pinecone/core-2020-05-10-deduplication huggingface dataset:
Search for light top squark pair production in final states with leptons and b-jets with the ATLAS detector in root s=7 TeV proton-proton collisions

ATLAS Collaboration contributor: Paul Douglas Jackson and Nitesh Soni of School of Chemistry and Physics, University of Adelaide, Adelaide, AustraliaThe results of a search for pair production of light top squarks are presented, using 4.7 fb⁻¹ of View the MathML sources=7 TeV proton–proton collisions collected with the ATLAS detector at the Large Hadron Collider. This search targets top squarks with masses similar to, or lighter than, the top quark mass. Final states containing exclusively one or two leptons (e,μe,μ), large missing transverse momentum, light-flavour jets and b-jets are used to reconstruct the top squark pair system. Event-based mass scale variables are used to separate the signal from a large tt¯ background. No excess over the Standard Model expectations is found. The results are interpreted in the framework of the Minimal Supersymmetric Standard Model, assuming the top squark decays exclusively to a chargino and a b-quark, while requiring different mass relationships between the Supersymmetric particles in the decay chain. Light top squarks with masses between 123–167 GeV are excluded for neutralino masses around 55 GeV.ATLAS Collaboratio
Search for associated production of a Z boson with a single top quark and for tZ flavour-changing interactions in pp collisions at $\sqrt{s} = 8$ TeV

A search for the production of a single top quark in association with a Z boson is presented, both to identify the expected standard model process and to search for flavour-changing neutral current interactions. The data sample corresponds to an integrated luminosity of 19.7 $fb^{−1}$ recorded by the CMS experiment at the LHC in proton-proton collisions at $\sqrt{s} = 8$ TeV. Final states with three leptons (electrons or muons) and at least one jet are investigated. An events yield compatible with tZq standard model production is observed, and the corresponding cross section is measured to be $σ(pp → tZq → ℓνbℓ^+ℓ^−q) = 10_{−7}$$^{+ 8} fb$ with a significance of 2.4 standard deviations. No presence of flavour-changing neutral current production of tZq is observed. Exclusion limits at 95% confidence level on the branching fractions of a top quark decaying to a Z boson and an up or a charm quark are found to be ℬ(t → Zu) < 0.022% and ℬ(t → Zc) < 0.049%
p62 Is Required for Stem Cell/Progenitor Retention through Inhibition of IKK/NF-kB/Ccl4 Signaling at the Bone Marrow Macrophage-Osteoblast Niche

In the bone marrow (BM), hematopoietic progenitors\ud
(HPs) reside in specific anatomical niches near osteoblasts\ud
(Obs), macrophages (MFs), and other cells forming the BM microenvironment. A connection between immunosurveillance and traffic of HP has been demonstrated, but the regulatory signals that instruct the immune regulation of HP circulation are unknown. We discovered that the BM microenvironment deficiency of p62, an autophagy regulator and signal organizer, results in loss of autophagic repression of macrophage contact-dependent activation of\ud
Ob NF-kB signaling. Consequently, Ob p62-deficient\ud
mice lose bone, Ob Ccl4 expression, and HP chemotaxis\ud
toward Cxcl12, resulting in egress of short-term\ud
hematopoietic stem cells and myeloid progenitors.\ud
Finally, Ccl4 expression and myeloid progenitor\ud
egress are reversed by deficiency of the p62 PB1-\ud
binding partner Nbr1. A functional ‘‘MF-Ob niche’’\ud
is required for myeloid progenitor/short-term stem\ud
cell retention, in which Ob p62 is required to maintain\ud
NF-kB signaling repression, osteogenesis, and BM\ud
progenitor retention
Multiparticle quasiexactly solvable difference equations

Several explicit examples of multiparticle quasiexactly solvable “discrete” quantum mechanical Hamiltonians are derived by deforming the well-known exactly solvable multiparticle Hamiltonians, the Ruijsenaars-Schneider-van Diejen systems. These are difference analogs of the quasiexactly solvable multiparticle systems, the quantum Inozemtsev systems obtained by deforming the well-known exactly solvable Calogero-Sutherland systems. They have a finite number of exactly calculable eigenvalues and eigenfunctions. This paper is a multiparticle extension of the recent paper by one of the authors [R. Sasaki, J. Math. Phys.48, 122104 (2007)] on deriving quasiexactly solvable difference equations of single degree of freedom
Numerical simulation of solitary wave propagation over a steady current

YesA two-dimensional numerical model is developed to study the propagation of a solitary wave in the presence of a steady current flow. The numerical model is based on the Reynolds-averaged Navier-Stokes (RANS) equations with a k-ε turbulence closure scheme and an internal wave-maker method. To capture the air-water interface, the volume of fluid (VOF) method is used in the numerical simulation. The current flow is initialized by imposing a steady inlet velocity on one computational domain end and a constant pressure outlet on the other end. The desired wave is generated by an internal wave-maker. The propagation of a solitary wave travelling with a following/opposing current is simulated. The effects of the current velocity on the solitary wave motion are investigated. The results show that the solitary wave has a smaller wave height, larger wave width and higher travelling speed after interacting with a following current. Contrariwise, the solitary wave becomes higher with a smaller wave width and lower travelling speed with an opposing current. The regression equations for predicting the wave height, wave width and travelling speed of the resulting solitary wave are for practical engineering applications. The impacts of current flow on the induced velocity and the turbulent kinetic energy (TKE) of a solitary wave are also investigated.National Natural Science Foundation of China Grant #51209083, #51137002 and #41176073, the Natural Science Foundation of Jiangsu Province (China) Grant #BK2011026, the 111 Project under Grant No. B12032, the Fundamental Research Funds for the Central University, China (2013B31614), and the Carnegie Trust for Scottish Universitie
Search for new high-mass phenomena in the dilepton final state using 36 fb(-1)of proton-proton collision data at root s=13 TeV with the ATLAS detector

Published: October 26, 2017A search is conducted for new resonant and non-resonant high-mass phenomena in dielectron and dimuon final states. The search uses 36.1 fb−1 of proton-proton collision data, collected at s√=13 TeV by the ATLAS experiment at the LHC in 2015 and 2016. No significant deviation from the Standard Model prediction is observed. Upper limits at 95% credibility level are set on the cross-section times branching ratio for resonances decaying into dileptons, which are converted to lower limits on the resonance mass, up to 4.1 TeV for the E6-motivated Z χ ′ . Lower limits on the qqℓℓ contact interaction scale are set between 2.4 TeV and 40 TeV, depending on the model.M. Aaboud ... D. Duvnjak ... P. Jackson ... L. Lee ... A. Petridis ... M.J. White ... et al. (The ATLAS Collaboration
Heterotic α´-corrections in Double Field Theory

We extend the generalized flux formulation of Double Field Theory to include all the first order bosonic contributions to the α′ expansion of the heterotic string low energy effective theory. The generalized tangent space and duality group are enhanced by α′ corrections, and the gauge symmetries are generated by the usual (gauged) generalized Lie derivative in the extended space. The generalized frame receives derivative corrections through the spin connection with torsion, which is incorporated as a new degree of freedom in the extended bein. We compute the generalized fluxes and find the Riemann curvature tensor with torsion as one of their components. All the four-derivative terms of the action, Bianchi identities and equations of motion are reproduced. Using this formalism, we obtain the first order α′ corrections to the heterotic Buscher rules. The relation of our results to alternative formulations in the literature is discussed and future research directions are outlined.Fil: Bedoya Delgado, Oscar Andres. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomia y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomia y Física del Espacio; ArgentinaFil: Marques, Diego. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomia y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomia y Física del Espacio; ArgentinaFil: Nuñez, Carmen Alicia. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomia y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomia y Física del Espacio; Argentin
Probabilistic opinion pooling generalised. Part one: general agendas

How can several individuals’ probability assignments to some events be aggregated into a collective probability assignment? Classic results on this problem assume that the set of relevant events—the agenda—is a σ-algebra and is thus closed under disjunction (union) and conjunction (intersection). We drop this demanding assumption and explore probabilistic opinion pooling on general agendas. One might be interested in the probability of rain and that of an interest-rate increase, but not in the probability of rain or an interest-rate increase. We characterize linear pooling and neutral pooling for general agendas, with classic results as special cases for agendas that are σ-algebras. As an illustrative application, we also consider probabilistic preference aggregation. Finally, we unify our results with existing results on binary judgment aggregation and Arrovian preference aggregation. We show that the same kinds of axioms (independence and consensus preservation) have radically different implications for different aggregation problems: linearity for probability aggregation and dictatorship for binary judgment or preference aggregation
Broken planar Skyrmions — statics and dynamics.

The broken planar Skyrme model is a theory that breaks global O (3) symmetry to the dihedral group D N . It has been shown that the single soliton solution is formed of N constituent parts, named partons, that are topologically confined. The multisoliton solutions have already been computed for N = 3 and were shown to be related to polyiamonds. We extend this for larger N and demonstrate that this polyform structure continues (planar figures formed by regular N -gons joined along their edges, of which polyiamonds are the N = 3 subset). Furthermore, we numerically simulate the dynamics of this model for the first time. It will be demonstrated that the time dependent behaviour of these solutions can be broken down into the interactions of its constituent partons, with certain collisions exhibiting parton exchange. The results are then compared with those of the standard planar Skyrme model
Long-term survivors of childhood cancer report quality of life and health status in parity with a comparison group

Background: There is a need for more knowledge about how survivors of childhood cancer perceive their lives and what influence current health status has on their quality of life. The purpose was to describe this among a group of long-term survivors and among a comparison group. \ud
\ud
Procedure: Telephone interviews were performed with a cohort of 246 long-term survivors and 296 randomly selected from the general population using the Schedule for the Evaluation of Individual Quality of Life- Direct Weighting (SEIQoL-DW). The participants nominated the areas they considered to be most important in life and rated the current status of each area on a seven-point category scale. An overall individual index score was calculated as a measure of quality of life. Self-reported health status was assessed using the Short Form Health Survey (SF-36). \ud
\ud
Results: Long-term survivors rated their overall quality of life and self-reported health status almost in parity with the comparison group. In both groups, family life, relations to other people, work and career, interests and leisure activities were the areas most frequently reported to influence quality of life. The survivors only differed from the comparison group on one of eight SF-36 scales reflecting problems with daily activities owing to physical health. \ud
\ud
Conclusions: Health status was not shown to have a major impact on overall quality of life, indicating that health and quality of life should be evaluated distinctively as different constructs. This should be taken in consideration in clinical care of children with childhood cancer and long-term survivors
Path Integral Monte Carlo calculation of momentum distribution in solid
  \^4\He

We perform calculations of the momentum distribution n(k) in solid \^4\He by
means of path integral Monte Carlo methods. We see that, in perfect crystal,
n(k) does not depend on temperature T and that is different from the classical
Gaussian shape of Maxwell-Boltzmann distribution, even though these
discrepancies decrease when the density of the system increases. In crystal
presenting vacancies, we see that for T \ge 0.75K, n(k) presents the same
behavior as in the perfect crystal, but, at lower T, it presents a peak when
k\to0.Comment: 8 pages, 5 figure
The Herschel Exploitation of Local Galaxy Andromeda (HELGA). I: Global
  far-infrared and sub-mm morphology

We have obtained Herschel images at five wavelengths from 100 to 500 micron
of a ~5.5x2.5 degree area centred on the local galaxy M31 (Andromeda), our
nearest neighbour spiral galaxy, as part of the Herschel guaranteed time
project "HELGA". The main goals of HELGA are to study the characteristics of
the extended dust emission, focusing on larger scales than studied in previous
observations of Andromeda at an increased spatial resolution, and the obscured
star formation. In this paper we present data reduction and Herschel maps, and
provide a description of the far-infrared morphology, comparing it with
features seen at other wavelengths. We use high--resolution maps of the atomic
hydrogen, fully covering our fields, to identify dust emission features that
can be associated to M31 with confidence, distinguishing them from emission
coming from the foreground Galactic cirrus. Thanks to the very large extension
of our maps we detect, for the first time at far-infrared wavelengths, three
arc-like structures extending out to ~21, ~26 and ~31 kpc respectively, in the
south-western part of M31. The presence of these features, hosting ~2.2e6 Msol
of dust, is safely confirmed by their detection in HI maps. Overall, we
estimate a total dust mass of ~5.8e7 Msol, about 78% of which is contained in
the two main ring-like structures at 10 and 15 kpc, at an average temperature
of 16.5 K. We find that the gas-to-dust ratio declines exponentially as a
function of the galacto-centric distance, in agreement with the known
metallicity gradient, with values ranging from 66 in the nucleus to ~275 in the
outermost region. [Abridged]Comment: 15 Pages, 9 Figures. Accepted for publication in Astronomy and
  Astrophysics. A high resolution version of the paper can be found at
  http://wazn.ugent.be/jfritz/HelgaI_final.pd
Simulation of Magnetization Switching in Nanoparticle Systems

Magnetization reversal in magnetic nanostructures is investigated numerically
over time-scales ranging from fast switching processes on a picosecond scale to
thermally activated reversal on a microsecond time-scale. A simulation of the
stochastic Landau-Lifshitz equation of motion is used as well as a time
quantified Monte Carlo method for the simulation of classical spin systems
modeling magnetic Co nanoparticles. For field pulses larger than the
Stoner-Wohlfarth limit spin precession effects govern the reversal behavior of
the particle while for lower fields a magnetization reversal is only possible
when it is assisted by thermal fluctuations.Comment: 10 pages, 3 figure
Measurements of Scintillation Efficiency and Pulse-Shape for Low Energy
  Recoils in Liquid Xenon

Results of observations of low energy nuclear and electron recoil events in
liquid xenon scintillator detectors are given. The relative scintillation
efficiency for nuclear recoils is 0.22 +/- 0.01 in the recoil energy range 40
keV - 70 keV. Under the assumption of a single dominant decay component to the
scintillation pulse-shape the log-normal mean parameter T0 of the maximum
likelihood estimator of the decay time constant for 6 keV < Eee < 30 keV
nuclear recoil events is equal to 21.0 ns +/- 0.5 ns. It is observed that for
electron recoils T0 rises slowly with energy, having a value ~ 30 ns at Eee ~
15 keV. Electron and nuclear recoil pulse-shapes are found to be well fitted by
single exponential functions although some evidence is found for a double
exponential form for the nuclear recoil pulse-shape.Comment: 11 pages, including 5 encapsulated postscript figure
Search for W' boson production in the W'->tb decay channel

We present a search for the production of a new heavy gauge boson W' that
decays to a top quark and a bottom quark. We have analyzed 230 pb^{-1} of data
collected with the Dzero detector at the Fermilab Tevatron collider at a
center-of-mass energy of 1.96 TeV. No significant excess of events above the
standard model expectation is found in any region of the final state invariant
mass distribution. We set upper limits on the production cross section of W'
bosons times branching ratio to top quarks at the 95% confidence level for
several different W' boson masses. We exclude masses between 200 GeV and 610
GeV for a W' boson with standard-model-like couplings, between 200 GeV and 630
GeV for a W' boson with right-handed couplings that is allowed to decay to both
leptons and quarks, and between 200 GeV and 670 GeV for a W' boson with
right-handed couplings that is only allowed to decay to quarks.Comment: 9 pages, 6 figures, accepted by Phys. Lett.
D meson production in d+Au process using a perturbative approach

The D meson production at forward rapidities in d+Au processes is calculated
using a pQCD based model, assuming that this treatment could be used as a
baseline for distinct dynamical and medium effects. It is analysed how the
nuclear effects in the nuclear partonic distributions may affect this process
at RHIC and LHC energies. An enhancement in the moderate $q_T$ region for RHIC,
due to anti-shadowing in the nuclear medium, is found. Our prediction for LHC
suggests that shadowing will suppress the D meson spectra for $q_T<14$ GeV.Comment: 13 pages, 4 figures, version accepted to be published in Physics
  Letters
CP violation and electric-dipole-moment at low energy $\tau$ production
  with polarized electrons

The new proposals for high luminosity B/Flavor factories, near and on top of
the $\Upsilon$ resonances, allow for a detailed investigation of CP-violation
in the $\tau$-pair production. In particular, bounds on the tau electric dipole
moment can be obtained from genuine CP-odd observables related to the
$\tau$-pair production. We perform an independent analysis from low energy (10
GeV) data by means of linear spin observables. We show that, for a
longitudinally polarized electron beam, a CP-odd asymmetry, associated to the
normal polarization term, can be measured at these low energy facilities both
at resonant and non resonant energies. In this way, stringent and independent
bounds to the tau electric dipole moment, which are orders of magnitude below
other high or low energy bounds, can be obtained.Comment: 12 pages, 2 figure
Comments on N=(2,2) Supersymmetry on Two-Manifolds

We study curved-space rigid supersymmetry for two-dimensional
$\mathcal{N}=(2,2)$ supersymmetric fields theories with a vector-like
$R$-symmetry by coupling such theories to background supergravity. The
associated Killing spinors can be viewed as holomorphic sections of particular
complex line bundles over Euclidean space-time, which severely restrict the
allowed supersymmetric couplings on compact orientable Riemann surfaces without
boundaries. For genus $g>1$, the only consistent non-singular couplings are the
ones dictated by the topological $A$-twist. On spaces with $S^2$ topology,
there exist additional supersymmetric backgrounds with $m=0$ or $\pm 1$ unit of
flux for the $R$-symmetry gauge field. The $m=-1$ case includes the
$\Omega$-background on the sphere. We also systematically work out the
curved-space supersymmetry multiplets and supersymmetric Lagrangians.Comment: 38 pages+appendix; v2: new section 6.10 on NLSM Lagrangians; v3:
  corrected typos and added reference
Spin-dependent THz oscillator based on hybrid graphene superlattices

We theoretically study the occurrence of Bloch oscillations in biased hybrid
graphene systems with spin-dependent superlattices. The spin-dependent
potential is realized by a set of ferromagnetic insulator strips deposited on
top of a gapped graphene nanoribbon, which induce a proximity exchange
splitting of the electronic states in the graphene monolayer. We numerically
solve the Dirac equation and study Bloch oscillations in the lowest conduction
band of the spin-dependent superlattice. While the Bloch frequency is the same
for both spins, we find the Bloch amplitude to be spin dependent. This
difference results in a spin-polarized ac electric current in the THz range.Comment: 4 pages, 6 figure
On the renormalisability of gauge invariant extensions of the squared
  gauge potential

We show that gauge invariant extensions of the local functional $\cO =
\frac12\int d^4x A^2$ have long range non localities which can only be
``renormalised'' with reference to a specific gauge. Consequently, there is no
gauge independent way of claiming the perturbative renormalisability of these
extensions. In particular, they are not renormalisable in the modern sense of
Weinberg and Gomis. Critically, our study does not support the view that ghost
fields play an indispensable role in the extension of a local operator into a
non-local one as claimed recently in the literature.Comment: 1+13 pages. Revised version. New title and abstract. Extended
  introduction and several sentences have been inserted. Final version to
  appear in Physics Letters
$^{56}Ni$ dredge-up in Supernova 1987A

We use early-time observations of He I 10830 Å to measure the extent of upward mixing of radioactive material in SN 1987A. This work develops and extends the work of Graham (1988), and places constraints on actual explosion models. The presence of the He I 10830 Å (2s^{3}S--2p^{3}P) line at upwardly-mixed radioactive material produced during the explosion. Using the unmixed explosion model 10H (Woosley 1988) as well as mixed versions of it, we estimated the $\gamma$-ray energy deposition by applying a purely absorptive radiative transfer calculation. The deposition energy was used to find the ionisation balance as a function of radius, and hence the 2s$^{3}$S population density profile. This was then applied to a spectral synthesis model and the synthetic spectra were compared with the observations. Neither model 10H nor the mixed version, 10HMM, succeeded in reproducing the observed He I 10830 Å line. The discrepancy with the data found for 10HMM is particularly significant, as this model has successfully reproduced the X-ray and the He I line profile is achieved by reducing the extent of mixing in 10HMM. Our reduced-mixing models also reproduce the observed $\gamma$-ray line light curves and the iron-group velocities deduced from late-time infrared line profiles. We suggest that the He I line method provides a more sensitive measure of the extent of mixing in a type II supernova explosion