pinecone/core-2020-05-10-deduplication huggingface dataset:
A note on the boundary contribution with bad deformation in gauge theory

Motivated by recently progresses in the study of BCFW recursion relation with
nonzero boundary contributions for theories with scalars and
fermions\cite{Bofeng}, in this short note we continue the study of boundary
contributions of gauge theory with the bad deformation. Unlike cases with
scalars or fermions, it is hard to use Feynman diagrams directly to obtain
boundary contributions, thus we propose another method based on the ${\cal
N}=4$ SYM theory. Using this method, we are able to write down a useful
on-shell recursion relation to calculate boundary contributions from related
theories. Our result shows the cut-constructibility of gauge theory even with
the bad deformation in some generalized sense.Comment: 16 pages, 7 figure
The Impact of a 4th Generation on Mixing and CP Violation in the Charm
  System

We study D0-D0 mixing in the presence of a fourth generation of quarks. In
particular, we calculate the size of the allowed CP violation which is found at
the observable level well beyond anything possible with CKM dynamics. We
calculate the semileptonic asymmetry a_SL and the mixing induced CP asymmetry
eta_fS_f which are correlated with each other. We also investigate the
correlation of eta_fS_f with a number of prominent observables in other mesonic
systems like epsilon'/epsilon, Br(K_L -> pi0 nu nu), Br(K+ -> pi+ nu nu),
Br(B_s ->mu+ mu-), Br(B_d -> mu+ mu-) and finally S_psi phi in the B_s system.
We identify a clear pattern of flavour and CP violation predicted by the SM4
model: While simultaneous large 4G effects in the K and D systems are possible,
accompanying large NP effects in the B_d system are disfavoured. However this
behaviour is not as pronounced as found for the LHT and RSc models. In contrast
to this, sizeable CP violating effects in the B_s system are possible unless
extreme effects in eta_fS_f are found, and Br(B_s ->mu+ mu-) can be strongly
enhanced regardless of the situation in the D system. We find that, on the
other hand, S_psi phi > 0.2 combined with the measured epsilon'/epsilon
significantly diminishes 4G effects within the D system.Comment: 22 pages, 23 figures, v2 (references added
Form factors of descendant operators: $A^{(1)}_{L-1}$ affine Toda theory

In the framework of the free field representation we obtain exact form
factors of local operators in the two-dimensional affine Toda theories of the
$A^{(1)}_{L-1}$ series. The construction generalizes Lukyanov's well-known
construction to the case of descendant operators. Besides, we propose a free
field representation with a countable number of generators for the `stripped'
form factors, which generalizes the recent proposal for the sine/sinh-Gordon
model. As a check of the construction we compare numbers of the operators
defined by these form factors in level subspaces of the chiral sectors with the
corresponding numbers in the Lagrangian formalism. We argue that the
construction provides a correct counting for operators with both chiralities.
At last we study the properties of the operators with respect to the Weyl
group. We show that for generic values of parameters there exist Weyl invariant
analytic families of the bases in the level subspaces.Comment: 26 pages; v2: a misprint corrected; an acknowledgment added; v3:
  minor correction; a reference added; v4: minor correction
Neutrinoless double beta decay in seesaw models

We study the general phenomenology of neutrinoless double beta decay in
seesaw models. In particular, we focus on the dependence of the neutrinoless
double beta decay rate on the mass of the extra states introduced to account
for the Majorana masses of light neutrinos. For this purpose, we compute the
nuclear matrix elements as functions of the mass of the mediating fermions and
estimate the associated uncertainties. We then discuss what can be inferred on
the seesaw model parameters in the different mass regimes and clarify how the
contribution of the light neutrinos should always be taken into account when
deriving bounds on the extra parameters. Conversely, the extra states can also
have a significant impact, cancelling the Standard Model neutrino contribution
for masses lighter than the nuclear scale and leading to vanishing neutrinoless
double beta decay amplitudes even if neutrinos are Majorana particles. We also
discuss how seesaw models could reconcile large rates of neutrinoless double
beta decay with more stringent cosmological bounds on neutrino masses.Comment: 34 pages, 5 eps figures and 1 axodraw figure. Final version published
  in JHEP. NME results available in Appendi
PSU(2,2|4) Character of Quasiclassical AdS/CFT

We solve the recently proposed T- and Y-systems (Hirota equation) for the
exact spectrum of AdS/CFT in the strong coupling scaling limit for an arbitrary
quasiclassical string state. The corresponding T-functions appear to be
super-characters of the SU(2,2|4) group in unitary representations with a
highest weight, with the classical AdS5xS5 superstring monodromy matrix as the
group element. We propose a concise first Weyl-type formula for these
characters and show that they correctly reproduce the results of quasiclassical
one-loop quantization in all sectors of the superstring, under some natural
assumptions. We also speculate about possible relation between the T-functions
and the quantum monodromy matrix.Comment: 40 pages, 6 figures; v2: minor corrections, added a brief discussion
  of the quantum cas
The Benefits of B ---> K* l+ l- Decays at Low Recoil

Using the heavy quark effective theory framework put forward by Grinstein and
Pirjol we work out predictions for B -> K* l+ l-, l = (e, mu), decays for a
softly recoiling K*, i.e., for large dilepton masses sqrt{q^2} of the order of
the b-quark mass m_b. We work to lowest order in Lambda/Q, where Q = (m_b,
sqrt{q^2}) and include the next-to-leading order corrections from the charm
quark mass m_c and the strong coupling at O(m_c^2/Q^2, alpha_s). The leading
Lambda/m_b corrections are parametrically suppressed. The improved Isgur-Wise
form factor relations correlate the B -> K* l+ l- transversity amplitudes,
which simplifies the description of the various decay observables and provides
opportunities for the extraction of the electroweak short distance couplings.
We propose new angular observables which have very small hadronic
uncertainties. We exploit existing data on B -> K* l+ l- distributions and show
that the low recoil region provides powerful additional information to the
large recoil one. We find disjoint best-fit solutions, which include the
Standard Model, but also beyond-the-Standard Model ones. This ambiguity can be
accessed with future precision measurements.Comment: 31 pages, 8 figures; Instability near minimal recoil from numerics
  removed, Fig. 1 replaced and minor shifts in short distance uncertainties in
  SM predictions; typos corrected and references added; main results and
  conclusions unchange
Holographic Superconductors from Einstein-Maxwell-Dilaton Gravity

We construct holographic superconductors from Einstein-Maxwell-dilaton
gravity in 3+1 dimensions with two adjustable couplings $\alpha$ and the charge
$q$ carried by the scalar field. For the values of $\alpha$ and $q$ we
consider, there is always a critical temperature at which a second order phase
transition occurs between a hairy black hole and the AdS RN black hole in the
canonical ensemble, which can be identified with the superconducting phase
transition of the dual field theory. We calculate the electric conductivity of
the dual superconductor and find that for the values of $\alpha$ and $q$ where
$\alpha/q$ is small the dual superconductor has similar properties to the
minimal model, while for the values of $\alpha$ and $q$ where $\alpha/q$ is
large enough, the electric conductivity of the dual superconductor exhibits
novel properties at low frequencies where it shows a "Drude Peak" in the real
part of the conductivity.Comment: 25 pages, 13 figures; v2, typos corrected; v3, refs added, to appear
  in JHE
Direct Detection of Electroweak-Interacting Dark Matter

Assuming that the lightest neutral component in an SU(2)L gauge multiplet is
the main ingredient of dark matter in the universe, we calculate the elastic
scattering cross section of the dark matter with nucleon, which is an important
quantity for the direct detection experiments. When the dark matter is a real
scalar or a Majorana fermion which has only electroweak gauge interactions, the
scattering with quarks and gluon are induced through one- and two-loop quantum
processes, respectively, and both of them give rise to comparable contributions
to the elastic scattering cross section. We evaluate all of the contributions
at the leading order and find that there is an accidental cancellation among
them. As a result, the spin-independent cross section is found to be
O(10^-(46-48)) cm^2, which is far below the current experimental bounds.Comment: 19 pages, 7 figures, published versio
The Kinematic Algebra From the Self-Dual Sector

We identify a diffeomorphism Lie algebra in the self-dual sector of
Yang-Mills theory, and show that it determines the kinematic numerators of
tree-level MHV amplitudes in the full theory. These amplitudes can be computed
off-shell from Feynman diagrams with only cubic vertices, which are dressed
with the structure constants of both the Yang-Mills colour algebra and the
diffeomorphism algebra. Therefore, the latter algebra is the dual of the colour
algebra, in the sense suggested by the work of Bern, Carrasco and Johansson. We
further study perturbative gravity, both in the self-dual and in the MHV
sectors, finding that the kinematic numerators of the theory are the BCJ
squares of the Yang-Mills numerators.Comment: 29 pages, 5 figures. v2: references added, published versio
The Dropping of In-Medium Hadron Mass in Holographic QCD

We study the baryon density dependence of the vector meson spectrum using the
D4/D6 system together with the compact D4 baryon vertex. We find that the
vector meson mass decreases almost linearly in density at low density for small
quark mass, but saturates to a finite non-zero value for large density. We also
compute the density dependence of the $\eta\prime$ mass and the $\eta\prime$
velocity. We find that in medium, our model is consistent with the GMOR
relation up to a few times the normal nuclear density. We compare our hQCD
predictions with predictions made based on hidden local gauge theory that is
constructed to model QCD.Comment: 20 pages, 7 figure
On Non-Linear Actions for Massive Gravity

In this work we present a systematic construction of the potentially
ghost-free non-linear massive gravity actions. The most general action can be
regarded as a 2-parameter deformation of a minimal massive action. Further
extensions vanish in 4 dimensions. The general mass term is constructed in
terms of a "deformed" determinant from which this property can clearly be seen.
In addition, our formulation identifies non-dynamical terms that appear in
previous constructions and which do not contribute to the equations of motion.
We elaborate on the formal structure of these theories as well as some of their
implications.Comment: v3: 22 pages, minor comments added, version to appear in JHE
Light Higgsinos as Heralds of Higher-Dimensional Unification

Grand-unified models with extra dimensions at the GUT scale will typically
contain exotic states with Standard Model charges and GUT-scale masses. They
can act as messengers for gauge-mediated supersymmetry breaking. If the number
of messengers is sizeable, soft terms for the visible sector fields will be
predominantly generated by gauge mediation, while gravity mediation can induce
a small mu parameter. We illustrate this hybrid mediation pattern with two
examples, in which the superpartner spectrum contains light and near-degenerate
higgsinos with masses below 200 GeV. The typical masses of all other
superpartners are much larger, from at least 500 GeV up to several TeV. The
lightest superparticle is the gravitino, which may be the dominant component of
dark matter.Comment: 21 pages, 2 figures; v2: reference adde
A natural little hierarchy for RS from accidental SUSY

We use supersymmetry to address the little hierarchy problem in
Randall-Sundrum models by naturally generating a hierarchy between the IR scale
and the electroweak scale. Supersymmetry is broken on the UV brane which
triggers the stabilization of the warped extra dimension at an IR scale of
order 10 TeV. The Higgs and top quark live near the IR brane whereas light
fermion generations are localized towards the UV brane. Supersymmetry breaking
causes the first two sparticle generations to decouple, thereby avoiding the
supersymmetric flavour and CP problems, while an accidental R-symmetry protects
the gaugino mass. The resulting low-energy sparticle spectrum consists of
stops, gauginos and Higgsinos which are sufficient to stabilize the little
hierarchy between the IR scale and the electroweak scale. Finally, the
supersymmetric little hierarchy problem is ameliorated by introducing a singlet
Higgs field on the IR brane.Comment: 37 pages, 3 figures; v2: minor corrections, version published in JHE
Light Neutralino in the MSSM: a playground for dark matter, flavor
  physics and collider experiments

We investigate the constraints to the light neutralino dark matter scenario
in the minimal supersymmetric standard model from available experimental
observations such as decays of B and K meson, relic dark matter abundance, and
the search for neutralino and Higgs production at colliders. We find that two
regions of the MSSM parameter space fulfill all the constraints: a fine-tuned
strip with large tan beta where the lightest neutralino can be as light as 8
GeV, and a low tan beta region providing a neutralino mass larger than 16 GeV.
The large tan beta strip, which can be compatible with recently reported
signals from direct detection experiments, can be fully tested by means of
low-energy observables and, in particular, by B_s -> mu mu and Higgs bosons
searches at the LHC within the upcoming months.Comment: 25 pages, 9 figures; discussion improved, typos corrected, references
  added; version accepted for publication in JHE
The static-light baryon spectrum from twisted mass lattice QCD

We compute the static-light baryon spectrum by means of Wilson twisted mass
lattice QCD using N_f = 2 flavors of sea quarks. As light u/d valence quarks we
consider quarks, which have the same mass as the sea quarks with corresponding
pion masses in the range 340 MeV < m_PS < 525 MeV, as well as partially
quenched s quarks, which have a mass around the physical value. We consider all
possible combinations of two light valence quarks, i.e. Lambda, Sigma, Xi and
Omega baryons corresponding to isospin I = 0, 1/2, 1 and strangeness S = 0, -1,
-2 as well as angular momentum of the light degrees of freedom j = 0, 1 and
parity P = +, -. We extrapolate in the light u/d and in the heavy b quark mass
to the physical point and compare with available experimental results. Besides
experimentally known positive parity states we are also able to predict a
number of negative parity states, which have neither been measured in
experiments nor previously been computed by lattice methods.Comment: 28 pages, 6 figure
Complete resummation of chirally-enhanced loop-effects in the MSSM with
  non-minimal sources of flavor-violation

In this article we present the complete resummation of the leading
chirally-enhanced corrections stemming from gluino-squark, chargino-sfermion
and neutralino-sfermion loops in the MSSM with non-minimal sources of
flavor-violation. We compute the finite renormalization of fermion masses and
the CKM matrix induced by chirality-flipping self-energies. In the decoupling
limit Msusy>>v, which is an excellent approximation to the full theory, we give
analytic results for the effective gaugino(higgsino)-fermion-sfermion and the
Higgs-fermion-fermion vertices. Using these vertices as effective Feynman
rules, all leading chirally-enhanced corrections can consistently be included
into perturbative calculations of Feynman amplitudes. We also give a
generalized parametrization for the bare CKM matrix which extends the classic
Wolfenstein parametrization to the case of complex parameters lambda and A.Comment: 31 pages, 3 figures; typos correcte
Vector boson pair production at the LHC

We present phenomenological results for vector boson pair production at the
LHC, obtained using the parton-level next-to-leading order program MCFM. We
include the implementation of a new process in the code, pp -> \gamma\gamma,
and important updates to existing processes. We incorporate fragmentation
contributions in order to allow for the experimental isolation of photons in
\gamma\gamma, W\gamma, and Z\gamma production and also account for gluon-gluon
initial state contributions for all relevant processes. We present results for
a variety of phenomenological scenarios, at the current operating energy of
\sqrt{s} = 7 TeV and for the ultimate machine goal, \sqrt{s} = 14 TeV. We
investigate the impact of our predictions on several important distributions
that enter into searches for new physics at the LHC.Comment: 35 pages, 14 figure
Rotating BPS black holes in matter-coupled AdS(4) supergravity

Using the general recipe given in arXiv:0804.0009, where all timelike
supersymmetric solutions of N=2, D=4 gauged supergravity coupled to abelian
vector multiplets were classified, we construct genuine rotating supersymmetric
black holes in AdS(4) with nonconstant scalar fields. This is done for the
SU(1,1)/U(1) model with prepotential F=-iX^0X^1. In the static case, the black
holes are uplifted to eleven dimensions, and generalize the solution found in
hep-th/0105250 corresponding to membranes wrapping holomorphic curves in a
Calabi-Yau five-fold. The constructed rotating black holes preserve one quarter
of the supersymmetry, whereas their near-horizon geometry is one half BPS.
Moreover, for constant scalars, we generalize (a supersymmetric subclass of)
the Plebanski-Demianski solution of cosmological Einstein-Maxwell theory to an
arbitrary number of vector multiplets. Remarkably, the latter turns out to be
related to the dimensionally reduced gravitational Chern-Simons action.Comment: 23 pages, uses JHEP3.cl
Symmetry and Mass Degeneration in Multi-Higgs-Doublet Models

We investigate possible symmetry properties of the scalar sector of
Multi-Higgs-Doublet Models, and, to some extent, the generalization of such
models to gauge groups other than $SU(2)_L\times U(1)_Y$. In models where the
${\cal C}$ (charge conjugation) violating operator $\hat{C}$ is not present,
the scalar potential is invariant under a group larger than the gauge group,
O(4) when the Higgs fields are doublets. If the Higgs fields develop aligned
vacuum expectation values, this symmetry will break to an O(3) subgroup, which
in general is further broken by loop corrections involving the gauge bosons.
Assuming such corrections are small, the physical properties of the Higgs
sector will approximately organize into representations of SO(3). If the vacuum
expectation values of the Higgs fields are aligned in the direction of the
${\cal C}$ even fields, the mass spectra of the charged and ${\cal C}$ odd
sectors will be degenerate. Moreover, if the Higgs fields develop a pair of
non-aligned vacuum expectations values, so that the charge conjugation symmetry
is spontaneously broken (but not the U(1) electromagnetic gauge invariance), a
pair of light charged Higgs bosons should appear.Comment: 20 pages. v2 matches published JHEP versio
A Non-Abelian Self-Dual Gauge Theory in 5+1 Dimensions

We construct a non-Abelian gauge theory of chiral 2-forms (self-dual gauge
fields) in 6 dimensions with a spatial direction compactified on a circle of
radius R. It has the following two properties. (1) It reduces to the Yang-Mills
theory in 5 dimensions for small R. (2) It is equivalent to the
Lorentz-invariant theory of Abelian chiral 2-forms when the gauge group is
Abelian. Previous no-go theorems prohibiting non-Abelian deformations of the
chiral 2-form gauge theory are circumvented by introducing nonlocality along
the compactified dimension.Comment: 23 pages, reference adde
Closed String Cohomology in Open String Field Theory

We show that closed string states in bosonic string field theory are encoded
in the cyclic cohomology of cubic open string field theory (OSFT) which, in
turn, classifies the deformations of OSFT. This cohomology is then shown to be
independent of the open string background. Exact elements correspond to closed
string gauge transformations, generic boundary deformations of Witten's
3-vertex and infinitesimal shifts of the open string background. Finally it is
argued that the closed string cohomology and the cyclic cohomology of OSFT are
isomorphic to each other.Comment: 21 pages + appendix, 7 figure
Effective Conformal Theory and the Flat-Space Limit of AdS

We develop the idea of an effective conformal theory describing the low-lying
spectrum of the dilatation operator in a CFT. Such an effective theory is
useful when the spectrum contains a hierarchy in the dimension of operators,
and a small parameter whose role is similar to that of 1/N in a large N gauge
theory. These criteria insure that there is a regime where the dilatation
operator is modified perturbatively. Global AdS is the natural framework for
perturbations of the dilatation operator respecting conformal invariance, much
as Minkowski space naturally describes Lorentz invariant perturbations of the
Hamiltonian. Assuming that the lowest-dimension single-trace operator is a
scalar, O, we consider the anomalous dimensions, gamma(n,l), of the
double-trace operators of the form O (del^2)^n (del)^l O. Purely from the CFT
we find that perturbative unitarity places a bound on these dimensions of
|gamma(n,l)|<4. Non-renormalizable AdS interactions lead to violations of the
bound at large values of n. We also consider the case that these interactions
are generated by integrating out a heavy scalar field in AdS. We show that the
presence of the heavy field "unitarizes" the growth in the anomalous
dimensions, and leads to a resonance-like behavior in gamma(n,l) when n is
close to the dimension of the CFT operator dual to the heavy field. Finally, we
demonstrate that bulk flat-space S-matrix elements can be extracted from the
large n behavior of the anomalous dimensions. This leads to a direct connection
between the spectrum of anomalous dimensions in d-dimensional CFTs and
flat-space S-matrix elements in d+1 dimensions. We comment on the emergence of
flat-space locality from the CFT perspective.Comment: 46 pages, 2 figures. v2: JHEP published versio
Non-Relativistic Fluid Dual to Asymptotically AdS Gravity at Finite
  Cutoff Surface

Using the non-relativistic hydrodynamic expansion, we solve equations of
motion for Einstein gravity and Gauss-Bonnet gravity with a negative
cosmological constant within the region between a finite cutoff surface and a
black brane horizon, up to the second order of the expansion parameter. Through
the Brown-York tensor, we calculate the stress energy tensor of dual fluids
living on the cutoff surface. With the black brane solutions, we show that for
both Einstein gravity and Gauss-Bonnet gravity, the ratio of shear viscosity to
entropy ensity of dual fluid does not run with the cutoff surface. The
incompressible Navier-Stokes equations are also obtained in both cases.Comment: 17 pages, minor revision to appear in JHE