Measurement Of The Tau-Polarization At The Z-Resonance

D Buskulic, D Decamp, C Goy,Jp Lees,Mn Minard, B Mours,B Pietrzyk,R Alemany,F Ariztizabal,P Comas,Jm Crespo,M Delfino, E Fenandez,M Fernandezbosman,V Gaitan, L Garrido,T Mattison,A Pacheco,C Padilla,A Pascual, D Creanza,M Depalma,A Farilla, G Iaselli, G Maggi,M Maggi,S Natali, S Nuzzo,M Quattromini, A Ranieri,G Raso, F Romano,F Ruggieri, G Selvaggi, L Silvestris,P Tempesta,G Zito, Y Chai,H Hu, D Huang,X Huang,J Lin, T Wang, Y Xie,D Xu,R Xu, J Zhang,W Zhao,Lat Bauerdick,E Blucher, G Bonvicini,J Boudreau, D Casper,H Drevermann,Rw Forty,G Ganis,C Gay,R Hagelberg,J Harvey,S Haywood, J Hilgart,R Jacobsen,B Jost, J Knobloch,I Lehraus, T Lohse,A Lusiani,M Martinez,P Mato,H Meinhard, A Minten,A Miotto, R Miquel,Hg Moser,P Palazzi,Ja Perlas,Jf Pusztaszeri, F Ranjard,G Redlinger,L Rolandi, J Rothberg,T Ruan,M Saich,D Schlatter, M Schmelling,F Sefkow, W Tejessy,H Wachsmuth,W Wiedenmann,T Wildish, W Witzeling,J Wotschack, Z Ajaltouni,F Badaud,M Bardadinotwinowska,R Elfellous, A Falvard, P Gay, C Guicheney, P Henrard, J Jousset,B Michel,Jc Montret, D Pallin, P Perret, F Podlyski,J Proriol,F Prulhiere, F Saadi, T Fearnley,Jd Hansen,Jr Hansen,Ph Hansen,R Mollerud,Bs Nilsson,Dj Candlin,Mi Parsons,E Veitch,L Moneta,G Parrini,M Corden, C Georgiopoulos,M Ikeda,J Lannutti, D Levinthal,M Mermikides,L Sawyer, S Wasserbaech,A Antonelli,R Baldini, G Bencivenni,G Bologna,F Bossi, P Campana,G Capon,F Cerutti,V Chiarella,B Dettorrepiazzoli,G Felici, P Laurelli,G Mannocchi,F Murtas,Gp Murtas,L Passalacqua,M Pepealtarelli,P Picchi,P Colrain,I Tenhave,Jg Lynch,W Maitland,Wt Morton,C Raine,P Reeves,Jm Scarr,K Smith,Mg Smith,As Thompson,Rm Turnbull,B Brandl,O Braun,C Geweniger, P Hanke,V Hepp,Ee Kluge,Y Maumary, A Putzer,B Rensch,A Stahl,K Tittel, M Wunsch,At Belk,R Beuselinck,Dm Binnie,W Cameron,M Cattaneo,Dj Colling,Pj Dornan,S Dugeay,Am Greene, Jf Hassaed,Nm Lieske, J Nash,Dg Payne,Mj Phillips,Jk Sedgbeer,Ir Tomalin,Ag Wright, P Girtler,E Kneringer, D Kuhn, G Rudolph,Ck Bowdery,Tj Brodbeck,Aj Finch, F Foster, G Hughes,D Jackson,Nr Keemer,M Nuttall,A Patel,T Sloan,Sw Snow,Ep Whelan,I Efthymiopoulos, A Kyriakis, E Simopoulou,A Vayaki,K Zachariadou,J Badier, A Blondel,G Bonneaud,Jc Brient,G Fouque, S Orteu,A Rouge,M Rumpf, R Tanaka, M Verderi,H Videau,S Adlung,R Assmann,C Bauer, W Blum,D Brown,P Cattaneo,B Dehning,H Dietl,F Dydak, M Frank,Aw Halley,J Lauber, G Lutjens, G Lutz, W Manner,R Richter, H Rotscheidt, J Schroder,As Schwarz,R Settles,H Seywerd, U Stierlin,U Stiegler,R Stdenis, G Wolf, J Boucrot,O Callot,A Cordier, M Davier, L Duflot,Jf Grivaz,P Heusse,De Jaffe,P Janot,Dw Kim,F Lediberder, J Lefrancois,Am Lutz,Mh Schune,Jj Veillet,I Videau,Z Zhang, D Abbaneo, G Bagliesi,G Batignani, L Bosisio,U Bottigli, C Bozzi, G Calderini, M Carpinelli,Ma Ciocci,R Dellorso,I Ferrante, F Fidecaro,L Foa,E Focardi,F Forti, A Giassi,Ma Giorgi,A Gregorio, F Ligabue,Eb Mannelli,Ps Marrocchesi, A Messineo,F Palla, G Rizzo,G Sanguinetti,P Spagnolo,J Steinberger, R Tenchini,G Tonelli,G Triggiani,C Vannini, A Venturi,Pg Verdini, J Walsh,Ap Betteridge,Jm Carter,Mg Green,Pv March, Lm Mir, T Medcalf,Is Quazi,Ja Strong, Lr West,Dr Botterill,Rw Clifft,Tr Edgecock,M Edwards,Sm Fisher,Tj Jones,Pr Norton,Dp Salmon,Jc Thompson, K Kleinknecht,J Raab,B Renk,Hg Sander,H Schmidt, F Steeg,Sm Walther,R Wanke,B Wolf,Jj Aubert,Am Bencheikh, C Benchouk,A Bonissent,J Carr,P Coyle,J Drinkard,F Etienne,D Nicod,S Papalexiou,P Payre,L Roos, D Rousseau, P Schwemling,M Talby,B Blochdevaux,P Colas,H Duarte, W Kozanecki,E Lancon,Mc Lemaire, E Locci, P Perez,F Perrier, J Rander,Jf Renardy, A Rosowsky, A Roussarie,Jp Schuller,J Schwindling,Ds Mohand,B Vallage,Rp Johnson,Am Litke,G Taylor, J Wear,Jg Ashman,W Babbage,Cn Booth,C Buttar,Re Carney,S Cartwright, F Combley,F Hatfield,Lf Thompson, E Barberio,A Bohrer,S Brandt, G Cowan,C Grupen,G Lutters,F Rivera,U Schafer,R Dellamarina,G Giannini,B Gobbo, F Ragusa, L Bellantoni,W Chen,D Cinabro,Js Conway,Df Cowen,Z Feng,Dps Ferguson,Ys Gao, J Grahl,Jl Harton,Rc Jared,Bw Leclaire,C Lishka,Yb Pan,Jr Pater,Y Saadi, M Schmitt,V Sharma,Zh Shi,Am Walsh,Fv Weber,Sl Wu,X Wu,M Zheng, G Zobernig

ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS（1993）

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摘要

Using 18.8 pb-1 of data collected in 1990 and 1991, ALEPH has measured the tau polarisation in the decay modes tau-->enunuBAR, tau-->mununuBAR, tau-->rhonu tau-->a1nu, using both the individual tau decay kinematics and the event acollinearity. The measurement of the tau polarisation as a function of the production polar angle yields the two parameters A(tau) and A(e), where A(l) = 2g(V)l g(A)l/[(g(V)l)2 + (g(A)l)2]. The results A(tau) = 0.143 +/- 0.023 and A(e) = 0. 120 +/- 0.026 are consistent with the hypothesis of electron-tau universality. Assuming universality yields a measurement of the effective weak mixing angle sin 2theta(W)eff = 0.2332 +/- 0.0022.

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