Search For B-S(0) -> Gamma Gamma And A Measurement Of The Branching Fraction For B-S(0) -> Phi Gamma

D Dutta,B Bhuyan,A Abdesselam,I Adachi,H Aihara,S Al Said,K Arinstein,D M Asner,V Aulchenko,T Aushev,R Ayad,T Aziz, S Bahinipati,A M Bakich,Vikas Bansal,V Bhardwaj,A Bobrov,G Bonvicini,M Bracko,T E Browder, D Cervenkov,A Chen,B G Cheon,K Chilikin,R Chistov,K Cho,V Chobanova,Yuri Choi,D Cinabro,J Dalseno,Z Doležal, Z Drasal,A Drutskoy,K Dutta,S Eidelman,H Farhat, J Fast,O Frost,V Gaur,Sanmay Ganguly,A Garmash, D Getzkow, Y M Goh, B Golob, H Hayashii,X H He,W S Hou,T Iijima,A Ishikawa, Y Iwasaki, I Jaegle,D Joffe,Kyung Ho Kang,Eriko Kato, C Kiesling,Do Young Kim,J B Kim,K T Kim,M J Kim, S H Kim,Young Jo Kim,K Kinoshita, B R Ko, P Kodys, S Korpar, P Križan,P Krokovny,T Kuhr,A Kuzmin,Y J Kwon,J S Lange,I S Lee,P Lewis,Yanping Li,L Li Gioi,J Libby,D Liventsev, D Matvienko,H Miyata,R Mizuk,G B Mohanty,A Moll,Takeo Mori, R Mussa, E Nakano, M Nakao,T Nanut,M Nayak,N K Nisar,S Nishida,Sumito Ogawa, S Okuno,P Pakhlov,G Pakhlova,T K Pedlar, R Pestotnik, M Petric,L E Piilonen

PHYSICAL REVIEW D（2015）

引用 26|浏览41

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摘要

We search for the decay B-s(0) -> gamma gamma and measure the branching fraction for B-s(0) -> phi gamma using 121.4 fb(-1) of data collected at the Upsilon(5S) resonance with the Belle detector at the KEKB asymmetric- energy e(+)e(-) collider. The B-s(0) -> phi gamma branching fraction is measured to be (3.6 +/- 0.5(stat) +/- 0.3(syst) +/- 0.6(f(s))) x 10(-5), where f(s) is the fraction of B-s(()*())(B) over barB(s)(()*()) in b (b) over bar events. Our result is in good agreement with the theoretical predictions as well as with a recent measurement from LHCb. We observe no statistically significant signal for the decay B-s(0) -> gamma gamma and set a 90% confidence- level upper limit on its branching fraction at 3.1 x 10(-6). This constitutes a significant improvement over the previous result.

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