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S.Verzocchi, M.Villeneuve-Seguier, F.Vlimant, JRVon Toerne, E.Vreeswijk, M.Anh, T. V.Wahl, H. D.Wang, L.Warchol, J.Watts, G.Wayne, M.Weber, M.Weerts, H.Wermes, N.White, A.White, VWicke, D.Wijngaarden, D. A.Wilson, G. W.Wimpenny, S. J.Wittlin, J.Wobisch, M.Womersley, J.Wood, D. R.Wyatt, T. R.Xu, Q.Xuan, N.Yacoob, S.Yamada, R.Yan, M.Yasuda, T.Yatsunenko, Y. A.Yen, Y.Yip, K.Yoo, H. D.Youn, S. W.Yu, J.Yurkewicz, A.Zabi, A.Zatserklyaniy, A.Zdrazil, M.Zeitnitz, C.Zhang, D.Zhang, XZhao, T.Zhao, Z.Zhou, B.Zhu, J.Zielinski, M.Zieminska, D.Zieminski, A.Zitoun, R.Zutshi, VZverev, E. G.2014-05-202014-05-202005-07-01Physical Review D. College Pk: American Physical Soc, v. 72, n. 1, 8 p., 2005.1550-7998http://hdl.handle.net/11449/23071We present a measurement of the fraction f(+) of right-handed W bosons produced in top quark decays, based on a candidate sample of t (t) over bar events in the lepton+jets decay mode. These data correspond to an integrated luminosity of 230 pb(-1), collected by the D0 detector at the Fermilab Tevatron p (p) over bar Collider at root s=1.96 TeV. We use a constrained fit to reconstruct the kinematics of the t (t) over bar and decay products, which allows for the measurement of the leptonic decay angle theta(*) for each event. By comparing the cos theta(*) distribution from the data with those for the expected background and signal for various values of f(+), we find f(+)=0.00 +/- 0.13(stat)+/- 0.07(syst). This measurement is consistent with the standard model prediction of f(+)=3.6 x 10(-4).8engArtigo10.1103/PhysRevD.72.011104WOS:000230889400004Acesso restritoWOS000230889400004.pdf