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Journal Articles Physics Letters B Year : 2005

Helicity of the W boson in lepton + jets $t\overline{t}$ events

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V.M. Abazov
B. Abbott
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M. Abolins
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V. Abramov
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B.S. Acharya
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D.L. Adams
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Abstract

We examine properties of $t\overline{t}$ candidate events in lepton + jets final states to establish the helicities of W bosons in $t\rightarrow$W+b$ decays. Our analysis is based on a direct calculation of a probability density for each event to correspond to a $t\overline{t}$ final state, as a function of the helicity of the $W$ boson. Using the 125 events/pb of data collected by the D0 experiment at the Fermilab Tevatron $p\overline{p}$ Collider at $\sqrt{s}$=1.8 TeV, we obtain a longitudinal helicity fraction $F_0$=0.56$\pm$0.31, consistent with the prediction of $F_0$=0.70 from the standard model.

Dates and versions

in2p3-00024201 , version 1 (02-06-2005)

Identifiers

Cite

V.M. Abazov, B. Abbott, Abdelmalek Abdesselam, M. Abolins, V. Abramov, et al.. Helicity of the W boson in lepton + jets $t\overline{t}$ events. Physics Letters B, 2005, 617, pp.1-10. ⟨10.1016/j.physletb.2005.04.069⟩. ⟨in2p3-00024201⟩
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