pinecone/core-2020-05-10-deduplication huggingface dataset:
Probing CP Violation with and without Momentum Reconstruction at the LHC

We study the potential to observe CP-violating effects in SUSY cascade decay
chains at the LHC. We consider squark and gluino production followed by
subsequent decays into neutralinos with a three-body leptonic decay in the
final step. Asymmetries composed by triple products of momenta of the final
state particles are sensitive to CP-violating effects. Due to large boosts
these asymmetries can be difficult to observe at a hadron collider. We show
that using all available kinematic information one can reconstruct the decay
chains on an event-by-event basis even in the case of 3-body decays, neutrinos
and LSPs in the final state. We also discuss the most important experimental
effects like major backgrounds and momentum smearing due to finite detector
resolution. We show that with 300 fb$^{-1}$ of collected data, CP violation may
be discovered at the LHC for a wide range of the phase of the bino mass
parameter $M_1$.Comment: Version accepted for publication in JHEP. Clarifications added on the
  assumptions used for plots. New references adde
Simplifying the Tree-level Superstring Massless Five-point Amplitude

We use the pure spinor formalism to obtain the supersymmetric massless
five-point amplitude at tree-level in a streamlined fashion. We also prove the
equivalence of an OPE identity in string theory with a subset of the
Bern-Carrasco-Johansson five-point kinematic relations, and demonstrate how the
remaining BCJ identities follow from the different integration regions over the
open string world-sheet, therefore providing a first principles derivation of
the (supersymmetric) BCJ identities.Comment: 19 pages, harvmac TeX, v2: Fix and add references, fix typos and add
  (3.16
Noncommuting Coordinates and Magnetic Monopoles

The appearance of noncommuting spatial coordinates is studied in quantum
systems containing a magnetic monopole and under the influence of a radial
potential. We derive expressions for the commutators of the coordinates that
have been restricted to the lowest energy level. Quantum corrections are found
to previous results by Frenkel and Pereira based on quantizing the Dirac
brackets of the classical theory. For two different potentials, the modified
harmonic oscillator potential and the modified Coulomb potential, we also
calculate the commutators for a projection to a fixed energy level.Comment: 8 pages, Late
Solving the Topological String on K3 Fibrations

We present solutions of the holomorphic anomaly equations for compact
two-parameter Calabi-Yau manifolds which are hypersurfaces in weighted
projective space. In particular we focus on K3-fibrations where due to
heterotic type II duality the topological invariants in the fibre direction are
encoded in certain modular forms. The formalism employed provides holomorphic
expansions of topological string amplitudes everywhere in moduli space.Comment: 60 pages, 1 figure, With an appendix by Sheldon Kat
Covariant representation theory of the Poincar\'e algebra and some of
  its extensions

There has been substantial calculational progress in the last few years for
gauge theory amplitudes which involve massless four dimensional particles. One
of the central ingredients in this has been the ability to keep precise track
of the Poincare algebra quantum numbers of the particles involved. Technically,
this is most easily done using the well-known four dimensional spinor helicity
method. In this article a natural generalization to all dimensions higher than
four is obtained based on a covariant version of the representation theory of
the Poincare algebra. Covariant expressions for all possible polarization
states, both bosonic and fermionic, are constructed. For the fermionic states
the analysis leads directly to pure spinors. The natural extension to the
representation theory of the on-shell supersymmetry algebra results in an
elementary derivation of the supersymmetry Ward identities for scattering
amplitudes with massless or massive legs in any integer dimension from four
onwards. As a proof-of-concept application a higher dimensional analog of the
vanishing helicity-equal amplitudes in four dimensions is presented in (super)
Yang-Mills theory, Einstein (super-)gravity and superstring theory in a flat
background.Comment: 46 pages, 3 figures, expanded discussion of gauge versus little group
  transformations, references added, published versio
Moduli Stabilisation in Heterotic Models with Standard Embedding

In this note we analyse the issue of moduli stabilisation in 4d models
obtained from heterotic string compactifications on manifolds with SU(3)
structure with standard embedding. In order to deal with tractable models we
first integrate out the massive fields. We argue that one can not only
integrate out the moduli fields, but along the way one has to truncate also the
corresponding matter fields. We show that the effective models obtained in this
way do not have satisfactory solutions. We also look for stabilised vacua which
take into account the presence of the matter fields. We argue that this also
fails due to a no-go theorem for Minkowski vacua in the moduli sector which we
prove in the end. The main ingredient for this no-go theorem is the constraint
on the fluxes which comes from the Bianchi identity.Comment: 20 pages, LaTeX; references adde
Flux moduli stabilisation, Supergravity algebras and no-go theorems

We perform a complete classification of the flux-induced 12d algebras
compatible with the set of N=1 type II orientifold models that are T-duality
invariant, and allowed by the symmetries of the T^6/(Z_2 x Z_2) isotropic
orbifold. The classification is performed in a type IIB frame, where only H_3
and Q fluxes are present. We then study no-go theorems, formulated in a type
IIA frame, on the existence of Minkowski/de Sitter (Mkw/dS) vacua. By deriving
a dictionary between the sources of potential energy for the three moduli (S, T
and U) in types IIA and IIB, we are able to combine algebra results and no-go
theorems. The outcome is a systematic procedure for identifying
phenomenologically viable models where Mkw/dS vacua may exist. We present a
complete table of the allowed algebras and the viability of their resulting
scalar potential, and we point at the models which stand any chance of
producing a fully stable vacuum.Comment: Version published in JHE
Combination of electroweak and QCD corrections to single W production at
  the Fermilab Tevatron and the CERN LHC

Precision studies of the production of a high-transverse momentum lepton in
association with missing energy at hadron colliders require that electroweak
and QCD higher-order contributions are simultaneously taken into account in
theoretical predictions and data analysis. Here we present a detailed
phenomenological study of the impact of electroweak and strong contributions,
as well as of their combination, to all the observables relevant for the
various facets of the $p\smartpap \to {\rm lepton} + X$ physics programme at
hadron colliders, including luminosity monitoring and Parton Distribution
Functions constraint, $W$ precision physics and search for new physics signals.
We provide a theoretical recipe to carefully combine electroweak and strong
corrections, that are mandatory in view of the challenging experimental
accuracy already reached at the Fermilab Tevatron and aimed at the CERN LHC,
and discuss the uncertainty inherent the combination. We conclude that the
theoretical accuracy of our calculation can be conservatively estimated to be
about 2% for standard event selections at the Tevatron and the LHC, and about
5% in the very high $W$ transverse mass/lepton transverse momentum tails. We
also provide arguments for a more aggressive error estimate (about 1% and 3%,
respectively) and conclude that in order to attain a one per cent accuracy: 1)
exact mixed ${\cal O}(\alpha \alpha_s)$ corrections should be computed in
addition to the already available NNLO QCD contributions and two-loop
electroweak Sudakov logarithms; 2) QCD and electroweak corrections should be
coherently included into a single event generator.Comment: One reference added. Final version to appear in JHE
Hints of Integrability Beyond the Planar Limit: Nontrivial Backgrounds

The problem of computing the anomalous dimensions of a class of (nearly)
half-BPS operators with a large R-charge is reduced to the problem of
diagonalizing a Cuntz oscillator chain. Due to the large dimension of the
operators we consider, non-planar corrections must be summed to correctly
construct the Cuntz oscillator dynamics. These non-planar corrections do not
represent quantum corrections in the dual gravitational theory, but rather,
they account for the backreaction from the heavy operator whose dimension we
study. Non-planar corrections accounting for quantum corrections seem to spoil
integrability, in general. It is interesting to ask if non-planar corrections
that account for the backreaction also spoil integrability. We find a limit in
which our Cuntz chain continues to admit extra conserved charges suggesting
that integrability might survive.Comment: 25+1 pages; references added; v3: minor changes, references adde
D-brane Inspired Fermion Mass Textures

In this paper, the issues of the quark mass hierarchies and the Cabbibo Kobayashi Maskawa mixing are analyzed in a class of intersecting D-brane configurations with Standard Model gauge symmetry. The relevant mass matrices are constructed taking into account the constraints imposed by extra abelian symmetries and anomaly cancelation conditions. Possible mass generating mechanisms including perturbative as well as non-perturbative effects are discussed and specific patterns of mass textures are found characterized by the hierarchies of the scales where the various sources contribute. It is argued that the Cholesky decomposition of the mass matrices is the most appropriate way to determine the properties of these fermion mass patterns, while the associated triangular mass matrix form provides a unified description of all phenomenologically equivalent symmetric and non-symmetric mass matrices. An elegant analytic formula is derived for the Cholesky triangular form of the mass matrices where the entries are given as simple functions of the mass eigenstates and the diagonalizing transformation entries. Finally, motivated by the possibility of vanishing zero Yukawa mass entries in several D-brane and F-theory constructions due to the geometry of the internal space, we analyse in detail all possible texture-zeroes mass matrices within the proposed new context. These new texture-zeroes are compared to those existing in the literature w hile D-brane inspired cases are worked out in detail
Non-unitary Leptonic Mixing and Leptogenesis

We investigate the relation between non-unitarity of the leptonic mixing
matrix and leptogenesis. We discuss how all parameters of the canonical type-I
seesaw mechanism can, in principle, be reconstructed from the neutrino mass
matrix and the deviation of the effective low-energy leptonic mixing matrix
from unitary. When the mass M' of the lightest right-handed neutrino is much
lighter than the masses of the others, we show that its decay asymmetries
within flavour-dependent leptogenesis can be expressed in terms of two
contributions, one depending on the unique dimension five (d=5) operator
generating neutrino masses and one depending on the dimension six (d=6)
operator associated with non-unitarity. In low-energy seesaw scenarios where
small lepton number violation explains the smallness of neutrino masses, the
lepton number conserving d=6 operator contribution generically dominates over
the d=5 operator contribution which results in a strong enhancement of the
flavour-dependent decay asymmetries without any resonance effects. To calculate
the produced final baryon asymmetry, the flavour equilibration effects directly
related to non-unitarity have to be taken into account. In a simple realization
of this non-unitarity driven leptogenesis, the lower bound on M' is found to be
about 10^8 GeV at the onset of the strong washout regime, more than one order
of magnitude below the bound in "standard" thermal leptogenesis.Comment: 19 pages, REVTeX4, 2 eps and 2 axodraw figure
Transport Coefficients at Zero Temperature from Extremal Black Holes

Using the AdS/CFT correspondence we study transport coefficients of a
strongly-coupled (2 +1)-dimensional field theory at {\it zero} temperature and
finite charge density. The field theory under consideration is dual to the
extremal Reissner-Nordstrom AdS_4 black hole in the bulk. We show that, like
the cases of scalar and spinor operators studied in \cite{Faulkner:2009wj}, the
correlators of charge (vector) current and energy-momentum (tensor) operators
exhibit scaling behavior at low frequency. The existence of such low frequency
behavior is related to the fact that the near-horizon geometry of the extremal
black hole background has an AdS_2 factor. We carefully calculate the shear
viscosity (at zero temperature) and show that the ratio of the shear viscosity
to the entropy density takes the value of 1/4\pi. Because of the AdS_2 factor,
we argue that this result stays the same for all d-dimensional boundary field
theories dual to the extremal Reissner-Nordstrom AdS_{d+1} black holes. Also,
we compute the charge conductivity at zero temperature. The limiting behavior
of the conductivity for small frequencies is also attributed to the near
horizon AdS_2 factor and is argued to hold regardless of the dimension of the
zero-temperature boundary field theory. Finally, using the extremal dyonic
AdS_4 black hole as the background, we extract the conductivity in the presence
of a constant magnetic field.Comment: 22 page
BCFW Recursion Relation with Nonzero Boundary Contribution

The appearance of BCFW on-shell recursion relation has deepen our
understanding of quantum field theory, especially the one with gauge boson and
graviton. To be able to write the BCFW recursion relation, the knowledge of
boundary contributions is needed. So far, most applications have been
constrained to the cases where the boundary contribution is zero. In this
paper, we show that for some theories, although there is no proper deformation
to annihilate the boundary contribution, its effects can be analyzed in simple
way, thus we do able to write down the BCFW recursion relation with boundary
contributions. The examples we will present in this paper include the
lambda-phi-four theory and Yukawa coupling between fermions and scalars.Comment: 34 pages, 8 figures. Figure 1 has been change
Phase diagram for non-axisymmetric plasma balls

Plasma balls and rings emerge as fluid holographic duals of black holes and
black rings in the hydrodynamic/gravity correspondence for the Scherk-Schwarz
AdS system. Recently, plasma balls spinning above a critical rotation were
found to be unstable against m-lobed perturbations. In the phase diagram of
stationary solutions the threshold of the instability signals a bifurcation to
a new phase of non-axisymmetric configurations. We find explicitly this family
of solutions and represent them in the phase diagram. We discuss the
implications of our results for the gravitational system. Rotating
non-axisymmetric black holes necessarily radiate gravitational waves. We thus
emphasize that it would be important, albeit possibly out of present reach, to
have a better understanding of the hydrodynamic description of gravitational
waves and of the gravitational interaction between two bodies. We also argue
that it might well be that a non-axisymmetric m-lobed instability is also
present in Myers-Perry black holes for rotations below the recently found
ultraspinning instability.Comment: 1+22 pages, 3 figures. v2: minor corrections and improvements,
  matches published versio
Rare B Decays with a HyperCP Particle of Spin One

In light of recent experimental information from the CLEO, BaBar, KTeV, and
Belle collaborations, we investigate some consequences of the possibility that
a light spin-one particle is responsible for the three Sigma^+ -> p mu^+ mu^-
events observed by the HyperCP experiment. In particular, allowing the new
particle to have both vector and axial-vector couplings to ordinary fermions,
we systematically study its contributions to various processes involving
b-flavored mesons, including B-Bbar mixing as well as leptonic, inclusive, and
exclusive B decays. Using the latest experimental data, we extract bounds on
its couplings and subsequently estimate upper limits for the branching ratios
of a number of B decays with the new particle. This can serve to guide
experimental searches for the particle in order to help confirm or refute its
existence.Comment: 17 pages, 3 figures; discussion on spin-0 case modified, few errors
  corrected, main conclusions unchange
Wilson loops stability in the gauge/string correspondence

We study the stability of some classical string worldsheet solutions employed
for computing the potential energy between two static fundamental quarks in
confining and non-confining gravity duals. We discuss the fixing of the
diffeomorphism invariance of the string action, its relation with the
fluctuation orientation and the interpretation of the quark mass substraction
worldsheet needed for computing the potential energy in smooth (confining)
gravity background. We consider various dual gravity backgrounds and show by a
numerical analysis the existence of instabilities under linear fluctuations for
classical string embedding solutions having positive length function derivative
$L'(r_0)>0$. Finally we make a brief discussion of 't Hooft loops in
non-conformal backgrounds.Comment: 34 pages, 36 figures. Reference added. Final version JHEP accepte
Gauge-mediated supersymmetry breaking with generalized messenger sector
  at LHC

We consider the generalized gauge mediated supersymmetry breaking (GMSB)
models with the messenger fields which do not form the complete multiplets of
SU(5) GUT symmetry. Such a situation may happen in the anomalous U(1) GUT
scenario because the mass spectrum of the superheavy particle does not respect
SU(5) GUT symmetry, although the success of the gauge coupling unification can
be explained. In this paper, we assume that one pair of the messenger fields
gives the dominant contribution, and the LHC signature for the two possible
messengers, X + \bar{X} and Q + \bar{Q}, are examined. We investigate the
possibility to measure the deviation from the usual GUT relation of the gaugino
masses which is one of the most important features of these scenarios.Comment: 25 pages, 24 figure
On Supersymmetric D7-branes in the Warped Deformed Conifold

We study the supersymmetric properties of D7-branes in the warped deformed conifold. We consider the $\kappa$-symmetry conditions on D7-branes in this specific warped background, taking into account the background NS-NS 2-form flux. While any holomorphic embedding defines a supersymmetric D7-brane in the absence of background H-flux, most of the D7-brane embeddings considered in the literature do not preserve supersymmetry for the warped deformed conifold without also including brane worldvolume flux. For the simplest such embedding, we construct numerically the worldvolume fluxnecessary to restore supersymmetry. We also comment on the dual field theory descriptions in terms of cascading N=1 supersymmetric gauge theories with flavors. Finally, we discuss some possible applications of our results to moduli stabilization and vacuum energy uplifting, gauge/gravity duality, and string inflationary model building
Aspects of Flavour and Supersymmetry in F-theory GUTs

We study the constraints of supersymmetry on flavour in recently proposed
models of F-theory GUTs. We relate the topologically twisted theory to the
canonical presentation of eight-dimensional super Yang-Mills and provide a
dictionary between the two. We describe the constraints on Yukawa couplings
implied by holomorphy of the superpotential in the effective 4-dimensional
supergravity theory, including the scaling with \alpha_{GUT}. Taking D-terms
into account we solve explicitly to second order for wavefunctions and Yukawas
due to metric and flux perturbations and find a rank-one Yukawa matrix with no
subleading corrections.Comment: 26 pages; v2. journal versio
Reciprocity and integrability in the sl(2) sector of N=4 SYM

We analyze the higher conserved charges of type IIB superstring on AdS5 x S5
from the perspective of a recently discovered generalized Gribov-Lipatov
reciprocity. We provide several evidences that reciprocity holds for all the
higher charges and not only for the energy. This is discussed in the simple
case of twist L=2, and 3 operators in the sl(2) subsector at (a) multi-loop
level in weak coupling, (b) classical level at strong coupling for the dual
folded string.Comment: 27 pages, improved bibliograph
A UV completion of scalar field theory in arbitrary even dimensions

Following a previous work (hep-th/0410248), where a scalar field theory with
a modified propagator and phi^4 interaction in 4 dimensions is constructed to
be UV-finite, unitary and Lorentz invariant, we discuss in this paper general
phi^n theory in arbitrary even space-time dimensions. We show that the theory
is still UV-finite, unitary and Lorentz invariant if the propagators are chosen
to meet certain simple conditions depending on the space-time dimension but
independent of n. We also comment that our model is reminiscent of string
theory in the way UV divergence is avoided.Comment: 18 page
Forward-backward asymmetry, branching ratio and rate difference between electron and muon channels of B -> K-1(K*)l(+)l(-) transition in supersymmetric models

The mass eigen states K-1(1270) and K-1(1400) are mixture of the strange members of two axial-vector SU(3) octet, P-3(1)(K-1(A)) and P-1(1)(K-1(B)). Taking into account this mixture, the forward-backward asymmetry(A(FB)), branching ratio(Br) and rate difference of electron channel to muon channel(R) of B --> K-1(1270, 1400)l(+)l(-) transitions are studied in the framework of different supersymmetric models. MSSM with R parity is considered because considerable deviation from the standard model predictions can be obtained in B -- >X(s)l(-)l(+). Taking C-Q1 and C-Q2 about one which is consistent with the B --> K*mu(+)mu(-) rate at low dileptonic invariant mass region(1 <= q(2) <= 6GeV(2)), we obtain a size able deviation for A(FB), Br and R with respect to the Standard Model results. Any measurement of physical observables and their comparison with the results obtained in this paper can gives useful information about the nature of interactions beyond the standard model
Multiparton Interactions and Rescattering

The concept of multiple partonic interactions in hadronic events is vital for
the understanding of both minimum-bias and underlying-event physics. The area
is rather little studied, however, and current models offer a far from complete
coverage, even of the effects we know ought to be there. In this article we
address one such topic, namely that of rescattering, where an already scattered
parton is allowed to take part in another subsequent scattering. A framework
for rescattering is introduced for the Pythia 8 event generator and fully
integrated with normal multiparton interactions and initial- and final-state
radiation. Using this model, the effects on event structure are studied, and
distributions are shown both for minimum-bias and jet events