pinecone/core-2020-05-10-deduplication huggingface dataset:
Measurement of the fraction of Υ(1S) originating from χb(1P) decays in pp collisions at s√=7 TeV

The production of χb(1P ) mesons in pp collisions at a centre-of-mass energy of 7 TeV is studied using 32 pb−1 of data collected with the LHCb detector. The χb(1P ) mesons are reconstructed in the decay mode χ b (1P ) → Υ (1S)γ → μ + μ −γ. The fraction of Υ (1S) originating from χb(1P ) decays in the Υ (1S) transverse momentum range 6 < pT Υ (1S) < 15 GeV/c and rapidity range 2.0 < y Υ (1S) < 4.5 is measured to be (20.7±5.7±2.1+2.7−5.4)% , where the first uncertainty is statistical, the second is systematic and the last gives the range of the result due to the unknown Υ (1S) and χb(1P) polarizations
Potential theory, path integrals and the Laplacian of the indicator

This paper links the field of potential theory — i.e. the Dirichlet and Neumann problems for the heat and Laplace equation — to that of the Feynman path integral, by postulating the some seemingly ill-defined potential. The Laplacian of the indicator can be interpreted using the theory of distributions: it is the d-dimensional analogue of the Dirac δ′-function, which can formally be defined as the second derivative of the Heaviside step function. We show, first, that the path integral’s perturbation series (or Born series) matches the classical single and double boundary layer series of potential theory, thereby connecting two hitherto unrelated fields. Second, we show that the perturbation series is valid for all domains D that allow Green’s theorem (i.e. with a finite number of corners, edges and cusps), thereby expanding the classical applicability of boundary layers. Third, we show that the minus (plus) in the potential holds for the Dirichlet (Neumann) boundary condition; showing for the first time a particularly close connection between these two classical problems. Fourth, we demonstrate that the perturbation series of the path integral converges as follows monotonically. We also discuss the third boundary problem (which poses Robin boundary conditions) and discuss an extension to moving domains
On Holography with Hyperscaling Violation

We study certain features of strongly coupled theories with hyperscaling
violation by making use of their gravitational duals. We will consider models
with an anisotropic scaling in time or in one of spatial directions. In
particular for the case where the anisotropic scaling is along a spatial
direction we will compute the holographic entanglement entropy and show that
for specific values of the parameters it exhibits a logarithmic violation of
the area law. We will also probe the backgrounds by different closed and open
strings which in turn can be used to read, for example, effective potential of
an external object, drag force and etc.Comment: 25 pages, 3 figure
Two- and three-point functions in two-dimensional Landau-gauge
  Yang-Mills theory: Continuum results

We investigate the Dyson-Schwinger equations for the gluon and ghost
propagators and the ghost-gluon vertex of Landau-gauge gluodynamics in two
dimensions. While this simplifies some aspects of the calculations as compared
to three and four dimensions, new complications arise due to a mixing of
different momentum regimes. As a result, the solutions for the propagators are
more sensitive to changes in the three-point functions and the ansaetze used
for them at the leading order in a vertex a expansion. Here, we therefore go
beyond this common truncation by including the ghost-gluon vertex
self-consistently for the first time, while using a model for the three-gluon
vertex which reproduces the known infrared asymptotics and the zeros at
intermediate momenta as observed on the lattice. A separate computation of the
three-gluon vertex from the results is used to confirm the stability of this
behavior a posteriori. We also present further arguments for the absence of the
decoupling solution in two dimensions. Finally, we show how in general the
infrared exponent kappa of the scaling solutions in two, three and four
dimensions can be changed by allowing an angle dependence and thus an essential
singularity of the ghost-gluon vertex in the infrared.Comment: 24 pages; added references, improved choices of parameters for vertex
  models; identical to version published in JHE
On the Quantum Geometry of Multi-critical CDT

We discuss extensions of a recently introduced model of multi-critical CDT to
higher multi-critical points. As in the case of pure CDT the continuum limit
can be taken on the level of the action and the resulting continuum surface
model is again described by a matrix model. The resolvent, a simple observable
of the quantum geometry which is accessible from the matrix model is calculated
for arbitrary multi-critical points. We go beyond the matrix model by
determining the propagator using the peeling procedure which is used to extract
the effective quantum Hamiltonian and the fractal dimension in agreement with
earlier results by Ambjorn et al. With this at hand a string field theory
formalism for multi-critical CDT is introduced and it is shown that the
Dyson-Schwinger equations match the loop equations of the matrix model. We
conclude by commenting on how to formally obtain the sum over topologies and a
relation to stochastic quantisation.Comment: 15 pages, 2 figures, improved discussion, some new results regarding
  Hausdorff dimension, as publishe
Probing natural SUSY from stop pair production at the LHC

We consider the natural supersymmetry scenario in the framework of the
R-parity conserving minimal supersymmetric standard model (called natural MSSM)
and examine the observability of stop pair production at the LHC. We first scan
the parameters of this scenario under various experimental constraints,
including the SM-like Higgs boson mass, the indirect limits from precision
electroweak data and B-decays. Then in the allowed parameter space we study the
stop pair production at the LHC followed by the stop decay into a top quark
plus a lightest neutralino or into a bottom quark plus a chargino. From
detailed Monte Carlo simulations of the signals and backgrounds, we find the
two decay modes are complementary to each other in probing the stop pair
production, and the LHC with $\sqrt{s}= 14$ TeV and 100 $fb^{-1}$ luminosity is
capable of discovering the stop predicted in natural MSSM up to 450 GeV. If no
excess events were observed at the LHC, the 95% C.L. exclusion limits of the
stop masses can reach around 537 GeV.Comment: 19 pages, 10 figures, version accepted by JHE
Rapid field excursions and the inflationary tensor spectrum

We consider the effects of fields with suddenly changing mass on the
inflationary power spectra. In this context, when a field becomes light, it
will be excited. This process contributes to the tensor power spectrum. We
compute these effects in a gauge-invariant manner, where we use a novel
analytical method for evaluating the corrections to the tensor spectrum due to
these excitations. In the case of a scalar field, we show that the net impact
on the tensors is small as long as the perturbative expansion is valid. Thus,
in these scenarios, measurement of tensor modes is still in one-to-one
correspondence with the Hubble scale
Diffusion constant of supercharge density in N=4 SYM at finite chemical
  potential

We compute holographically the diffusion constant of supercharges in N=4 SYM
at finite chemical potential for the R-charge, by solving the equations of
motion for the transverse mode of the gravitino in the STU black hole in 5
dimensions. We consider the case of one charge and three charges, and we
present analytical solutions for small values of the charges and numerical
solutions for arbitrary values. We compare our results with other known results
in 4 dimensions.Comment: 20 pages, 4 figures; v2: typos correcte
Holographic Reconstruction and Renormalization in Asymptotically
  Ricci-flat Spacetimes

In this work we elaborate on an extension of the AdS/CFT framework to a
subclass of gravitational theories with vanishing cosmological constant. By
building on earlier ideas, we construct a correspondence between Ricci-flat
spacetimes admitting asymptotically hyperbolic hypersurfaces and a family of
conformal field theories on a codimension two manifold at null infinity. By
truncating the gravity theory to the pure gravitational sector, we find the
most general spacetime asymptotics, renormalize the gravitational action,
reproduce the holographic stress tensors and Ward identities of the family of
CFTs and show how the asymptotics is mapped to and reconstructed from conformal
field theory data. In even dimensions, the holographic Weyl anomalies identify
the bulk time coordinate with the spectrum of central charges with
characteristic length the bulk Planck length. Consistency with locality in the
bulk time direction requires a notion of locality in this spectrum.Comment: 44 pages, 4 figures. v2: minor changes in section
Finite Strings From Non-Chiral Mumford Forms

We show that there is an infinite class of partition functions with
world-sheet metric, space-time coordinates and first order systems, that
correspond to volume forms on the moduli space of Riemann surfaces and are free
of singularities at the Deligne-Mumford boundary. An example is the partition
function with 4=2(c_2+c_3+c_4-c_5) space-time coordinates, a $b$-$c$ system of
weight 3, one of weight 4 and a beta-gamma system of weight 5. Such partition
functions are derived from the mapping of the Mumford forms to non-factorized
scalar forms on M_g introduced in arXiv:1209.6049.Comment: 12 pp. More results, references adde
General Lagrangian of Non-Covariant Self-dual Gauge Field

We present the general formulation of non-covariant Lagrangian of self-dual
gauge theory. After specifying the parameters therein the previous Lagrangian
in the decomposition of spacetime into $6=D_1+D_2$ and $6=D_1+D_2+D_3$ can be
obtained. The self-dual property of the general Lagrangian is proved in detail.
We furthermore show that the new non-covariant actions give field equations
with 6d Lorentz invariance. The method can be straightforward extended to any
dimension and we also give a short discussion about the 10D self-dual gauge
theory.Comment: Latex 20 pages. Typos corrected. arXiv admin note: substantial text
  overlap with arXiv:1111.511
Moduli Spaces of Cold Holographic Matter

We use holography to study (3+1)-dimensional N=4 supersymmetric Yang-Mills
theory with gauge group SU(Nc), in the large-Nc and large-coupling limits,
coupled to a single massless (n+1)-dimensional hypermultiplet in the
fundamental representation of SU(Nc), with n=3,2,1. In particular, we study
zero-temperature states with a nonzero baryon number charge density, which we
call holographic matter. We demonstrate that a moduli space of such states
exists in these theories, specifically a Higgs branch parameterized by the
expectation values of scalar operators bilinear in the hypermultiplet scalars.
At a generic point on the Higgs branch, the R-symmetry and gauge group are
spontaneously broken to subgroups. Our holographic calculation consists of
introducing a single probe Dp-brane into AdS5 times S^5, with p=2n+1=7,5,3,
introducing an electric flux of the Dp-brane worldvolume U(1) gauge field, and
then obtaining explicit solutions for the worldvolume fields dual to the scalar
operators that parameterize the Higgs branch. In all three cases, we can
express these solutions as non-singular self-dual U(1) instantons in a
four-dimensional space with a metric determined by the electric flux. We
speculate on the possibility that the existence of Higgs branches may point the
way to a counting of the microstates producing a nonzero entropy in holographic
matter. Additionally, we speculate on the possible classification of
zero-temperature, nonzero-density states described holographically by probe
D-branes with worldvolume electric flux.Comment: 56 pages, 8 PDF images, 4 figure
Matrix geometries and Matrix Models

We study a two parameter single trace 3-matrix model with SO(3) global
symmetry. The model has two phases, a fuzzy sphere phase and a matrix phase.
Configurations in the matrix phase are consistent with fluctuations around a
background of commuting matrices whose eigenvalues are confined to the interior
of a ball of radius R=2.0. We study the co-existence curve of the model and
find evidence that it has two distinct portions one with a discontinuous
internal energy yet critical fluctuations of the specific heat but only on the
low temperature side of the transition and the other portion has a continuous
internal energy with a discontinuous specific heat of finite jump. We study in
detail the eigenvalue distributions of different observables.Comment: 20 page
Hyperscaling violation : a unified frame for effective holographic
  theories

We investigate systematic classifications of low energy and lower dimensional
effective holographic theories with Lifshitz and Schr\"odinger scaling
symmetries only using metrics in terms of hyperscaling violation ($\theta$) and
dynamical ($z$) exponents. Their consistent parameter spaces are constrained by
null energy and positive specific heat conditions, whose validity is explicitly
checked against a previously known result. From dimensional reductions of many
microscopic string solutions, we observe the classifications are tied with the
number of scales in the original microscopic theories. Conformal theories do
not generate a nontrivial $\theta$ for a simple sphere reduction. Theories with
Lifshitz scaling with one scale are completely fixed by $\theta$ and $z$, and
have a universal emblackening factor at finite temperature. Dimensional
reduction of intersecting M2-M5 requires, we call, spatial anisotropic
exponents ($\sharp$), along with $z$=1, $\theta$=0, because of another scale.
Theories with Schr\"odinger scaling show similar simple classifications at zero
temperature, while require more care due to an additional parameter being a
thermodynamic variable at finite temperature.Comment: 1+63 pages, 12 figures, v2 : typos corrected, published versio
NNLO phase space master integrals for two-to-one inclusive cross
  sections in dimensional regularization

We evaluate all phase space master integrals which are required for the total
cross section of generic 2 -> 1 processes at NNLO as a series expansion in the
dimensional regulator epsilon. Away from the limit of threshold production, our
expansion includes one order higher than what has been available in the
literature. At threshold, we provide expressions which are valid to all orders
in terms of Gamma functions and hypergeometric functions. These results are a
necessary ingredient for the renormalization and mass factorization of
singularities in 2 -> 1 inclusive cross sections at NNNLO in QCD.Comment: 37 pages, plus 3 ancillary files containing analytic expressions in
  Maple forma
Ultraviolet Completions of Axigluon Models and Their Phenomenological
  Consequences

The CDF and D0 collaborations have observed a forward-backward asymmetry in
t-tbar production at large invariant mass in excess of the standard model
prediction. One explanation involves a heavy color octet particle with axial
vector couplings to quarks (an axigluon). We describe and contrast various
aspects of axigluons obtained from the breaking of a chiral SU(3)_L x SU(3)_R
gauge theory both from the standpoint of a string-inspired field theory and
from a quiver analysis of a local type IIa intersecting brane construction.
Special attention is paid to the additional constraints and issues that arise
from these classes of top-down constructions compared with the more common
effective field theory approach. These include the implications of a
perturbative connection to a large scale; Yukawa couplings, which must be
generated from higher-dimensional operators in many constructions; anomaly
cancellation, in particular the implications of the required exotics for the
axigluon width, perturbativity, and the signatures from exotic decays; the
possibility of family nonuniversality via mirror representations, mixing with
exotics, or additional SU(3) factors; the additional constraints from anomalous
U(1) factors in the string constructions; tadpole cancellation, which implies
new uncolored matter; the prevention of string-scale masses for vector pairs;
and various phenomenological issues involving FCNC, CKM constraints, and the
axigluon coupling strength. It is concluded that the construction of viable
axigluon models from type IIa or similar constructions is problematic and would
require considerable fine tuning, but is not entirely excluded. These
considerations illustrate the importance of top-down constraints on possible
TeV-scale physics, independent of the ultimate explanation of the t-tbar
asymmetry.Comment: 40 pages. v2: references added, typos correcte
Measurement of prompt J/Psi and beauty hadron production cross sections at mid-rapidity in pp collisions at sqrt(s) = 7 TeV

The ALICE experiment at the LHC has studied J/ψ production at mid-rapidity in pp collisions at √s=7 TeV through its electron pair decay on a data sample corresponding to an integrated luminosity L int = 5.6 nb−1. The fraction of J/ψ from the decay of long-lived beauty hadrons was determined for J/ ψ candidates with transverse momentum pt &gt; 1.3 GeV/c and rapidity |y| &lt; 0.9. The cross section for prompt J/ψ mesons, i.e. directly produced J/ψ and prompt decays of heavier charmonium states such as the ψ(2S) and χc resonances, is σprompt J/ ψ (pt &gt; 1.3 GeV/c, |y| &lt; 0.9) = 8.3 ± 0.8 (stat.) ± 1.1 (syst.) +1.5−1.4 (syst. pol.) μb. The cross section for the production of b-hadrons decaying to J/ψ with pt &gt; 1.3 GeV/c and |y| &lt; 0.9 is σJ/ ψ←hB (p t &gt; 1.3 GeV/c, |y| &lt; 0.9) = 1.46 ± 0.38 (stat.) +0.26−0.32 (syst.) μb. The results are compared to QCD model predictions. The shape of the pt and y distributions of b-quarks predicted by perturbative QCD model calculations are used to extrapolate the measured cross section to derive the bbar-b pair total cross section and dσ/dy at mid-rapidity
On the breaking of collinear factorization in QCD

We investigate the breakdown of collinear factorization for non-inclusive
observables in hadron-hadron collisions. For pure QCD processes, factorization
is violated at the three-loop level and it has a structure identical to that
encountered previously in the case of super-leading logarithms. In particular,
it is driven by the non-commutation of Coulomb/Glauber gluon exchanges with
other soft exchanges. Beyond QCD, factorization may be violated at the two-loop
level provided that the hard subprocess contains matrix element contributions
with phase differences between different colour topologies.Comment: Version 2: minor improvements for journal publicatio
Measurement of the production cross section in the dilepton channel in pp collisions at \sqrt{s} =7 TeV

The tt− production cross section (σtt−) is measured in proton-proton collisions at s√=7 TeV in data collected by the CMS experiment, corresponding to an integrated luminosity of 2.3 fb−1. The measurement is performed in events with two leptons (electrons or muons) in the final state, at least two jets identified as jets originating from b quarks, and the presence of an imbalance in transverse momentum. The measured value of σtt− for a top-quark mass of 172.5 GeV is 161.9±2.5(stat.)+5.1−5.0(syst.)±3.6(lumi.)pb , consistent with the prediction of the standard model
Physics reach of CERN-based SuperBeam neutrino oscillation experiments

We compare the physics potential of two representative options for a
SuperBeam in Europe, studying the achievable precision at 1\sigma with which
the CP violation phase (\delta) could be measured, as well as the mass
hierarchy and CP violation discovery potentials. The first setup corresponds to
a high energy beam aiming from CERN to a 100 kt liquid argon detector placed at
the Pyh\"asalmi mine (2300 km), one of the LAGUNA candidate sites. The second
setup corresponds to a much lower energy beam, aiming from CERN to a 500 kt
water \v{C}erenkov detector placed at the Gran Sasso underground laboratory
(730 km). This second option is also studied for a baseline of 650 km,
corresponding to the LAGUNA candidate sites of Umbria and the Canfranc
underground laboratory. All results are presented also for scenarios with
statistics lowered by factors of 2, 4, 8 and 16 to study the possible
reductions of flux, detector mass or running time allowed by the large value of
\theta_{13} recently measured.Comment: 15 pages, 4 figure
QCD threshold corrections for gluino pair production at hadron colliders

We present the complete threshold enhanced predictions in QCD for the total
cross section of gluino pair production at hadron colliders at
next-to-next-to-leading order. Thanks to the computation of the required
one-loop hard matching coefficients our results are accurate to the
next-to-next-to-leading logarithm. In a brief phenomenological study we provide
predictions for the total hadronic cross sections at the LHC and we discuss the
uncertainties arising from scale variations and the parton distribution
functions.Comment: 25 pages, 7 figures, 5 tables, v2: references added, figures added,
  expanded discussion of the hadronic cross section, typo in eq. (B.4)
  correcte
Stable non-uniform black strings below the critical dimension

The higher-dimensional vacuum Einstein equation admits translationally
non-uniform black string solutions. It has been argued that infinitesimally
non-uniform black strings should be unstable in 13 or fewer dimensions and
otherwise stable. We construct numerically non-uniform black string solutions
in 11, 12, 13, 14 and 15 dimensions. Their stability is investigated using
local Penrose inequalities. Weakly non-uniform solutions behave as expected.
However, in 12 and 13 dimensions, strongly non-uniform solutions appear to be
stable and can have greater horizon area than a uniform string of the same
mass. In 14 and 15 dimensions all non-uniform black strings appear to be
stable.Comment: 26 pages, 11 figures. V2: reference added, matches published versio
Abelian-Higgs and Vortices from ABJM: towards a string realization of
  AdS/CMT

We present ans\"{a}tze that reduce the mass-deformed ABJM model to gauged
Abelian scalar theories, using the fuzzy sphere matrices $G^\alpha$. One such
reduction gives a Toda system, for which we find a new type of nonabelian
vortex. Another gives the standard Abelian-Higgs model, thereby allowing us to
embed all the usual (multi-)vortex solutions of the latter into the ABJM model.
By turning off the mass deformation at the level of the reduced model, we can
also continuously deform to the massive $\phi^4$ theory in the massless ABJM
case. In this way we can embed the Landau-Ginzburg model into the AdS/CFT
correspondence as a consistent truncation of ABJM. In this context, the mass
deformation parameter $\mu$ and a field VEV $<\phi>$ act as $g$ and $g_c$
respectively, leading to a well-motivated AdS/CMT construction from string
theory. To further this particular point, we propose a simple model for the
condensed matter field theory that leads to an approximate description for the
ABJM abelianization. Finally, we also find some BPS solutions to the
mass-deformed ABJM model with a spacetime interpretation as an M2-brane ending
on a spherical M5-brane.Comment: 43 pages, latex, explanations added in the introduction, end of
  section 4, and on page 2