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Study of Z Boson Production in PbPb Collisions at √sNN=2.76 TeV
(2011)Physical Review LettersA search for Z bosons in the μ+μ− decay channel has been performed in PbPb collisions at √sNN=2.76 TeV with the CMS detector at the LHC, in a 7.2 μb−1 data sample. The number of opposite-sign muon pairs observed in the 60–120 GeV/c2 invariant mass range is 39, corresponding to a yield per unit of rapidity (y) and per minimum bias event of [33.8±5.5(stat)±4.4(syst)]×10−8, in the |y|<2.0 range. Rapidity, transverse momentum, and centrality ...Journal Article -
Indications of Suppression of Excited Upsilon States in Pb-Pb Collisions at root(s)NN=2.76 TeV
(2011)Physical Review LettersA comparison of the relative yields of Υ resonances in the μ+μ− decay channel in Pb-Pb and pp collisions at a center-of-mass energy per nucleon pair of 2.76 TeV is performed with data collected with the CMS detector at the LHC. Using muons of transverse momentum above 4 GeV/c and pseudorapidity below 2.4, the double ratio of the Υ(2S) and Υ(3S) excited states to the Υ(1S) ground state in Pb-Pb and pp collisions, [Υ(2S+3S)/Υ(1S)]Pb−Pb/[ ...Journal Article -
Search for supersymmetry in pp collisions at √s=7 TeV in events with two photons and missing transverse energy
(2011)Physical Review LettersA search for supersymmetry in the context of general gauge-mediated breaking with the lightest neutralino as the next-to-lightest supersymmetric particle and the gravitino as the lightest is presented. The data sample corresponds to an integrated luminosity of 36 pb−1 recorded by the CMS experiment at the LHC. The search is performed by using events containing two or more isolated photons, at least one hadronic jet, and significant missing ...Journal Article -
Search for B0s→μ+μ− and B0→μ+μ− Decays in pp Collisions at √s=7 TeV
(2011)Physical Review LettersA search for the rare decays B0s→μ+μ− and B0→μ+μ− is performed in pp collisions at √s=7 TeV, with a data sample corresponding to an integrated luminosity of 1.14 fb−1, collected by the CMS experiment at the LHC. In both cases, the number of events observed after all selection requirements is consistent with expectations from background and standard-model signal predictions. The resulting upper limits on the branching fractions are ...Journal Article -
Dijet Azimuthal Decorrelations in pp Collisions at √s=7 TeV
(2011)Physical Review LettersMeasurements of dijet azimuthal decorrelations in pp collisions at √s=7 TeV using the CMS detector at the CERN LHC are presented. The analysis is based on an inclusive dijet event sample corresponding to an integrated luminosity of 2.9 pb−1. The results are compared to predictions from perturbative QCD calculations and various Monte Carlo event generators. The dijet azimuthal distributions are found to be sensitive to initial-state gluon ...Journal Article -
Search for Pair Production of First-Generation Scalar Leptoquarks in pp Collisions at √s=7 TeV
(2011)Physical Review LettersA search for pair production of first-generation scalar leptoquarks is performed in the final state containing two electrons and two jets using proton-proton collision data at √s=7 TeV. The data sample used corresponds to an integrated luminosity of 33 pb−1 collected with the CMS detector at the CERN LHC. The number of observed events is in good agreement with the predictions for the standard model background processes, and an upper ...Journal Article -
Measurement of the Bs0 Production Cross Section with Bs0→J/ψϕ Decays in pp Collisions at √s=7 TeV
(2011)Physical Review DThe B0s differential production cross section is measured as functions of the transverse momentum and rapidity in pp collisions at √s=7 TeV, using the B0s→J/ψϕ decay, and compared with predictions based on perturbative QCD calculations at next-to-leading order. The data sample, collected by the CMS experiment at the LHC, corresponds to an integrated luminosity of 40 pb−1. The B0s is reconstructed from the decays J/ψ→μ+μ− and ϕ→K+K−. The ...Journal Article -
Search for a Vectorlike Quark with Charge 2/3 in t+Z Events from pp Collisions at √s=7 TeV
(2011)Physical Review LettersA search for pair-produced heavy vectorlike charge-2/3 quarks, T, in pp collisions at a center-of-mass energy of 7 TeV, is performed with the CMS detector at the LHC. Events consistent with the flavor-changing-neutral-current decay of a T quark to a top quark and a Z boson are selected by requiring two leptons from the Z-boson decay, as well as an additional isolated charged lepton. In a data sample corresponding to an integrated luminosity ...Journal Article -
Measurement of the tt ̄ production cross section in pp collisions at 7 TeV in lepton+jets events using b-quark jet identification
(2011)Physical Review DA new measurement of the inclusive production cross section for pp→t¯t is performed at a center-of-mass energy of 7 TeV using data collected by the CMS experiment at the LHC. The analysis uses a data sample corresponding to an integrated luminosity of 36 pb−1, and is based on the final state with one isolated, high transverse momentum muon or electron, missing transverse energy, and hadronic jets. The t¯t content of the selected events ...Journal Article -
Measurement of the differential cross section for isolated prompt photon production in pp collisions at 7 TeV
(2011)Physical Review DA measurement of the differential cross section for the inclusive production of isolated prompt photons in proton-proton collisions at a center-of-mass energy of 7 TeV is presented. The data sample corresponds to an integrated luminosity of 36 pb−1 recorded by the CMS detector at the LHC. The measurement covers the pseudorapidity range |η|<2.5 and the transverse energy range 25<ET<400 GeV, corresponding to the kinematic region 0.007<xT<0.114. ...Journal Article