pinecone/core-2020-05-10-deduplication huggingface dataset:
Dark matter searches with a mono-Z ′ jet

We study collider signatures of a class of dark matter models with a GeV-scale dark Z ′ . At hadron colliders, the production of dark matter particles naturally leads to associated production of the Z ′ , which can appear as a narrow jet after it decays hadronically. Contrary to the usual mono-jet signal from initial state radiation, the final state radiation of dark matter can generate the signature of a mono- Z ′ jet plus missing transverse energy. Performing a jet-substructure analysis to tag the Z ′ jet, we show that these Z ′ jets can be distinguished from QCD jets at high significance. Compared to mono-jets, a dedicated search for mono- Z ′ jet events can lead to over an order of magnitude stronger bounds on the interpreted dark matter-nucleon scattering cross sections
S-wave Kπ scattering in chiral perturbation theory with resonances

32 páginas, 6 figuras, 2 tablas.-- PACS: 11.80.Et; 12.39.Fe; 13.75.Lb; 13.85.Fb.-- arXiv:hep-ph/0006045v1We present a detailed analysis of S-wave Kπ scattering up to 2 GeV, making use of the resonance chiral Lagrangian predictions together with a suitable unitarisation method. Our approach incorporates known theoretical constraints at low and high energies. The present experimental status, with partly conflicting data from different experiments, is discussed. Our analysis allows to resolve some experimental ambiguities, but better data are needed in order to determine the cross-section in the higher-energy range. Our best fits are used to determine the masses and widths of the relevant scalar resonances in this energy region.This work has been supported in part by the German–Spanish Cooperation Agreement\ud
HA97-0061, by the European Union TMR Network EURODAPHNE (ERBFMX-CT98-\ud
0169), and by DGESIC (Spain) under the grants no. PB97-1261 and PB96-0753. M.J.\ud
would like to thank the Deutsche Forschungsgemeinschaft for support.Peer reviewe
Human Cdc14A becomes a cell cycle gene in controlling Cdk1 activity at the G2/M transition

Cdc14 belongs to a dual-specificity\ud
phosphatase family highly conserved\ud
through evolution that preferentially\ud
reverses CDK (Cyclin dependent\ud
kinases)-dependent phosphorylation\ud
events. In the yeast Saccharomyces cerevisiae,\ud
Cdc14 is an essential regulator of\ud
late mitotic stages and exit from mitosis\ud
by counteracting CDK activity at the end\ud
of mitosis. However, many studies have\ud
shown that Cdc14 is dispensable for exiting\ud
mitosis in all other model systems\ud
analyzed. In fission yeast, the Cdc14\ud
homolog Flp1/Clp1 regulates the stability\ud
of the mitotic inducer Cdc25 at the\ud
end of mitosis to ensure Cdk1 inactivation\ud
before cytokinesis. We have recently\ud
reported that human Cdc14A, the Cdc14\ud
isoform located at the centrosomes during\ud
interphase, downregulates Cdc25\ud
activity at the G2/M transition to prevent\ud
premature activation of Cdk1-Cyclin B1\ud
complexes and untimely entry into mitosis.\ud
Here we speculate about new molecular\ud
mechanisms for Cdc14A and discuss\ud
the current evidence suggesting that\ud
Cdc14 phosphatase plays a role in cell\ud
cycle control in higher eukaryotes.Peer reviewe
Search for the standard model Higgs boson decaying into two photons in pp collisions at √s=7TeV

This article is published Open Access at sciencedirect.com. It is distributed under the terms of the Creative Commons Attribution License 3.0.-- et al.A search for a Higgs boson decaying into two photons is described. The analysis is performed using a dataset recorded by the CMS experiment at the LHC from pp collisions at a center-of-mass energy of 7 TeV, which corresponds to an integrated luminosity of 4.8 fb -1. Limits are set on the cross section of the standard model Higgs boson decaying to two photons. The expected exclusion limit at 95% confidence level is between 1.4 and 2.4 times the standard model cross section in the mass range between 110 and 150 GeV. The analysis of the data excludes, at 95% confidence level, the standard model Higgs boson decaying into two photons in the mass range 128 to 132 GeV. The largest excess of events above the expected standard model background is observed for a Higgs boson mass hypothesis of 124 GeV with a local significance of 3.1σ. The global significance of observing an excess with a local significance ≥3.1σ anywhere in the search range 110-150 GeV is estimated to be 1.8σ. More data are required to ascertain the origin of this excess. © 2012 CERN.European Commission; Federal Ministry of Science, Research and Economy (Austria); Agency for Innovation by Science and Technology (Belgium); Conselho Nacional de Desenvolvimento Científico e Tecnológico (Brasil); Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (Brasil); Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro; Fundação de Amparo à Pesquisa do Estado de São Paulo; Colciencias (Colombia); Ministry of Science, Education and Sports of the Republic of Croatia; Research Promotion Foundation (Cyprus); Centre National de la Recherche Scientifique (France); Bundesministerium für Bildung und Forschung (Deutschland); Deutsche Forschungsgemeinschaft; General Secretariat of Research and Technology (Greece); National Office for Research and Technology (Hungary); Institute for Research in Fundamental Sciences (Iran); Science Foundation Ireland; Istituto Nazionale di Fisica Nucleare (Italia); National Research Foundation of Korea; Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (México); Consejo Nacional de Ciencia y Tecnología (México); Secretaría de Educación Pública (México); Universidad Autónoma de San Luis Potosí; Pakistan Atomic Energy Commission; Fundação para a Ciência e a Tecnologia (Portugal); Joint Institute for Nuclear Research (Russia); Russian Foundation for Basic Research; Ministry of Education, Science and Technological Development (Serbia); Ministerio de Ciencia e Innovación (España); Centro Nacional de Física de Partículas, Astropartículas y Nuclear (España); Swiss National Science Foundation; The Scientific and Technological Research Council of Turkey; Turkish Atomic Energy Authority; Alfred P. Sloan Foundation; Alexander von Humboldt Foundation; Science and Technology Facilities Council (UK); Department of Energy (US); National Science Foundation (US).Peer Reviewe
Outpatient laparoscopic cholecystectomy in Hong Kong Chinese - An outcome analysis

BACKGROUND: Laparoscopic cholecystectomy (LC) is now the procedure of choice for symptomatic gallbladder disease. Although many recent studies, mostly from abroad, report that it can be performed safely in the outpatient setting, the experience of outpatient LC in Hong Kong is still limited. This retrospective study evaluated the feasibility, safety and patient acceptance of outpatient LC in Hong Kong Chinese patients. PATIENTS AND METHODS: The data of 73 consecutive patients who had undergone outpatient LC between February 2000 and October 2002 in the Day Surgery Centre of Tung Wah Hospital were prospectively collected and reviewed. The selection criteria for patients undergoing outpatient LC included American Society of Anesthesiologists risk classification I or II, age less than 70 years, and the availability of a competent adult to accompany the patient home and look after them for 24 hours. No effort was made to exclude complicated cases. After assessment by the operating surgeon, patients were discharged from the Day Surgery Centre in the afternoon when their clinical condition satisfied pre-defined discharge criteria. All patients were followed up in the Day Surgery Centre in the first and fourth postoperative weeks. RESULTS: The same-day discharge rate was 88% and the conversion rate was 4%. Six patients (8.2%) with uneventful LC required hospitalization after the procedure. There was no major complication and no unplanned admission. Two patients had port site wound infection requiring hospital admission at the first follow-up. Patient satisfaction was high, pain acceptance was good, and analgesic consumption was minimal. Mild fat intolerance was common in patients postoperatively (> 50%), but this had almost all resolved by postoperative week four. All patients were able to resume their usual daily activities within 2 weeks after surgery. CONCLUSIONS: LC is a safe and feasible outpatient procedure in Hong Kong, with high levels of patient satisfaction. A prospective study with a larger patient population is warranted to verify whether it should be recommended as treatment for gallstone disease in selected patients in future.postprin
Resolvent estimates for high-contrast elliptic problems with periodic coefficients

We study the asymptotic behaviour of the resolvents \({(\mathcal{A}^\varepsilon+I)^{-1}}\) of elliptic second-order differential operators \({{\mathcal{A}}^\varepsilon}\) in \({\mathbb{R}^d}\) with periodic rapidly oscillating coefficients, as the period \({\varepsilon}\) goes to zero. The class of operators covered by our analysis includes both the “classical” case of uniformly elliptic families (where the ellipticity constant does not depend on \({\varepsilon}\)) and the “double-porosity” case of coefficients that take contrasting values of order one and of order \({\varepsilon^2}\) in different parts of the period cell. We provide a construction for the leading order term of the “operator asymptotics” of \({(\mathcal{A}^\varepsilon+I)^{-1}}\) in the sense of operator-norm convergence and prove order \({O(\varepsilon)}\) remainder estimates
A national epidemiological study investigating risk factors for police interrogation and false confession among juveniles and young persons.

To access publisher's full text version of this article, please click on the hyperlink in Additional Links field or click on the hyperlink at the top of the page marked Files.\ud
This article is open access.The principal aims of this study are to identify risk factors associated with police arrest and false confessions and to investigate whether the severity of the ADHD condition/symptoms increases the risk.22,226 young persons in Iceland anonymously completed self-report questionnaires screening for conduct disorder and ADHD. In addition, they stated whether they had a diagnosis of ADHD and had received ADHD medication, and their history of offending, police interrogation and false confession. Participants were stratified into two age groups, 14-16 and 17-24 years.The older group was significantly more likely to have been interrogated by the police but the younger group were much more vulnerable to false confession during interrogation. Males were more likely to be at risk for both than females. The severity of the ADHD condition increased the risk of both interrogation and false confession. Negative binomial regressions showed that age, gender, conduct disorder, offending, and ADHD symptoms were all significant predictors of both interrogations and number of false confessions. Conduct disorder was the single best predictor of police interrogation, but the findings were more mixed regarding false confessions. Young people presenting with a combination of severe ADHD and comorbid conduct disorder had the worst outcome for both interrogation and false confessions.The findings endorse the need for support of persons with ADHD to be put in place to ensure fair due process and to prevent miscarriages of justice
Deliverable # D3.01.4 Probability of occurrence for earthquakes generated by individual faults and the associated uncertainties

Probabilities and uncertainties were calculated based on the approach developed by Akinci et al. (2008). The method was applied to the whole Italian territory using a dataset that integrates individual seismogenic sources derived from both geological/geophysical data and macroseismic data (see Basili et al., 2008, for definitions). We designed two model approaches: one that uses geological slip rates; another that uses slip rates derived from the finite element model developed by Barba et al, 2007. As for recurrence we adopted the Poisson and the Renewal BPT models with aperiodicity a equal to 0.3, 0.5 and 0.7, all for a prediction in the next 30 years. Complete results of these procedures are given in tabular form at the end of this document
A search for hidden white dwarfs in the ROSAT EUV survey - II. Discovery of a distant DA+F6/7V binary system in a direction of low-density neutral hydrogen

The ROSAT Wide Field Camera (WFC) survey of the Extreme Ultraviolet (EUV)\ud
has provided us with evidence for the existence of a previously unidentified sample of\ud
hot white dwarfs in unresolved, detached binary systems. These stars are invisible at\ud
optical wavelengths due to the close proximity of their much more luminous companions\ud
(spectral type K or earlier). However, for companions of spectral type ∼A5 or\ud
later the white dwarfs are easily visible at far-ultraviolet (far-UV) wavelengths, and\ud
can be identified in spectra taken by IUE. Sixteen such systems have been discovered\ud
in this way through ROSAT, EUVE and IUE observations, including four identified\ud
by us in Paper I (Burleigh, Barstow and Fleming 1997). In this paper we report the\ud
results of our continuing search during the final year of IUE operations. One new system,\ud
RE J0500−364 (DA+F6/7V), has been identified. This star appears to lie at a\ud
distance of between\ud
∼500\ud
−1000pc, making it one of the most distant white dwarfs, if\ud
not the most distant, to be detected in the EUV surveys. The very low line-of-sight\ud
neutral hydrogen volume density to this object could place a lower limit on the length\ud
of the\ud
β CMa interstellar tunnel of diffuse gas, which stretches away from the Local\ud
Bubble in a similar direction to RE J0500\ud
−364.\ud
In this paper we also analyse a number of the stars observed where no white dwarf\ud
companion was found. Some of these objects show evidence for chromospheric and\ud
coronal activity. Finally, we present an analysis of the previously known WD+active\ud
F6V binary HD27483 (B¨ohm-Vitense 1993), and show that, at T\ud
≈22,000K, the white\ud
dwarf may be contributing significantly to the observed EUV flux. If so, it is one of\ud
the coolest such stars to be detected in the EUV surveys3911
Simulating spin dynamics in organic solids under heteronuclear decoupling.

Although considerable progress has been made in simulating the dynamics of multiple coupled nuclear spins, predicting the evolution of nuclear magnetisation in the presence of radio-frequency decoupling remains challenging. We use exact numerical simulations of the spin dynamics under simultaneous magic-angle spinning and RF decoupling to determine the extent to which numerical simulations can be used to predict the experimental performance of heteronuclear decoupling for the CW, TPPM and XiX sequences, using the methylene group of glycine as a model system. The signal decay times are shown to be strongly dependent on the largest spin order simulated. Unexpectedly large differences are observed between the dynamics with and without spin echoes. Qualitative trends are well reproduced by modestly sized spin system simulations, and the effects of finite spin-system size can, in favourable cases, be mitigated by extrapolation. Quantitative prediction of the behaviour in complex parameter spaces is found, however, to be very challenging, suggesting that there are significant limits to the role of numerical simulations in RF decoupling problems, even when specialist techniques, such as state-space restriction, are used
Students' perceptions of assessment in undergraduate mathematics

This is an Accepted Manuscript of an article published by Taylor & Francis in Research in Mathematics Education on 7th January 2013, available online: http://dx.doi.org/10.1080/14794802.2012.756634A consistent message emerges from research on undergraduate students’ perceptions of assessment which describes traditional assessment as detrimental to learning. However this literature has not included students in the pure sciences. Mathematics education literature advocates the introduction of innovative assessment at university. In this literature however students’ voices tend to be unheard. We investigate mathematics students’ perceptions of assessment at one high-ranking UK University. We find that, in contrast to the message from the general literature, students perceive traditional assessment as the best discriminator of ability. We suggest that the drive towards the introduction of innovative assessment in mathematics should be considered in the light of students’ perceptions and that further research is needed to investigate the origins of those perceptions as well as how those perceptions may be influenced by the subject of study
Long-lived K isomer and enhanced gamma vibration in the neutron-rich nucleus 172Dy: Collectivity beyond double midshell

The level structure of 172Dy has been investigated for the first time by means of decay spectroscopy following in-flight fission of a 238U beam. A long-lived isomeric state with T1/2 = 0.71(5) s and K π = 8 − has been identified at 1278 keV, which decays to the ground-state and γ-vibrational bands through hindered electromagnetic transitions, as well as to the daughter nucleus 172Ho via allowed β decays. The robust nature of the K π = 8 − isomer and the ground-state rotational band reveals an axially-symmetric structure for this nucleus. Meanwhile, the γ-vibrational levels have been identified at unusually low excitation energy compared to the neighboring well-deformed nuclei, indicating the significance of the microscopic effect on the non-axial collectivity in this doubly mid-shell region. The underlying mechanism of enhanced γ vibration is discussed in comparison with the deformed Quasiparticle Random-Phase Approximation based on a Skyrme energy-density functional
A transformation approach for efficient evaluation of\ud
oscillatory surface integrals arising in three-dimensional\ud
boundary element methods

We propose a method for efficient evaluation of surface integrals arising in boundary element\ud
methods for three-dimensional Helmholtz problems (with real positive wavenumber k), modelling\ud
wave scattering and/or radiation in homogeneous media. To reduce the number of degrees of\ud
freedom required when k is large, a common approach is to include in the approximation space\ud
oscillatory basis functions, with support extending across many wavelengths. A difficulty with this\ud
approach is that it leads to highly oscillatory surface integrals whose evaluation by standard\ud
quadrature would require at least O(k2) quadrature points. Here, we use equivalent contour\ud
integrals developed for aperture scattering in optics to reduce this requirement to O(k), and\ud
possible extensions to reduce it further to O(1)are identified. The contour integral is derived for\ud
arbitrary shaped elements, but its application is limited to planar elements in many cases. In\ud
addition, the transform regularises the singularity in the surface integrand caused by the Green’s\ud
function, including for the hyper-singular case under appropriate conditions. An open-source\ud
Matlab™ code library is available to demonstrate our routines
Azimuthal decorrelation of jets widely separated in rapidity in pp
  collisions at sqrt(s) = 7 TeV

The decorrelation in the azimuthal angle between the most forward and the
most backward jets (Mueller-Navelet jets) is measured in data collected in pp
collisions with the CMS detector at the LHC at sqrt(s) = 7 TeV. The measurement
is presented in the form of distributions of azimuthal-angle differences,
Delta(phi), between the Mueller-Navelet jets, the average cosines of (pi -
Delta(phi)), 2(pi - Delta(phi)), and 3(pi - Delta(phi)), and ratios of these
cosines. The jets are required to have transverse momenta, pT, in excess of 35
GeV and rapidities, |y|, of less than 4.7. The results are presented as a
function of the rapidity separation, Delta(y), between the Mueller-Navelet
jets, reaching Delta(y) up to 9.4 for the first time. The results are compared
to predictions of various Monte Carlo event generators and to analytical
predictions based on the DGLAP and BFKL parton evolution schemes.Comment: Replaced with published version. Added the journal reference and DOI.
  All figures and tables can be found at
  http://cms-results.web.cern.ch/cms-results/public-results/publications/FSQ-12-002/index.htm
GU Mon, a high-mass eclipsing overcontact binary in the young open
  cluster Dolidze 25

Context. The eclipsing binary GU Mon is located in the star-forming cluster
Dolidze 25, which has the lowest metallicity measured in a Milky Way young
cluster. Aims. GU Mon has been identified as a short-period eclipsing binary
with two early B-type components. We set out to derive its orbital and stellar
parameters. Methods. We present a comprehensive analysis, including B and V
light curves and 11 high-resolution spectra, to verify the orbital period and
determine parameters. We use the stellar atmosphere code FASTWIND to obtain
stellar parameters and create templates for cross-correlation. We obtain a
model to fit the light and radial-velocity curves using the Wilson-Devinney
code iteratively and simultaneously. Results. The two components of GU Mon are
identical stars of spectral type B1 V, with the same mass and temperature. The
lightcurves are typical of an EW-type binary. The spectroscopic and photometric
analyses agree on a period of 0.896640 +- 0.000007 d. We determine a mass of
9.0 +- 0.6 Msun for each component and temperatures of 28 000 +- 2 000 K. Both
values are consistent with the spectral type. The two stars are overfilling
their respective Roche lobes, sharing a common envelope, and therefore the
orbit is synchronised and circularised. Conclusions. The GU Mon system has a
fill-out factor above 0.8, containing two dwarf B-type stars on the main
sequence. The two stars are in a very advanced stage of interaction, with their
extreme physical similarity likely due to the common envelope. The expected
evolution of such a system will very probably lead to a merger while still on
the main sequence.Comment: 9 pages, 8 figure
Gauss-Bonnet Gravitational Baryogenesis

In this letter we study some variant forms of gravitational baryogenesis by
using higher order terms containing the partial derivative of the Gauss-Bonnet
scalar coupled to the baryonic current. This scenario extends the well known
theory that uses a similar coupling between the Ricci scalar and the baryonic
current. One appealing feature of the scenario we study is that the predicted
baryon asymmetry during a radiation domination era is non-zero. We calculate
the baryon to entropy ratio for the Gauss-Bonnet term and by using the
observational constraints we investigate which are the allowed forms of the
$R+F(\mathcal{G})$ gravity controlling the evolution. Also we briefly discuss
some alternative higher order terms that can generate a non-zero baryon
asymmetry, even in the conformal invariance limit.Comment: PLB accepte