Measurement of the branching ratio and an upper limit on

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 Fernandezbosman,V Gaitan,L Garrido,M Martinez,S Orteu,A Pacheco,C Padilla,F Palla,A Pascual,J A Perlas,Francisca Javiela Munoz 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, Jian Lin, Qi Ouyang,Tao Wang, Y Xie,R Xu,S Xue,Jun Zhang, Liwei Zhang,Wenyuan Zhao,G Bonvicini, J Boudreau,P Comas,P V Coyle, H Drevermann,A Engelhardt,R Forty,M Frank,G Ganis,C Gay,M Girone,R Hagelberg,J Harvey,R G 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 Bardadinotwinowska,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 R Hansen,P H Hansen,Scott Johnson,R Mollerud,B S Nilsson, A Kyriakis,E Simopoulou,I Siotis,A Vayaki,K Zachariadou, A Blondel,G R Bonneaud,J C Brient,P Bourdon,L Passalacqua, A Rouge,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,Francesco Cerutti,V Chiarella,G Felici,P Laurelli,G Mannocchi,F Murtas, G P Murtas,M Pepealtarelli,Salvatore Salomone,P Colrain,I Ten Have,I G Knowles,J G Lynch,W Maitland,W T Morton,C Raine,Peter R Reeves,J M Scarr, K M Smith, M G Smith,A S Thompson,S Thorn,R M Turnbull,U Becker,O Braun, C Geweniger, P Hanke,V Hepp, E E Kluge,A Putzer,B Rensch,M P Schmidt, H Stenzel,K Tittel,M Wunsch,R Beuselinck, D M Binnie,W Cameron,M Cattaneo,David 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,Gunther Dissertori,P Girtler, E Kneringer, D Kuhn, G Rudolph,C K Bowdery,T J Brodbeck,A J Finch,F Foster, G Hughes, D A 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 R Schmidt,S M Walther,R Wanke,Bryan A 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,Werner F Blum,D N Brown,P W Cattaneo,B Dehning,H Dietl, F Dydak,A W Halley, K Jakobs, H Kroha,J Lauber, G Lutjens, G Lutz,W Manner, H G Moser,R Richter, J Schroder,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, P Heusse,M Jacquet, P Janot, D W Kim,F Le Diberder, J Lefrancois,A M Lutz,G Musolino,I Nikolic,Hae Jeong 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 Dellorso,I Ferrante,F Fidecaro, L Foa,F Forti, A Giassi,M A Giorgi,A Gregorio,F Ligabue,A Lusiani,P S Marrocchesi, A Messineo,G Rizzo,G Sanguinetti,A Sciaba,P Spagnolo,J Steinberger, R Tenchini,G Tonelli,G Triggiani,C Vannini, P G Verdini, J B Walsh,A P Betteridge,M G Green, D L Johnson,T Medcalf,Ll M Mir,I S Quazi,J A Strong,V Bertin,D Botterill, R W Clifft,T R Edgecock, S J Haywood,M J Edwards,P Maley,P R Norton,J C Thompson,B Blochdevaux,P Colas,H Duarte,S Emery,W Kozanecki,E Lancon, 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 P Taylor,J Wear, A J 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 Bohrer,Scott A Brandt,G Cowan, E Feigl, C Grupen,G Lutters,J Minguetrodriguez,F Rivera,P Saraiva,U Schafer,L Smolik,L Bosisio,R Della Marina,G Giannini,B Gobbo,L Pitis,F Ragusa,H Kim, J Rothberg, S Wasserbaech, L Bellantoni,J Conway,Z Feng, D Ferguson,Y S Gao,J Grahl,J L Harton,O J Hayes, H Hu,J Nachtman, Y B Pan,Y Saadi, M Schmitt,I J Scott,Varun 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 Using 1.45 million hadronic Z decays collected by the ALEPH experiment at LEP, the b → τ − ν - τ X branching ratio is measured to be 2.75 ± 0.30 ± 0.37%. In addition an upper limit of 1.8 × 10 −3 at 90% confidence level is placed upon the exclusive branching ratio of B − → τ − ν - τ . These measurements are consistent with SM expectations, and put the constraint tan β M h ± GeV −1 at 90% confidence level on all Type II two Higgs doublet models (such as the MSSM).

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