pinecone/core-2020-05-10-deduplication huggingface dataset:
Search for Lepton Flavor and Lepton Number Violating tau Decays into a
  Lepton and Two Charged Mesons

We search for lepton flavor and lepton number violating tau decays into a
lepton (ell = electron or muon) and two charged mesons (h,h' = pi^\pm or
K^\pm), tau- -> ell-h+h'- and tau- -> ell+h-h'-, using 671 fb^{-1} of data
collected with the Belle detector at the KEKB asymmetric-energy e+e- collider.
We obtain 90% C.L. upper limits on the branching fractions in the range
(4.4-8.8)x10^{-8} for tau -> ehh', and (3.3-16)x10^{-8} for tau -> muhh'
processes. These results improve upon previously published upper limits by
factors between 1.6 to 8.8.Comment: 15 page, 7 figures, submitted to Phys. Lett.
A Widely-Separated, Highly-Occluded Companion to the Nearby Low-Mass T
  Tauri Star TWA 30

We report the discovery of TWA 30B, a wide (~3400 AU), co-moving M dwarf
companion to the nearby (~42 pc) young star TWA 30. Companionship is confirmed
from their statistically consistent proper motions and radial velocities, as
well as a chance alignment probability of only 0.08%. Like TWA 30A, the
spectrum of TWA 30B shows signatures of an actively accreting disk (H I and
alkali line emission) and forbidden emission lines tracing outflowing material
([O I], [O II], [O III], [S II], and [N II]). We have also detected [C I]
emission in the optical data, marking the first such detection of this line in
a pre-main sequence star. Negligible radial velocity shifts in the emission
lines relative to the stellar frame of rest (Delta V < 30 km/s) indicate that
the outflows are viewed in the plane of the sky and that the corresponding
circumstellar disk is viewed edge-on. Indeed, TWA 30B appears to be heavily
obscured by its disk, given that it is 5 magnitudes fainter than TWA 30A at
K-band despite having a slightly earlier spectral type (M4 versus M5). The
near-infrared spectrum of TWA 30B also evinces an excess that varies on day
timescales, with colors that follow classical T Tauri tracks as opposed to
variable reddening (as is the case for TWA 30A). Multi-epoch data show this
excess to be well-modeled by a blackbody component with temperatures ranging
from 630 to 880 K and emitting areas that scale inversely with the temperature.
The variable excess may arise from disk structure such as a rim or a warp at
the inner disk edge located at a radial distance of ~3-5 R_sun. As the second
and third closest actively accreting and outflowing stars to the Sun (after TWA
3), TWA 30AB presents an ideal system for detailed study of star and planetary
formation processes at the low-mass end of the hydrogen-burning spectrum.Comment: 34 pages, 6 figures, AJ in press; Replaced Figure 4 with a better
  color version, added 3 references and slightly amended Section 3.2.
The Anisotropy of Cosmic Ray Arrival Direction around 10^18eV

Anisotropy in the arrival directions of cosmic rays around 10^{18}eV is
studied using data from the Akeno 20 km^2 array and the Akeno Giant Air Shower
Array (AGASA), using a total of about 216,000 showers observed over 15 years
above 10^{17}eV. In the first harmonic analysis, we have found significant
anisotropy of $\sim$ 4 % around 10^{18}eV, corresponding to a chance
probability of $\sim 10^{-5}$ after taking the number of independent trials
into account. With two dimensional analysis in right ascension and declination,
this anisotropy is interpreted as an excess of showers near the directions of
the Galactic Center and the Cygnus region. This is a clear evidence for the
existence of the galactic cosmic ray up to the energy of 10^{18}eV. Primary
particle which contribute this anisotropy may be proton or neutron.Comment: 4pages, three figures, to appear in Procedings of 26th ICRC(Salt Lake
  City
Magnetic Susceptibility of the Balian-Werthamer Phase of 3He in Aerogel

The equilibrium superfluid phase of 3He impregnated into high-porosity silica
aerogels appears to be a non-equal-spin-pairing state in zero field at all
pressures, which is generally assumed to be the Balian-Werthamer (BW) phase
modified by the depairing effects of the aerogel structure. The nuclear
magnetic susceptibility played a key role in identifying the B-phase of pure
3He with the BW state. We report theoretical calculations of the nuclear
magnetic susceptibility for the BW model of superfluid 3He in aerogel within
the framework of the Fermi-liquid theory of superfluid 3He. Scattering of
quasiparticles by the aerogel, in addition to Fermi-liquid exchange
corrections, leads to substantial changes in the susceptibility of the BW
phase. The increase in the magnetic susceptibility of 3He-aerogel compared to
pure 3He-B is related to the polarizability of the gapless excitations and the
impurity-induced local field. The limited data that is available is in rough
agreement with theoretical predictions. Future measurements could prove
important for a more definitive identification of the ordered phase, as well as
for refining the theoretical model for the effects of disorder and scattering
on the properties of superfluid 3He.Comment: 22 pages with 9 figure
Space--time torsion contribution to quantum interference phases

From the latest experimental readouts in this context an intriguing
discrepancy has been elicited. Indeed, theory and experiment dissent by one per
cent, and though this fact could be a consequence of the mounting of the
experimental device, it might also embody a difference between the way in which
gravity behaves in classical and quantum mechanics. In this work the effects,
upon the interference pattern, of space--time torsion will be analyzed heeding
its coupling with the spin of the neutron beam. It will be proved that, even
with this contribution, there is enough leeway for a further discussion of the
validity of the equivalence principle in nonrelativistic quantum mechanics.Comment: Contribution to the Proceedings of the Meeting ''Topics in
  Mathematical Physics, General Relativity, and Cosmology''. On the Occasion of
  the 75th Birthday of Jerzy F. Plebanski. CINVESTAV, September, 17th--20th,
  200
Simulation of n_f =3 QCD by Hybrid Monte Carlo

Simulations of odd flavors QCD can be performed in the framework of the
hybrid Monte Carlo algorithm where the inverse of the fermion matrix is
approximated by a polynomial. In this exploratory study we perform three
flavors QCD simulations. We make a comparison of the hybrid Monte Carlo
algorithm and the R-algorithm which also simulates odd flavors systems but has
step-size errors. We find that results from our hybrid Monte Carlo algorithm
are in agreement with those from the R-algorithm obtained at very small
step-size.Comment: Lattice 2000 (Algorithms), 5 pages, 8 figures, LaTe
Orbit classification in the meridional plane of a disk galaxy model with
  a spherical nucleus

We investigate the regular or chaotic nature of star orbits moving in the
meridional plane of an axially symmetric galactic model with a disk and a
spherical nucleus. We study the influence of some important parameters of the
dynamical system, such as the mass and the scale length of the nucleus, the
angular momentum or the energy, by computing in each case the percentage of
chaotic orbits, as well as the percentages of orbits of the main regular
resonant families. Some heuristic arguments to explain and justify the
numerically derived outcomes are also given. Furthermore, we present a new
method to find the threshold between chaos and regularity for both Lyapunov
Characteristic Numbers and SALI, by using them simultaneously.Comment: Published in Celestial Mechanics & Dynamical Astronomy (CMDA) journa
Study of $D_J$ meson decays to $D^+\pi^-$, $D^0 \pi^+$ and $D^{*+}\pi^-$
  final states in pp collision

A study of $D^+\pi^-$, $D^0 \pi^+$ and $D^{*+}\pi^-$ final states is
performed using pp collision data, corresponding to an integrated luminosity of
1.0 $fb^{-1}$, collected at a centre-of-mass energy of 7 TeV with the LHCb
detector. The $D_1(2420)^0$ resonance is observed in the $D^{*+}\pi^-$ final
state and the $D^*_2(2460)$ resonance is observed in the $D^+\pi^-$, $D^0
\pi^+$ and $D^{*+}\pi^-$ final states. For both resonances, their properties
and spin-parity assignments are obtained. In addition, two natural parity and
two unnatural parity resonances are observed in the mass region between 2500
and 2800 MeV. Further structures in the region around 3000 MeV are observed in
all the $D^{*+}\pi^-$, $D^+\pi^-$ and $D^0 \pi^+$ final states.Comment: 30 pages, 12 pdf figures, submitted to JHE
Inclusive search for a vector-like T quark with charge 2/3 in pp
  collisions at sqrt(s) = 8 TeV

A search is performed for a massive new vector-like quark T, with charge 2/3,
that is pair produced together with its antiparticle in proton-proton
collisions. The data were collected by the CMS experiment at the Large Hadron
Collider in 2012 at sqrt(s) = 8 TeV and correspond to an integrated luminosity
of 19.5 inverse femtobarns. The T quark is assumed to decay into three
different final states, bW, tZ, and tH. The search is carried out using events
with at least one isolated lepton. No deviations from standard model
expectations are observed, and lower limits are set on the T quark mass at 95%
confidence level. The lower limit lies between 687 and 782 GeV for all possible
values of the branching fractions into the three different final states
assuming strong production. These limits are the most stringent constraints to
date on the existence of such a quark.Comment: Replaced with published version. Added journal reference and DO
Massive twistor particle with spin generated by Souriau-Wess-Zumino term
  and its quantization

We present new model of D=4 relativistic massive particle with spin and we
describe its quantization. The model is obtained by an extension of standard
relativistic phase space description of massive spinless particle by adding new
topological Souriau-Wess-Zumino term which depends on spin fourvector variable.
We describe equivalently our model as given by the free two-twistor action with
suitable constraints. An important tool in our derivation is the spin-dependent
twistor shift, which modifies standard Penrose incidence relations. The
quantization of the model provides the wave function with correct mass and spin
eigenvalues.Comment: 1+15 page
Nonlinear Zeno dynamics due to atomic interactions in Bose-Einstein
  condensate

We show that nonlinear interactions induce both the Zeno and anti-Zeno
effects in the generalised Bose-Josephson model (with the on-site interactions
and the second-order tunneling) describing Bose-Einstein condensate in
double-well trap subject to particle removal from one of the wells. We find
that the on-site interactions induce \textit{only} the Zeno effect, which
appears at long evolution times, whereas the second-order tunneling leads to a
strong decay of the atomic population at short evolution times, reminiscent of
the anti-Zeno effect, and destroys the nonlinear Zeno effect due to the on-site
interactions at long times.Comment: 8 pages, 3 figures. Physica B, DOI: 10.1016/j.physb.2014.08.00
aMCfast: automation of fast NLO computations for PDF fits

We present the interface between MadGraph5_aMC@NLO, a self-contained program
that calculates cross sections up to next-to-leading order accuracy in an
automated manner, and APPLgrid, a code that parametrises such cross sections in
the form of look-up tables which can be used for the fast computations needed
in the context of PDF fits. The main characteristic of this interface, which we
dub aMCfast, is its being fully automated as well, which removes the need to
extract manually the process-specific information for additional physics
processes, as is the case with other matrix element calculators, and renders it
straightforward to include any new process in the PDF fits. We demonstrate this
by studying several cases which are easily measured at the LHC, have a good
constraining power on PDFs, and some of which were previously unavailable in
the form of a fast interface.Comment: 36 pages, 10 figure
Leading large-x logarithms of the quark-gluon contributions to inclusive
  Higgs-boson and lepton-pair production

We present all-order expressions for the leading double-logarithmic threshold
contributions to the quark-gluon coefficient functions for inclusive
Higgs-boson production in the heavy top-quark limit and for Drell-Yan
lepton-pair production. These results have been derived using the structure of
the unfactorized cross sections in dimensional regularization and the large-x
resummation of the gluon-quark and quark-gluon splitting functions. The
resummed coefficient functions, which are identical up to colour factor
replacements, are similar to their counterparts in deep-inelastic scattering
but slightly more complicated.Comment: 8 pages, LaTeX, 1 figure (.eps). DESY address until 31 August 201
High-efficiency resonant amplification of weak magnetic fields for
  single spin magnetometry

We demonstrate theoretically that by placing a ferromagnetic particle between
a nitrogen-vacancy (NV) magnetometer and a target spin, the magnetometer
sensitivity is increased dramatically. Specifically, using materials and
techniques already experimentally available, we find that by taking advantage
of the ferromagnetic resonance the minimum magnetic moment that can be measured
is smaller by four orders of magnitude in comparison to current
state-of-the-art magnetometers. As such, our proposed setup is sensitive enough
to detect a single nuclear spin at a distance of $30$~nm from the surface
within less than one second of data acquisition at room temperature. Our
proposal opens the door for nanoscale NMR on biological material under ambient
conditions.Comment: 11 pages, 7 figure
Finite energy/action solutions of $p_1$ Yang-Mills equations on $p_2$
  Schwarzschild and deSitter backgrounds for dimension $d \ge 4$

Physically relevant gauge and gravitational theories can be seen as special
members of hierarchies of more elaborate systems. The Yang-Mills (YM) system is
the first member of a hierarchy of Lagrangians which we will index by $p_1$,
and the Einstein-Hilbert (EH) system of general relativity is the first member
of another hierarchy which we index by $p_2$. In this paper, we study the
classical equations of the $p_1 = 1,2$ YM hierarchy considered in the
background of special geometries (Schwarzschild, deSitter,anti-deSitter) of the
$p_2=1,2,3$ EH hierarchy. Solutions are obtained in various dimensions and lead
to several examples of non-self-dual YM fields. When $p_1=p_2$ self-dual
solutions exist in addition. Their action is equal to the Chern-Pontryagin
charge and can be compared with that of the non-self-dual solutions.Comment: LaTeX, 25 pages, 2 figures, new title, minor change
Asymptotic Conformal Invariance in a Non-Abelian Chern-Simons-Matter
  Model

One shows here the existence of solutions to the Callan-Symanzik equation for
the non-Abelian SU(2) Chern-Simons-matter model which exhibits asymptotic
conformal invariance to every order in perturbative theory. The conformal
symmetry in the classical domain is shown to hold by means of a local criteria
based on the trace of the energy-momentum tensor. By using the recently
exhibited regimes for the dependence between the several couplings in which the
set of $\beta$-functions vanish, the asymptotic conformal invariance of the
model appears to be valid in the quantum domain. By considering the SU(n) case
the possible non validity of the proof for a particular n would be merely
accidental.Comment: Latex2e 8 page
Branes and anti-de Sitter spacetimes

We consider a series of duality transformations that leads to a constant shift in the harmonic functions appearing in the description of a configuration of branes. This way, for several intersections of branes, we can relate the original brane configuration which is asymptotically flat to a geometry which is locally isometric to adS_k x E^l x S^m. These results imply that certain branes are dual to supersingleton field theories. We also discuss the implications of our results for supersymmetry enhancement and for supergravity theories in diverse dimensions
Symplectic Structure of General Relativity for Spatially Bounded Spacetime Regions. Part II: Properties and Examples

We continue a previous analysis of the covariant Hamiltonian symplectic structure of General Relativity for spatially bounded regions of spacetime. To allow for near complete generality, the Hamiltonian is formulated using any fixed hypersurface, with a boundary given by a closed spacelike 2-surface. A main result is that we obtain Hamiltonians associated to Dirichlet and Neumann boundary conditions on the gravitational field coupled to matter sources, in particular a Klein-Gordon field, an electromagnetic field, and a set of Yang-Mills-Higgs fields. The Hamiltonians are given by a covariant form of the Arnowitt-Deser-Misner Hamiltonian modified by a surface integral term that depends on the particular boundary conditions. The general form of this surface integral involves an underlying ``energy-momentum'' vector in the spacetime tangent space at the spatial boundary 2-surface. We give examples of the resulting Dirichlet and Neumann vectors for topologically spherical 2-surfaces in Minkowski spacetime, spherically symmetric spacetimes, and stationary axisymmetric spacetimes. Moreover, we show the relation between these vectors and the ADM energy-momentum vector for a 2-surface taken in a limit to be spatial infinity in asymptotically flat spacetimes. We also discuss the geometrical properties of the Dirichlet and Neumann vectors and obtain several striking results relating these vectors to the mean curvature and normal curvature connection of the 2-surface. Most significantly, the part of the Dirichlet vector normal to the 2-surface depends only the spacetime metric at this surface and thereby defines a geometrical normal vector field on the 2-surface
Non-supersymmetric Orientifolds with D-branes at Angles

We present special classes of orientifold models involving supersymmetry breaking via branes at angles. Type II superstring theories are compactified on a two torus times a four-dimensional orbifold. Combining worldsheet parity with a reflection of half of the compact coordinates leads to D6-branes at angles which are mapped onto each other by the orbifold group, while applying the geometric action only along one coordinate leads to intersecting D8-branes with non-trivial transformation properties under the orbifold group. The models differ in the gauge groups and matter content
Diagrammatic Kazhdan-Lusztig theory for the (walled) Brauer algebra

We determine the decomposition numbers for the Brauer and walled Brauer algebras in characteristic zero in terms of certain polynomials associated to cap and curl diagrams (recovering a result of Martin in the Brauer case). We consider a second family of polynomials associated to such diagrams, and use these to determine projective resolutions of the standard modules. We then relate these two families of polynomials to Kazhdan–Lusztig theory via the work of Lascoux–Schützenberger and Boe, inspired by work of Brundan and Stroppel in the cap diagram case
CW and pulsed electrically detected magnetic resonance spectroscopy at
  263 GHz/12 T on operating amorphous silicon solar cells

Here we describe a new high frequency/high field continuous wave and pulsed
electrically detected magnetic resonance (CW EDMR and pEDMR) setup, operating
at 263 GHz and resonance fields between 0 and 12 T. Spin dependent transport in
illuminated hydrogenated amorphous silicon p-i-n solar cells at 5 K and 90 K
was studied by in operando 263 GHz CW and pEDMR alongside with complementary
X-band CW EDMR. Benefiting from the superior resolution at 263 GHz, we were
able to better resolve EDMR signals originating from spin dependent hopping and
recombination processes. 5 K EDMR spectra were found to be dominated by
conduction and valence band tale states involved in spin dependent hopping,
with additional contributions from triplet exciton states. 90 K EDMR spectra
could be assigned to spin pair recombination involving conduction band tail
states and dangling bonds as dominating spin dependent transport process, with
additional contributions from valence band tail and triplet exciton states.Comment: 8 pages, 4 figure
Evolution of field line helicity during magnetic reconnection

We investigate the evolution of field line helicity for magnetic fields that
connect two boundaries without null points, with emphasis on localized finite-B
magnetic reconnection. Total (relative) magnetic helicity is already recognized
as an important topological constraint on magnetohydrodynamic processes. Field
line helicity offers further advantages because it preserves all topological
information and can distinguish between different magnetic fields with the same
total helicity. Magnetic reconnection changes field connectivity and field line
helicity reflects these changes; the goal of this paper is to characterize that
evolution. We start by deriving the evolution equation for field line helicity
and examining its terms, also obtaining a simplified form for cases where
dynamics are localized within the domain. The main result, which we support
using kinematic examples, is that during localized reconnection in a complex
magnetic field, the evolution of field line helicity is dominated by a
work-like term that is evaluated at the field line endpoints, namely the scalar
product of the generalized field line velocity and the vector potential.
Furthermore, the flux integral of this term over certain areas is very small
compared to the integral of the unsigned quantity, which indicates that changes
of field line helicity happen in a well-organized pairwise manner. It follows
that reconnection is very efficient at redistributing helicity in complex
magnetic fields despite having little effect on the total helicity.Comment: 11 pages, 8 figures. Accepted for publication in Physics of Plasma
An Improved Limit for Gamma_ee of X(3872) and Gamma_ee Measurement of
  psi(3686)

Using the data sets taken at center-of-mass energies above 4 GeV by the
BESIII detector at the BEPCII storage ring, we search for the reaction e+e- ->
gamma_ISR X(3872) -> gamma_ISR pi+pi-J/psi via the Initial State Radiation
technique. The production of a resonance with quantum numbers J^PC = 1^++ such
as the X(3872) via single photon e+e- annihilation is forbidden, but is allowed
by a next-to-leading order box diagram. We do not observe a significant signal
of X(3872), and therefore give an upper limit for the electronic width times
the branching fraction Gamma_ee^X(3872)Br(X(3872) -> pi+pi-J\psi) < 0.13 eV at
the 90% confidence level. This measurement improves upon existing limits by a
factor of 46. Using the same final state, we also measure the electronic width
of the psi(3686) to be Gamma_ee^psi(3686) = 2231 +- 18 +- 99 eV.Comment: 9 pages, 2 figure