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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.

Other publications of the same journal or congress with authors from the University of Cantabria

 Authorship: 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

Publisher: Elsevier

 Publication date: 01/05/2013

No. of pages: 7

Publication type: Artículo de Revista

 DOI: 10.1016/j.physletb.2013.03.032

ISSN: 0370-2693,1873-2445

Publication Url: https://doi.org/10.1016/j.physletb.2013.03.032

Authorship

AALTONEN, T.

BRUNO CASAL LARAÑA

FRANCISCO JAVIER CUEVAS MAESTRO

JOSE ENRIQUE PALENCIA CORTEZON