The production cross section for a W boson and two b jets is measured using proton-proton collisions at âs=7 TeV in a data sample collected with the CMS experiment at the LHC corresponding to an integrated luminosity of 5.0 fb-1. The W+bb- events are selected in the Wâμν decay mode by requiring a muon with transverse momentum pT > 25 GeV and pseudorapidity |η| < 2.1, and exactly two b-tagged jets with pT > 25 GeV and |η| < 2.4. The measured W+bb- production cross section in the fiducial region, calculated at the level of final-state particles, is Ï(ppâW+bb-)ÃB(Wâμν)=0.50.05(stat.) 0.09(syst.)±0.06(theo.)±0.01(lum.) pb, in agreement with the standard model prediction. In addition, kinematic distributions of the W+bb- system are in agreement with the predictions of a simulation using MadGraph and pythia. © 2014 Elsevier B.V.
Measurement of the production cross section for a W boson and two b jets in pp collisions at ââs=7 TeV
ALBERGO, Sebastiano Francesco;CAPPELLO, GIGI;CHIORBOLI, MASSIMILIANO;COSTA, Salvatore;GIORDANO, FERDINANDO;POTENZA, Renato Carlo;TRICOMI, Alessia Rita;TUVE', Cristina Natalina;
2014-01-01
Abstract
The production cross section for a W boson and two b jets is measured using proton-proton collisions at âs=7 TeV in a data sample collected with the CMS experiment at the LHC corresponding to an integrated luminosity of 5.0 fb-1. The W+bb- events are selected in the Wâμν decay mode by requiring a muon with transverse momentum pT > 25 GeV and pseudorapidity |η| < 2.1, and exactly two b-tagged jets with pT > 25 GeV and |η| < 2.4. The measured W+bb- production cross section in the fiducial region, calculated at the level of final-state particles, is Ï(ppâW+bb-)ÃB(Wâμν)=0.50.05(stat.) 0.09(syst.)±0.06(theo.)±0.01(lum.) pb, in agreement with the standard model prediction. In addition, kinematic distributions of the W+bb- system are in agreement with the predictions of a simulation using MadGraph and pythia. © 2014 Elsevier B.V.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.