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Träfflista för sökning "WFRF:(Armbruster A. J.) srt2:(2011)"

Sökning: WFRF:(Armbruster A. J.) > (2011)

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1.
  • Aad, G., et al. (författare)
  • Search for neutral MSSM Higgs bosons decaying to tau(+)tau(-) pairs in proton-proton collisions root s=7 TeV with the ATLAS detector
  • 2011
  • Ingår i: Physics Letters B. - Elsevier Science BV. - 0370-2693. ; 705:3, s. 174-192
  • Tidskriftsartikel (refereegranskat)abstract
    • A search for neutral Higgs bosons decaying to pairs of tau leptons with the ATLAS detector at the LHC is presented. The analysis is based on proton-proton collisions at a center-of-mass energy of 7 TeV, recorded in 2010 and corresponding to an integrated luminosity of 36 pb(-1). After signal selection, 276 events are observed in this data sample. The observed number of events is consistent with the total expected background of 269 +/- 36 events. Exclusion limits at the 95% confidence level are derived for the production cross section of a generic Higgs boson phi as a function of the Higgs boson mass and for A/H/h production in the Minimal Supersymmetric Standard Model (MSSM) as a function of the parameters m(A) and tan beta. (C) 2011 CERN. Published by Elsevier B.V. All rights reserved.
2.
  • Aad, G., et al. (författare)
  • Search for supersymmetry in pp collisions at root s=7 TeV in final states with missing transverse momentum and b-jets
  • 2011
  • Ingår i: Physics Letters B. - Elsevier Science BV. - 0370-2693. ; 701:4, s. 398-416
  • Tidskriftsartikel (refereegranskat)abstract
    • Results are presented of a search for supersymmetric particles in events with large missing transverse momentum and at least one heavy flavour jet candidate in root s = 7 TeV proton proton collisions. In a data sample corresponding to an integrated luminosity of 35 pb(-1) recorded by the ATLAS experiment at the Large Hadron Collider, no significant excess is observed with respect to the prediction for Standard Model processes. For R-parity conserving models in which sbottoms (stops) are the only squarks to appear in the gluino decay cascade, gluino masses below 590 GeV (520 GeV) are excluded at the 95% C.L. The results are also interpreted in an MSUGRA/CMSSM supersymmetry breaking scenario with tan beta = 40 and in an SO(10) model framework. (C) 2011 CERN. Published by Elsevier B.V. All rights reserved.
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3.
  • Aad, G., et al. (författare)
  • Search for the Standard Model Higgs boson in the decay channel H -> ZZ(()*()) -> 4l with the ATLAS detector
  • 2011
  • Ingår i: Physics Letters B. - Elsevier Science BV. - 0370-2693. ; 705:5, s. 435-451
  • Tidskriftsartikel (refereegranskat)abstract
    • A search for the Standard Model Higgs boson in the decay channel H -> ZZ(()*()) l(+)l(-)l'l'(-), where l = e, mu, is presented. Proton-proton collision data at root s = 7 TeV recorded with the ATLAS detector and corresponding to an average integrated luminosity of 2.1 fb(-1) are compared to the Standard Model expectations. Upper limits on the production cross section of a Standard Model Higgs boson with a mass between 110 and 600 GeV are derived. The observed (expected) 95% confidence level upper limit on the production cross section for a Higgs boson with a mass of 194 GeV, the region with the best expected sensitivity for this search, is 0.99 (1.01) times the Standard Model prediction. The Standard Model Higgs boson is excluded at 95% confidence level in the mass ranges 191-197, 199-200 and 214-224 GeV. (C) 2011 CERN. Published by Elsevier B.V. All rights reserved.
4.
  • Aad, G., et al. (författare)
  • Inclusive search for same-sign dilepton signatures in pp collisions at root s=7 TeV with the ATLAS detector
  • 2011
  • Ingår i: Journal of High Energy Physics. - Springer. - 1126-6708. ; :10, s. 107
  • Tidskriftsartikel (refereegranskat)abstract
    • An inclusive search is presented for new physics in events with two isolated leptons (e or mu) having the same electric charge. The data are selected from events collected from p p collisions at root s = 7 TeV by the ATLAS detector and correspond to an integrated luminosity of 34 pb(-1). The spectra in dilepton invariant mass, missing transverse momentum and jet multiplicity are presented and compared to Standard Model predictions. In this event sample, no evidence is found for contributions beyond those of the Standard Model. Limits are set on the cross-section in a fiducial region for new sources of same-sign high-mass dilepton events in the ee, e mu and mu mu channels. Four models predicting same-sign dilepton signals are constrained: two descriptions of Majorana neutrinos, a cascade topology similar to supersymmetry or universal extra dimensions, and fourth generation d-type quarks. Assuming a new physics scale of 1 TeV, Majorana neutrinos produced by an effective operator V with masses below 460 GeV are excluded at 95% confidence level. A lower limit of 290 GeV is set at 95% confidence level on the mass of fourth generation d-type quarks.
5.
  • Aad, G., et al. (författare)
  • Measurement of multi-jet cross sections in proton-proton collisions at a 7 TeV center-of-mass energy
  • 2011
  • Ingår i: European Physical Journal C. - Springer. - 1434-6044. ; 71:11
  • Tidskriftsartikel (refereegranskat)abstract
    • Inclusive multi-jet production is studied in proton-proton collisions at a center-of-mass energy of 7 TeV, using the ATLAS detector. The data sample corresponds to an integrated luminosity of 2.4 pb(-1). Results on multi-jet cross sections are presented and compared to both leading-order plus parton-shower Monte Carlo predictions and to next-to-leading-order QCD calculations.
6.
  • Aad, G., et al. (författare)
  • Measurement of the W charge asymmetry in the W -> mu nu decay mode in pp collisions at root s=7 TeV with the ATLAS detector
  • 2011
  • Ingår i: Physics Letters B. - Elsevier Science BV. - 0370-2693. ; 701:1, s. 31-49
  • Tidskriftsartikel (refereegranskat)abstract
    • This Letter reports a measurement of the muon charge asymmetry from W bosons produced in proton-proton collisions at a centre-of-mass energy of 7 TeV with the ATLAS experiment at the LHC. The asymmetry is measured in the W -> mu nu decay mode as a function of the muon pseudorapidity using a data sample corresponding to a total integrated luminosity of 31 pb(-1). The results are compared to predictions based on next-to-leading order calculations with various parton distribution functions. This measurement provides information on the u and d quark momentum fractions in the proton. (C) 2011 CERN. Published by Elsevier B.V. All rights reserved.
7.
  • Aad, G., et al. (författare)
  • Measurement of the W+W- Cross Section in root s=7 TeV pp Collisions with ATLAS
  • 2011
  • Ingår i: Physical Review Letters. - American Physical Society. - 0031-9007. ; 107:4, s. 041802
  • Tidskriftsartikel (refereegranskat)abstract
    • This Letter presents a measurement of the W+W- production cross section in root s = 7 TeV pp collisions by the ATLAS experiment, using 34 pb(-1) of integrated luminosity produced by the Large Hadron Collider at CERN. Selecting events with two isolated leptons, each either an electron or a muon, 8 candidate events are observed with an expected background of 1.7 +/- 0.6 events. The measured cross section is 41(-16)(+20)(stat) +/- 5(syst) +/- 1(lumi) pb, which is consistent with the standard model prediction of 44 +/- 3 pb calculated at next-to-leading order in QCD.
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8.
  • Aad, G., et al. (författare)
  • Search for pair production of first or second generation leptoquarks in proton-proton collisions at root s=7 TeV using the ATLAS detector at the LHC
  • 2011
  • Ingår i: Physical Review D. - American Physical Society. - 1550-7998. ; 83:11, s. 112006
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper describes searches for the pair production of first or second generation scalar leptoquarks using 35 pb(-1) of proton-proton collision data recorded by the ATLAS detector at root s = 7 TeV. Leptoquarks are searched in events with two oppositely-charged muons or electrons and at least two jets, and in events with one muon or electron, missing transverse momentum and at least two jets. After event selection, the observed yields are consistent with the predicted backgrounds. Leptoquark production is excluded at the 95% CL for masses M-LQ < 376 (319) GeV and M-LQ < 422 (362) GeV for first and second generation scalar leptoquarks, respectively, when assuming the branching fraction of a leptoquark to a charged lepton is equal to 1.0 (0.5).
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9.
  • Aad, G., et al. (författare)
  • Search for squarks and gluinos using final states with jets and missing transverse momentum with the ATLAS detector in root s=7 TeV proton-proton collisions
  • 2011
  • Ingår i: Physics Letters B. - Elsevier Science BV. - 0370-2693. ; 701:2, s. 186-203
  • Tidskriftsartikel (refereegranskat)abstract
    • A search for squarks and gluinos in final states containing jets, missing transverse momentum and no electrons or muons is presented. The data were recorded by the ATLAS experiment in root s = 7 TeV proton-proton collisions at the Large Hadron Collider. No excess above the Standard Model background expectation was observed in 35 pb(-1) of analysed data. Gluino masses below 500 GeV are excluded at the 95% confidence level in simplified models containing only squarks of the first two generations, a gluino octet and a massless neutralino. The exclusion increases to 870 GeV for equal mass squarks and gluinos. In MSUGRA/CMSSM models with tan beta = 3, A(0) = 0 and mu > 0, squarks and gluinos of equal mass are excluded below 775 GeV. These are the most stringent limits to date. (C) 2011 CERN. Published by Elsevier B.V. All rights reserved.
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10.
  • Aad, G., et al. (författare)
  • Limits on the production of the standard model Higgs boson in pp collisions at root s=7 TeV with the ATLAS detector
  • 2011
  • Ingår i: European Physical Journal C. - Springer. - 1434-6044. ; 71:9
  • Tidskriftsartikel (refereegranskat)abstract
    • A search for the Standard Model Higgs boson at the Large Hadron Collider (LHC) running at a centre-of-mass energy of 7 TeV is reported, based on a total integrated luminosity of up to 40 pb(-1) collected by the ATLAS detector in 2010. Several Higgs boson decay channels: H -> gamma gamma, H -> ZZ(()*()) -> llll, H -> ZZ -> LL nu nu, H -> ZZ -> llqq, H -> WW(*()) -> l nu l nu and H -> WW -> l nu qq (l is e, mu) are combined in a mass range from 110 GeV to 600 GeV. The highest sensitivity is achieved in the mass range between 160 GeV and 170 GeV, where the expected 95% CL exclusion sensitivity is at Higgs boson production cross sections 2.3 times the Standard Model prediction. Upper limits on the cross section for its production are determined. Models with a fourth generation of heavy leptons and quarks with Standard Model-like couplings to the Higgs boson are also investigated and are excluded at 95% CL for a Higgs boson mass in the range from 140 GeV to 185 GeV.
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