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W-boson polarization measurement in the tt- dilepton channel using the CDF II detector

Abstract: ABSTRACT: We present a measurement of the W -boson polarization in top-quark decays in tt¯ events with decays to dilepton final states using data corresponding to 5.1 fb?1 of integrated luminosity in pp¯ collisions collected by the CDF II detector at the Tevatron. Assuming a top-quark mass of 172.5 GeV/c2, a simultaneous measurement of the fractions of longitudinal ( f0) and right-handed ( f+) W -bosons yields the results f0 = 0.70+0.18 ?0.17(stat) ± 0.06(syst) and f+ = ?0.09 ± 0.09(stat) ± 0.03(syst). Combining this measurement with our previous measurement based on single-lepton final states, we obtain f0 = 0.84 ± 0.09(stat) ± 0.05(syst) and f+ = ?0.16 ± 0.05(stat) ± 0.04(syst). The results are consistent with the standard model expectation.

Autoría: Aaltonen T., Álvarez González B., Amerio S., Amidei D., Anastassov A., Annovi A., Antos J., Apollinari G., Appel J.A., Arisawa T., Artikov A., Asaadi J., Ashmanskas W., Auerbach B., Aurisano A., Azfar F., Badgett W., Bae T., Barbaro-Galtieri A., Barnes V.E., Barnett B.A., Barria P., Bartos P., Bauce M., Bedeschi F., Behari S., Bellettini G., Bellinger J., Benjamin D., Beretvas A., Bhatti A., Bisello D., Bizjak I., Bland K.R., Bl

Fuente: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2013, 711(1-3), 48-54

Editorial: Elsevier

Fecha de publicación: 01/05/2013

Nº de páginas: 7

Tipo de publicación: Artículo de Revista

DOI: 10.1016/j.physletb.2013.03.032

ISSN: 0370-2693,1873-2445

Url de la publicación: https://doi.org/10.1016/j.physletb.2013.03.032

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