pinecone/core-2020-05-10-deduplication huggingface dataset:
Wronskian Solution for AdS/CFT Y-system

Using the discrete Hirota integrability we find the general solution of the
full quantum Y-system for the spectrum of anomalous dimensions of operators in
the planar AdS5/CFT4 correspondence in terms of Wronskian-like determinants
parameterized by a finite number of Baxter's Q-functions. We consider it as a
useful step towards the construction of a finite system of non-linear integral
equations (FiNLIE) for the full spectrum. The explicit asymptotic form of all
the Q-functions for the large size operators is presented. We establish the
symmetries and the analyticity properties of the asymptotic Q-functions and
discuss their possible generalization to any finite size operators.Comment: 31 pages, 4 figures, 1 attached mathematica fil
Searching for third-generation composite leptoquarks at the LHC

Fermion masses may arise via mixing of elementary fermions with composite
fermions of a strong sector in scenarios of strongly-coupled electroweak
symmetry breaking. The strong sector may contain leptoquark states with masses
as light as several hundred GeV. In the present study we focus on the scalar
modes of such leptoquarks since their bosonic couplings are determined
completely and hence their production cross sections only depend on their
masses. We study all the possible gauge-invariant non-derivative and
single-derivative couplings of the scalar leptoquarks to the quarks and
leptons, which turn out to be, predominantly, of the third generation. We
examine their phenomenology and outline search strategies for their dominant
decay modes at the LHC.Comment: 37 pages, 20 figures, v3: Added clarifications in response to referee
  comments, v2: Minor misprints corrected and plots replaced to correspond to
  correct helicity configurations for leptoquark decay
Hot Halos and Galactic Glasses (Carbonado)

We initiate a systematic study of the state space of non-extremal, stationary black hole bound states in four-dimensional \(N\) = 2 supergravity. Specifically, we show that an exponential multitude of classically stable "halo" bound states can be formed between large finite temperature D4-D0 black hole cores and much smaller, arbitrarily charged black holes at the same temperature. We map out in full the regions of existence for thermodynamically stable and metastable bound states in terms of the core's charges and temperature, as well as the region of stability of the core itself. Several features of these systems, such as a macroscopic configurational entropy and exponential relaxation timescales, are similar to those of the extended family of glasses. We draw parallels between the two with a view toward understanding complex systems in fundamental physics.Physic
Numerical Hermitian Yang-Mills Connections and Kahler Cone Substructure

We further develop the numerical algorithm for computing the gauge connection
of slope-stable holomorphic vector bundles on Calabi-Yau manifolds. In
particular, recent work on the generalized Donaldson algorithm is extended to
bundles with Kahler cone substructure on manifolds with h^{1,1}>1. Since the
computation depends only on a one-dimensional ray in the Kahler moduli space,
it can probe slope-stability regardless of the size of h^{1,1}. Suitably
normalized error measures are introduced to quantitatively compare results for
different directions in Kahler moduli space. A significantly improved numerical
integration procedure based on adaptive refinements is described and
implemented. Finally, an efficient numerical check is proposed for determining
whether or not a vector bundle is slope-stable without computing its full
connection.Comment: 38 pages, 10 figure
On asymmetric brane creation

We exhaust the brane instanton solutions---an Einstein brane inhabiting at
different positions in a 5-dimensional Einstein bulk with negative curvature.
We construct a brane instanton model consisting of a brane with asymmetric bulk
along two sides of the brane. And the junction condition of the resulting
space-time is analyzed in the frame of induced gravity (DGP model). In spirits
of quantum gravity of path integral formulism we calculate the Euclidean
actions on three canonical paths and then compare the Euclidean actions of
different instantons per unit 4-volume. We also compare the Euclidean actions
per unit 4-volume of instantons, which consist of a brane gluing to a fixed
half, with other Euclidean actions of halves possessing different cosmological
constants.Comment: 20 pages, JHEP in press. It is a significantly improved version of
  hep-th/041231
Lattice QCD determination of m_b, f_B and f_Bs with twisted mass Wilson fermions

We present a lattice QCD determination of the b quark mass and of the B and B s decay constants, performed with N f = 2 twisted mass Wilson fermions, by simulating at four values of the lattice spacing. In order to study the b quark on the lattice, two methods are adopted in the present work, respectively based on suitable ratios with exactly known static limit and on the interpolation between relativistic data, evaluated in the charm mass region, and the static point, obtained by simulating the HQET on the lattice. The two methods provide results in good agreement. For the b quark mass in the \( \overline {\text{MS}} \) scheme and for the decay constants we obtain \( {\overline m_b}\left( {{{\overline m }_b}} \right) \) = 4.29(14) GeV, f B = 195(12) MeV, f Bs = 232(10) MeV and f Bs /f B = 1.19(5). As a byproduct of the analysis we also obtain the results for the f D and f Ds decay constants: f D = 212(8) MeV, f Ds = 248(6) MeV and f Ds /f D = 1.17(5)
Revisiting symmetries of lattice fermions via spin-flavor representation

Employing the spin-flavor representation, we investigate the structures of the doubler-mixing symmetries and the mechanisms of their spontaneous breakdown in four types of lattice fermion formulation. We first revisit the U(4) × U(4) symmetries of the naive fermion with the vanishing bare mass m, and re-express them in terms of the spinflavor representation. We apply the same method to the Wilson fermion, which possesses only the U(1) vector symmetry for general values of m. For a special value of m, however, there emerges an additional U(1) symmetry to be broken by pion condensation. We also explore two types of minimally doubled fermion, and discover a similar kind of symmetry enhancement and its spontaneous breakdown
Gluon mass through ghost synergy

In this work we compute, at the 'one-loop-dressed' level, the nonperturbative contribution of the ghost loops to the self-energy of the gluon propagator, in the Landau gauge. This is accomplished within the PT-BFM formalism, which guarantees the gauge-invariance of the emerging answer. In particular, the contribution of the ghost-loops is automatically transverse, by virtue of the QED-like Ward identities satisfied in this framework. Using as nonperturbative input the available lattice data for the ghost dressing function, we show that the ghost contributions have a rather sizable effect on the overall shape of the gluon propagator, both for d=3,4. Then, by exploiting a recently introduced dynamical equation for the effective gluon mass, whose solutions depend crucially on the characteristics of the gluon propagator at intermediate energies, we show that if the ghost loops are removed from the gluon propagator then the gluon mass vanishes. These findings strongly suggest that, at least at the level of the Schwinger-Dyson equations, the effects of gluons and ghosts are inextricably connected, and must be combined suitably in order to reproduce the results obtained in the recent lattice simulations
Charge asymmetries of top quarks at hadron colliders revisited

A sizeable difference in the differential production cross section of top-compared to antitop-quark production, denoted charge asymittetm has been observed at the Tevatron. The experimental results seem to exceed the theory predictions based on the Standard Model by a significant amount and have triggered a large number of suggestions for ¿new physics'. In the present paper the Standard Model predictions for Tevatron and LHe experiments are revisited. This includes a reanalysis of electromagnetic as well as weak corrections, leading to a shift of the asymmetry by roughly a factor 1.1 when compared to the results of the first papers on this subject. The impact of cuts on the transverse momentum of the top-antitop system is studied. Restricting the it system to a transverse momentum less than 20 GeV leads to an enhancement of the asymmetries by factors between 1.3 and 1.5, indicating the importance of an improved understanding of the tt-momentum distribution. Predictions for similar measurements at the LHC are presented, demonstrating the sensitivity of the large rapidity region bot ti to the Standard Model contribution and effects from ¿new physics'
Ordinary-derivative formulation of conformal low-spin fields

Conformal fields in flat space-time of even dimension greater than or equal
to four are studied. Second-derivative formulation for spin 0,1,2 conformal
bosonic fields and first-derivative formulation for spin 1/2,3/2 conformal
fermionic fields are developed. For the spin 1,3/2,2 conformal fields, we
obtain gauge invariant Lagrangians and the corresponding gauge transformations.
Gauge symmetries are realized by involving Stueckelberg fields and auxiliary
fields. Realization of global conformal boost symmetries is obtained. Modified
Lorentz and de Donder gauge conditions are introduced. Ordinary-derivative
Lagrangian of interacting Weyl gravity in 4d is obtained. In our approach, the
field content of Weyl gravity, in addition to conformal graviton field,
includes one auxiliary rank-2 symmetric tensor field and one Stueckelberg
vector field. With respect to the auxiliary tensor field, the Lagrangian
contains, in addition to other terms, the Pauli-Fierz mass term. Using the
ordinary-derivative Lagrangian of Weyl gravity, we discuss interrelation of
Einstein AdS gravity and Weyl gravity via breaking conformal gauge symmetries.
Also, we demonstrate use of the light-cone gauge for counting on-shell degrees
of freedom in higher-derivative conformal field theories.Comment: 58 pages, LaTeX-2e. v3: Results and conclusions of version v2
  unchanged. New representations for Lagrangian of conformal fields added.
  Appendix C fully rewritten and moved to Sec.6. Discussion of interrelation of
  AdS and Weyl gravities added in Sec.6. Lorentz and de Donder like gauges
  added. Appendices B,D,F and references adde
Notes on the "Ramified" Seiberg-Witten Equations and Invariants

In these notes, we carefully analyze the properties of the "ramified"
Seiberg-Witten equations associated with supersymmetric configurations of the
Seiberg-Witten abelian gauge theory with surface operators on an oriented
closed four-manifold X. We find that in order to have sensible solutions to
these equations, only surface operators with certain parameters and embeddings
in X, are admissible. In addition, the corresponding "ramified" Seiberg-Witten
invariants on X with positive scalar curvature and b^+_2 > 1, vanish, while if
X has b^+_2 = 1, there can be wall-crossings whence the invariants will jump.
In general, for each of the finite number of basic classes that corresponds to
a moduli space of solutions with zero virtual dimension, the perturbed
"ramified" Seiberg-Witten invariants on Kahler manifolds will depend - among
other parameters associated with the surface operator - on the monopole number
"l" and the holonomy parameter "alpha". Nonetheless, the (perturbed) "ramified"
and ordinary invariants are found to coincide, albeit up to a sign, in some
examples.Comment: 21 pages. Published versio
Jet vetoing and Herwig++

We investigate the simulation of events with gaps between jets with a veto on
additional radiation in the gap in Herwig++. We discover that the
currently-used random treatment of radiation in the parton shower is generating
some unphysical behaviour for wide-angle gluon emission in QCD 2 to 2
scatterings. We explore this behaviour quantitatively by making the same
assumptions as the parton shower in the analytical calculation. We then modify
the parton shower algorithm in order to correct the simulation of QCD
radiation.Comment: 18 pages, 11 figure
Holographic Fermi and Non-Fermi Liquids with Transitions in Dilaton
  Gravity

We study the two-point function for fermionic operators in a class of
strongly coupled systems using the gauge-gravity correspondence. The gravity
description includes a gauge field and a dilaton which determines the gauge
coupling and the potential energy. Extremal black brane solutions in this
system typically have vanishing entropy. By analyzing a charged fermion in
these extremal black brane backgrounds we calculate the two-point function of
the corresponding boundary fermionic operator. We find that in some region of
parameter space it is of Fermi liquid type. Outside this region no well-defined
quasi-particles exist, with the excitations acquiring a non-vanishing width at
zero frequency. At the transition, the two-point function can exhibit non-Fermi
liquid behaviour.Comment: 52 pages, 6 figures. v3: Appendix F added showing numerical
  interpolation between the near-horizon region and AdS4. Additional minor
  comments also adde
Dark matter and LHC phenomenology in a left-right supersymmetric model

Left-right symmetric extensions of the Minimal Supersymmetric Standard Model can explain neutrino data and have potentially interesting phenomenology beyond that found in minimal SUSY seesaw models. Here we study a SUSY model in which the left-right symmetry is broken by triplets at a high scale, but significantly below the GUT scale. Sparticle spectra in this model differ from the usual constrained MSSM expectations and these changes affect the relic abundance of the lightest neutralino. We discuss changes for the standard stau (and stop) co-annihilation, the Higgs funnel and the focus point regions. The model has potentially large lepton flavour violation in both, left and right, scalar leptons and thus allows, in principle, also for flavoured co-annihilation. We also discuss lepton flavour signals due to violating decays of the second lightest neutralino at the LHC, which can be as large as 20 fb(-1) at root s = 14 TeV
The Poisson sigma model on closed surfaces

Using methods of formal geometry, the Poisson sigma model on a closed surface is studied in perturbation theory. The effective action, as a function on vacua, is shown to have no quantum corrections if the surface is a torus or if the Poisson structure is regular and unimodular (e.g., symplectic). In the case of a Kähler structure or of a trivial Poisson structure, the partition function on the torus is shown to be the Euler characteristic of the target; some evidence is given for this to happen more generally. The methods of formal geometry introduced in this paper might be applicable to other sigma models, at least of the AKSZ type
Measurement of charm production at central rapidity in proton-proton collisions at sqrt(s) = 7 TeV

The pt-differential inclusive production cross sections of the prompt charmed mesons D0, D+, and D∗+ in the rapidity range |y| &lt; 0.5 were measured in proton-proton collisions at √s = 7 TeV at the LHC using the ALICE detector. Reconstructing the decays D0 → K−π+, D+ → K−π+π+, D∗+ → D0π+, and their charge conjugates, about 8, 400 D0, 2, 900 D+, and 2, 600 D∗+ mesons with 1 &lt; pt &lt; 24 GeV/c were counted, after selection cuts, in a data sample of 3.14×10^8 events collected with a minimum-bias trigger (integrated luminosity Lint = 5 nb−1). The results are described within uncertainties by predictions based on perturbative QCD
On-shell recursion for massive fermion currents

We analyze the validity of BCFW recursion relations for currents of n - 2
gluons and two massive quarks, where one of the quarks is off shell and the
remaining particles are on shell. These currents are gauge-dependent and can be
used as ingredients in the unitarity-based approach to computing one-loop
amplitudes. The validity of BCFW recursion relations is well known to depend on
the so-called boundary behavior of the currents as the momentum shift parameter
goes to infinity. With off-shell currents, a new potential problem arises,
namely unphysical poles that depend on the choice of gauge. We identify
conditions under which boundary terms are absent and unphysical poles are
avoided, so that there is a natural recursion relation. In particular, we are
able to choose a gauge in which we construct a valid shift for currents with at
least n - 3 gluons of the same helicity. We derive an analytic formula in the
case where all gluons have the same helicity. As by-products, we prove the
vanishing boundary behavior of general off-shell objects in Feynman gauge, and
we find a compact generalization of Berends-Giele gluon currents with a generic
reference spinor.Comment: 30 pages, 8 figures; v2 minor corrections, journal versio
Holographic Renormalisation for the Spin-3 Theory and the (A)dS3/CFT2
  correspondence

We compute the two-point correlation functions for the spin-3 theory in three
dimensional (Anti-) de Sitter spacetimes by using holographic renormalisation.
For the AdS case, we find results consistent with the general requirements of
two-dimensional conformal invariance. In the de Sitter case, we find similar
results. We discuss consistency requirements on the three point functions TWW
for our results to be compatible with the asymptotic symmetry algebra for AdS
case and with the de-Sitter central charge found in hep-th/0106113 by analyzing
the stress-tensor. We also discuss why it is very likely that our results are
not compatible with the imaginary central charge previously found for
higher-spin theories in dS(3).Comment: 24 pages, Latex, References added, Version Submitted to JHE
Heterotic wrapping rules

We show that the same wrapping rules that have been derived for the branes of
IIA and IIB string theory also apply to the branes of the toroidally
compactified heterotic string theory. Moreover, we show that applying these
wrapping rules to the IIA theory compactified over K3 is consistent with the
well-known duality between the heterotic string theory compactified over T^4
and the IIA string theory compactified over K3. We derive a simple rule that
relates, in any dimension, the T-duality representation of the branes of the
toroidally compactified heterotic theory to the relevant R-symmetry
representation of the central charges in the supersymmetry algebra. We show
that, in the general case, the degeneracy of the BPS conditions of the
heterotic branes is twice as large as that of the branes of IIA and IIB string
theory.Comment: 47 pages, 4 figures. v2: refs. adde
AMSB and the Logic of Spontaneous SUSY Breaking

A cardinal principle of any theory of spontaneous (${\cal N}=1$)
supersymmetry breaking, is that the order parameter is a linear combination of
the F and D terms. Also as long as the supersymmetry of the action is preserved
at the quantum level, this principle should be valid after the appropriate
corrections are incorporated into the Kaehler potential, the superpotential,
and the gauge coupling functions that define the theory. The claim that in AMSB
there is an extra term for the gaugino mass that is proportional to the
gravitino mass, is then equivalent to the statement that quantum effects cause
an explicit breaking of (local) SUSY. Expanding on previous work, we argue that
this arises from confusing the scalar compensator with the density compensator.
We comment on various recent papers on AMSB.Comment: Typo and citation corrected, version published in JHE
On the Correlations between Flavour Observables in Minimal U(2)^3 Models

The stringent correlations between flavour observables in models with CMFV
are consistent with the present data except for the correlation Delta
M_{s,d}-epsilon_K. Motivated by the recent work of Barbieri et al, we compare
the CMFV correlations with the ones present in a special class of models with
an approximate global U(2)^3 flavour symmetry, constrained by a minimal set of
spurions governing the breakdown of this symmetry and the assumption that only
SM operators are relevant in flavour physics. This analog of CMFV to be called
MU(2)^3 allows to avoid the Delta M_{s,d}-epsilon_K tension in question because
of reduced flavour symmetry and implied non-MFV contributions to Delta M_{s,d}.
While the patterns of flavour violation in K meson system is the same as in
CMFV models, the CP-violation in B_{s,d} meson systems can deviate from the one
in the SM and CMFV models. We point out a stringent triple S_{psi K_S}-S_{psi
phi}-|V_ub| correlation in this class of models that could in the future
provide a transparent distinction between different MU(2)^3 models and in the
context of these models determine |V_ub| by means of precise measurements of
S_{psi K_S} and S_{psi phi} with only small hadronic uncertainties. For fixed
S_{psi K_S} the correlation between B(B^+ -> tau^+nu_tau) and S_{psi phi}
follows. We also find that MU(2)^3 models could in principle accommodate a
negative value of S_{psi phi}, provided |V_ub| is found to be in the ballpark
of exclusive determinations and the particular MU(2)^3 model provides a 25%
enhancement of epsilon_K. A supersymmetric U(2)^3 model worked out in the
Barbieri-School appears to satisfy these requirements. However if B(B^+ ->
tau^+nu_tau)>1.0 10^{-4} will be confirmed by future experiments only positive
S_{psi phi} is allowed in this framework. We summarize briefly the pattern of
flavour violation in rare K and B_{s,d} decays in MU(2)^3 models.Comment: 28 pages, 6 figures; v2: Few references and discussion on CP
  violation in B_s-> mu^+ mu^- added; v3: Several clarifying comments added,
  conclusions unchanged, version accepted for publication in JHE
Geons and Spin-2 Condensates in the AdS Soliton

We construct geons starting with gravitational perturbations of the AdS
soliton. Previous studies of a charged scalar field in the soliton background
showed a holographic insulator/superconductor transition at a critical chemical
potential. We explore the possibility that dimensional reduction of the geon
could model a transition to a d-wave superconductor. We find that although one
does get a charged spin-2 condensate, it has higher free energy than the state
without the condensate, so there is no phase transition.Comment: 12 pages, v2: minor changes to Fig.
A note on the eigenvectors of long-range spin chains and their scalar
  products

In this note, we propose an expression for the eigenvectors and scalar
products for a class of spin chains with long-range interaction and su(2)
symmetry. This class includes the Inozemtsev spin chain as well as the BDS spin
chain, which is a reduction of the one-dimensional Hubbard model at
half-filling to the spin sector. The proposal is valid for large spin chains
and is based on the construction of the monodromy matrix using the Dunkl
operators. For the Inozemtsev model these operators are known explicitly. This
construction gives in particular the eigenvectors of (an operator closely
related to) the dilatation operator of the N=4 gauge theory in the su(2) sector
up to three-loop order, as well as their scalar products. We suggest how this
will affect the expression for the quasi classical limit of the three-point
functions obtained by I. Kostov and how to include the all-loop interaction.Comment: 15 pages, some more typos corrected, published versio