

The neutralino dark matter (DM) predicted by the Minimal Supersymmetric
Standard Model (MSSM) has been probed in several search modes at the Large
Hadron Collider (LHC), one of the leading ones among which is the trilepton
plus missing transverse momentum channel. The experimental analysis of this
mode has, however, been designed to probe mainly a bino-like DM, originating in
the decays of a pair of next-to-lightest neutralino and lightest chargino, both
of which are assumed to be wino-like. In this study, we analyse how this
trilepton channel can be tuned for probing also the wino-like DM. We note that,
while the mentioned standard production mode generally leads to a relatively
poor sensitivity for the wino-like DM, there are regions in the MSSM parameter
space where the net yield in the trilepton final state can be substantially
enhanced at the LHC with $\sqrt{s}=14$ TeV. This is achieved by taking into
account also an alternative channel, pair-production of the wino-like DM itself
in association with the heavier chargino, and optimisation of the kinematical
cuts currently employed by the LHC collaborations. In particular, we find that
the cut on the transverse mass of the third lepton highly suppresses both the
signal channels and should therefore be discarded in this DM scenario. We
perform a detailed detector-level study of some selected parameter space points
that are consistent with the most important experimental constraints, including
the recent ones from the direct and indirect DM detection facilities. Our
analysis demonstrates the high complementarity of the two channels, with their
combined significance reaching above 4$\sigma$ for a wino-like DM mass around
100 GeV, with an integrated luminosity as low as 100 fb$^{-1}$.Comment: 22 pages, 8 figures, 4 tables. Exclusion limits from Dark Matter
  Indirect Detection also taken into account. Significant improvements in
  figures and text. Final results and conclusions unchanged. Version to appear
  in JHE
Rigid limit for hypermultiplets and five-dimensional gauge theories

We study the rigid limit of a class of hypermultiplet moduli spaces appearing
in Calabi-Yau compactifications of type IIB string theory, which is induced by
a local limit of the Calabi-Yau. We show that the resulting hyperkahler
manifold is obtained by performing a hyperkahler quotient of the Swann bundle
over the moduli space, along the isometries arising in the limit. Physically,
this manifold appears as the target space of the non-linear sigma model
obtained by compactification of a five-dimensional gauge theory on a torus.
This allows to compute dyonic and stringy instantons of the gauge theory from
the known results on D-instantons in string theory. Besides, we formulate a
simple condition on the existence of a non-trivial local limit in terms of
intersection numbers of the Calabi-Yau, and find an explicit form for the
hypermultiplet metric including corrections from all mutually non-local
D-instantons, which can be of independent interest.Comment: 38+18+5 pages, 2 figures, fixed misprints in v
The Global Gauge Group Structure of F-theory Compactification with U(1)s

We show that F-theory compactifications with abelian gauge factors generally
exhibit a non-trivial global gauge group structure. The geometric origin of
this structure lies with the Shioda map of the Mordell--Weil generators. This
results in constraints on the U(1) charges of non-abelian matter consistent
with observations made throughout the literature. In particular, we find that
F-theory models featuring the Standard Model algebra actually realise the
precise gauge group [SU(3)xSU(2)xU(1)]/Z6. Furthermore, we explore the
relationship between the gauge group structure and geometric (un-)higgsing. In
an explicit class of models, we show that, depending on the global group
structure, an SU(2)xU(1) gauge theory can either unhiggs into an SU(2)xSU(2) or
an SU(3)xSU(2) theory. We also study implications of the charge constraints as
a criterion for the F-theory 'swampland'.Comment: 37 pages; v2: improved derivation of global group structure in
  section 2, extended discussion on the 'swampland' conjecture in section 5,
  references added, v2 accepted for publication in JHEP; v3: typos correcte
Exploring Non-Holomorphic Soft Terms in the Framework of Gauge Mediated
  Supersymmetry Breaking

It is known that in the absence of a gauge singlet field, a specific class of
supersymmetry (SUSY) breaking non-holomorphic (NH) terms can be soft breaking
in nature so that they may be considered along with the Minimal Supersymmetric
Standard Model (MSSM) and beyond. There have been studies related to these
terms in minimal supergravity based models. Consideration of an F-type SUSY
breaking scenario in the hidden sector with two chiral superfields however
showed Planck scale suppression of such terms. In an unbiased point of view for
the sources of SUSY breaking, the NH terms in a phenomenological MSSM (pMSSM)
type of analysis showed a possibility of a large SUSY contribution to muon
$g-2$, a reasonable amount of corrections to the Higgs boson mass and a drastic
reduction of the electroweak fine-tuning for a higgsino dominated
$\widetilde{\chi}^0_1$ in some regions of parameter space. We first investigate
here the effects of the NH terms in a low scale SUSY breaking scenario. In our
analysis with minimal gauge mediated supersymmetry breaking (mGMSB) we probe
how far the results can be compared with the previous pMSSM plus NH terms based
study. We particularly analyze the Higgs, stop and the electroweakino sectors
focusing on a higgsino dominated $\widetilde{\chi}^0_1$ and
$\widetilde{\chi}^{\pm}_1$, a feature typically different from what appears in
mGMSB. The effect of a limited degree of RG evolutions and vanishing of the
trilinear coupling terms at the messenger scale can be overcome by choosing a
non-minimal GMSB scenario, such as one with a matter-messenger interaction.Comment: 27 pages, 9 figures, some text added, results and conclusion
  unchanged, Accepted in JHE
QCD-induced Electroweak Phase Transition

Phase transitions associated with nearly conformal dynamics are known to lead
to significant supercooling. A notorious example is the phase transition in
Randall-Sundrum models or their CFT duals. In fact, it was found that the phase
transition in this case is first-order and the tunneling probability for the
radion/dilaton is so small that the system typically remains trapped in the
false vacuum and the phase transition never completes. The universe then keeps
expanding and cooling. Eventually the temperature drops below the QCD scale. We
show that the QCD condensates which subsequently form give an additional
contribution to the radion/dilaton potential, an effect which had been ignored
so far. This significantly reduces the barrier in the potential and allows the
phase transition to complete in a substantially larger region of parameter
space. Due to the supercooling, electroweak symmetry is then broken
simultaneously. This class of models therefore naturally leads to an
electroweak phase transition taking place at or below QCD temperatures, with
interesting cosmological implications and signatures.Comment: 33 pages, 5 figure
Probing new electroweak states via precision measurements at the LHC and future colliders.

Several new physics scenarios, motivated e.g. by dark matter, feature new electroweakly charged states where the lightest particle in the multiplet is stable and neutral. In such cases direct searches at LHC are notoriously difficult, while electroweak precision tests both at hadron and lepton colliders offer the possibility to indirectly probe those states. In this work, we assess the sensitivity of the high-luminosity phase of the LHC on new electroweak multiplets via the modification of neutral and charged Drell-Yan processes, and compare the reach of future hadron and lepton colliders presently under consideration
Self-dual sectors for scalar field theories in (1 + 1) dimensions.

We use ideas of generalized self-duality conditions to construct real scalar field theories in (1 + 1)-dimensions with exact self dual sectors. The approach is based on a pre-potential U that defines the topological charge and the potential energy of these theories. In our algebraic method to construct the required pre-potentials we use the representation theory of Lie groups. This approach leads naturally to an infinite set of degenerate vacua and so to topologically non-trivial self-dual solutions of these models. We present explicit examples for the groups SU(2), SU(3) and SO(5) and discuss some properties of these solutions
Global Anomalies, Discrete Symmetries, and Hydrodynamic Effective
  Actions

We derive effective actions for parity-violating fluids in both $(3+1)$ and
$(2+1)$ dimensions, including those with anomalies. As a corollary we confirm
the most general constitutive relations for such systems derived previously
using other methods. We discuss in detail connections between parity-odd
transport and underlying discrete symmetries. In (3+1) dimensions we elucidate
connections between anomalous transport coefficients and global anomalies, and
clarify a previous puzzle concerning transports and local gravitational
anomalies.Comment: 48 pages, 1 figure. v2: Updated reference
Neutrino trident scattering at near detectors.

Neutrino trident scattering is a rare Standard Model process where a charged-lepton pair is produced in neutrino-nucleus scattering. To date, only the dimuon final-state has been observed, with around 100 total events, while the other channels are as yet unexplored. In this work, we compute the trident production cross section by performing a complete four-body phase space calculation for different hadronic targets. This provides a correct estimate both of the coherent and the diffractive contributions to these cross sections, but also allows us to address certain inconsistencies in the literature related to the use of the Equivalent Photon Approximation in this context. We show that this approximation can give a reasonable estimate only for the production of dimuon final-states in coherent scattering, being inadmissible for all other cases considered. We provide estimates of the number and distribution of trident events at several current and future near detector facilities subjected to intense neutrino beams from accelerators: five liquid-argon detectors (SBND, μBooNE, ICARUS, DUNE and νSTORM), the iron detector of T2K (INGRID) and three detectors made of composite material (MINOS, NOνA and MINERνA). We find that for many experiments, trident measurements are an attainable goal and a valuable addition to their near detector physics programme
Search for Heavy Majorana Neutrinos in Same-Sign Dilepton Channels in Proton-Proton Collisions at √s = 13 TeV

A search is performed for a heavy Majorana neutrino (N), produced in leptonic decay of a W boson propagator and decaying into a W boson and a lepton, with the CMS detector at the LHC. The signature used in this search consists of two same-sign leptons, in any flavor combination of electrons and muons, and at least one jet. The data were collected during 2016 in proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.9 fb⁻¹. The results are found to be consistent with the expected standard model background. Upper limits are set in the mass range between 20 and 1600 GeV in the context of a Type-I seesaw mechanism, on |VeN|², |VμN|², and |VeNV μN * |²/(|VeN|² + |VμN|²), where VℓN is the matrix element describing the mixing of N with the standard model neutrino of flavor ℓ = e, μ. For N masses between 20 and 1600 GeV, the upper limits on |VℓN|2 range between 2.3 × 10⁻⁵ and unity. These are the most restrictive direct limits for heavy Majorana neutrino masses above 430 GeV
Search for Supersymmetry in Events with a Photon, a Lepton, and Missing Transverse Momentum in Proton-Proton Collisions at √s = 13 TeV

Results of a search for supersymmetry are presented using events with a photon, an electron or muon, and large missing transverse momentum. The analysis is based on a data sample corresponding to an integrated luminosity of 35.9 fb⁻¹ of proton-proton collisions at √s = 13 TeV, produced by the LHC and collected with the CMS detector in 2016. Theoretical models with gauge-mediated supersymmetry breaking predict events with photons in the final state, as well as electroweak gauge bosons decaying to leptons. Searches for events with a photon, a lepton, and missing transverse momentum are sensitive probes of these models. No excess of events is observed beyond expectations from standard model processes. The results of the search are interpreted in the context of simplified models inspired by gauge-mediated supersymmetry breaking. These models are used to derive upper limits on the production cross sections and set lower bounds on masses of supersymmetric particles. Gaugino masses below 930 GeV are excluded at the 95% confidence level in a simplified model with electroweak production of a neutralino and chargino. For simplified models of gluino and squark pair production, gluino masses up to 1.75 TeV and squark masses up to 1.43 TeV are excluded at the 95% confidence level. Keywords: Hadron-Hadron scattering (experiments): Supersymmetr
Precise predictions for   tt¯γ/tt¯  cross section ratios at the LHC.

With the goal of increasing the precision of NLO QCD predictions for the   pp→tt¯γ  process in the di-lepton top quark decay channel we present theoretical predictions for the   R=σtt¯γ/σtt¯ cross section ratio. Results for the latter together with various differential cross section ratios are given for the LHC with the Run II energy of   s√=13  TeV. Fully realistic NLO computations for   tt¯  and   tt¯γ  production are employed. They are based on matrix elements for   e+νeμ−ν¯¯¯μbb¯¯  and   e+νeμ−ν¯¯¯μbb¯¯γ  processes and include all resonant and non-resonant diagrams, interferences, and off-shell effects of the top quarks and the W gauge bosons. Various renormalisation and factorisation scale choices and parton density functions are examined to assess their impact on the cross section ratio. Depending on the transverse momentum cut on the hard photon a judicious choice of a dynamical scale allows us to obtain 1%–3% percent precision on   R . Moreover, for differential cross section ratios theoretical uncertainties in the range of 1%-6% have been estimated. Until now such high precision predictions have only been reserved for the top quark pair production at NNLO QCD. Thus,   R at NLO in QCD represents a very precise observable to be measured at the LHC for example to study the top quark charge asymmetry or to probe the strength and the structure of the t-  t¯ -γ vertex. The latter can shed some light on possible new physics that can reveal itself only once sufficiently precise theoretical predictions are available
Defect loops in gauged Wess-Zumino-Witten models

We consider loop observables in gauged Wess-Zumino-Witten models, and study
the action of renormalization group flows on them. In the WZW model based on a
compact Lie group G, we analyze at the classical level how the space of
renormalizable defects is reduced upon the imposition of global and affine
symmetries. We identify families of loop observables which are invariant with
respect to an affine symmetry corresponding to a subgroup H of G, and show that
they descend to gauge-invariant defects in the gauged model based on G/H. We
study the flows acting on these families perturbatively, and quantize the fixed
points of the flows exactly. From their action on boundary states, we present a
derivation of the "generalized Affleck-Ludwig rule, which describes a large
class of boundary renormalization group flows in rational conformal field
theories.Comment: 43 pages, 2 figures. v2: a few typos corrected, version to be
  published in JHE
Extended Gauge Symmetries in F-theory

We study gauge symmetry in F-theory in light of global aspects. For this, we
consider not only a simple (local) group, but also a semi-simple group with
Abelian factors. Once we specify the complete gauge group by decomposing the
discriminant, analogous to arranging 7-branes, we can derive the matter
contents, their localization and the relation to enhanced groups. Global
constraints coming from Calabi--Yau conditions and anomaly cancellations imply
a unified group. The semisiple group shows explicit formation of matter curves
and nontriviality of its embedding into exceptional group. Also the dual
heterotic string vacua with line bundles provide a guide on the unification.Comment: 30 pages, published versio
Soft Terms from Broken Symmetries

In theories of phyiscs beyond the Standard Model (SM), visible sector fields often carry quantum numbers under additional gauge symmetries. One could then imagine a scenario in which these extra gauge symmetries play a role in transmitting supersymmetry breaking from a hidden sector to the Supersymmetric Standard Model (SSM). In this paper we present a general formalism for studying the resulting hidden sectors and calculating the corresponding gauge mediated soft parameters. We find that a large class of generic models features a leading universal contribution to the soft scalar masses that only depends on the scale of Higgsing, even if the model is strongly coupled. As a by-product of our analysis, we elucidate some IR aspects of the correlation functions in General Gauge Mediation. We also discuss possible phenomenological applications
New Gauged Linear Sigma Models for 8D HyperKahler Manifolds and
  Calabi-Yau Crystals

We propose two kinds of gauged linear sigma models whose moduli spaces are
real eight-dimensional hyperKahler and Calabi-Yau manifolds, respectively.
Here, hyperKahler manifolds have sp(2) holonomy in general and are dual to Type
IIB (p,q)5-brane configurations. On the other hand, Calabi-Yau fourfolds are
toric varieties expressed as quotient spaces. Our model involving fourfolds is
different from the usual one which is directly related to a symplectic quotient
procedure. Remarkable features in newly-found three-dimensional
Chern-Simons-matter theories appear here as well, such as dynamical
Fayet-Iliopoulos parameters, one dualized photon and its residual discrete
gauge symmetry.Comment: 20 pages, 1 figure; v2: minor changes and references added; v3:
  statements improved, newer than JHEP versio
BPS Open Strings and A-D-E-singularities in F-theory on K3

We improve on a recently constructed graphical representation of the
supergravity 7-brane solution and apply this refined representation to re-study
the open string description of the A-D-E-singularities in F-theory on K3. A
noteworthy feature of the graphical representation is that it provides the
complete global branch cut structure of the 7-brane solution which plays an
important role in our analysis. We first identify those groups of branes which
when made to coincide lead to the A-D-E-gauge groups. We next show that there
is always a sufficient number of open BPS strings to account for all the
generators of the gauge group. However, as we will show, there is in general no
one-to-one relation between BPS strings and gauge group generators.
  For the D_{n+4}- and E-singularities, in order to relate BPS strings with
gauge group generators, we make an SU(n+4), respectively SU(5) subgroup of the
D_{n+4}- and E-gauge groups manifest. We find that only for the D-series (and
for the standard A-series) this is sufficient to identify, in a one-to-one
manner, which BPS strings correspond to which gauge group generators.Comment: 37 pages, 15 figure