Search for CP violation in the decay Z → τ+τ−

D. Buskulic,D. Casper,I. De Bonis,D. Decamp,P. Ghez,C. Goy,J.-P. Lees,M.-N. Minard,P. Odier,B. Pietrzyk,F. Ariztizabal,M. Chmeissani,J.M. Crespo,I. Efthymiopoulos,E. Fernandez,M. Fernandez-Bosman,V. Gaitan,Ll. Garrido,M. Martinez,S. Orteu,A. Pacheco,C. Padilla,F. Palla,A. Pascual,J.A. Perlas,F. Sanchez,F. Teubert,D. Creanza,M. de Palma,A. Farilla,G. Iaselli,G. Maggi,N. Marinelli,S. Natali,S. Nuzzo,A. Ranieri,G. Raso,F. Romano,F. Ruggieri,G. Selvaggi,L. Silvestris,P. Tempesta,G. Zito,X. Huang,J. Lin,Q. Ouyang,T. Wang,Y. Xie,R. Xu,S. Xue,J. Zhang, L. Zhang,W. Zhao,G. Bonvicini,P. Comas,P. Coyle,H. Drevermann,A. Engelhardt,R.W. Forty,M. Frank,G. Ganis,C. Gay,M. Girone,R. Hagelberg,J. Harvey,R. Jacobsen,B. Jost,J. Knobloch,I. Lehraus,M. Maggi,C. Markou,E.B. Martin,P. Mato,H. Meinhard,A. Minten,R. Miquel,P. Palazzi,J.R. Pater,P. Perrodo,J.-F. Pusztaszeri,F. Ranjard,L. Rolandi,D. Schlatter,M. Schmelling,W. Tejessy,I.R. Tomalin,R. Veenhof,A. Venturi,H. Wachsmuth,W. Wiedenmann,W. Witzeling,J. Wotschack,Z. Ajaltouni,M. Bardadin-Otwinowska,A. Barres,C. Boyer,A. Falvard,P. Gay,C. Guicheney,P. Henrard,J. Jousset,B. Michel,S. Monteil,J-C. Montret,D. Pallin,P. Perret,F. Podlyski,J. Proriol,J.-M. Rossignol,F. Saadi,T. Fearnley, J.B. Hansen,J.D. Hansen,J.R. Hansen,P.H. Hansen,S.D. Johnson,R. Møllerud,B.S. Nilsson,A. Kyriakis,E. Simopoulou,I. Siotis,A. Vayaki,K. Zachariadou,A. Blondel,G. Bonneaud,J.C. Brient,P. Bourdon,L. Passalacqua,A. Rougé,M. Rumpf,R. Tanaka,A. Valassi,M. Verderi,H. Videau,D.J. Candlin,M.I. Parsons,E. Veitch,E. Focardi,G. Parrini,M. Corden,M. Delfino,C. Georgiopoulos,D.E. Jaffe,A. Antonelli,G. Bencivenni,G. Bologna,F. Bossi,P. Campana,G. Capon,F. Cerutti,V. Chiarella,G. Felici,P. Laurelli,G. Mannocchi,F. Murtas,G.P. Murtas,M. Pepe-Altarelli,S. Salomone,P. Colrain,I. ten Have,I.G. Knowles,J.G. Lynch,W. Maitland,W.T. Morton,C. Raine,P. Reeves,J.M. Scarr,K. Smith,M.G. Smith,A.S. Thompson,S. Thorn,R.M. Turnbull,U. Becker,O. Braun,C. Geweniger,G. Graefe,P. Hanke,V. Hepp,E.E. Kluge,A. Putzer,B. Rensch,M. Schmidt,J. Sommer,H. Stenzel,K. Tittel,M. Wunsch,R. Beuselinck,D.M. Binnie,W. Cameron,M. Cattaneo,D.J. Colling,P.J. Dornan,J.F. Hassard,N. Konstantinidis,L. Moneta,A. Moutoussi,J. Nash,D.G. Payne,G. San Martin,J.K. Sedgbeer,A.G. Wright,G. Dissertori,P. Girtler,E. Kneringer,D. Kuhn,G. Rudolph,C.K. Bowdery,T.J. Brodbeck,A.J. Finch,F. Foster,G. Hughes,D. Jackson,N.R. Keemer,M. Nuttall,A. Patel,T. Sloan,S.W. Snow,E.P. Whelan,A. Galla,A.M. Greene,K. Kleinknecht,J. Raab,B. Renk,H.-G. Sander,H. Schmidt,S.M. Walther,R. Wanke,B. Wolf,A.M. Bencheikh,C. Benchouk,A. Bonissent,D. Calvet,J. Carr,C. Diaconu,F. Etienne,D. Nicod,P. Payre,L. Roos,D. Rousseau,M. Talby,I. Abt,S. Adlung,R. Assmann,C. Bauer,W. Blum,D. Brown,P. Cattaneo,B. Dehning,H. Dietl,F. Dydak,A.W. Halley,K. Jakobs,H. Kroha,J. Lauber,G. Lütjens,G. Lutz,W. Männer,H.-G. Moser,R. Richter,J. Schröder,A.S. Schwarz,R. Settles,H. Seywerd,U. Stierlin,U. Stiegler,R.St. Denis,G. Wolf,R. Alemany,J. Boucrot,O. Callot,A. Cordier,F. Courault,M. Davier,L. Duflot,J.-F. Grivaz,Ph. Heusse,M. Jacquet,P. Janot,D.W. Kim,F. Le Diberder,J. Lefrançois,A.-M. Lutz,G. Musolino,I. Nikolic,H.J. Park,I.C. Park,M.-H. Schune,S. Simion,J.-J. Veillet,I. Videau,D. Abbaneo,G. Bagliesi,G. Batignani,S. Bettarini,U. Bottigli,C. Bozzi,G. Calderini,M. Carpinelli,M.A. Ciocci,V. Ciulli,R. Dell'Orso,I. Ferrante,F. Fidecaro,L. Foà,F. Forti,A. Giassi,M.A. Giorgi,A. Gregorio,F. Ligabue,A. Lusiani,P.S. Marrocchesi,A. Messineo,G. Rizzo,G. Sanguinetti,A. Sciabà,P. Spagnolo,J. Steinberger,R. Tenchini,G. Tonelli,G. Triggiani,C. Vannini,P.G. Verdini,J. Walsh,A.P. Betteridge,G.A. Blair,L.M. Bryant, Y. Gao,M.G. Green,D.L. Johnson,T. Medcalf,Ll.M. Mir,J.A. Strong,V. Bertin,D.R. Botterill,R.W. Clifft,T.R. Edgecock,S. Haywood,M. Edwards,P. Maley,P.R. Norton,J.C. Thompson,B. Bloch-Devaux,P. Colas,H. Duarte,S. Emery,W. Kozanecki,E. Lançon,M.C. Lemaire,E. Locci,B. Marx,P. Perez,J. Rander,J.-F. Renardy,A. Rosowsky,A. Roussarie,J.-P. Schuller,J. Schwindling,D. Si Mohand,A. Trabelsi,B. Vallage,R.P. Johnson,A.M. Litke,G. Taylor,J. Wear,A. Beddall,C.N. Booth,C. Boswell,S. Cartwright,F. Combley,I. Dawson,A. Koksal,M. Letho,W.M. Newton,C. Rankin,L.F. Thompson,A. Böhrer,S. Brandt,G. Cowan,E. Feigl,C. Grupen,G. Lutters,J. Minguet-Rodriguez,F. Rivera,P. Saraiva,U. Schäfer,L. Smolik,L. Bosisio,R. Della Marina,G. Giannini,B. Gobbo,L. Pitis,F. Ragusa,H. Kim,J. Rothberg,S. Wasserbaech,S.R. Armstrong,L. Bellantoni,J.S. Conway,P. Elmer,Z. Feng,D.P.S. Ferguson,Y.S. Gao,S. Gonzáles,J. Grahl,J.L. Harton,O.J. Hayes,H. Hu,P.A. McNamara,J.M. Nachtman,W. Orejudos,Y.B. Pan,Y. Saadi,M. Schmitt,I. Scott,V. Sharma,J.D. Turk,A.M. Walsh,F.V. Weber,T. Wildish,Sau Lan Wu,X. Wu,J.M. Yamartino,M. Zheng,G. Zobernig

Physics Letters B（1995）

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摘要

Abstract Data collected by ALEPH in the years 1990, 1991 and 1992 have been used to update a previous search for CP violation in the decay of the Z into τ+τ−. The measurement of the weak dipole form factor of the τ lepton has been performed by studying correlations between the τ leptons. No signal of CP violation was found. The weak dipole form factor is found to be d τ = (+0.15 ± 0.58 stat ± 0.38 sys )10 −17 e · cm, obtained with 19628 identified τ+τ− events. This gives an upper limit on the weak dipole form factor of d τ −17 e · cm at the 95% confidence level.

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cp violation

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