2,813 research outputs found
The Role of Legal Education in Installing an Ethos of Public Service Among Law Students: Towards a Collaboration between the Profession and the Academy on Professional Values
Minnesota Symposium: Legal Education & Pro Bon
Search for dark matter in events with a hadronically decaying W or Z boson and missing transverse momentum in pp collisions at ās=8āāTeV with the ATLAS detector
A search is presented for dark matter pair production in association with a W or Z boson in pp collisions representing 20.3āāfbā1 of integrated luminosity at sā=8āāTeV using data recorded with the ATLAS detector at the Large Hadron Collider. Events with a hadronic jet with the jet mass consistent with a W or Z boson, and with large missing transverse momentum are analyzed. The data are consistent with the standard model expectations. Limits are set on the mass scale in effective field theories that describe the interaction of dark matter and standard model particles, and on the cross section of Higgs production and decay to invisible particles. In addition, cross section limits on the anomalous production of W or Z bosons with large missing transverse momentum are set in two fiducial regions
Measurement of the electroweak production of dijets in association with a Z-boson and distributions sensitive to vector boson fusion in proton-proton collisions at ās= 8 TeV using the ATLAS detector
Measurements of fiducial cross sections for the electroweak production of two jets in association with a Z-boson are presented. The measurements are performed using 20.3 fbā1 of proton-proton collision data collected at a centre-of-mass energy of sā = 8 TeV by the ATLAS experiment at the Large Hadron Collider. The electroweak component is extracted by a fit to the dijet invariant mass distribution in a fiducial region chosen to enhance the electroweak contribution over the dominant background in which the jets are produced via the strong interaction. The electroweak cross sections measured in two fiducial regions are in good agreement with the Standard Model expectations and the background-only hypothesis is rejected with significance above the 5Ļ level. The electroweak process includes the vector boson fusion production of a Z-boson and the data are used to place limits on anomalous triple gauge boson couplings. In addition, measurements of cross sections and differential distributions for inclusive Z-boson-plus-dijet production are performed in five fiducial regions, each with different sensitivity to the electroweak contribution. The results are corrected for detector effects and compared to predictions from the Sherpa and Powheg event generators
Search for new particles in events with one lepton and missing transverse momentum in pp collisions at sā = 8 TeV with the ATLAS detector
This paper presents a search for new particles in events with one lepton (electron or muon) and missing transverse momentum using 20.3 fbā1 of proton-proton collision data at sā = 8 TeV recorded by the ATLAS experiment at the Large Hadron Collider. No significant excess beyond Standard Model expectations is observed. A W ā² with Sequential Standard Model couplings is excluded at the 95% confidence level for masses up to 3.24 TeV. Excited chiral bosons (W *) with equivalent coupling strengths are excluded for masses up to 3.21 TeV. In the framework of an effective field theory limits are also set on the dark matter-nucleon scattering cross-section as well as the mass scale M * of the unknown mediating interaction for dark matter pair production in association with a leptonically decaying W
Search for supersymmetry at ās= 8 TeV in final states with jets and two same-sign leptons or three leptons with the ATLAS detector
A search for strongly produced supersymmetric particles is conducted using signatures involving multiple energetic jets and either two isolated leptons (e or Ī¼) with the same electric charge, or at least three isolated leptons. The search also utilises jets originating from b-quarks, missing transverse momentum and other observables to extend its sensitivity. The analysis uses a data sample corresponding to a total integrated luminosity of 20.3 fb-1 of ās = 8 TeV proton-proton collisions recorded with the ATLAS detector at the Large Hadron Collider in 2012. No deviation from the Standard Model expectation is observed. New or significantly improved exclusion limits are set on a wide variety of supersymmetric models in which the lightest squark can be of the first, second or third generations, and in which R-parity can be conserved or violated
Search for quantum black hole production in high-invariant-mass lepton + jet final states using pp collisions at ās = 8 TeV and the ATLAS detector
A search is reported for a neutral Higgs boson in the decay channel HāZĪ³, Zāā +ā - (ā = e, Ī¼), using 4.5 fb-1 of pp collisions at s=7 TeV and 20.3 fb-1 of pp collisions at s=8 TeV, recorded by the ATLAS detector at the CERN Large Hadron Collider. The observed distribution of the invariant mass of the three final-state particles, māāĪ³, is consistent with the Standard Model hypothesis in the investigated mass range of 120-150 GeV. For a Higgs boson with a mass of 125.5 GeV, the observed upper limit at the 95% confidence level is 11 times the Standard Model expectation. Upper limits are set on the cross section times branching ratio of a neutral Higgs boson with mass in the range 120-150 GeV between 0.13 and 0.5 pb for s=8 TeV at 95% confidence level
Measurement of the production of a W boson in association with a charm quark in pp collisions at sā = 7 TeV with the ATLAS detector
The production of a W boson in association with a single charm quark is studied using 4.6 fbā1 of pp collision data at sā = 7 TeV collected with the ATLAS detector at the Large Hadron Collider. In events in which a W boson decays to an electron or muon, the charm quark is tagged either by its semileptonic decay to a muon or by the presence of a charmed meson. The integrated and differential cross sections as a function of the pseudorapidity of the lepton from the W-boson decay are measured. Results are compared to the predictions of next-to-leading-order QCD calculations obtained from various parton distribution function parameterisations. The ratio of the strange-to-down sea-quark distributions is determined to be 0.96+0.26ā0.30 at Q 2 = 1.9 GeV2, which supports the hypothesis of an SU(3)-symmetric composition of the light-quark sea. Additionally, the cross-section ratio Ļ(W + + cĀÆ)/Ļ(W ā + c) is compared to the predictions obtained using parton distribution function parameterisations with different assumptions about the sāsĀÆ quark asymmetry
Search for direct pair production of the top squark in all-hadronic final states in proton-proton collisions at ās=8 TeV with the ATLAS detector
The results of a search for direct pair production of the scalar partner to the top quark using an integrated luminosity of 20.1 fbā1 of proton-proton collision data at sā = 8 TeV recorded with the ATLAS detector at the LHC are reported. The top squark is assumed to decay via tĀÆ ātĻĀÆ01 or tĀÆ ābĻĀÆĀ±1 ābW(ā)ĻĀÆ01, where ĻĀÆ01 (ĻĀÆĀ±1) denotes the lightest neutralino (chargino) in supersymmetric models. The search targets a fully-hadronic final state in events with four or more jets and large missing transverse momentum. No significant excess over the Standard Model background prediction is observed, and exclusion limits are reported in terms of the top squark and neutralino masses and as a function of the branching fraction of tĀÆ ātĻĀÆ01. For a branching fraction of 100%, top squark masses in the range 270ā645 GeV are excluded for ĻĀÆ01 masses below 30 GeV. For a branching fraction of 50% to either tĀÆ ātĻĀÆ01 or tĀÆ ābĻĀÆĀ±1, and assuming the ĻĀÆĀ±1 mass to be twice the ĻĀÆ01 mass, top squark masses in the range 250ā550 GeV are excluded for ĻĀÆ01 masses below 60 GeV
Search for supersymmetry in events with large missing transverse momentum, jets, and at least one tau lepton in 20 fbā1 of ās = 8 TeV proton-proton collision data with the ATLAS detector
A search for supersymmetry (SUSY) in events with large missing transverse momentum, jets, at least one hadronically decaying tau lepton and zero or one additional light leptons (electron/muon), has been performed using 20.3fbā1 of proton-proton collision data at ās = 8 TeV recorded with the ATLAS detector at the Large Hadron Collider. No excess above the Standard Model background expectation is observed in the various signal regions and 95% confidence level upper limits on the visible cross section for new phenomena are set. The results of the analysis are interpreted in several SUSY scenarios, significantly extending previous limits obtained in the same final states. In the framework of minimal gauge-mediated SUSY breaking models, values of the SUSY breaking scale Ī below 63 TeV are excluded, independently of tan Ī². Exclusion limits are also derived for an mSUGRA/CMSSM model, in both the R-parity-conserving and R-parity-violating case. A further interpretation is presented in a framework of natural gauge mediation, in which the gluino is assumed to be the only light coloured sparticle and gluino masses below 1090 GeV are excluded
An in-depth view of the microscopic dynamics of Ising spin glasses at fixed temperature
Using the dedicated computer Janus, we follow the nonequilibrium dynamics of
the Ising spin glass in three dimensions for eleven orders of magnitude. The
use of integral estimators for the coherence and correlation lengths allows us
to study dynamic heterogeneities and the presence of a replicon mode and to
obtain safe bounds on the Edwards-Anderson order parameter below the critical
temperature. We obtain good agreement with experimental determinations of the
temperature-dependent decay exponents for the thermoremanent magnetization.
This magnitude is observed to scale with the much harder to measure coherence
length, a potentially useful result for experimentalists. The exponents for
energy relaxation display a linear dependence on temperature and reasonable
extrapolations to the critical point. We conclude examining the time growth of
the coherence length, with a comparison of critical and activated dynamics.Comment: 38 pages, 26 figure
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