Measurement of the inclusive semileptonic branching fraction Bf(B_s^0 -> X^- l^+ nu) at Belle

C Oswald, P Urquijo, J Dingfelder,I Adachi,H Aihara,K Arinstein,D M Asner,T Aushev,A M Bakich,K Belous,V Bhardwaj,B Bhuyan,A Bondar,G Bonvicini,A Bozek,M Bracko,T E Browder,Paoti Chang,V Chekelian,A Chen,Ping Chen, B G Cheon,K Chilikin,R Chistov,K Cho,V Chobanova,S K Choi,Y Choi,D Cinabro,J Dalseno,Z Doležal, Z Drasal,A Drutskoy,Dipanwita Dutta,S Eidelman,S Esen,H Farhat, J Fast,V Gaur,N Gabyshev,Sanmay Ganguly,R Gillard,Y M Goh,B Golob,J Haba,K Hayasaka, H Hayashii,Y Horii,Y Hoshi,W S Hou,H J Hyun, T Iijima,A Ishikawa,R Itoh, Y Iwasaki,D H Kah,J H Kang,E Kato,Tomio Kawasaki,C Kiesling,H O Kim,Joon Bum Kim,Kwang Taik Kim,M J Kim,Y J Kim,K Kinoshita, J Klucar,B R Ko,S Korpar,Richard T Kouzes, P Križan,P Krokovny,B Kronenbitter,T Kuhr,T Kumita,Y J Kwon,S H Lee,Jie Li,Yanping Li,J Libby,Chong Liu,Yuan Liu,Z Q Liu,D Liventsev,R Louvot,O Lutz, D Matvienko,K Miyabayashi,H Miyata,R Mizuk, G B Mohanty,A Moll,N Muramatsu,Y Nagasaka,E Nakano, M Nakao,E Nedelkovska,N K Nisar

PHYSICAL REVIEW D（2013）

引用 12|浏览84

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摘要

We report a measurement of the inclusive semileptonic B-s(0) branching fraction in a 121 fb(-1) data sample collected near the Y(5S) resonance with the Belle detector at the KEKB asymmetric energy e(+)e(-) collider. Events containing B-s(0(*))(B) over bar (0(*))(s) pairs are selected by reconstructing a tag side D-s(+) and identifying a signal side lepton l(+) (l = e, mu) that is required to have the same- sign charge to ensure that both originate from different B-s(0) mesons. The B-s(0) -> X(-)l(+)v(l) branching fraction is extracted from the ratio of the measured yields of D-s(+) mesons and D(s)(+)l(+) pairs and the known production and branching fractions. The inclusive semileptonic branching fraction is measured to be [10.6 +/- 0.5(stat) +/- 0.7(syst)]%.

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