Measurement of the helicity fractions of W bosons from top quark decays using fully reconstructed tt¯ events with CDF II

A. Abulencia, J. Adelman,T. Affolder,T. Akimoto,M. Albrow,D. Ambrose,S. Amerio, D. Amidei, A. Anastassov,K. Anikeev,A. Annovi, J. Antos,M. Aoki, G. Apollinari,J.-F. Arguin,T. Arisawa,A. Artikov,W. Ashmanskas,A. Attal, F. Azfar,P. Azzi-Bacchetta, P. Azzurri, N. Bacchetta,W. Badgett, A. Barbaro-Galtieri,V. Barnes,B. Barnett,S. Baroiant,V. Bartsch,G. Bauer, F. Bedeschi, S. Behari, S. Belforte, G. Bellettini, J. Bellinger, A. Belloni, D. Benjamin, A. Beretvas, J. Beringer, T. Berry, A. Bhatti, M. Binkley, D. Bisello,R. Blair,C. Blocker, B. Blumenfeld, A. Bocci,A. Bodek, V. Boisvert, G. Bolla,A. Bolshov,D. Bortoletto, J. Boudreau, A. Boveia, B. Brau, L. Brigliadori, C. Bromberg,E. Brubaker, J. Budagov,H. Budd,S. Budd,S. Budroni, K. Burkett, G. Busetto, P. Bussey,K. Byrum,S. Cabrera, M. Campanelli, M. Campbell, F. Canelli, A. Canepa,S. Carillo,D. Carlsmith,R. Carosi,M. Casarsa, A. Castro, P. Catastini, D. Cauz, M. Cavalli-Sforza, A. Cerri, L. Cerrito,S. Chang,Y. Chen, M. Chertok,G. 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PHYSICAL REVIEW D(2007)

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摘要
We present a measurement of the fractions F-0 and F+ of longitudinally polarized and right-handed W bosons in top-quark decays using data collected with the CDF II detector. The data set used in the analysis corresponds to an integrated luminosity of approximately 318 pb(-1). We select t (t) over bar candidate events with one lepton, at least four jets, and missing transverse energy. Our helicity measurement uses the decay angle theta(*), which is defined as the angle between the momentum of the charged lepton in the W boson rest frame and the W momentum in the top-quark rest frame. The cos theta(*) distribution in the data is determined by full kinematic reconstruction of the t (t) over bar candidates. We find F-0=0.85(-0.22)(+0.15)(stat)+/- 0.06(syst) and F+=0.05(-0.05)(+0.11)(stat)+/- 0.03(syst), which is consistent with the standard model prediction. We set an upper limit on the fraction of right-handed W bosons of F+< 0.26 at the 95% confidence level.
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top quark decays,helicity fractions,of<i>w</i>bosons
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