Measurement of the branching fraction ofB+→τ+ντdecays with the semileptonic tagging method

B Kronenbitter,V Gaur,D Epifanov,M Steder,Y Sakai,T Aushev,M Petrič,S Okuno,D Getzkow,V Chobanova,D Červenkov,Y Sato,P Kodyš,C Schwanda,P Lukin,H Miyata,L Pesántez,S Uehara,M Starič,W Ostrowicz,M Heck,D Liventsev,U Tamponi,Y Choi,P Križan,R Mussa,Y.-J Kwon,R Glattauer,M Watanabe,M Ziegler,R Itoh,C Van Hulse,O Schneider,A Ishikawa,R Ayad,T Sanuki,P Wang,E Barberio,A Abdesselam,M Ritter,Y Teramoto,K Cho,M Uchida,M Huschle,A Vossen,S Stanič,H Hayashii,G Schnell,R Pestotnik,F Simon,T Aziz,A Rostomyan,S Ryu,M Danilov,E Kato,T Horiguchi,P Pakhlov,T Julius,M Bračko,V Bansal,C Pulvermacher,V Savinov,Z Doležal,R Gillard,R Chistov,J Dalseno,A Garmash,M Nakao,K Inami,A Bondar,T Ferber,H Farhat,T Sumiyoshi,E Solovieva,V Zhulanov,K Arinstein,V Bhardwaj,A Vinokurova,S Nishida,T Iijima,D Dutta,H Aihara,V Zhilich,J Dingfelder,K Chilikin,E Won,M Nayak,O Frost,A Zupanc,Y Watanabe,K Kinoshita,J Libby,P Vanhoefer,K Senyo,B Shwartz,I Adachi,L Li Gioi,P Urquijo,K Hayasaka,H Yamamoto,C Oswald,T Uglov,R Mizuk,D Matvienko,Z Natkaniec,A Sibidanov,Y Yook,M Schram,P Lewis,Y Unno,N Gabyshev,S Mohanty,G Pakhlova,T Nanut,D Cinabro,A Drutskoy,V Shebalin,M Heider,Z Drásal,E Ribežl,A Moll,S Yashchenko,G Bonvicini,P Goldenzweig,V Chekelian,Y Usov,J Grygier,A Chen,S Uno,G Varner,O Seon,K Trabelsi,A Sokolov,E Nakano,A Kuzmin,S Eidelman,T Kuhr,B Golob,S Al Said,P Krokovny,K H Kang ,I S Lee ,K K Joo ,N K Nisar ,A J Schwartz ,T K Pedlar ,Y J Kim ,A Bożek ,K T Kim ,I Jaeglé ,M Iwasaki ,J H Kim ,J B Kim ,D H Lee ,X He ,L E Piilonen ,J S Lange ,L Šantelj ,M E Sevior ,B G Cheon ,M Z Wang ,T E Browder ,Y S Sohn ,D M Asner ,S L Olsen ,Z P Zhang ,D Y Kim ,K M Williams ,J G Shiu ,G B Mohanty ,H J Kim ,M J Kim ,H K Moon ,Hyangkyu Park ,T A Shibata ,M N Wagner ,S H Kim ,B R Ko ,Andreas Heller ,J E Fast ,A M Bakich ,C H Wang ,B G Fulsom

doi:10.1103/physrevd.92.051102

Abstract

We report a measurement of the branching fraction of B+ -> tau(+) nu(tau) decays using a data sample of 772 x 10(6) B (B) over bar pairs, collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. We reconstruct the accompanying B meson in a semileptonic decay and detect the recoiling B candidate in the decay channel B+ -> tau(+) nu(tau). We obtain a branching fraction of B(B+ -> tau(+) nu(tau)) = [1.25 +/- 0.28(stat.) +/- 0.27(syst.)] x 10-(4). This result is in good agreement with previous measurements and the expectation from the calculation based on the Standard Model.

Full Text