Evidence of the Purely Leptonic DecayB−→τ−ν¯τ

K Ikado,M Akemoto,A Imoto,S Mconie,U Bitenc,I Bizjak,T Nagamine,D Liventsev,A Kuzmin,P Krokovny,G Leder,Y Iwasaki,T Aushev,G Gokhroo,S Villa,D Epifanov,H Stoeck,M Yamauchi,S Uno,Y Miyazaki,R Pestotnik,E Nakano,O Nitoh,N C Hastings,K Hayasaka,M Starič,S U Kataoka,I Bedny,J S Lange,Z P Zhang,R Itoh,K Inami,T Schietinger,T Tsuboyama,Y Yamashita,T Okabe,T Lesiak,I Nakamura,Y Hoshi,P Pakhlov,S Nishida,T E Browder,H Kawai,T Kawasaki,A Go,T Tsukamoto,X C Tian,T Ohshima,N Katayama,K Ohmi,I Adachi,N Gabyshev,H Ozaki,T Hokuue,D Zürcher,E Won,K Kinoshita,B Golob,J Haba,A Ishikawa,A Chen,S Noguchi,H Hayashii,Y Onuki,P Križan,H Ha,A Matyja,S Okuno,L E Piilonen,Y Watanabe,A Somov,R Kulasiri,M Shapkin,L Hinz,T Sumiyoshi,Y Teramoto,S Ogawa,K Akai,H Park,C Schwanda,G N Taylor,T Hara,A Yamaguchi,S Korpar,Y Sakai,Y Usov,T Nozaki,P Chang,K Tamai,S Fratina,H Shibuya,K Trabelsi,J Dalseno,K Miyabayashi,K Ueno,S L Olsen,M Bračko,T Iijima,K Senyo,M E Sevior,S Eidelman,A M Bakich,B Shwartz,Y Yusa,W Ostrowicz,Y Choi,D Anipko,J H Kang,C H Wang,K Sumisawa,H Kichimi,M Nakao,T Uglov,K Belous,F Takasaki,M Dash,H Miyata,K Arinstein,A Bay,S Cole,R Mizuk,S Uehara,O Schneider,M Danilov,M Iwasaki,T Matsumoto,Shinichiro Michizono ,M Hazumi,Yoshinori Ogawa ,J Lee,R Kumar,V Balagura,A Gorišek,K Hara,M Barbero,Kazuo Abe ,T Gershon,N Iida,W.-S Hou,L M Zhang,Y Unno,A Limosani,A Poluektov,S Stanič,T Mimashi,G Varner,O Tajima,T Aziz,J Flanagan,A Bożek ,A Sokolov,C W Park,K Furukawa,C C Wang,H J Kim,W T Chen,K Oide,T Shidara,H O Kim,D Marlow,S W Lin ,C C Kuo,S Suzuki,T Kamitani,V Zhilich,T Nakamura ,N Tamura,S Hou,E Kikutani,W Mitaroff,N Ohuchi,Masato Yoshida ,M Tanaka,V Sidorov,H Koiso,M Tawada,Y J Kwon ,H Aihara,A Bondar,V Aulchenko,M Różańska ,B Yabsley ,H Ishino

doi:10.1103/physrevlett.97.251802

Evidence of the Purely Leptonic DecayB−→τ−ν¯τ

K Ikado, M Akemoto + Show 181 more

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https://doi.org/10.1103/physrevlett.97.251802

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Journal: Physical Review Letters	Publication Date: Dec 22, 2006
Citations: 212

Affiliation: Nagoya University, Nara Women's University, University of Sydney, Tohoku University, Budker Institute of Nuclear Physics, Austrian Academy of Sciences, Tata Institute of Fundamental Research, École Polytechnique Fédérale de Lausanne, Osaka City University, Tokyo University of Agriculture and Technology, University of Tokyo, Goethe University Frankfurt, University of Science and Technology of China, Polish Academy of Sciences, Tohoku Gakuin University, Chiba University, Niigata University, National Central University, Peking University, Korea University, University of Cincinnati, University of Ljubljana, Kanagawa University, Virginia Tech, Tokyo Institute of Technology, Tokyo Metropolitan University, Toho University, Kyungpook National University, University of Melbourne, Osaka University, University of Maribor, National Taiwan University, Sungkyunkwan University, Yonsei University

#Hadronic Modes #Belle Detector + Show 4 more

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Abstract

We present the first evidence of the decay B- --> tau- nu_tau-bar using 414 fb^-1 of data collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. Events are tagged by fully reconstructing one of the B mesons in hadronic modes. We detect the signal with a significance of 3.5 standard deviations including systematics, and measure the branching fraction to be Br(B- --> tau- nu_tau-bar) = (1.79 +0.56-0.49(stat) +0.46-0.51(syst))*10^-4. This implies that f_B = 0.229 +0.036-0.031(stat) +0.034-0.037(syst) GeV and is the first direct measurement of this quantity.

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