pinecone/core-2020-05-10-deduplication huggingface dataset:
Towards Field Theory Amplitudes From the Cohomology of Pure Spinor
  Superspace

A simple BRST-closed expression for the color-ordered super-Yang-Mills
5-point amplitude at tree-level is proposed in pure spinor superspace and shown
to be BRST-equivalent to the field theory limit of the open superstring 5-pt
amplitude. It is manifestly cyclic invariant and each one of its five terms can
be associated to the five Feynman diagrams which use only cubic vertices. Its
form also suggests an empirical method to find superspace expressions in the
cohomology of the pure spinor BRST operator for higher-point amplitudes based
on their kinematic pole structure. Using this method, Ansaetze for the 6- and
7-point 10D super-Yang-Mills amplitudes which map to their 14 and 42
color-ordered diagrams are conjectured and their 6- and 7-gluon expansions are
explicitly computed.Comment: 14 pages, harvmac, v4: trivial edits in the text to comply with JHEP
  refere
Production of Light Higgs Pairs in 2-Higgs Doublet Models via the
  Higgs-strahlung Process at the LHC

At the Large Hadron Collider, we prove the feasibility to detect pair
production of the lightest CP-even Higgs boson h of a Type II 2-Higgs Doublet
Model through the process q \bar q' --> Vhh (Higgs-strahlung, V=W+-,Z), in
presence of two h --> b \bar b decays. We also show that, through such
production and decay channels, one has direct access to the following Higgs
self-couplings, thus enabling one to distinguish between a standard and the
Supersymmetric version of the above model: lambda_(Hhh) -- which constrains the
form of the Higgs potential -- as well as lambda_(W+- H+- h) and lambda_(Z A h)
-- which are required by gauge invariance. Unfortunately, such claims cannot be
extended to the Minimal Supersymmetric Standard Model, where the extraction of
the same signals is impossible.Comment: Extended discussion at the end of Sect. 3.2. Results unchanged.
  Version to appear on JHE
Rotating black holes with equal-magnitude angular momenta in d=5
  Einstein-Gauss-Bonnet theory

We construct rotating black hole solutions in Einstein-Gauss-Bonnet theory in
five spacetime dimensions. These black holes are asymptotically flat, and
possess a regular horizon of spherical topology and two equal-magnitude angular
momenta associated with two distinct planes of rotation. The action and global
charges of the solutions are obtained by using the quasilocal formalism with
boundary counterterms generalized for the case of Einstein-Gauss-Bonnet theory.
We discuss the general properties of these black holes and study their
dependence on the Gauss-Bonnet coupling constant $\alpha$. We argue that most
of the properties of the configurations are not affected by the higher
derivative terms. For fixed $\alpha$ the set of black hole solutions terminates
at an extremal black hole with a regular horizon, where the Hawking temperature
vanishes and the angular momenta attain their extremal values. The domain of
existence of regular black hole solutions is studied. The near horizon geometry
of the extremal solutions is determined by employing the entropy function
formalism.Comment: 25 pages, 7 figure
Tinkertoys for Gaiotto Duality

We describe a procedure for classifying N=2 superconformal theories of the
type introduced by Davide Gaiotto. Any curve, C, on which the 6D A_{N-1} SCFT
is compactified, can be decomposed into 3-punctured spheres, connected by
cylinders. We classify the spheres, and the cylinders that connect them. The
classification is carried out explicitly, up through N=5, and for several
families of SCFTs for arbitrary N. These lead to a wealth of new S-dualities
between Lagrangian and non-Lagrangian N=2 SCFTs.Comment: 61 pages, 136 figures (a veritable comic book). V2: Grotty bitmapped
  figures replaced with PDF versions; a couple of references fixe
High-energy string-brane scattering: leading eikonal and beyond

We extend previous techniques for calculations of transplanckian-energy
string-string collisions to the high-energy scattering of massless closed
strings from a stack of N Dp-branes in Minkowski spacetime. We show that an
effective non-trivial metric emerges from the string scattering amplitudes by
comparing them against the semiclassical dynamics of high-energy strings in the
extremal p-brane background. By changing the energy, impact parameter and
effective open string coupling, we are able to explore various interesting
regimes and to reproduce classical expectations, including tidal-force
excitations, even beyond the leading-eikonal approximation.Comment: 40 pages, 5 figures, v2: minor corrections, new appendix with a
  discussion of the Feynman diagrams contributing to the scattering amplitude
  in the field theory limi
Jet Shapes and Jet Algorithms in SCET

Jet shapes are weighted sums over the four-momenta of the constituents of a
jet and reveal details of its internal structure, potentially allowing
discrimination of its partonic origin. In this work we make predictions for
quark and gluon jet shape distributions in N-jet final states in e+e-
collisions, defined with a cone or recombination algorithm, where we measure
some jet shape observable on a subset of these jets. Using the framework of
Soft-Collinear Effective Theory, we prove a factorization theorem for jet shape
distributions and demonstrate the consistent renormalization-group running of
the functions in the factorization theorem for any number of measured and
unmeasured jets, any number of quark and gluon jets, and any angular size R of
the jets, as long as R is much smaller than the angular separation between
jets. We calculate the jet and soft functions for angularity jet shapes \tau_a
to one-loop order (O(alpha_s)) and resum a subset of the large logarithms of
\tau_a needed for next-to-leading logarithmic (NLL) accuracy for both cone and
kT-type jets. We compare our predictions for the resummed \tau_a distribution
of a quark or a gluon jet produced in a 3-jet final state in e+e- annihilation
to the output of a Monte Carlo event generator and find that the dependence on
a and R is very similar.Comment: 62 pages plus 21 pages of Appendices, 13 figures, uses JHEP3.cls. v2:
  corrections to finite parts of NLO jet functions, minor changes to plots,
  clarified discussion of power corrections. v3: Journal version. Introductory
  sections significantly reorganized for clarity, classification of logarithmic
  accuracy clarified, results for non-Mercedes-Benz configurations adde
Singlet Portal to the Hidden Sector

Ultraviolet physics typically induces a kinetic mixing between gauge singlets
which is marginal and hence non-decoupling in the infrared. In singlet
extensions of the minimal supersymmetric standard model, e.g. the
next-to-minimal supersymmetric standard model, this furnishes a well motivated
and distinctive portal connecting the visible sector to any hidden sector which
contains a singlet chiral superfield. In the presence of singlet kinetic
mixing, the hidden sector automatically acquires a light mass scale in the
range 0.1 - 100 GeV induced by electroweak symmetry breaking. In theories with
R-parity conservation, superparticles produced at the LHC invariably cascade
decay into hidden sector particles. Since the hidden sector singlet couples to
the visible sector via the Higgs sector, these cascades necessarily produce a
Higgs boson in an order 0.01 - 1 fraction of events. Furthermore,
supersymmetric cascades typically produce highly boosted, low-mass hidden
sector singlets decaying visibly, albeit with displacement, into the heaviest
standard model particles which are kinematically accessible. We study
experimental constraints on this broad class of theories, as well as the role
of singlet kinetic mixing in direct detection of hidden sector dark matter. We
also present related theories in which a hidden sector singlet interacts with
the visible sector through kinetic mixing with right-handed neutrinos.Comment: 12 pages, 5 figure
Form factors at strong coupling via a Y-system

We compute form factors in planar N=4 Super Yang-Mills at strong coupling.
Namely we consider the overlap between an operator insertion and 2n gluons.
Through the gauge/string duality these are given by minimal surfaces in AdS
space. The surfaces end on an infinite periodic sequence of null segments at
the boundary of AdS. We consider surfaces that can be embedded in AdS_3. We
derive set of functional equations for the cross ratios as functions of the
spectral parameter. These equations are of the form of a Y-system. The integral
form of the Y-system has Thermodynamics Bethe Ansatz form. The area is given by
the free energy of the TBA system or critical value of Yang-Yang functional. We
consider a restricted set of operators which have small conformal dimension
An M Theory Solution to the Strong CP Problem and Constraints on the
  Axiverse

We give an explicit realization of the "String Axiverse" discussed in
Arvanitaki et. al \cite{Arvanitaki:2009fg} by extending our previous results on
moduli stabilization in $M$ theory to include axions. We extend the analysis of
\cite{Arvanitaki:2009fg} to allow for high scale inflation that leads to a
moduli dominated pre-BBN Universe. We demonstrate that an axion which solves
the strong-CP problem naturally arises and that both the axion decay constants
and GUT scale can consistently be around $2\times 10^{16}$ GeV with a much
smaller fine tuning than is usually expected. Constraints on the Axiverse from
cosmological observations, namely isocurvature perturbations and tensor modes
are described. Extending work of Fox et. al \cite{Fox:2004kb}, we note that
{\it the observation of tensor modes at Planck will falsify the Axiverse
completely.} Finally we note that Axiverse models whose lightest axion has mass
of order $10^{-15}$ eV and with decay constants of order $5\times 10^{14}$ GeV
require no (anthropic) fine-tuning, though standard unification at $10^{16}$
GeV is difficult to accommodate.Comment: 16 pages, 8 figures, v2 References adde
Thermal photons in QGP and non-ideal effects

We investigate the thermal photon production-rates using one dimensional
boost-invariant second order relativistic hydrodynamics to find proper time
evolution of the energy density and the temperature. The effect of
bulk-viscosity and non-ideal equation of state are taken into account in a
manner consistent with recent lattice QCD estimates. It is shown that the
\textit{non-ideal} gas equation of state i.e $\epsilon-3\,P\,\neq 0$ behaviour
of the expanding plasma, which is important near the phase-transition point,
can significantly slow down the hydrodynamic expansion and thereby increase the
photon production-rates. Inclusion of the bulk viscosity may also have similar
effect on the hydrodynamic evolution. However the effect of bulk viscosity is
shown to be significantly lower than the \textit{non-ideal} gas equation of
state. We also analyze the interesting phenomenon of bulk viscosity induced
cavitation making the hydrodynamical description invalid. We include the
viscous corrections to the distribution functions while calculating the photon
spectra. It is shown that ignoring the cavitation phenomenon can lead to
erroneous estimation of the photon flux.Comment: 11 pages, 13 figures; accepted for publication in JHE
Renormalization factors of quark bilinears using the DCI operator with
  dynamical quarks

Non-perturbative renormalization factors of bilinear quark operators are
computed for the Chirally Improved lattice action with two dynamic quarks. The
analysis is based on five different parameter sets with lattice size 12^3 x 24
and four parameter sets with lattice size 16^3 x 32. For the pseudoscalar
renormalization factor the pion pole contribution is subtracted and chiral
extrapolations are performed. Results are given in RIprime- and MSbar-scheme as
well as in RGI-form.Comment: 23 pages, JHEP style, 8 tables, 9 figures; updated version as
  publishe
The Dark Side of the Electroweak Phase Transition

Recent data from cosmic ray experiments may be explained by a new GeV scale
of physics. In addition the fine-tuning of supersymmetric models may be
alleviated by new O(GeV) states into which the Higgs boson could decay. The
presence of these new, light states can affect early universe cosmology. We
explore the consequences of a light (~ GeV) scalar on the electroweak phase
transition. We find that trilinear interactions between the light state and the
Higgs can allow a first order electroweak phase transition and a Higgs mass
consistent with experimental bounds, which may allow electroweak baryogenesis
to explain the cosmological baryon asymmetry. We show, within the context of a
specific supersymmetric model, how the physics responsible for the first order
phase transition may also be responsible for the recent cosmic ray excesses of
PAMELA, FERMI etc. We consider the production of gravity waves from this
transition and the possible detectability at LISA and BBO
Higher Order Power Corrections in Inclusive B Decays

We discuss order 1/m_b^4 and 1/m_b^5 corrections in inclusive semileptonic
decay of a $B$ meson. We identify relevant hadronic matrix elements of
dimension seven and eight and estimate them using the ground-state saturation
approximation. Within this approach the effects on the integrated rate and on
kinematic moments are estimated. The overall relative shift in V_{cb} turns out
about +0.4% as applied to the existing fits. Similar estimates are presented
for B -> X_s+\gamma decays.Comment: 30 pages, 16 figure
Rare Z-decay into light CP-odd Higgs bosons: a comparative study in
  different new physics models

Various new physics models predict a light CP-odd Higgs boson (labeled as
$a$) and open up new decay modes for Z-boson, such as $Z \to \bar{f} f a$,
$Z\to a\gamma$ and $Z\to aaa$, which could be explored at the GigaZ option of
the ILC. In this work we investigate these rare decays in several new physics
models, namely the type-II two Higgs doublet model (type-II 2HDM), the
lepton-specific two Higgs doublet model (L2HDM), the nearly minimal
supersymetric standard model (nMSSM) and the next-to-minimal supersymmetric
standard model (NMSSM). We find that in the parameter space allowed by current
experiments, the branching ratios can reach $10^{-4}$ for $Z \to \bar{f} f a $
($f=b,\tau$), $10^{-9}$ for $Z\to a\gamma$ and $10^{-3}$ for $Z\to aaa$, which
implies that the decays $Z \to \bar{f} f a$ and $Z \to a a a$ may be accessible
at the GigaZ option. Moreover, since different models predict different
patterns of the branching ratios, the measurement of these rare decays at the
GigaZ may be utilized to distinguish the models.Comment: Version in JHEP (discussions added, errors corrected
On the perturbative S-matrix of generalized sine-Gordon models

Motivated by its relation to the Pohlmeyer reduction of AdS_5 x S^5
superstring theory we continue the investigation of the generalized sine-Gordon
model defined by SO(N+1)/SO(N) gauged WZW theory with an integrable potential.
Extending our previous work (arXiv:0912.2958) we compute the one-loop
two-particle S-matrix for the elementary massive excitations. In the N = 2 case
corresponding to the complex sine-Gordon theory it agrees with the charge-one
sector of the quantum soliton S-matrix proposed in hep-th/9410140. In the case
of N > 2 when the gauge group SO(N) is non-abelian we find a curious anomaly in
the Yang-Baxter equation which we interpret as a gauge artifact related to the
fact that the scattered particles are not singlets under the residual global
subgroup of the gauge group
A proposal of a fine tuning free formulation of 4d N=4 super Yang-Mills

Recently, a nonperturbative formulation of 4d N=4 super Yang-Mills theory
which does not require fine tuning at least to all order in perturbation theory
has been proposed by combining two-dimensional lattice and matrix model
techniques. In this paper we provide an analogous model by utilizing
deconstruction approach of Kaplan et al. Two-dimensional lattice with a plane
wave deformation is deconstructed from a matrix model and two additional
dimensions emerge through the Myers effect. In other words we construct a
D1-brane theory from which a D3-brane theory comes out. The action is much
simpler than the previous formulation and hence numerical study, which enables
us to test the AdS/CFT duality at fully nonperturbative level, becomes much
easier.Comment: v1: 16 pages, no figure. v2: 18 pages, no figure. Comments and
  references added. Title changed slightly following the referee's suggestion.
  The version accepted by JHEP. v3: a few sign errors in equations correcte
On BCFW shifts of integrands and integrals

In this article a first step is made towards the extension of
Britto-Cachazo-Feng-Witten (BCFW) tree level on-shell recursion relations to
integrands and integrals of scattering amplitudes to arbitrary loop order.
Surprisingly, it is shown that the large BCFW shift limit of the integrands has
the same structure as the corresponding tree level amplitude in any minimally
coupled Yang-Mills theory in four or more dimensions. This implies that these
integrands can be reconstructed from a subset of their `single cuts'. The main
tool is powercounting Feynman graphs in a special lightcone gauge choice
employed earlier at tree level by Arkani-Hamed and Kaplan. The relation between
shifts of integrands and shifts of its integrals is investigated explicitly at
one loop. Two particular sources of discrepancy between the integral and
integrand are identified related to UV and IR divergences. This is
cross-checked with known results for helicity equal amplitudes at one loop. The
nature of the on-shell residue at each of the single-cut singularities of the
integrand is commented upon. Several natural conjectures and opportunities for
further research present themselves.Comment: 43 pages, 6 figures, v2: minor improvement in exposition, typos
  fixed, bibliography update
Heterotic strings on G_2 orbifolds

We study compactification of heterotic strings to three dimensions on
orbifolds of G_2 holonomy. We consider the standard embedding and show that the
gauge group is broken from E_8 x E_8 or SO(32) to F_4 x E_8 or SO(25)
respectively. We also compute the spectrum of massless states and compare with
the results obtained from reduction of the 10-dimensional fields. Non-standard
embeddings are discussed briefly. For type II compactifications we verify that
IIB and IIA have equal massless spectrum.Comment: LaTex, 21 page
Higher spin interactions with scalar matter on constant curvature
  spacetimes: conserved current and cubic coupling generating functions

Cubic couplings between a complex scalar field and a tower of symmetric
tensor gauge fields of all ranks are investigated on any constant curvature
spacetime of dimension d>2. Following Noether's method, the gauge fields
interact with the scalar field via minimal coupling to the conserved currents.
A symmetric conserved current, bilinear in the scalar field and containing up
to r derivatives, is obtained for any rank r from its flat spacetime
counterpart in dimension d+1, via a radial dimensional reduction valid
precisely for the mass-square domain of unitarity in (anti) de Sitter spacetime
of dimension d. The infinite collection of conserved currents and cubic
vertices are summarized in a compact form by making use of generating functions
and of the Weyl/Wigner quantization on constant curvature spaces.Comment: 35+1 pages, v2: two references added, typos corrected, enlarged
  discussions in Subsection 5.2 and in Conclusion, to appear in JHE
Refined topological amplitudes in N=1 flux compactification

We study the implication of refined topological string amplitudes in the
supersymmetric N=1 flux compactification. They generate higher derivative
couplings among the vector multiplets and graviphoton with generically
non-holomorphic moduli dependence. For a particular term, we can compute them
by assuming the geometric engineering. We claim that the Dijkgraaf-Vafa large N
matrix model with the beta-ensemble measure directly computes the higher
derivative corrections to the supersymmetric effective action of the
supersymmetric N=1$ gauge theory.Comment: 16 pages, v2: reference adde
The Curious Case of Null Warped Space

We initiate a comprehensive study of a set of solutions of topologically
massive gravity known as null warped anti-de Sitter spacetimes. These are
pp-wave extensions of three-dimensional anti-de Sitter space. We first perform
a careful analysis of the linearized stability of black holes in these
spacetimes. We find two qualitatively different types of solutions to the
linearized equations of motion: the first set has an exponential time
dependence, the second - a polynomial time dependence. The solutions polynomial
in time induce severe pathologies and moreover survive at the non-linear level.
In order to make sense of these geometries, it is thus crucial to impose
appropriate boundary conditions. We argue that there exists a consistent set of
boundary conditions that allows us to reject the above pathological modes from
the physical spectrum. The asymptotic symmetry group associated to these
boundary conditions consists of a centrally-extended Virasoro algebra. Using
this central charge we can account for the entropy of the black holes via
Cardy's formula. Finally, we note that the black hole spectrum is chiral and
prove a Birkoff theorem showing that there are no other stationary axisymmetric
black holes with the specified asymptotics. We extend most of the analysis to a
larger family of pp-wave black holes which are related to Schr\"odinger
spacetimes with critical exponent z.Comment: 29 pages + appendices, refs adde
Zero Sound in Effective Holographic Theories

We investigate zero sound in $D$-dimensional effective holographic theories,
whose action is given by Einstein-Maxwell-Dilaton terms. The bulk spacetimes
include both zero temperature backgrounds with anisotropic scaling symmetry and
their near-extremal counterparts obtained in 1006.2124 [hep-th], while the
massless charge carriers are described by probe D-branes. We discuss
thermodynamics of the probe D-branes analytically. In particular, we clarify
the conditions under which the specific heat is linear in the temperature,
which is a characteristic feature of Fermi liquids. We also compute the
retarded Green's functions in the limit of low frequency and low momentum and
find quasi-particle excitations in certain regime of the parameters. The
retarded Green's functions are plotted at specific values of parameters in
$D=4$, where the specific heat is linear in the temperature and the
quasi-particle excitation exists. We also calculate the AC conductivity in
$D$-dimensions as a by-product.Comment: 29 pages, 1 figur
Missing Momentum Reconstruction and Spin Measurements at Hadron
  Colliders

We study methods for reconstructing the momenta of invisible particles in
cascade decay chains at hadron colliders. We focus on scenarios, such as SUSY
and UED, in which new physics particles are pair produced. Their subsequent
decays lead to two decay chains ending with neutral stable particles escaping
detection. Assuming that the masses of the decaying particles are already
measured, we obtain the momenta by imposing the mass-shell constraints. Using
this information, we develop techniques of determining spins of particles in
theories beyond the standard model. Unlike the methods relying on Lorentz
invariant variables, this method can be used to determine the spin of the
particle which initiates the decay chain. We present two complementary ways of
applying our method by using more inclusive variables relying on kinematic
information from one decay chain, as well as constructing correlation variables
based on the kinematics of both decay chains in the same event.Comment: Version to appear in JHE