@article{10902/1971,
year = {2010},
month = {7},
url = {http://hdl.handle.net/10902/1971},
abstract = {We report measurements of the polarization of W bosons from top-quark decays using 2.7 fb-1 of pp̅ collisions collected by the CDF II detector. Assuming a top-quark mass of 175  GeV/c2, three measurements are performed. A simultaneous measurement of the fraction of longitudinal (f0) and right-handed (f+) W bosons yields the model-independent results f0=0.88±0.11(stat)±0.06(syst) and f+=-0.15±0.07(stat)±0.06(syst) with a correlation coefficient of -0.59. A measurement of f0 [f+] constraining f+ [f0] to its standard model value of 0.0 [0.7] yields f0=0.70±0.07(stat)±0.04(syst) [f+=-0.01±0.02(stat)±0.05(syst)]. All these results are consistent with standard model expectations. We achieve the single most precise measurements of f0 for both the model-independent and model-dependent determinations.},
organization = {We thank the Fermilab staff and the technical staffs of
the participating institutions for their vital contributions. This work was supported by the U.S. Department of
Energy and National Science Foundation; the Italian
Istituto Nazionale di Fisica Nucleare; the Ministry of
Education, Culture, Sports, Science and Technology of
Japan; the Natural Sciences and Engineering Research
Council of Canada; the National Science Council of the
Republic of China; the Swiss National Science Foundation; the A. P. Sloan Foundation; the Bundesministerium für Bildung und Forschung, Germany; the World Class University Program, the National Research Foundation of Korea; the Science and Technology Facilities Council and the Royal Society, UK; the Institut National de Physique Nucleaire et Physique des Particules/CNRS; the Russian Foundation for Basic Research; the Ministerio de Ciencia e Innovación, and Programa Consolider-Ingenio 2010, Spain; the Slovak R&D Agency; and the Academy of Finland},
publisher = {American Physical Society},
publisher = {Physical Review Letters, 2010, 105, 042002},
title = {Measurement of W-Boson Polarization in Top-Quark Decay in pp̅ Collisions at √s=1.96  TeV},
author = {Aaltonen, Timo Antero and Álvarez González, Bárbara and Casal Laraña, Bruno and Cuevas Maestro, Francisco Javier and Gómez Gramuglio, Gervasio and Rodrigo Anoro, Teresa and Ruiz Jimeno, Alberto and Scodellaro, Luca and Vila Álvarez, Iván  and Vilar Cortabitarte, Rocío},
}