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.

Measurement of the helicity of W bosons in top-quark decays / Abulencia, A., Acosta, D., Adelman, J., Affolder, T., Akimoto, T., Albrow, M.g., Ambrose, D., Amerio, S., Amidei, D., Anastassov, A., Anikeev, K., Annovi, A., Antos, J., Aoki, M., Apollinari, G., Arguin, J.f., Arisawa, T., Artikov, A., Ashmanskas, W., Attal, A., et al.. - In: PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY. - ISSN 1550-7998. - 73:11(2006). [10.1103/physrevd.73.111103]

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

DE CECCO, Sandro;DIONISI, Carlo;GIAGU, Stefano;MARGAROLI, Fabrizio;LOVERRE, Pier Ferruccio;MESSINA, Andrea;
2006

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
01 Pubblicazione su rivista::01a Articolo in rivista
Measurement of the helicity of W bosons in top-quark decays / Abulencia, A., Acosta, D., Adelman, J., Affolder, T., Akimoto, T., Albrow, M.g., Ambrose, D., Amerio, S., Amidei, D., Anastassov, A., Anikeev, K., Annovi, A., Antos, J., Aoki, M., Apollinari, G., Arguin, J.f., Arisawa, T., Artikov, A., Ashmanskas, W., Attal, A., et al.. - In: PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY. - ISSN 1550-7998. - 73:11(2006). [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/11573/361608
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