Search for V+A Current in Top-Quark Decays in pp¯ Collisions at s=1.96TeV

A. Abulencia et al. (CDF Collaboration)
Phys. Rev. Lett. 98, 072001 – Published 15 February 2007

Abstract

We report an upper limit on the fraction of V+A current, fV+A, in top-quark decays, using approximately 700pb1 of pp¯ collisions at s=1.96TeV acquired by the upgraded Collider Detector at Fermilab. For the decay tWbνb (where =e or μ), the invariant mass of the charged lepton and the bottom quark jet is sensitive to the polarization of the W boson. We determine fV+A=0.06±0.25 given a top-quark mass of 175GeV/c2. We set an upper limit on fV+A of 0.29 at the 95% confidence level, an improvement by a factor of 2 on the previous best direct limit.

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  • Received 29 August 2006

DOI:https://doi.org/10.1103/PhysRevLett.98.072001

©2007 American Physical Society

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Vol. 98, Iss. 7 — 16 February 2007

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