Speaker
Ms
Yvonne Küssel
(RWTH-Aachen (DE))
Description
Measurement of top quark properties, such as the top quark charge and the flavour contents in top quark pair events is presented using proton-proton collision data recorded with the CMS Experiment at the LHC at a centre-of-mass energy of 7 TeV. For the measurement of the top quark charge, the top quark pair events are reconstructed in the muon+jets final state and different top quark charge hypotheses (2/3e or -4/3e) are discriminated by use of the charge correlations between high-pT muons from W boson decays and soft muons from B-hadron decays in b jets. A normalised asymmetry of events categorised with a charge of either +2/3 e or −4/3 e is calculated. The fraction of top quarks decaying into a W-boson and a b-quark relative to all top quark decays, R=BR(t->Wb)/Sum(BR(t->Wq)), is determined by counting the jets identified as b-jets, using a model that relies on the b-tagging and mistagging efficiencies. The results are found consistent with SM predictions.
Primary author
Ms
Yvonne Küssel
(RWTH-Aachen (DE))
