Helicity of the W boson in lepton + jets tt̄ events

Helicity of the W boson in lepton + jets tt̄ events

We examine properties of tt̄ 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 tt̄ final state, as a function of the helicity of the W boson....

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Bibliographic Details
Main Authors: Abazov, V, Abbott, B, Abdesselam, A, Abolins, M, Abramov, V, Acharya, B, Adams, D, Adams, M, Ahmed, SN, Alexeev, G, Alton, A, Alves, G, Arnoud, Y, Avila, C, Babintsev, V, Babukhadia, L, Bacon, T, Baden, A, Baffioni, S, Baldin, B, Balm, P, Banerjee, S, Barberis, E, Baringer, P, Barreto, J
Format: Journal article
Language:English
Published: 2005
Description
Summary:We examine properties of tt̄ 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 tt̄ 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 pp̄ Collider at s=1.8 TeV, we obtain a longitudinal helicity fraction F0=0.56±0.31, consistent with the prediction of F0=0.70 from the standard model. © 2005 Elsevier B.V. All rights reserved.

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