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Measurement of the Isolated Prompt Photon Production Cross Section in pp Collisions at √s=7 TeV
(2011)Physical Review LettersThe differential cross section for the inclusive production of isolated prompt photons has been measured as a function of the photon transverse energy EγT in pp collisions at √s=7 TeV using data recorded by the CMS detector at the LHC. The data sample corresponds to an integrated luminosity of 2.9 pb−1. Photons are required to have a pseudorapidity |ηγ|<1.45 and EγT>21 GeV, covering the kinematic region 0.006<xT<0.086. The measured ...Journal Article -
First measurement of the cross section for top-quark pair production in proton-proton collisions at √s=7 TeV
(2011)Physics Letters BThe first measurement of the cross section for top-quark pair production in pp collisions at the Large Hadron Collider at center-of-mass energy s=7 TeV has been performed using a data sample corresponding to an integrated luminosity of 3.1±0.3 pb-1 recorded by the CMS detector. This result utilizes the final state with two isolated, highly energetic charged leptons, large missing transverse energy, and two or more jets. Backgrounds from ...Journal Article -
Measurements of inclusive W and Z cross sections in pp collisions at √s=7 TeV
(2011)Journal of High Energy PhysicsMeasurements of inclusive W and Z boson production cross sections in pp collisions at s√=7 TeV are presented, based on 2.9 pb−1 of data recorded by the CMS detector at the LHC. The measurements, performed in the electron and muon decay channels, are combined to give σ(pp→WX)×B(W→ℓν)=9.95±0.07(stat.)±0.28(syst.)±1.09 (lumi.) nb and σ(pp→ZX)×B(Z→ℓ+ℓ−)=0.931±0.026(stat.)±0.023(syst.)±0.102 (lumi.) nb, where ℓ stands for either e or μ. ...Journal Article -
Charged particle multiplicities in pp interactions at √s=0.9 , 2.36, and 7 TeV
(2011)Journal of High Energy PhysicsMeasurements of primary charged hadron multiplicity distributions are presented for non-single-diffractive events in proton-proton collisions at centre-of-mass energies of s√=0.9, 2.36, and 7 TeV, in five pseudorapidity ranges from |η| < 0.5 to |η| < 2.4. The data were collected with the minimum-bias trigger of the CMS experiment during the LHC commissioning runs in 2009 and the 7 TeV run in 2010. The multiplicity distribution at s√=0.9TeV ...Journal Article -
Search for Stopped Gluinos in pp Collisions at √s=7 TeV
(2011)Physical Review LettersThe results of the first search for long-lived gluinos produced in 7 TeV pp collisions at the CERN Large Hadron Collider are presented. The search looks for evidence of long-lived particles that stop in the CMS detector and decay in the quiescent periods between beam crossings. In a dataset with a peak instantaneous luminosity of 1×1032 cm−2 s−1, an integrated luminosity of 10 pb−1, and a search interval corresponding to 62 hours of LHC ...Journal Article -
Search for Quark Compositeness with the Dijet Centrality Ratio in pp Collisions at √s=7 TeV
(2010)Physical Review LettersA search for quark compositeness in the form of quark contact interactions, based on hadronic jet pairs (dijets) produced in proton-proton collisions at √s=7 TeV, is described. The data sample of the study corresponds to an integrated luminosity of 2.9 pb−1 collected with the CMS detector at the LHC. The dijet centrality ratio, which quantifies the angular distribution of the dijets, is measured as a function of the invariant mass of ...Journal Article -
Search for Dijet Resonances in 7 TeV pp Collisions at CMS
(2010)Physical Review LettersA search for narrow resonances in the dijet mass spectrum is performed using data corresponding to an integrated luminosity of 2.9 pb−1 collected by the CMS experiment at the Large Hadron Collider. Upper limits at the 95% confidence level are presented on the product of the resonance cross section, branching fraction into dijets, and acceptance, separately for decays into quark-quark, quark-gluon, or gluon-gluon pairs. The data exclude ...Journal Article -
Observation of long-range, near-side angular correlations in proton-proton collisions at the LHC
(2010)Journal of High Energy PhysicsResults on two-particle angular correlations for charged particles emitted in proton-proton collisions at center-of-mass energies of 0.9, 2.36, and 7TeV are presented, using data collected with the CMS detector over a broad range of pseudorapidity (η) and azimuthal angle (φ). Short-range correlations in Δη, which are studied in minimum bias events, are characterized using a simple "independent cluster" parametrization in order to quantify ...Journal Article