“School of Particles”
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Paper IPM / Particles / 11900 |
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A measurement of the tt production cross section in proton-proton collisions at a centre-of-mass energy of 7 TeV has been performed at the LHC with the CMS detector. The analysis uses a data sample corresponding to an integrated luminosity of 36 pb(-1) and is based on the reconstruction of the final state with one isolated, high transverse-momentum electron or muon and three or more hadronic jets. The kinematic properties of the events are used to separate the t?t signal from W+jets and QCD multijet background events. The measured cross section is 173(+39)(-32)(stat. + syst.) pb, consistent with standard model expectations
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