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Compact Muon Solenoid
LHC, CERN

CMS-PAS-TOP-14-017
Measurement of the W boson helicity using tˉt events in the dilepton final state at s= 8 TeV
Abstract: A measurement of the W boson helicity fractions in top quark decays is presented. The measurement is performed using a sample of top quark pair events with two opposite-sign leptons (electron or muon) in the final state. The sample was recorded in proton-proton collisions at a center-of-mass energy of 8 TeV, and corresponds to an integrated luminosity of 19.7fb1. The longitudinal, left-handed and right-handed helicity fractions are measured to be F0=0.653±0.016(stat)±0.024(syst), FL=0.329±0.009(stat)±0.025(syst) and FR=0.018±0.008(stat)±0.026(syst), respectively. The results are found to be in agreement with predictions of the standard model.
CMS Publications
Compact Muon Solenoid
LHC, CERN