Helicity of the W Boson in Lepton+Jets ttbar Events
D0 Collaboration
Abstract
We examine properties of ttbar candidates events in lepton+jets final states to establish the helicities of the W bosons in t->W+b decays. Our analysis is based on a direct calculation of a probability that each event corresponds to a ttbar final state, as a function of the helicity of the W boson. We use the 125 events/pb sample of data collected by the DO experiment during Run I of the Fermilab Tevatron collider at sqrts=1.8 TeV, and obtain a longitudinal helicity fraction of F0=0.56+/-0.31, which is consistent with the prediction of F0=0.70 from the standard model.
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