Measurement of polarisation at LEP

M. Acciarri,O. Adriani,M. Aguilar-Benitez,S. Ahlen,J. Alcaraz,G. Alemanni,J. Allaby,A. Aloisio,M. G. Alviggi,G. Ambrosi,H. Anderhub,V. P. Andreev,T. Angelescu,F. Anselmo,A. Arefiev,T. Azemoon,T. Aziz,P. Bagnaia,L. Baksay,R. C. Ball,S. Banerjee,K. Banicz,A. Barczyk,R. Barillère,L. Barone,P. Bartalini,A. Baschirotto,M. Basile,R. Battiston,A. Bay,F. Becattini,U. Becker,F. Behner,J. Berdugo,P. Berges,B. Bertucci,B. L. Betev,S. Bhattacharya,M. Biasini,A. Biland,G. M. Bilei,J. J. Blaising,S. C. Blyth,G. J. Bobbink,R. Bock,A. Böhm,L. Boldizsar,B. Borgia,D. Bourilkov,M. Bourquin,D. Boutigny,S. Braccini,J. G. Branson,V. Brigljevic,I. C. Brock,A. Buffini,A. Buijs,J. D. Burger, W. J. Burger,J. Busenitz,X. D. Cai,M. Campanelli,M. Capell,G. Cara Romeo,G. Carlino,A. M. Cartacci,J. Casaus,G. Castellini,F. Cavallari,N. Cavallo,C. Cecchi,M. Cerrada,F. Cesaroni,M. Chamizo,Y. H. Chang,U. K. Chaturvedi,S. V. Chekanov,M. Chemarin,A. Chen,G. Chen, G. M. Chen,H. F. Chen, H. S. Chen,M. Chen,G. Chiefari,C. Y. Chien,L. Cifarelli,F. Cindolo,C. Civinini,I. Clare,R. Clare,H. O. Cohn,G. Coignet,A. P. Colijn,N. Colino,S. Costantini,F. Cotorobai,B. de la Cruz,A. Csilling,T. S. Dai,R. D'Alessandro,R. de Asmundis,A. Degré,K. Deiters,P. Denes,F. DeNotaristefani,D. DiBitonto,M. Diemoz,D. van Dierendonck,F. di Lodovico,C. Dionisi,M. Dittmar,A. Dominguez,A. Doria,M. T. Dova,E. Drago,D. Duchesneau,P. Duinker,I. Duran,S. Dutta,S. Easo,Y. Efremenko,H. El Mamouni,A. Engler,F. J. Eppling,F. C. Erne,J. P. Ernenwein,P. Extermann,M. Fabre,R. Faccini,S. Falciano,A. Favara,J. Fay,O. Fedin,M. Felcini,B. Fenyi,T. Ferguson,F. Ferroni,H. Fesefeldt,E. Fiandrini,J. H. Field,F. Filthaut,P. H. Fisher,I. Fisk,G. Forconi,L. Fredj,K. Freudenreich,C. Furetta,Y. Galaktionov,S. N. Ganguli,P. Garcia-Abia,S. S. Gau,S. Gentile,J. Gerald,N. Gheordanescu,S. Giagu,S. Goldfarb,J. Goldstein,Z. F. Gong,A. Gougas,G. Gratta,M. W. Gruenewald,V. K. Gupta,A. Gurtu,L. J. Gutay,D. Haas,B. Hartmann,A. Hasan,D. Hatzifotiadou,T. Hebbeker,A. Hervé,J. Hirschfelder,W. C. van Hoek,H. Hofer,H. Hoorani,S. R. Hou,G. Hu,V. Innocente,K. Jenkes,B. N. Jin,L. W. Jones,P. de Jong,I. Josa-Mutuberria,A. Kasser,R. A. Khan,D. Kamrad,Y. Kamyshkov,J. S. Kapustinsky,Y. Karyotakis,M. Kaur,M. N. Kienzle-Focacci,D. Kim,D. H. Kim,J. K. Kim,S. C. Kim,W. W. Kinnison,A. Kirkby,D. Kirkby,J. Kirkby,D. Kiss,W. Kittel,A. Klimentov,A. C. Konig,A. Kopp,I. Korolko,V. Koutsenko,R. W. Kraemer,W. Krenz,A. Kunin,P. Lacentre,P. Ladron de Guevara,G. Landi,C. Lapoint,K. Lassila-Perini,P. Laurikainen,A. Lavorato,M. Lebeau,A. Lebedev,P. Lebrun,P. Lecomte,P. Lecoq,P. Le Coultre,H. J. Lee,C. Leggett,J. M. Le Goff,R. Leiste,E. Leonardi,P. Levtchenko,C. Li,C. H. Lin,W. T. Lin,F. L. Linde,L. Lista,Z. A. Liu,W. Lohmann,E. Longo,W. Lu,Y. S. Lu,K. Lubelsmeyer,C. Luci,D. Luckey,L. Luminari,W. Lustermann,W. G. Ma,M. Maity,G. Majumder,L. Malgeri,A. Malinin,C. Maña,D. Mangeol,S. Mangla,P. Marchesini,A. Marin,J. P. Martin,F. Marzano,G. G.G. Massaro,D. McNally,S. Mele,L. Merola,M. Meschini,W. J. Metzger,M. von der Mey,Y. Mi,D. Migani,A. Mihul,A. J.W. van Mil,H. Milcent,G. Mirabelli,J. Mnich,P. Molnar,B. Monteleoni,R. Moore,T. Moulik,R. Mount,F. Muheim,A. J.M. Muijs,S. Nahn,M. Napolitano,F. Nessi-Tedaldi,H. Newman,T. Niessen,A. Nippe,A. Nisati,H. Nowak,Y. D. Oh,H. Opitz,G. Organtini,R. Ostonen,S. Palit,C. Palomares,D. Pandoulas,S. Paoletti,P. Paolucci,H. K. Park, I. H. Park,G. Pascale,G. Passaleva,S. Patricelli,T. Paul,M. Pauluzzi,C. Paus,F. Pauss,D. Peach,Y. J. Pei,S. Pensotti,D. Perret-Gallix,B. Petersen,S. Petrak,A. Pevsner,D. Piccolo,M. Pieri,P. A. Piroué,E. Pistolesi,V. Plyaskin,M. Pohl,V. Pojidaev,H. Postema,N. Produit,D. Prokofiev,J. Quartieri,G. Rahal-Callot,N. Raja,P. G. Rancoita,M. Rattaggi,G. Raven,P. Razis,K. Read,D. Ren,M. Rescigno,S. Reucroft,T. van Rhee,S. Riemann,K. Riles,O. Rind,A. Robohm,J. Rodin,B. P. Roe,L. Romero,S. Rosier-Lees,P. Rosselet,W. van Rossum,S. Roth,J. A. Rubio,D. Ruschmeier,H. Rykaczewski,J. Salicio,E. Sanchez,M. P. Sanders,M. E. Sarakinos, S. Sarkar,G. Sauvage,C. Schäfer,V. Schegelsky,S. Schmidt-Kaerst,D. Schmitz,M. Schneegans,N. Scholz,H. Schopper,D. J. Schotanus,J. Schwenke,G. Schwering,C. Sciacca,D. Sciarrino,L. Servoli,S. Shevchenko,N. Shivarov,V. Shoutko,J. Shukla,E. Shumilov,A. Shvorob,T. Siedenburg,D. Son,V. Soulimov,B. Smith,P. Spillantini,M. Steuer,D. P. Stickland,H. Stone,B. Stoyanov,A. Straessner,K. Sudhakar,G. Sultanov,L. Z. Sun,G. F. Susinno,H. Suter,J. D. Swain,X. W. Tang,L. Tauscher,L. Taylor,S. C.C. Ting,S. M. Ting,S. C. Tonwar,J. Tóth,Christopher George Tully,H. Tuchscherer,K. L. Tung,Y. Uchida,J. Ulbricht,U. Uwer,E. Valente,G. Vesztergombi,I. Vetlitsky,G. Viertel,M. Vivargent,S. Vlachos,R. Völkert,H. Vogel,H. Vogt,I. Vorobiev,A. A. Vorobyov,A. Vorvolakos,M. Wadhwa,W. Wallraff,J. C. Wang,X. L. Wang,Z. M. Wang,A. Weber,S. X. Wu,S. Wynhoff,J. Xu,Z. Z. Xu,B. Z. Yang,C. G. Yang,X. Y. Yao,J. B. Ye,S. C. Yeh,J. M. You,A. Zalite,Y. Zalite,P. Zemp,Y. Zeng,Z. Zhang,Z. P. Zhang,B. Zhou,Y. Zhou,G. Y. Zhu,R. Y. Zhu,A. Zichichi,F. Ziegler

PHYSICS LETTERS B（2003）

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摘要

Using the data collected with the L3 detector at LEP between 1990 and 1995, corresponding to an integrated luminosity of 149 pb(-1), the tau longitudinal polarisation has been measured as a function of the production polar angle using the tau decays tau(-) --> h(-)nu(tau) (h = pi,rho,a(1)) and tau(-)-->l(-)<(nu)over bar>(l)nu(tau) (l = e,mu). From this measurement the quantities A(c) and A(tau), which depend on the couplings of the electron and the tau to the Z, are determined to be A(c) = 0.1678 +/- 0.0127 +/- 0.0030 and A(tau) = 0.1476 +/- 0.0088 +/- 0.0062, consistent with the hypothesis of e-tau universality, Under this assumption a value of A(l) = 0.1540 +/- 0.0074 +/- 0.0044 is obtained, yielding the value of the effective weak mixing angle sin(2)<(theta)over bar>(W) = 0.2306 +/- 0.0011. (C) 1998 Elsevier Science B.V. All rights reserved.

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关键词

detector,pair production,generator,exponentiation

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