Measurement Of The Helicity Of W Bosons In Top Quark Decays

T. Affolder,H. Akimoto,A. Akopian,M. G. Albrow, P. Amaral,S. R. Amendolia, D. Amidei, J. Antos, G. Apollinari,T. Arisawa,T. Asakawa,W. Ashmanskas,M. Atac,P. Azzi-Bacchetta, N. Bacchetta,M. W. Bailey,S. Bailey,P. de Barbaro, A. Barbaro-Galtieri,V. Barnes, B. Barnett,M. Barone,G. Bauer,F. Bedeschi, S. Belforte, G. Bellettini, J. Bellinger,D. Benjamin,J. Bensinger, A. Beretvas,J. Berge, J. Berryhill,S. Bertolucci,B. Bevensee,A. Bhatti,C. Bigongiari,M. Binkley, D. Bisello,R. Blair,C. Blocker,K. Bloom, B. Blumenfeld,B. Blusk, A. Bocci,A. Bodek,W. Bokhari, G. Bolla,Y. Bonushkin,D. Bortoletto, J. Boudreau,A. Brandl,S. van den Brink,C. Bromberg,N. Bruner,E. Buckley-Geer, J. Budagov,H. Budd, K. Burkett,G. Busetto,A. Byon-Wagner,K. Byrum, M. Campbell,A. Caner,W. Carithers,J. Carlson, D. Carlsmith,J. Cassada, A. Castro, D. Cauz,A. Cerri,P. Chang,J. Chapman, C. Chen,Y. Chen,M.-T. Cheng, M. Chertok,G. Chiarelli,I. Chirikov-Zorin,G. Chlachidze, F. Chlebana,L. Christofek,M. Cobal, S. Cihangir, C. Ciobanu,A. Clark,M. Cobal,E. Cocca, A. Connolly, J. Conway,J. Cooper,M. Cordelli,D. Costanzo,J. Cranshaw, D. Cronin-Hennessy,R. Cropp, R. Culbertson,D. Dagenhart,F. DeJongh,S. Dell'Agnello,M. Dell'Orso,R. Demina, L. Demortier,M. Deninno,P. Derwent,T. Devlin, J. Dittmann,S. Donati,J. Done, T. Dorigo,N. Eddy, K. Einsweiler,J. Elias,E. Engels, W. Erdmann, D. Errede, S. Errede,Q. Fan,R. Feild, C. Ferretti,I. Fiori,B. Flaugher,G. Foster, M. Franklin, J. Freeman,J. Friedman,Y. Fukui, S. Gadomski,S. Galeotti, M. Gallinaro,T. Gao,M. Garcia-Sciveres, A. Garfinkel,P. Gatti, C. Gay,S. Geer, D. Gerdes,P. Giannetti,P. Giromini,V. Glagolev,M. Gold,J. Goldstein, A. Gordon,A. Goshaw, Y. Gotra, K. Goulianos, H. Grassmann,C. Green,L. Groer,C. Grosso-Pilcher,M. Guenther,G. Guillian,J. Guimaraes da Costa,R. Guo, C. Haber,E. Hafen,S. Hahn,C. Hall,T. Handa,R. Handler,W. Hao,F. Happacher, K. Hara,A. Hardman,R. Harris,F. Hartmann, K. Hatakeyama, J. Hauser,J. Heinrich,A. Heiss, B. Hinrichsen,K. Hoffman, C. Holck, R. Hollebeek,L. Holloway, R. Hughes,J. Huston, J. Huth,H. Ikeda,M. Incagli, J. Incandela,G. Introzzi,J. Iwai,Y. Iwata, E. James,H. Jensen,M. Jones, U. Joshi,H. Kambara, T. Kamon,T. Kaneko,K. Karr,H. Kasha,Y. Kato,T. Keaffaber,K. Kelley,M. Kelly,R. Kennedy,R. Kephart,D. Khazins,T. Kikuchi,M. Kirk, B. Kim,H. Kim, S. Kim,Y. Kim, L. Kirsch,S. Klimenko,D. Knoblauch,P. Koehn,A. Köngeter,K. Kondo, J. Konigsberg,K. Kordas, A. Korytov,E. Kovacs, J. Kroll, M. Kruse, S. Kuhlmann,K. Kurino,T. Kuwabara,A. Laasanen,N. Lai,S. Lami,S. Lammel,J. Lamoureux,M. Lancaster, G. Latino, T. LeCompte, A. Lee,S. Leone, J. Lewis,M. Lindgren, T. Liss, J. Liu, Y. Liu,N. Lockyer,M. Loreti,D. Lucchesi,P. Lukens,S. Lusin, J. Lys,R. Madrak, K. Maeshima, P. Maksimovic, L. Malferrari,M. Mangano,M. Mariotti,G. Martignon, A. Martin,J. Matthews, P. Mazzanti,K. McFarland,P. McIntyre,E. McKigney,M. Menguzzato, A. Menzione,E. Meschi, C. Mesropian,C. Miao, T. Miao,R. Miller,J. Miller,H. Minato,S. Miscetti,M. Mishina,N. Moggi,E. Moore,R. Moore,Y. Morita, A. Mukherjee,T. Muller,A. Munar,P. Murat,S. Murgia,M. Musy, J. Nachtman, S. Nahn,H. Nakada, T. Nakaya, I. Nakano, C. Nelson,D. Neuberger, C. Newman-Holmes,C.-Y. Ngan,P. Nicolaidi,H. Niu, L. Nodulman,A. Nomerotski,S. Oh,T. Ohmoto, T. Ohsugi,R. Oishi,T. Okusawa, J. Olsen,C. Pagliarone, F. Palmonari, R. Paoletti,V. Papadimitriou,S. Pappas,A. Parri,D. Partos,J. Patrick, G. Pauletta,M. Paulini,A. Perazzo,L. Pescara,T. Phillips,G. Piacentino,K. Pitts,R. Plunkett,A. Pompos,L. Pondrom,G. Pope,F. Prokoshin,J. Proudfoot,F. Ptohos,G. Punzi,K. Ragan,D. Reher,A. Ribon,F. Rimondi, L. Ristori,W. Robertson,A. Robinson, T. Rodrigo, S. Rolli,L. Rosenson,R. Roser, R. Rossin, W. Sakumoto, D. Saltzberg, A. Sansoni,L. Santi,H. Sato, P. Savard,P. Schlabach,E. Schmidt,M. Schmidt, M. Schmitt,L. Scodellaro,A. Scott, A. Scribano,S. Segler, S. Seidel, Y. Seiya,A. Semenov,F. Semeria, T. Shah, M. Shapiro,P. Shepard,T. Shibayama, M. Shimojima, M. Shochet, J. Siegrist,G. Signorelli,A. Sill,P. Sinervo, P. Singh,A. Slaughter,K. Sliwa,C. Smith,F. Snider,A. Solodsky, J. Spalding, T. Speer,P. Sphicas, F. Spinella, M. Spiropulu,L. Spiegel,L. Stanco, J. Steele,A. Stefanini, J. Strologas,F. Strumia, D. Stuart, K. Sumorok,T. Suzuki, R. Takashima,K. Takikawa,M. Tanaka,T. Takano, B. Tannenbaum,W. Taylor,M. Tecchio,P. Teng,K. Terashi,S. Tether,D. Theriot,R. Thurman-Keup,P. Tipton, S. Tkaczyk,K. Tollefson,A. Tollestrup,H. Toyoda, W. Trischuk,J. de Troconiz,S. Truitt,J. Tseng, N. Turini, F. Ukegawa,J. Valls,S. Vejcik,G. Velev,R. Vidal,R. Vilar,I. Vologouev,D. Vucinic,R. Wagner,J. Wahl,N. Wallace,A. Walsh, C. Wang,M. Wang,T. Watanabe,T. Watts,R. Webb,H. Wenzel,W. Wester,A. Wicklund, E. Wicklund,H. Williams,P. Wilson,B. Winer, D. Winn,S. Wolbers,D. Wolinski,J. Wolinski,S. Worm,X. Wu,J. Wyss,A. Yagil, W. Yao,G. Yeh,P. Yeh, J. Yoh,C. Yosef,T. Yoshida, I. Yu,S. Yu, A. Zanetti,F. Zetti,S. Zucchelli

PHYSICAL REVIEW D（2000）

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摘要

We use the transverse momentum spectrum of leptons in the decay chain t --> bW with W --> l nu to measure the helicity of the W bosons in the top quark rest frame. Ourmeasurement uses a tt sample isolated in 106 +/- 4 pb(-1) of data collected in collisions at root s = 1.8 TeV with the CDF detector at the Fermilab Tevatron. Assuming a standard. V-A weak decay, we find that the fraction of W's with zero helicity in the top rest frame is F-0 = 0.91 +/- 0.37(stat) +/- 0.13(syst), consistent with the standard model prediction of F-0 = 0.70 for a top mass of 175 GeV/c(2).

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关键词

standard model,polarization,particle decay,helicity,branching ratio,rest mass

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