pinecone/core-2020-05-10-deduplication huggingface dataset:
Double-logarithms in Einstein-Hilbert gravity and supergravity

We study the interplay between graviton reggeization and double-logarithmic in energy contributions to four-graviton scattering in theories with and without supersymmetry. Predictions to all orders in the gravitational coupling are given for these double-logarithms. As the number of supersymmetries grows these terms generate a convergent behaviour for the amplitudes at very high energies. At two-loop level, we find agreement with previous exact results for N $$ \mathcal{N} $$ = 8 supergravity and with those of Boucher-Veronneau and Dixon, who studied the N $$ \mathcal{N} $$ = 4, 5, 6 supergravities using a conjectured double-copy structure of gravity
Impact of a four-zero Yukawa texture on h → γγ and γZ in the framework of the Two Higgs Doublet Model Type III

We study the substantial enhancement, with respect to the corresponding Standard Model rates, that can be obtained for the branching ratios of the decay channels h → γγ and h → γZ within the framework of the Two Higgs Doublet Model Type III, assuming a four-zero Yukawa texture and a general Higgs potential. We show that these processes are very sensitive to the flavor pattern entering the Yukawa texture and to the triple coupling structure of the Higgs potential, both of which impact onto the aforementioned decays. We can accommodate the parameters of the model in such a way to obtain the h → γγ rates reported by the Large Hadron Collider and at the same time we get a h → γZ fraction much larger than in the Standard Model, indeed within experimental reach. We present some scenarios where this phenomenology is realized for spectrum configurations that are consistent with current constraints. We also discuss the possibility of obtaining a light charged Higgs boson compatible with all such measurements, thereby serving the purpose of providing a hallmark signal of the scenario considered
Pseudo-goldstino and electroweak gauginos at the LHC

The multi-sector SUSY breaking predicts the existence of pseudo-goldstino, which could couple more strongly to visible fields than ordinary gravitino. Then the lightest neutralino and chargino can decay into a pseudo-goldstino plus a Z -boson, Higgs boson or W -boson. In this note we perform a Monte Carlo simulation for the direct productions of the lightest neutralino and chargino followed by the decays to pseudo-goldstino. Considering scenarios with higgsino-like, bino-like or wino-like lightest neutralino, we find that the signal-to-background ratio at the high luminosity LHC is between 6 and 25% and the statistical significance can be above 5 σ
Two-dimensional ${\cal N} = (2, 2)$ Lattice Gauge Theories with Matter
  in Higher Representations

We construct two-dimensional ${\cal N} = (2, 2)$ supersymmetric gauge
theories on a Euclidean spacetime lattice with matter in the two-index
symmetric and anti-symmetric representations of SU($N_c$) color group. These
lattice theories preserve a subset of the supercharges exact at finite lattice
spacing. The method of topological twisting is used to construct such theories
in the continuum and then the geometric discretization scheme is used to
formulate them on the lattice. The lattice theories obtained this way are
gauge-invariant, free from fermion doubling problem and exact supersymmetric at
finite lattice spacing. We hope that these lattice constructions further
motivate the nonperturbative explorations of models inspired by technicolor,
orbifolding and orientifolding in string theories and the Corrigan-Ramond
limit.Comment: 16 pages, 1 figure. v2: New section on fine tuning added. Slight
  modification in abstract. Version matches with the one accepted for
  publicatio
Constraints on the R-charges of free bound states from the Römelsberger index

The Römelsberger index on S 3 × ℝ $$ \mathbb{R} $$ serves as a powerful test for conjectured dualities, relying on the claim that this object is an RG-invariant. In this work we support this claim by showing that the singularities suggested by Witten of “states moving in from infinity” are excluded on S 3 × ℝ $$ \mathbb{R} $$ . In addition, we provide an application of the Römelsberger index, in the form of a constraint on the RG flow of supersymmetric theories. The constraint, which applies for asymptotically free theories with unbroken supersymmetry and non-anomalous R-symmetry, is the following: if the R-charges of the chiral multiplets in the UV theory are q i ∈ (0 , 2) and the IR theory can be described as a free theory of chiral bound states, then the R-charges of these bound states, q ˜ j $$ {\tilde{q}}_j $$ , are constrained such that q ˜ j ∈ 0 2 $$ {\tilde{q}}_j\in \left(0,2\right) $$ . We thus provide a proof of a weak version of a conjecture proposed by Intriligator. We mention some applications of this result
Entanglement entropy of α -vacua in de Sitter space

We consider the entanglement entropy of a free massive scalar field in the one parameter family of α -vacua in de Sitter space by using a method developed by Maldacena and Pimentel. An α -vacuum can be thought of as a state filled with particles from the point of view of the Bunch-Davies vacuum. Of all the α -vacua we find that the entanglement entropy takes the minimal value in the Bunch-Davies solution. We also calculate the asymptotic value of the Rényi entropy and find that it increases as α increases. We argue these features stem from pair condensation within the non-trivial α -vacua where the pairs have an intrinsic quantum correlation
Spin(7) duality for N=1 CS-matter theories

In this paper we propose a duality for non-holomorphic N=1 CS-matter theories
living on M2 branes probing Spin(7) cones. We call this duality Spin(7)
duality. Two theories are named Spin(7) dual if they have the same moduli
space: a real Spin(7) cone with base a weak G_2 manifold, and they are hence
holographic dual to the same AdS_4 x G_2 M theory solution. We provide a
systematic way to generate these dualities, derived by combining toric duality
for N=2 CS-matter theories and generalized non-holomorphic orientifold
projections to N=1. Brane construction, AdS/CFT correspondence, and the
computation of the moduli space support our proposal at the classical level and
provide some arguments at the quantum strong coupling regime. The relation with
Seiberg-like duality is also analyzed.Comment: 37 pages, 3 figure
High-Scale SUSY Breaking Models in light of the BICEP2 Result

The large value of the tensor-to-scalar ratio in the cosmic microwave
background radiation reported by the BICEP2 collaboration gives strong impact
on models of supersymmetry (SUSY). The large ratio indicates inflation with a
high-energy scale and thus a high reheating temperature in general, and various
SUSY models suffer from the serious gravitino and Polonyi problems. In this
article, we discuss a class of the high-scale SUSY breaking models which are
completely free from those problems. With especially focusing on the dark
matter relic abundance, we examine how the BICEP2 result narrows down the
parameter space of the models, assuming the simplest chaotic inflation model.
We find that the mass of the dark matter is predicted to be less than about 1
TeV thanks to the non-thermal production in the early universe through the
decay of abundant gravitinos produced after the reheating process. We also
discuss implications in some details to dark matter searches at collider and
indirect dark matter detection experiments.Comment: 17 pages, 6 figure
Exact Collapse Solutions in D=4, N=4 Gauged Supergravity and Their
  Generalizations

We construct an exact time-dependent solution in $D=4$, ${\cal N}=4$ gauged
supergravity, where the gauge fields of the $U(1)\times U(1)$ subgroup of the
$SO(4)$ carry independent conserved charges. The solution describes a decaying
white hole that settles down to the final state as a static charged black hole.
We analyze the global structure and lift the solution back to $D=11$
supergravity. We further extend the theory by adding an extra term in the
scalar potential and obtain a more general class of collapse solutions. The
result constitutes a charged generalization of the Roberts solution and the
dynamical scalar-hairy black hole solutions that have been very recently found
by us. The generalized Roberts solutions demonstrate that a scalar coupled to
gravity can be unstable even when it is confined by a scalar potential with a
fixed point.Comment: 15 page
Observation of the $\Lambda_b^0\rightarrow J/\psi p \pi^-$ decay

The first observation of the Cabibbo-suppressed decay $\Lambda_b^0\rightarrow J/\psi p \pi^-$ is reported using a data sample of proton-proton collisions at 7 and 8 TeV, corresponding to an integrated luminosity of 3 $\rm fb^{-1}$. A prominent signal is observed and the branching fraction relative to the decay mode $\Lambda_b^0\rightarrow J/\psi p K^-$ is determined to be $$ \frac{{\cal B}(\Lambda_b^0\rightarrow J/\psi p \pi^-)}{{\cal B}(\Lambda_b^0\rightarrow J/\psi p K^-)}=0.0824\pm0.0025\:(\text{stat})\pm0.0042\:(\text{syst}). $$ A search for direct CP violation is performed. The difference in the CP asymmetries between these two decays is found to be $$ {\cal A}_{CP}(\Lambda_b^0\rightarrow J/\psi p \pi^-)-{\cal A}_{CP}(\Lambda_b^0\rightarrow J/\psi p K^-)=(+5.7\pm 2.4\:(\text{stat})\pm1.2\:(\text{syst}))\%, $$ which is compatible with CP symmetry at the $2.2\sigma$ level
Spectrum of the charmed and b-flavored mesons in the relativistic potential model

We study the bound states of heavy-light quark-antiquark system in the relativistic potential model, where the potential includes the long-distance confinement term, the short-distance Coulomb term and spin-dependent term. The spectrum of B , B * , D , D * and states with higher orbital quantum numbers are obtained. Compared with previous results predicted in the relativistic potential model, the predictions are improved and extended in this work, more theoretical masses are predicted which can be tested in experiment in the future
Localization of supersymmetric Chern-Simons-Matter theory on a squashed S 3 with SU(2) × U(1) isometry

Localization of supersymmetric N $$ \mathcal{N} $$ = 2 Chern-Simons-Matter theory on a squashed S 3 with SU(2) × U(1) isometry has been studied by different groups of authors. In this paper, we localize the theory on a squashed S 3 with SU(2) × U(1) isometry and a class of complex background. We see that certain kinds of shifts of the background gauge fields are crucial in obtaining nontrivial results, and the previously found results on this manifold can be incorporated in our results as special limits
Punctures from Probe M5-Branes and N=1 Superconformal Field Theories

We study probe M5-branes in N=1 AdS5 solutions of M-theory that arise from
M5-branes wrapped on a Riemann surface. Using the BPS condition from
kappa-symmetry, we classify supersymmetric probe M5-branes that extend along
all of AdS5 and intersect the Riemann surface at points. These can be viewed as
punctures in the dual N=1 superconformal field theories. We find M5-branes that
correspond to the two types of simple punctures previously studied in field
theory. In addition, when the central charge is rational, we find a new class
of M5-branes with a moduli space that includes two internal dimensions in
addition to the Riemann surface. These new M5-branes have the essential
characteristic of fractional branes, in that a single one at a generic point of
its moduli space becomes multiple M5-branes at special points.Comment: 29 pages, 9 figure
On the ratio of ttbb and ttjj cross sections at the CERN Large Hadron
  Collider

Triggered by ongoing experimental analyses, we report on a study of the cross
section ratio sigma(pp -> ttbb)/sigma(pp -> ttjj) at the next-to-leading order
in QCD, focusing on both present and future collider energies: sqrt{s}= 7, 8,
13 TeV. In particular, we provide a comparison between our predictions and the
currently available CMS data for the 8 TeV run. We further analyse the
kinematics and scale uncertainties of the two processes for a single set of
parton distribution functions, with the goal of assessing possible correlations
that might help to reduce the theoretical error of the ratio and thus enhance
the predictive power of this observable. We argue that the different jet
kinematics makes the ttbb and ttjj processes uncorrelated in several
observables, and show that the scale uncertainty is not significantly reduced
when taking the ratio of the cross sections.Comment: 23 pages, 10 figures, 3 tables, some issues clarified,
  acknowledgement and references added, version to appear in JHE
Exact results for vortex loop operators in 3d supersymmetric theories

Three dimensional field theories admit disorder line operators, dubbed vortex loop operators. They are defined by the path integral in the presence of prescribed singularities along the defect line. We study half-BPS vortex loop operators for N $$ \mathcal{N} $$ = 2 supersymmetric theories on S $$ \mathbb{S} $$ 3 , its deformation S b 3 $$ {\mathbb{S}}_b^3 $$ and S $$ \mathbb{S} $$ 1 × S $$ \mathbb{S} $$ 2 . We construct BPS vortex loops defined by the path integral with a fixed gauge or flavor holonomy for infinitesimal curves linking the loop. It is also possible to include a singular profile for matter fields. For vortex loops defined by holonomy, we perform supersymmetric localization by calculating the fluctuation modes, or alternatively by applying the index theory for transversally elliptic operators. We clarify how the latter method works in situations without fixed points of relevant isometries. Abelian mirror symmetry transforms Wilson and vortex loops in a specific way. In particular an ordinary Wilson loop transforms into a vortex loop for a flavor symmetry. Our localization results confirm the predictions of abelian mirror symmetry
BCFW recursion for off-shell gluons

It is shown how tree-level multi-gluon helicity amplitudes with an arbitrary
number of off-shell external gluons can be calculated via BCFW recursion.
Compact expressions for helicity amplitudes for scattering processes of three
and four gluons, with up to three of them off-shell, are presented. Also,
maximum-helicity-violating configurations are identified for up to two
off-shell gluons, and the expressions for their helicity amplitudes for an
arbitrary number of on-shell gluons are derived.Comment: 24 pages, report number correcte
Observation of the $B^{0}_{s}\rightarrow J/\psi K_{{\rm S}}^{0} K^{\pm} \pi^{\mp}$ decay

Decays of the form $B^{0}_{(s)}\rightarrow J/\psi K_{{\rm S}}^{0} h^+ h^{\left(\prime\right) -}$ ($h^{(\prime)} = K, \pi$) are searched for in proton-proton collision data corresponding to an integrated luminosity of $1.0 \, {\rm fb}^{-1}$ recorded with the LHCb detector. The first observation of the $B^{0}_{s}\rightarrow J/\psi K_{{\rm S}}^{0} K^{\pm} \pi^{\mp}$ decay is reported, with significance in excess of 10 standard deviations. The $B^{0}\rightarrow J/\psi K_{{\rm S}}^{0} K^{+} K^{-}$ decay is also observed for the first time. The branching fraction of $B^{0}\rightarrow J/\psi K_{{\rm S}}^{0} \pi^{+} \pi^{-}$ is determined, to significantly better precision than previous measurements, using $B^0 \rightarrow J/\psi K_{{\rm S}}^{0}$ as a normalisation channel. Branching fractions and upper limits of the other $B^{0}_{(s)}\rightarrow J/\psi K_{{\rm S}}^{0} h^+ h^{\left(\prime\right) -}$ modes are determined relative to that of the $B^{0}\rightarrow J/\psi K_{{\rm S}}^{0} \pi^{+} \pi^{-}$ decay
Towards model-independent approach to the analysis of interference effects in pair production of new heavy quarks

We propose a model independent approach for the analysis of interference effects in the process of QCD pair production of new heavy quarks of different species that decay into Standard Model particles, including decays via flavour changing neutral currents. By adopting as ansatz a simple analytical formula we show that one can accurately describe the interference between two different such particle pairs leading to the same final state using information about masses, total widths and couplings. A study of the effects on differential distributions is also performed showing that, when interference plays a relevant role, the distributions of the full process can be obtained by a simple rescaling of the distributions of either quark contributing to the interference term. We also present the range of validity of the analytical expression that we have found
One-loop γγ  →  W L + W L − and γγ → Z L Z L from the Electroweak Chiral Lagrangian with a light Higgs-like scalar

In this work we study the γγ  →  W L + W L − and γγ → Z L Z L scattering processes within the effective chiral Lagrangian approach, including a light Higgs-like scalar as a dynamical field together with the would-be-Goldstone bosons w ± and z associated to the electroweak symmetry breaking. This approach is inspired by the possibility that the Higgs-like boson be a composite particle behaving as another Goldstone boson, and assumes the existence of a mass gap between m h , m W , m Z and the potential new emergent resonances, setting an intermediate energy region (above m h , W , Z and below the resonance masses) where the use of these effective chiral Lagrangians are the most appropriate tools to compute the relevant observables. We analyse in detail the proper chiral counting rules for the present case of photon-photon scattering and provide the computation of the one-loop γγ  →  W L + W L − and γγ → Z L Z L scattering amplitudes within this Effective Chiral Lagrangian approach and the Equivalence Theorem, including a discussion on the involved renormalization procedure. We also propose here a joint analysis of our results for the twophoton scattering amplitudes together with other photonic processes and electroweak (EW) precision observables for a future comparison with data. This could help to disentangle the nature of the light Higgs-like particle
Abelian Duality at Higher Genus

In three dimensions, a free, periodic scalar field is related by duality to
an abelian gauge field. Here I explore aspects of this duality when both
theories are quantized on a Riemann surface of genus g. At higher genus,
duality involves an identification of winding with momentum on the Jacobian
variety of the Riemann surface. I also consider duality for monopole and loop
operators on the surface and exhibit the operator algebra, a refinement of the
Wilson-'t Hooft algebra.Comment: 53 pages, 1 figure, v2: references adde
Torsional response of relativistic fermions in $2+1$ dimensions

We consider the equilibrium partition function of an ideal gas of Dirac
fermions minimally coupled to torsion in $2+1$ dimensions. We show that the
energy-momentum tensor reproduces the Hall viscosity and other parity violating
terms of first order in the torsion. We also consider the modifications of the
constitutive relations, and classify the corresponding susceptibilities. An
entropy current consistent with zero production of entropy in equilibrium is
constructed.Comment: 13 pages; v2: improved discussion in sections 3 and 5, references
  added, matches the journal versio
Walking in the 3-dimensional large N scalar model

The solvability of the three-dimensional O(N) scalar field theory in the large N limit makes it an ideal toy model exhibiting “walking” behavior, expected in some SU(N) gauge theories with a large number of fermion flavors. We study the model using lattice regularization and show that when the ratio of the particle mass to an effective 4-point coupling (with dimension mass) is small, the beta function associated to the running 4-point coupling is “walking”. We also study lattice artifacts and finite size effects, and find that while the former can be sizable at realistic correlation length, the latter are under control already at lattice sizes a few (∼3) correlation lengths. We show the robustness of the walking phenomenon by showing that it can also be observed by studying physical observables such as the scattering phase shifts and the mass gap in finite volume
Accidental composite dark matter

We build models where Dark Matter candidates arise as composite states of a new confining gauge force, stable thanks to accidental symmetries. Restricting to renormalizable theories compatible with SU(5) unification, we find 13 models based on SU( N ) gauge theories and 9 based on SO( N ). We also describe other models that require non-renormalizable interactions. The two gauge groups lead to distinctive phenomenologies: SU( N ) theories give complex DM, with potentially observable electric and magnetic dipole moments that lead to peculiar spin-independent cross sections; SO( N ) theories give real DM, with challenging spin-dependent cross sections or inelastic scatterings. Models with Yukawa couplings also give rise to spin-independent direct detection mediated by the Higgs boson and to electric dipole moments for the electron. In some models DM has higher spin. Each model predicts a specific set of lighter composite scalars, possibly observable at colliders
On thermalization of a boost-invariant non-Abelian plasma

Using a holographic method, we further investigate the relaxation towards the hydrodynamic regime of a boost-invariant non-Abelian plasma taken out-of-equilibrium. In the dual description, the system is driven out-of-equilibrium by boundary sourcing, a deformation of the boundary metric, as proposed by Chesler and Yaffe. The effects of several deformation profiles on the bulk geometry are investigated by the analysis of the corresponding solutions of the Einstein equations. The time of restoration of the hydrodynamic regime is investigated: setting the effective temperature of the system at the end of the boundary quenching to T eff ( τ * ) = 500 MeV, the hydrodynamic regime is reached after a lapse of time of O $$ \mathcal{O} $$ (1 fm/c)
N=2 supersymmetric gauge theories on S2×S2 and Liouville Gravity

We consider N=2 supersymmetric gauge theories on four manifolds admitting an isometry. Generalized Killing spinor equations are derived from the consistency of supersymmetry algebrae and solved in the case of four manifolds admitting a U(1) isometry. This is used to explicitly compute the supersymmetric path integral on S2× S2 via equivariant localization. The building blocks of the resulting partition function are shown to contain the three point functions and the conformal blocks of Liouville Gravity
Lifting flat directions in lattice supersymmetry

We present a procedure to improve the lattice definition of $\mathcal N = 4$
supersymmetric Yang--Mills theory. The lattice construction necessarily
involves U(1) flat directions, and we show how these can be lifted without
violating the exact lattice supersymmetry. The basic idea is to modify the
equations of motion of an auxiliary field, which determine the moduli space of
the system. Applied to numerical calculations, the resulting improved lattice
action leads to dramatically reduced violations of supersymmetric Ward
identities and much more rapid approach to the continuum limit
On Multi-step BCFW Recursion Relations

In this paper, we extensively investigate the new algorithm known as the
multi-step BCFW recursion relations. Many interesting mathematical properties
are found and understanding these aspects, one can find a systematic way to
complete the calculation of amplitude after finite, definite steps and get the
correct answer, without recourse to any specific knowledge from field theories,
besides mass dimension and helicities. This process consists of the pole
concentration and inconsistency elimination. Terms that survive inconsistency
elimination cannot be determined by the new algorithm. They include polynomials
and their generalizations, which turn out to be useful objects to be explored.
Afterwards, we apply it to the Standard Model plus gravity to illustrate its
power and limitation. Ensuring its workability, we also tentatively discuss how
to improve its efficiency by reducing the steps.Comment: 38 pages, 13 figures, 3 appendice