Measurement of the B ¯ → X s γ branching fraction with a sum of exclusive decays

Hideaki Aihara,S Al Said,K Arinstein, D M Asner,T Aushev,R Ayad,A Chen,B G Cheon,K Chilikin,K Cho,V Chobanova,S K Choi,Y Choi,D Cinabro,J Dalseno,T Ferber,D Cervenkov,T E Browder, M Bracko, A Bozek,G Bonvicini,Z Drasal,A Drutskoy,A M Bakich,Vikas Bansal,B Bhuyan,A Bobrov,A Bondar,S Eidelman,H Farhat, J Fast,M Danilov, J Dingfelder,Z Doležal,Takashi Saito,A Ishikawa,Hitoshi Yamamoto,A Abdesselam,I Adachi, Y S Sohn,F Simon,A Moll,Takahide Mori,R Mussa, Y Unno,S Uno,T A Shibata,C P Shen,V Shebalin,M E Sevior,O Seon,K Senyo,A J Schwartz, C Schwanda,G Schnell,O Schneider, V Savinov, Yasunori Sato,T Sanuki,L Santelj,S Sandilya, Y Sakai,S Ryu,A Rostomyan,M Ritter, E Ribežl,L E Piilonen, M Petric, R Pestotnik,T K Pedlar,E Nakano,M Nakao,Hiroyuki Nakazawa,T Nanut,Z Natkaniec,K M Williams,Yutaka Watanabe,M Watanabe,X L Wang,Hongkyu Park,C W Park,G Pakhlova,P Pakhlov,C Oswald,S L Olsen,Peng Wang,C H Wang, M N Wagner,A Vossen,V Vorobyev, A Vinokurova, G Varner,P Vanhoefer,C Van Hulse,Y Usov,S Okuno,Y Ushiroda,P Urquijo,S Ogawa,Shinya Nishida,N K Nisar,T Kawasaki,E Kato,Kyung Ho Kang,T Julius,D Joffe, I Jaegle, Y Iwasaki,R Itoh,K Inami, T Iijima,H J Hyun, W S Hou,Takeo Horiguchi,Takeo Higuchi,X H He, H Hayashii,Kazuhiro Hayasaka, J Hasenbusch,Takeshi Hara,J Haba,B Golob,Y M Goh,D Matvienko,K Miyabayashi,H Miyata,R Mizuk, G B Mohanty,T Uglov,Masaki Uchida,K Trabelsi,Y Teramoto,G Tatishvili,U Tamponi,T Sumiyoshi, M Steder, M Staric,E Solovieva, S Yashchenko, Y Yook,Y Yusa, Z P Zhang,V Zhilich,V Zhulanov, A Zupanc,J G Shiu,B Shwartz,A Sibidanov,T Kuhr,B Kronenbitter, J S Lange,Y J Kwon, H Kichimi,C Kiesling,D Y Kim, H J Kim,Jae Bum Kim,In Soo Lee, Yuliang Li,L Li Gioi,J Libby,D Liventsev,P Lukin,R Gillard, D Getzkow,A Garmash, Sanmay Ganguly,N Gabyshev,V Gaur,Min Ji Kim, S H Kim,Yong Joo Kim,K Kinoshita,B R Ko,P Kodys,S Korpar,P Križan,P Krokovny,E Won,J Yamaoka

Physical Review D（2015）

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摘要

We use 772×106 BB¯ meson pairs collected at the ?(4S) resonance with the Belle detector to measure the branching fraction for B¯→Xsγ. Our measurement uses a sum-of-exclusives approach in which 38 of the hadronic final states with strangeness equal to +1, denoted by Xs, are reconstructed. The inclusive branching fraction for MXs<2.8GeV/c2, which corresponds to a minimum photon energy of 1.9 GeV, is measured to be B(B¯→Xsγ)=(3.51±0.17±0.33)×10-4, where the first uncertainty is statistical and the second is systematic.

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