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Träfflista för sökning "WFRF:(Haley C. S.) ;pers:(Fox H.);lar1:(kth);pers:(Choudhary B.)"

Sökning: WFRF:(Haley C. S.) > Fox H. > Kungliga Tekniska Högskolan > Choudhary B.

  • Resultat 51-60 av 110
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51.
  • Abazov, V. M., et al. (författare)
  • Search for squarks and gluinos in events with jets and missing transverse energy using 2.1 fb(-1) of p(p)over-bar collision data at root s=1.96 TeV - D phi Collaboration
  • 2008
  • Ingår i: Physics Letters B. - : Elsevier BV. - 0370-2693 .- 1873-2445. ; 660:5, s. 449-457
  • Tidskriftsartikel (refereegranskat)abstract
    • A data sample corresponding to an integrated luminosity of 2.1 fb(-1) collected by the D phi detector at the Fermilab Tevatron Collider was analyzed to search for squarks and gluinos produced in p (p) over bar collisions at a center-of-mass energy of 1.96 TeV. No evidence for the production of such particles was observed in topologies involving jets and missing transverse energy, and 95% C.L. lower limits of 379 GeV and 308 GeV were set on the squark and gluino masses, respectively, within the framework of minimal supergravity with tan beta = 3, A(0) = 0, and mu < 0. The corresponding previous limits are improved by 54 GeV and 67 GeV.
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52.
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53.
  • Abazov, V. M., et al. (författare)
  • Search for scalar top quarks in the acoplanar charm jets and missing transverse energy final state in p(p)over-bar collisions at root s=1.96 TeV
  • 2008
  • Ingår i: Physics Letters B. - : Elsevier BV. - 0370-2693 .- 1873-2445. ; 665:1, s. 1-8
  • Tidskriftsartikel (refereegranskat)abstract
    • We present a search for the pair production of scalar top quarks, (t) over tilde, using 995 pb(-1) of data collected in p (p) over bar collisions with the Dempty set detector at the Fermilab Tevatron Collider at root s = 1.96 TeV. Both scalar top quarks are assumed to decay into a charm quark and a neutralino ((chi) over tilde (0)(1)), where (chi) over tilde (0)(1) is the lightest supersymmetric particle. This leads to a final state with two acoplanar charm jets and missing transverse energy. We find the yield of such events to be consistent with the standard model expectation, and exclude sets of (t) over tilde and (chi) over tilde (0)(1) masses at the 95% C.L. that substantially extend the domain excluded by previous searches.
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54.
  • Abazov, V. M., et al. (författare)
  • Search for decay of a fermiophobic Higgs boson h(f) -> gamma gamma with the D0 detector at root s=1.96 TeV
  • 2008
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 101:5, s. 051801-:101, s. 051801-
  • Tidskriftsartikel (refereegranskat)abstract
    • We report the results of a search for a narrow resonance decaying into two photons in 1.1 fb(-1) of data collected by the D0 experiment at the Fermilab Tevatron Collider during the period 2002-2006. We find no evidence for such a resonance and set a lower limit on the mass of a fermiophobic Higgs boson of m(hf) > 100 GeV at the 95% C.L. This exclusion limit exceeds those obtained in previous searches at the Fermilab Tevatron and covers a significant region of the parameter space B(h(f) -> gamma gamma) vs m(hf) which was not accessible at the CERN Large Electron-Positron Collider.
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55.
  • Abazov, V. M., et al. (författare)
  • Search for large extra dimensions via single photon plus missing energy final states at root s=1.96 TeV
  • 2008
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 101:1, s. 011601-:101, s. 011601-
  • Tidskriftsartikel (refereegranskat)abstract
    • We report on a search for large extra dimensions in a data sample of approximately 1 fb(-1) of p (p) over bar collisions at root s=1.96 TeV. We investigate Kaluza-Klein graviton production with a photon and missing transverse energy in the final state. At the 95% C.L. we set limits on the fundamental mass scale M-D from 884 to 778 GeV for two to eight extra dimensions.
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56.
  • Abazov, V. M., et al. (författare)
  • Search for pair production of doubly charged Higgs bosons in the H++H--->mu(+)mu(+)mu(-)mu(-) final state
  • 2008
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 101:7, s. 071803-:101, s. 071803-
  • Tidskriftsartikel (refereegranskat)abstract
    • We report the results of a search for pair production of doubly charged Higgs bosons via p (p) over bar -> H++H--X ->mu(+)mu(+)mu(-)mu X- at root s=1.96 TeV. We use a data set corresponding to an integrated luminosity of 1.1 fb(-1) collected from 2002 to 2006 by the D0 detector at the Fermilab Tevatron Collider. In the absence of an excess above the standard model background, lower mass limits of M(H-L(+/-+/-))> 150 GeV/c(2) and M(H-R(+/-+/-))> 127 GeV/c(2) at 95% C.L. are set, respectively, for left-handed and right-handed doubly charged Higgs bosons assuming a 100% branching ratio into muons.
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57.
  • Abazov, V. M., et al. (författare)
  • Study of direct CP violation in B-+/--> J/psi K-+/-(pi(+/-)) decays
  • 2008
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 100:21, s. 211802-
  • Tidskriftsartikel (refereegranskat)abstract
    • We present a search for direct CP violation in B-+/- -> J/psi K-+/- (pi(+/-)) decays. The event sample is selected from 2: 8 fb(-1) of p (p) over bar collisions recorded by D0 experiment in run II of the Fermilab Tevatron Collider. The charge asymmetry A(CP)(B+ -> J/psi K+) = +0: 0075 +/- 0: 0061(stat) +/- 0: 0030 (syst) is obtained using a sample of approximately 40 000 B-+/- -> J/psi K-+/- decays. The achieved precision is of the same level as the expected deviation predicted by some extensions of the standard model. We also measured the charge asymmetry A(CP) (B+ -> J/psi pi(+)) = - 0: 09 +/- 0: 08(stat) +/- 0: 03(syst).
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58.
  • Abazov, V. M., et al. (författare)
  • Measurement of the differential cross section for the production of an isolated photon with associated jet in p(p)over-bar collisions at root s=1.96 TeV
  • 2008
  • Ingår i: Physics Letters B. - : Elsevier BV. - 0370-2693 .- 1873-2445. ; 666:5, s. 435-445
  • Tidskriftsartikel (refereegranskat)abstract
    • The process p (p) over bar -> gamma + jet + X is studied using 1.0 fb(-1) of data collected by the DO detector at the Fermilab Tevatron p (p) over bar collider at a center-of-mass energy root s = 1.96 TeV. Photons are reconstructed in the central rapidity region vertical bar y(gamma)vertical bar < 1.0 with transverse momenta in the range 30 < p(T)(gamma) < 400 GeV while jets are reconstructed in either the central vertical bar y(jet)vertical bar < 0.8 or forward 1.5 < vertical bar y(jet)vertical bar < 2.5 rapidity intervals with P-T(jet) > 15 GeV. The differential cross section d(3 sigma)/dp(T)(gamma) dy(gamma) dy(jet) is measured as a function of p(T)(gamma) in four regions, differing by the relative orientations of the photon and the jet in rapidity. Ratios between the differential cross sections in each region are also presented. Next-to-leading order QCD predictions using different parameterizations of parton distribution functions and theoretical scale choices are compared to the data. The predictions do not simultaneously describe the measured normalization and p(T)(gamma) dependence of the cross section in the four measured regions.
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59.
  • Abazov, V. M., et al. (författare)
  • Measurement of the Lifetime of the B-c(+/-) Meson in the Semileptonic Decay Channel
  • 2009
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 102:9, s. 092001-
  • Tidskriftsartikel (refereegranskat)abstract
    • Using approximately 1.3 fb(-1) of data collected by the D0 detector between 2002 and 2006, we measure the lifetime of the B-c(+/-) meson in the B-c(+/-)-> J/psi mu(+/-)+X final state. A simultaneous unbinned likelihood fit to the J/psi+mu invariant mass and lifetime distributions yields a signal of 881 +/- 80(stat) candidates and a lifetime measurement of tau(B-c(+/-))=0.448(-0.036)(+0.038)(stat)+/- 0.032(syst) ps.
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60.
  • Abazov, V. M., et al. (författare)
  • Search for Large Extra Spatial Dimensions in the Dielectron and Diphoton Channels in p(p)over-bar Collisions at root s=1.96 TeV
  • 2009
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 102:5, s. 051601-:102, s. 051601-
  • Tidskriftsartikel (refereegranskat)abstract
    • We report on a search for large extra spatial dimensions in the dielectron and diphoton channels using a data sample of 1: 05 fb(-1) of p (p) over bar collisions at a center-of-mass energy of 1.96 TeV collected by the D0 detector at the Fermilab Tevatron Collider. The invariant mass spectrum of the data agrees well with the prediction of the standard model. We find the most restrictive 95% C. L. lower limits on the effective Planck scale between 2.1 and 1.3 TeV for 2 to 7 extra dimensions.
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  • Resultat 51-60 av 110
Typ av publikation
tidskriftsartikel (110)
Typ av innehåll
refereegranskat (110)
Författare/redaktör
Abbott, B. (110)
Strandberg, Jonas (110)
Begel, M. (110)
Borissov, G. (110)
Brandt, A. (110)
Brock, R. (110)
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Brooijmans, G. (110)
Burdin, S. (110)
Calvet, S. (110)
Chakraborty, D. (110)
Cooke, M. (110)
De, K. (110)
Duflot, L. (110)
Fiedler, F. (110)
Gillberg, D. (110)
Haas, A. (110)
Han, L. (110)
Hensel, C. (110)
Kehoe, R. (110)
Kupco, A. (110)
Kvita, J. (110)
Lammers, S. (110)
Meyer, J. (110)
Piegaia, R. (110)
Pleier, M. -A. (110)
Qian, J. (110)
Rijssenbeek, M. (110)
Sawyer, L. (110)
Schwanenberger, C. (110)
Schwienhorst, R. (110)
Severini, H. (110)
Shabalina, E. (110)
Snyder, S. (110)
Sopczak, A. (110)
Sosebee, M. (110)
Spurlock, B. (110)
Stark, J. (110)
Strandberg, J. (110)
Strauss, M. (110)
Taylor, W. (110)
Tsybychev, D. (110)
Watts, G. (110)
White, A. (110)
Wicke, D. (110)
Yacoob, S. (110)
Zhu, J. (110)
Buescher, V. (110)
Gris, Ph. (110)
Haley, J. (110)
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Uppsala universitet (110)
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Engelska (110)
Forskningsämne (UKÄ/SCB)
Naturvetenskap (110)

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