Measurement of the Τ-Lepton Lifetime at Belle

K. Belous,M. Shapkin,A. Sokolov,I. Adachi,H. Aihara,D. M. Asner,V. Aulchenko,A. M. Bakich,A. Bala,B. Bhuyan,A. Bobrov,A. Bondar,G. Bonvicini,A. Bozek,M. Bracko,T. E. Browder,D. Cervenkov,V. Chekelian,A. Chen,B. G. Cheon,K. Chilikin,R. Chistov,K. Cho,V. Chobanova,Y. Choi,D. Cinabro,J. Dalseno,Z. Dolezal,D. Dutta,S. Eidelman,D. Epifanov,H. Farhat,J. E. Fast,T. Ferber,V. Gaur,S. Ganguly,A. Garmash,R. Gillard,Y. M. Goh,B. Golob,J. Haba,T. Hara, K. Hayasaka,H. Hayashii,Y. Hoshi,W. -S. Hou,T. Iijima,K. Inami,A. Ishikawa,R. Itoh,T. Iwashita,I. Jaegle,T. Julius,E. Kato,H. Kichimi, C. Kiesling,D. Y. Kim,H. J. Kim, J. B. Kim,M. J. Kim,Y. J. Kim,K. Kinoshita,B. R. Ko, P. Kodys,S. Korpar, P. Krizan,P. Krokovny, T. Kuhr,A. Kuzmin,Y. -J. Kwon, J. S. Lange, S. -H. Lee,J. Libby,D. Liventsev,P. Lukin,D. Matvienko,H. Miyata,R. Mizuk,G. B. Mohanty,T. Mori,R. Mussa,Y. Nagasaka,E. Nakano,M. Nakao,M. Nayak,E. Nedelkovska,C. Ng,N. K. Nisar,S. Nishida,O. Nitoh,S. Ogawa,S. Okuno,S. L. Olsen,W. Ostrowicz,G. Pakhlova,C. W. Park,H. Park,H. K. Park,T. K. Pedlar,R. Pestotnik,M. Petric,L. E. Piilonen,M. Ritter, M. Roehrken,A. Rostomyan,S. Ryu,H. Sahoo,T. Saito,Y. Sakai,S. Sandilya,D. Santel,L. Santelj,T. Sanuki,V. Savinov,O. Schneider,G. Schnell,C. Schwanda,D. Semmler,K. Senyo,O. Seon,V. Shebalin,C. P. Shen,T. -A. Shibata,J. -G. Shiu,B. Shwartz,A. Sibidanov,F. Simon,Y-S. Sohn,S. Stanic,M. Staric,M. Steder,T. Sumiyoshi,U. Tamponi,G. Tatishvili,Y. Teramoto,K. Trabelsi,T. Tsuboyama,M. Uchida,S. Uehara,T. Uglov,Y. Unno,S. Uno,Y. Usov,S. E. Vahsen,C. Van Hulse,P. Vanhoefer,G. Varner,K. E. Varvell,A. Vinokurova,V. Vorobyev, M. N. Wagner,C. H. Wang,P. Wang,M. Watanabe,Y. Watanabe,K. M. Williams,E. Won,J. Yamaoka,Y. Yamashita,S. Yashchenko,Y. Yook,C. Z. Yuan,Z. P. Zhang,V. Zhilich,A. Zupanc

Physical review letters（2014）

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摘要

The lifetime of the τ lepton is measured using the process e+ e- → τ+ τ- , where both τ leptons decay to 3πν(τ). The result for the mean lifetime, based on 711 fb(-1) of data collected with the Belle detector at the ϒ(4S) resonance and 60 MeV below, is τ=(290.17±0.53(stat)±0.33(syst))×10(-15) s. The first measurement of the lifetime difference between τ+ and τ- is performed. The upper limit on the relative lifetime difference between positive and negative τ leptons is |Δτ|/τ<7.0×10(-3) at 90% C.L.

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