Helicity of the W Boson in Lepton+Jets ttbar Events

Details Helicity of the W Boson in Lepton+Jets ttbar Events Helicity of the W Boson in Lepton+Jets ttbar Events

2004-04-29

arxiv.org/abs/hep-ex/0404040v1

Phys.Lett.B617:1-10,2005

Physics

High Energy Physics

High Energy Physics - Experiment

Scientific paper

10.1016/j.physletb.2005.04.069

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 sqrt{s}=1.8 TeV, and obtain a longitudinal helicity fraction of F_0=0.56+/-0.31, which is consistent with the prediction of F_0=0.70 from the standard model.

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