Measurement of → Τ and a New Limit for → Τ
M Acciarri,O Adriani,M Aguilar-Benitez,S Ahlen,B Alpat,J Alcaraz,G Alemanni,J Allaby,A Aloisio,G Alverson,M.G Alviggi,G Ambrosi,H Anderhub,V.P Andreev,T Angelescu,F Anselmo,D Antreasyan,A Arefiev,T Azemoon,T Aziz,P Bagnaia,L Baksay,R.C Ball,S Banerjee,K Banicz,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,B Borgia,A Boucham,D Bourilkov,M Bourquin,D Boutigny,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,M Caria,G Carlino,A.M Cartacci,J Casaus,G Castellini,F Cavallari,N Cavallo,C Cecchi,M Cerrada,F Cesaroni,M Chamizo,A Chan,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,M.T Choi,L Cifarelli,F Cindolo,C Civinini,I Clare,R Clare,H.O Cohn,G Coignet,A.P Colijn,N Colino,V Commichau,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,I Dorne, M.T Dova,E Drago,D Duchesneau,P Duinker, I Duran,S Dutta,S Easo,Yu Efremenko,H El Mamouni, A Engler,F.J Eppling, F.C Erné,J.P Ernenwein,P Extermann,M Fabre,R Faccini,S Falciano,A Favara,J Fay,O Fedin,M Felcini,B Fenyi,T Ferguson,D Fernandez,F Ferroni,H Fesefeldt,E Fiandrini,J.H Field,F Filthaut,P.H Fisher,G Forconi,L Fredj,K Freudenreich,C Furetta,Yu Galaktionov,S.N Ganguli,P Garcia-Abia,S.S Gau, S Gentile,J Gerald,N Gheordanescu,S Giagu,S Goldfarb, J Godlstein, Z.F Gong,A Gougas,G Gratta, M.W Gruenewald,V.K Gupta,A Gurtu,L.J Gutay,B Hartmann,A Hasan,D Hatzifotiadou, T Hebbeker,A Hervé,W.C van Hoek,H Hofer,H Hoorani,S.R Hou,G Hu,V Innocente,H Janssen,K Jenkes,B.N Jin, L.W Jones,P de Jong,I Josa-Mutuberria,A Kasser, R.A Khan,D Kamrad,Yu Kamyshkov,J.S Kapustinsky,Y Karyotakis,M Kaur,M.N Kienzle-Focacci,D Kim,J.K Kim,S.C Kim,Y.G Kim,W.W Kinnison,A Kirkby,D Kirkby,J Kirkby,D Kiss,W Kittel,A Klimentov,A.C König,I Korolko, V Koutsenko,R.W Kraemer,W Krenz,A Kunin,P Ladron de Guevara,G Landi,C Lapoint,K Lassila-Perini,P Laurikainen,M Lebeau,A Lebedev,P Lebrun,P Lecomte,P Lecoq,P Le Coultre, J.S Lee,K.Y Lee,C Leggett,J.M Le Goff,R Leiste,E Leonardi,P Levtchenko,C Li,E Lieb,W.T Lin,F.L Linde,L Lista, Z.A Liu, W Lohmann,E Longo,W Lu,Y.S Lu, K Lübelsmeyer,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,A Mihul,A.J.W van Mil, G Mirabelli,J Mnich,P Molnar,B Monteleoni,R Moore,S Morganti,T Moulik,R Mount,S Müller,F Muheim,A.J.M Muijs,E Nagy,S Nahn, M Napolitano,F Nessi-Tedaldi,H Newman,T Niessen,A Nippe, A Nisati,H Nowak,H Opitz,G Organtini,R Ostonen,P Pakhlov,D Pandoulas,S Paoletti,P Paolucci,H.K 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,J.C Pinto,P.A Piroué,E Pistolesi,V Plyaskin,M Pohl,V Pojidaev,H Postema,N Produit,D Prokofiev,G Rahal-Callot,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,S Ro,A Robohm,J Rodin,F.J Rodriguez,B.P Roe,L Romero,S Rosier-Lees,Ph Rosselet,W van Rossum,S Roth,J.A Rubio,H Rykaczewski,J Salicio, E Sanchez,M.P Sanders, A Santocchina,M.E Sarakinos, S Sarkar,M Sassowsky,G Sauvage,C Schäfer,V Schegelsky,S Schmidt-Kaerst,D Schmitz,P Schmitz, M Schneegans,N Scholz,H Schopper,D.J Schotanus, J Schwenke,G Schwering, C Sciacca,D Sciarrino,J.C Sens,L Servoli,S Shevchenko,N Shivarov,V Shoutko,J Shukla,E Shumilov,A Shvorob,T Siedenburg,D Son,A Sopczak, V Soulimov,B Smith,P Spillantini,M Steuer,D.P Stickland,H Stone,B Stoyanov,A Straessner,K Strauch,K Sudhakar,G Sultanov,L.Z Sun,G.F Susinno, H Suter,J.D Swain,X.W Tang,L Tauscher,L Taylor,Samuel C.C Ting,S.M Ting,M Tonutti,S.C Tonwar,J Tóth,C Tully,H Tuchscherer,K.L Tung,Y Uchida,J Ulbricht,U Uwer,E Valente,R.T Van de Walle,G Vesztergombi, I Vetlitsky,G Viertel,M Vivargent,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,F Wittgenstein,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,An Zalite,Yu 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（1997）
引用 20|浏览159
摘要
Using a data sample of 1 475 000 Z → qq̄(γ) events collected during 1994 with the L3 detector at LEP, we have studied the purely leptonic decays of heavy flavour mesons, Ds− → τ−ντ and B− → τ−ντ. A signal is observed in the invariant mass distribution M(γDs−) corresponding to the decay sequence D∗− → γDs−, Ds− → τ−ντ, τ− → l−νlντ. The branching fraction for Ds− → τ−ντ decays is measured to be β(Ds− → τ−ντ) = 0.074 ± 0.028(stat) ± 0.016(syst) ± 0.018(norm). No signal of B− → τ−ντ decays is observed in the data, corresponding to an upper limit on the branching franction β(B− → τ−ντ) < 5.7 × 10−4 at 90% CL.
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