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Helicity of the W boson in lepton +jets t ¯t events

Research output: Contribution to journalJournal article


<mark>Journal publication date</mark>26/06/2005
<mark>Journal</mark>Physics Letters B
Issue number1-2
Number of pages10
Pages (from-to)1-10
<mark>Original language</mark>English


We examine properties of candidate events in lepton + jets final states to establish the helicities of W bosons in t→W+b decays. Our analysis is based on a direct calculation of a probability density for each event to correspond to a final state, as a function of the helicity of the W boson. Using the 125 events/pb of data collected by the DØ experiment at the Fermilab Tevatron Collider at , we obtain a longitudinal helicity fraction F0=0.56±0.31, consistent with the prediction of F0=0.70 from the standard model.

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