pinecone/core-2020-05-10-deduplication huggingface dataset:
Twisted mass chiral perturbation theory for 2+1+1 quark flavours

We present results for the masses of pseudoscalar mesons in twisted mass
lattice QCD with a degenerate doublet of u and d quarks and a non-degenerate
doublet of s and c quarks in the framework of next-to-leading order chiral
perturbation theory, including lattice effects up to O(a^2). The masses depend
on the two twist angles for the light and heavy sectors. For maximal twist in
both sectors, O(a)-improvement is explicitly exhibited. The mixing of
flavour-neutral mesons is also discussed, and results in the literature for the
case of degenerate s and c quarks are corrected.Comment: LaTeX2e, 12 pages, corrected typo
Dp-branes, NS5-branes and U-duality from nonabelian (2,0) theory with
  Lie 3-algebra

We derive the super Yang-Mills action of Dp-branes on a torus T^{p-4} from
the nonabelian (2,0) theory with Lie 3-algebra. Our realization is based on Lie
3-algebra with pairs of Lorentzian metric generators. The resultant theory then
has negative norm modes, but it results in a unitary theory by setting VEV's of
these modes. This procedure corresponds to the torus compactification,
therefore by taking a transformation which is equivalent to T-duality, the
Dp-brane action is obtained. We also study type IIA/IIB NS5-brane and
Kaluza-Klein monopole systems by taking other VEV assignments. Such various
compactifications can be realized in the nonabelian (2,0) theory, since both
longitudinal and transverse directions can be compactified, which is different
from the BLG theory. We finally discuss U-duality among these branes, and show
that most of the moduli parameters in U-duality group are recovered. Especially
in D5-brane case, the whole U-duality relation is properly reproduced.Comment: 1+26 page
Holographic flows to IR Lifshitz spacetimes

Recently we studied `vanishing' horizon limits of `boosted' black D3-brane
geometry \cite{hsnr}. The type IIB solutions obtained by taking these special
double limits were found to describe nonrelativistic Lifshitz spacetimes at
zero temperature. In the present work we study these limits for TsT black-hole
solutions which include $B$-field. The new Galilean solutions describe a
holographic RG flow from Schr\"odinger ($a=2$) spacetime in UV to a Lifshitz
universe ($a=3$) in the IR.Comment: 10 pages; v2: A bad typo in eq.8 corrected; v3: Discussion and
  reference on Kaigorodov spaces included, correction in sec-3, to be published
  in JHE
The Backreaction of Anti-M2 Branes on a Warped Stenzel Space

We find the superpotential governing the supersymmetric warped M-theory
solution with a transverse Stenzel space found by Cvetic, Gibbons, Lu and Pope
in hep-th/0012011, and use this superpotential to extract and solve the twelve
coupled equations underlying the first-order backreacted solution of a stack of
anti-M2 branes in this space. These anti-M2 branes were analyzed recently in a
probe approximation by Klebanov and Pufu, who conjectured that they should be
dual to a metastable vacuum of a supersymmetric 2+1 dimensional theory. We find
that the would-be supergravity dual to such a metastable vacuum must have an
infrared singularity and discuss whether this singularity is acceptable or not.
Given that a similar singularity appears when placing anti-D3 branes in the
Klebanov-Strassler solution, our work strengthens the possibility that
anti-branes in warped throats do not give rise to metastable vacua.Comment: 28 pages, LaTe
Heavy flavour kinetic equilibration in the confined phase

By making use of a non-perturbative definition of a momentum diffusion
coefficient as well as Heavy Meson Chiral Perturbation Theory, we investigate
the Brownian motion and kinetic equilibration of heavy quark flavours deep in
the confined phase. It appears that the momentum diffusion coefficient can be
expressed in terms of known low-energy constants; it increases rapidly at
temperatures above 50 MeV, behaving as ~ T^7/F_pi^4 for m_pi / pi << T << F_pi,
where m_pi and F_pi are the pion mass and decay constant, respectively. The
early increase may suggest a broad peak in kappa/T^3 around the QCD crossover.
For a more detailed understanding the computation could be generalized in a
number of ways.Comment: 20 pages. v2: clarifications and a note added; published versio
Technicolor at Criticality

We propose an asymptotically non-free, natural model for dynamical
electro-weak symmetry breaking characterized by the emergence of a weakly
coupled Higgs in the IR regime. Due to the large anomalous dimension of the
Higgs operator, the model is capable of solving the hierarchy problem without
losing the phenomenologically appealing features typical of a weakly coupled
sector. We speculate on the possibility that such a scenario be realized as a
strongly coupled phase of non-supersymmetric non-abelian gauge theories.Comment: 21 pages, 2 figures, version published in JHE
Discriminating Minimal SUGRA and Minimal Gauge Mediation Models at the
  Early LHC

Among various supersymmetric (SUSY) standard models, the gravity mediation
model with a neutralino LSP and the gauge mediation model with a very light
gravitino are attractive from the cosmological view point. These models have
different scales of SUSY breaking and their underlying physics in high energy
is quite different. However, if the sparticles' decay into the gravitino is
prompt in the latter case, their collider signatures can be similar: multiple
jets and missing transverse momentum. In this paper, we study the
discrimination between these models in minimal cases at the LHC based on the
method using the significance variables in several different modes and show the
discrimination is possible at a very early stage after the discovery.Comment: 29 pages, 3 figures, captions improved, typos corrected, appendix
  added, version published in JHE
Inclusive Higgs boson cross-section for the LHC at 8 TeV

We present the inclusive Higgs boson cross-section at the LHC with collision
energy of 8 TeV. Our predictions are obtained using our publicly available
program iHixs which incorporates NNLO QCD corrections and electroweak
corrections. We review the convergence of the QCD perturbative expansion at
this new energy and examine the impact of finite Higgs width effects. We also
study the impact of different parton distribution functions on the
cross-section. We present tables with the cross-section values and estimates
for their uncertainty due to uncalculated higher orders in the perturbative
expansion and parton densities.Comment: 11 pages, 5 figures, 2 table
Integrability of Supergravity Black Holes and New Tensor Classifiers of
  Regular and Nilpotent Orbits

In this paper we apply in a systematic way a previously developed integration
algorithm of the relevant Lax equation to the construction of spherical
symmetric, asymptotically flat black hole solutions of N=2 supergravities with
symmetric Special Geometry. Our main goal is the classification of these
black-holes according to the H*-orbits in which the space of possible Lax
operators decomposes, H* being the isotropy group of scalar manifold
originating from time-like dimensional reduction of supergravity from D=4 to
D=3 dimensions. The main result of our investigation is the construction of
three universal tensors, extracted from quadratic and quartic powers of the Lax
operator, that are capable of classifying both regular and nilpotent H* orbits
of Lax operators. Our tensor based classification is compared, in the case of
the simple one-field model S^3, to the algebraic classification of nilpotent
orbits and it is shown to provide a simple and practical discriminating method.
We present a detailed analysis of the S^3 model and its black hole solutions,
discussing the Liouville integrability of the corresponding dynamical system.
By means of the Kostant-representation of a generic Lie algebra element, we
were able to develop an algorithm which produces the necessary number of
hamiltonians in involution required by Liouville integrability of generic
orbits. The degenerate orbits correspond to extremal black-holes and are
nilpotent. We analyze these orbits in some detail working out different
representatives thereof and showing that the relation between H* orbits and
critical points of the geodesic potential is not one-to-one. Finally we present
the conjecture that our newly identified tensor classifiers are universal and
able to label all regular and nilpotent orbits in all homogeneous symmetric
Special Geometries.Comment: Analysis of nilpotent orbits in terms of tensor classifiers in
  section 8.1 corrected. Table 1 corrected. Discussion in section 11 extende
Gauge and Supersymmetric Invariance of a Boundary
  Bagger-Lambert-Gustavsson Theory

In this paper we will discuss the effect of a having a boundary on the
supersymmetric invariance and gauge invariance of the Bagger-Lambert-Gustavsson
(BLG) Theory. We will show that even though the supersymmetry and gauge
invariance of the original BLG theory is broken due to the presence of a
boundary, it restored by the addition of suitable boundary terms. In fact, to
achieve the gauge invariance of this theory, we will have to introduce new
boundary degrees of freedom. The boundary theory obeyed by these new boundary
degrees of freedom will be shown to be a generalization of the gauged
Wess-Zumino-Witten model, with the generators of the Lie algebra replaced by
the generators of the Lie 3-algebra. The gauge and supersymmetry variations of
the boundary theory will exactly cancel the boundary terms generated by the
gauge and supersymmetric variations of the bulk theory.Comment: 15 pages, 0 figures, accepted for publication in JHE
Vacuum stability, neutrinos, and dark matter

Motivated by the discovery hint of the Standard Model (SM) Higgs mass around
125 GeV at the LHC, we study the vacuum stability and perturbativity bounds on
Higgs scalar of the SM extensions including neutrinos and dark matter (DM).
Guided by the SM gauge symmetry and the minimal changes in the SM Higgs
potential we consider two extensions of neutrino sector (Type-I and Type-III
seesaw mechanisms) and DM sector (a real scalar singlet (darkon) and minimal
dark matter (MDM)) respectively. The darkon contributes positively to the
$\beta$ function of the Higgs quartic coupling $\lambda$ and can stabilize the
SM vacuum up to high scale. Similar to the top quark in the SM we find the
cause of instability is sensitive to the size of new Yukawa couplings between
heavy neutrinos and Higgs boson, namely, the scale of seesaw mechanism. MDM and
Type-III seesaw fermion triplet, two nontrivial representations of $SU(2)_{L}$
group, will bring the additional positive contributions to the gauge coupling
$g_{2}$ renormalization group (RG) evolution and would also help to stabilize
the electroweak vacuum up to high scale.Comment: 18 pages, 15 figures; published versio
The Effective Field Theory of Multifield Inflation

We generalize the Effective Field Theory of Inflation to include additional
light scalar degrees of freedom that are in their vacuum at the time the modes
of interest are crossing the horizon. In order to make the scalars light in a
natural way we consider the case where they are the Goldstone bosons of a
global symmetry group or are partially protected by an approximate
supersymmetry. We write the most general Lagrangian that couples the scalar
mode associated to the breaking of time translation during inflation to the
additional light scalar fields. This Lagrangian is constrained by
diffeomorphism invariance and the additional symmetries that keep the new
scalars light. This Lagrangian describes the fluctuations around the time of
horizon crossing and it is supplemented with a general parameterization
describing how the additional fluctuating fields can affect cosmological
perturbations. We find that multifield inflation can reproduce the
non-Gaussianities that can be generated in single field inflation but can also
give rise to new kinds of non-Gaussianities. We find several new three-point
function shapes. We show that in multifield inflation it is possible to
naturally suppress the three-point function making the four-point function the
leading source of detectable non-Gaussianities. We find that under certain
circumstances, i.e. if specific shapes of non-Gaussianities are detected in the
data, one could distinguish between single and multifield inflation and
sometimes even among the various mechanisms that kept the additional fields
light.Comment: 62 pages, 1 figure; v2: JHEP published version, minor corrections,
  comments and references adde
On Classical Equivalence Between Noncritical and Einstein Gravity : The
  AdS/CFT Perspectives

We find that noncritical gravity, a special class of higher derivative
gravity, is classically equivalent to Einstein gravity at the full nonlinear
level. We obtain the viscosity-to-entropy ratio and the second order transport
coefficients of the dual fluid of noncritical gravity to all orders in the
coupling of higher derivative terms. We also compute the holographic
entanglement entropy in the dual CFT of noncritical gravity. All these results
confirm the nonlinear equivalence between noncritical gravity and Einstein
gravity at the classical level.Comment: 19 pages, no figure
Causality and the AdS Dirichlet problem

The (planar) AdS Dirichlet problem has previously been shown to exhibit
superluminal hydrodynamic sound modes. This problem is defined by bulk
gravitational dynamics with Dirichlet boundary conditions imposed on a rigid
timelike cut-off surface. We undertake a careful examination of this set-up and
argue that, in most cases, the propagation of information between points on the
Dirichlet hypersurface is nevertheless causal with respect to the induced light
cones. In particular, the high-frequency dynamics is causal in this sense.
There are however two exceptions and both involve boundary gravitons whose
propagation is not constrained by the Einstein equations. These occur in i)
AdS$_3$, where the boundary gravitons generally do not respect the induced
light cones on the boundary, and ii) Rindler space, where they are related to
the infinite speed of sound in incompressible fluids. We discuss implications
for the fluid/gravity correspondence with rigid Dirichlet boundaries and for
the black hole membrane paradigm.Comment: 29 pages, 5 figures. v2: added refs. v3: minor clarification
2d affine XY-spin model/ 4d gauge theory duality and deconfinement

We introduce a duality between two-dimensional XY-spin models with
symmetry-breaking perturbations and certain four-dimensional SU(2)and SU(2)/Z_2
gauge theories, compactified on a small spatial circle R^(1,2) x S^1, and
considered at temperatures near the deconfinement transition. In a Euclidean
set up, the theory is defined on R^2 x T^2. Similarly, thermal gauge theories
of higher rank are dual to new families of "affine" XY-spin models with
perturbations. For rank two, these are related to models used to describe the
melting of a 2d crystal with a triangular lattice. The connection is made
through a multi-component electric-magnetic Coulomb gas representation for both
systems. Perturbations in the spin system map to topological defects in the
gauge theory, such as monopole-instantons or magnetic bions, and the vortices
in the spin system map to the electrically charged W-bosons in field theory (or
vice versa, depending on the duality frame). The duality permits one to use the
two-dimensional technology of spin systems to study the thermal deconfinement
and discrete chiral transitions in four-dimensional SU(N) gauge theories with
n_f >=1 adjoint Weyl fermions.Comment: 61 pages, 5 figures; typos corrected; published versio
Self-duality of the D1-D5 near-horizon

We explore fermionic T-duality and self-duality in the geometry AdS3 x S3 x
T4 in type IIB supergravity. We explicitly construct the Killing spinors and
the fermionic T-duality isometries and show that the geometry is self-dual
under a combination of two bosonic AdS3 T-dualities, four fermionic T-dualities
and either two additional T-dualities along T4 or two T-dualities along S3. In
addition, we show that the presence of a B-field acts as an obstacle to
self-duality, a property attributable to S- duality and fermionic T-duality not
commuting. Finally, we argue that fermionic T-duality may be extended to CY2 =
K3, a setting where we cannot explicitly construct the Killing spinors.Comment: 24 pages, references added, changes made to reinforce the point that
  S-duality and fermionic T-duality generically do not commute, version
  accepted to JHE
New Physics Models of Direct CP Violation in Charm Decays

In view of the recent LHCb measurement of Delta A_CP, the difference between
the time-integrated CP asymmetries in D --> K+K- and D --> pi+pi- decays, we
perform a comparative study of the possible impact of New Physics degrees of
freedom on the direct CP asymmetries in singly Cabibbo suppressed D meson
decays. We systematically discuss scenarios with a minimal set of new degrees
of freedom that have renormalizable couplings to the SM particles and that are
heavy enough such that their effects on the D meson decays can be described by
local operators. We take into account both constraints from low energy flavor
observables, in particular D0-D0bar mixing, and from direct searches. While
models that explain the large measured value for Delta A_CP with chirally
enhanced chromomagnetic penguins are least constrained, we identify a few
viable models that contribute to the D meson decays at tree level or through
loop induced QCD penguins. We emphasize that such models motivate direct
searches at the LHC.Comment: 24 pages, 13 figures. v2: typos corrected, reference added, published
  versio
Hepta-Cuts of Two-Loop Scattering Amplitudes

We present a method for the computation of hepta-cuts of two loop scattering
amplitudes. Four dimensional unitarity cuts are used to factorise the integrand
onto the product of six tree-level amplitudes evaluated at complex momentum
values. Using Gram matrix constraints we derive a general parameterisation of
the integrand which can be computed using polynomial fitting techniques. The
resulting expression is further reduced to master integrals using conventional
integration by parts methods. We consider both planar and non-planar topologies
for 2 to 2 scattering processes and apply the method to compute hepta-cut
contributions to gluon-gluon scattering in Yang-Mills theory with adjoint
fermions and scalars.Comment: 37 pages, 6 figures. version 2 : minor updates, published versio
Is $Z_b(10610)$ a Molecular State?

Whether molecular states indeed exist in nature has been disputed for a long
time. Several new resonances have been observed in the recent experiments and
they seem to be of exotic structures and some of them have been proposed to be
molecular states. The very recent observation of $Z_b(10610)[(10608.4\pm 2.0)$
MeV] and $Z_b(10650)[(10653.2\pm 1.5)$ MeV] encourages the interpretation of
multi-quark states. In the Beter-Salpeter (BS) approach, we study the
possibility if two heavy mesons can form a molecular state by exchanging light
mesons. Our results indicate that two heavy mesons can form an isospin singlet
(I=0) bound state but cannot form an isospin triplet (I=1) when the
contribution of $\sigma-$ exchange is reasonably small, i.e. as the coupling of
$\sigma$ with mesons $g_{\sigma}$ takes the value given in previous
literatures. Thus we conclude that the newly observed $Z_b(10610)$ should not
be a molecular state, but a tetraquark state instead, at most, the fraction of
the molecular state in the physical resonance $Z_b(10610)$ is tiny.Comment: 15 pages, 2 figures, an important reference added; Accepted by JHE
Supersymmetry of a different kind

Valenzuela, M (Valenzuela, Mauricio). Univ Talca, Inst Matemat & Fis, Talca, ChileA local supersymmetric action for a (2+1)-dimensional system including gravity, the electromagnetic field and a Dirac spin-1/2 field is presented. The action is a Chern-Simons form for a connection of the OSp(2|2) group. All the fields enter as parts of the connection, that transforms in the adjoint representation of the gauge group. The system is off-shell invariant under local (gauge) supersymmetry. Although the supersymmetry is locally realized, there is no spin-3/2 gravitino, and is therefore not supergravity. The fields do not necessarily form supersymmetric doublets of equal mass, and moreover, the fermion may acquire mass through the coupling with geometry, while the bosons - the U(1) field and the spin connection - remain massless
LHC Signatures of Two-Higgs-Doublets with Fourth Family

On-going Higgs searches in the light mass window are of vital importance for
testing the Higgs mechanism and probing new physics beyond the standard model
(SM). The latest ATLAS and CMS searches for the SM Higgs boson at the LHC
(7TeV) found some intriguing excesses of events in the \gamma\gamma/VV^*
channels (V=Z,W) around the mass-range of 124-126 GeV. We explore a possible
explanation of the \gamma\gamma and VV^* signals from the light CP-odd Higgs
A^0 or CP-even Higgs h^0 from the general two-Higgs-doublet model with
fourth-family fermions. We demonstrate that by including invisible decays of
the Higgs boson A^0 or h^0 to fourth-family neutrinos, the predicted
\gamma\gamma and VV^* signals can explain the observed new signatures at the
LHC, and will be further probed by the forthcoming LHC runs in 2012.Comment: 22pp, 10 Figs, JHEP published version, references adde
Modified Signals for Supersymmetry in the NMSSM with a Singlino-like LSP

In the framework of the NMSSM with a singlino-like LSP, we study
quantitatively the impact of the additional bino -> singlino cascade on the
efficiencies in several search channels for supersymmetry of the ATLAS and CMS
collaborations. Compared to the MSSM, the additional cascade reduces the
missing transverse energy, but leads to additional jets or leptons. For the
NMSSM benchmark lines which generalize cMSSM benchmark points, the efficiencies
in the most relevant 2/3 jet + missing energy search channels can drop by
factors ~1/3 to ~1/7, and can reduce the present lower bounds on M_{1/2} by as
much as ~0.9 - 0.75 in the NMSSM for large bino-singlino mass differences. The
larger efficiencies in multijet or multilepton search channels are not strong
enough to affect this conclusion. In the fully constrained cNMSSM, sparticle
decay cascades via the lightest stau can lead to signal cross sections in
multilepton and 2tau search channels which are potentially visible at the LHC
with 7 TeV center of mass energy.Comment: 24 pages, 9 Figures, misprint in Table 1 correcre
On "New Massive" 4D Gravity

We construct a four-dimensional (4D) gauge theory that propagates, unitarily,
the five polarization modes of a massive spin-2 particle. These modes are
described by a "dual" graviton gauge potential and the Lagrangian is 4th-order
in derivatives. As the construction mimics that of 3D "new massive gravity", we
call this 4D model (linearized) "new massive dual gravity". We analyse its
massless limit, and discuss similarities to the Eddington-Schroedinger model.Comment: 17 pages, v2 : version published in JHE
What if the Higgs couplings to W and Z bosons are larger than in the
  Standard Model?

We derive a general sum rule relating the Higgs coupling to W and Z bosons to
the total cross section of longitudinal gauge boson scattering in I=0,1,2
isospin channels. The Higgs coupling larger than in the Standard Model implies
enhancement of the I=2 cross section. Such an enhancement could arise if the
Higgs sector is extended by an isospin-2 scalar multiplet including a doubly
charged, singly charged, and another neutral Higgs.Comment: 11 pages, no figures. v2: comments and references added. v3: early
  QCD references adde