Measurement of the helicity of W bosons in top-quark decays
Journal
Physical Review D - Particles, Fields, Gravitation and Cosmology
Journal Volume
73
Journal Issue
11
Date Issued
2006
Author(s)
Abulencia, A. et al. (CDF Collaboration)
Abstract
We measure the branching fraction of the top quark to longitudinally and right-handed polarized W bosons, F0 and F+, using approximately 200pb-1 of p̄p collisions collected by the CDF II detector. We analyze two quantities sensitive to the W helicity: the invariant mass of the charged lepton and the bottom-quark jet in the decay t→Wb→ νb (where =e or μ), and the transverse momentum of the charged lepton. Constrained fits yield F0=0.74-0.34+0.22, and F+<0.27 at the 95% confidence level. These measurements are consistent with the standard model predictions. © 2006 The American Physical Society.
Type
journal article