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）
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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