Publications (212)0 Total impact

Article: Inclusive search for a vectorlike T quark with charge 2/3 in pp collisions at sqrt(s) = 8 TeV
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ABSTRACT: A search is performed for a massive new vectorlike quark T, with charge 2/3, that is pair produced together with its antiparticle in protonproton collisions. The data were collected by the CMS experiment at the Large Hadron Collider in 2012 at sqrt(s) = 8 TeV and correspond to an integrated luminosity of 19.5 inverse femtobarns. The T quark is assumed to decay into three different final states, bW, tZ, and tH. The search is carried out using events with at least one isolated lepton. No deviations from standard model expectations are observed, and lower limits are set on the T quark mass at 95% confidence level. The lower limit lies between 687 and 782 GeV for all possible values of the branching fractions into the three different final states assuming strong production. These limits are the most stringent constraints to date on the existence of such a quark.Phys.Lett. 01/2014; B729:149171.  [Show abstract] [Hide abstract]
ABSTRACT: A peaking structure in the J/psi phi mass spectrum near threshold is observed in B(+/) to J/psi phi K(+/) decays, produced in pp collisions at sqrt(s) = 7 TeV collected with the CMS detector at the LHC. The data sample, selected on the basis of the dimuon decay mode of the J/psi, corresponds to an integrated luminosity of 5.2 inverse femtobarns. Fitting the structure to an Swave relativistic BreitWigner lineshape above a threebody phasespace nonresonant component gives a signal statistical significance exceeding five standard deviations. The fitted mass and width values are m=4148.0 +/ 2.4 (stat.) +/ 6.3 (syst.) MeV and Gamma=28 11+15 (stat.) +/ 19 (syst.) MeV, respectively. Evidence for an additional peaking structure at higher J/psi phi mass is also reported.Phys.Lett. 01/2014; B734:261.  01/2014;
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 JHEP. 01/2014; 1402:024.
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 JHEP. 01/2014; 1401:096.

Article: Description and performance of track and primaryvertex reconstruction with the CMS tracker
01/2014;  01/2014;
 JHEP. 01/2014; 1406:055.
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ABSTRACT: The properties of a Higgs boson candidate are measured in the H to ZZ to 4l decay channel, with l=e,mu, using data from pp collisions corresponding to an integrated luminosity of 5.1 inverse femtobarns at centerofmass energy of sqrt(s)=7 TeV and 19.7 inverse femtobarns at sqrt(s)=8 TeV, recorded with the CMS detector at the LHC. The new boson is observed as a narrow resonance with a local significance of 6.8 standard deviations, a measured mass of 125.6+/0.4 (stat.) +/0.2 (syst.) GeV, and a total width less than 3.4 GeV at a 95% confidence level. The production cross section of the new boson times the branching fraction to four leptons is measured to be 0.93+0.26/0.23 (stat.) +0.13/0.09} (syst.) times that predicted by the standard model. Its spinparity properties are found to be consistent with the expectations for the standard model Higgs boson. The hypotheses of a pseudoscalar and all tested spinone boson hypotheses are excluded at a 99% confidence level or higher. All tested spintwo boson hypotheses are excluded at a 95% confidence level or higher.Phys.Rev. 01/2014; D89:092007.  01/2014;
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ABSTRACT: Measurements of W gamma and Z gamma production in protonproton collisions at sqrt(s) = 7 TeV are used to extract limits on anomalous triple gauge couplings. The results are based on data recorded by the CMS experiment at the LHC that correspond to an integrated luminosity of 5.0 inverse femtobarns. The cross sections are measured for photon transverse momenta pt[gamma] > 15 GeV, and for separations between photons and finalstate charged leptons in the pseudorapidityazimuthal plane of Delta R[l, gamma] > 0.7 in l nu gamma and ll gamma final states, where l refers either to an electron or a muon. A dilepton invariant mass requirement of m[ll] > 50 GeV is imposed for the Z gamma process. No deviations are observed relative to predictions from the standard model, and limits are set on anomalous WW gamma, ZZ gamma, and Z gamma gamma triple gauge couplings.Phys.Rev. 01/2014; D89:092005.  01/2014;
 Eur.Phys.J. 01/2014; C74:2951.
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