Measurement of the Helicity of W Bosons in Top-Quark Decays

Details Measurement of the Helicity of W Bosons in Top-Quark Decays Measurement of the Helicity of W Bosons in Top-Quark Decays

2005-11-08

arxiv.org/abs/hep-ex/0511023v1

Phys.Rev.D73:111103,2006

Physics

High Energy Physics

High Energy Physics - Experiment

7 pages, 4 figures, submitted to Physical Review Letters

Scientific paper

10.1103/PhysRevD.73.111103

We measure the branching fraction of the top quark to longitudinally and right-handed polarized $W$ bosons, $F_0$ and $F_+$, using approximately 200 pb$^{-1}$ of $\bar{p}p$ 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 $t\to Wb \to \ell\nu b$ (where $\ell=e$ or $\mu$), and the transverse momentum of the charged lepton. We find $F_0=0.74^{+0.22}_{-0.34}$, and $F_+<0.27$ at the 95% confidence level. These measurements are in agreement with the standard model predictions.

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