Spectra of prompt electrons from decays of [formula omitted] and [formula omitted] mesons and ratio of inclusive semielectronic branching fractions

T Okabe,R Seuster,O Nitoh,R Chistov,S Semenov,W.-S Hou,T Nozaki,H Miyata,Y Iwasaki,J Ying,T Sumiyoshi,T Matsumoto,K Sumisawa,A Somov,F Takasaki,Y Watanabe,T Nagamine,F Mandl,S.M Kim,S Ogawa,J Dalseno,C Schwanda,D Liventsev,A Sugiyama,A Go,N Parslow,Y Choi,A Bondar,S Banerjee,M Tanaka,S Fratina,L.M Zhang,S Cole,T Aushev,C.H Wang,A Bay,H Miyake,T Uglov,O Tajima,E Nakano,K.-F Chen,H.J Kim,S Eidelman,Z Natkaniec,T Iijima,R Mizuk,Y Yamashita,H Kichimi,N Gabyshev,R Stamen,G Gokhroo,A Yamaguchi,N Tamura,M Hazumi,P Krokovny,S Hou,Y Yusa,H Hayashii,O Schneider,S Uno,V Eiges,Y Sakai,D Mohapatra,K Hayasaka,T Kawasaki,T Schietinger,M Akatsu,J.H Kim,M.-Z Wang,R Itoh,M Starič,H Kawai,M Yamauchi,L Hinz,H Park,K.S Park,P Koppenburg,V Zhilich,A Chen,W Ostrowicz,M Nakao,B Golob,M Bračko,D Žontar,R Pestotnik,N Katayama,Y Enari,C.C Wang,T Hokuue,K Kinoshita,A Chuvikov,G Majumder,S.H Lee,I Bizjak,S.E Lee,J Li,J Haba,Y Hoshi,M Dash,J Schümann,P Kapusta,I Adachi,S Korpar,T Tsukamoto,W.T Chen,S Stanič,A Drutskoy,M Watanabe,T Ohshima,M Danilov,J Brodzicka,T Gershon,Z.P Zhang,H Sagawa,Y Ban,S Suzuki,S Okuno,J Macnaughton,Y Nagasaka,W Mitaroff,C.W Park,Y Teramoto,A Garmash,S Blyth,G Varner,S Uehara,K Inami,A Matyja,A Limosani,I Bedny,J Zhang,A Imoto,H Aihara,Y Asano,A Ishikawa,T Higuchi,U Bitenc,S Nishida,T Lesiak,T Hara,N Soni,K Ueno,H Shibuya,A Bożek ,S L Olsen ,M Różańska ,H Pałka ,B G Cheon ,X C Tian ,T E Browder ,M E Sevior ,C C Kuo ,S Choi ,J Lange ,Kazuo Abe ,K E Varvell ,Y Chào ,G R Moloney ,J S Kang ,L E Piilonen ,T Sarangi ,B D Yabsley ,S W Lin ,H X Yang ,Y J Kwon ,Jagbir Singh ,A M Bakich ,J H Kang

doi:10.1016/j.physletb.2005.03.060

Abstract

We present spectra of prompt electrons from decays of neutral and charged B mesons. The results are based on 140 fb−1 of data collected by the Belle detector on the ϒ(4S) resonance at the KEKB e+e− asymmetric collider. We tag ϒ(4S)→BB¯ events by reconstructing a B meson in one of several hadronic decay modes; the semileptonic decay of the other B meson is inferred from the presence of an identified electron. We obtain for charged and neutral B mesons the partial rates of semileptonic decay, to electrons with momentum greater than 0.6 GeV/c in the B rest frame, and their ratio b+/b0=1.08±0.05±0.02, where the first and second errors are statistical and systematic, respectively.

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