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 (p) over barp 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 ->center dot nu b (where center dot=e or mu), and the transverse momentum of the charged lepton. Constrained fits yield F(0)=0.74(-0.34)(+0.22), and F(+)< 0.27 at the 95% confidence level. These measurements are consistent with the standard model predictions.

A., A., D., A., J., A., T., A., T., A., M. G., A., et al. (2006). Measurement of the helicity of W bosons in top-quark decays. PHYSICAL REVIEW. D. PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 73(11) [10.1103/PhysRevD.73.111103].

Measurement of the helicity of W bosons in top-quark decays

PAOLETTI, RICCARDO;
2006-01-01

Abstract

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 (p) over barp 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 ->center dot nu b (where center dot=e or mu), and the transverse momentum of the charged lepton. Constrained fits yield F(0)=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
A., A., D., A., J., A., T., A., T., A., M. G., A., et al. (2006). Measurement of the helicity of W bosons in top-quark decays. PHYSICAL REVIEW. D. PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 73(11) [10.1103/PhysRevD.73.111103].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/39086
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