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Observation of B_(s)(0)-->phigamma and search for B_(s)(0)-->gammagamma decays at Belle |
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| Authors: | Wicht J Adachi I Aihara H Arinstein K Aulchenko V Aushev T Bakich A M Balagura V Bay A Belous K Bhardwaj V Bitenc U Bondar A Bozek A Bracko M Browder T E Chang P Chao Y Chen A Chen K-F Chen W T Cheon B G Chistov R Cho I-S Choi Y Dalseno J Dash M Drutskoy A Eidelman S Gabyshev N Goldenzweig P Golob B Haba J Hayasaka K Hazumi M Heffernan D Hoshi Y Hou W-S Hsiung Y B Hyun H J Iijima T Inami K Ishikawa A Ishino H Itoh R Iwasaki Y Kah D H Kaji H Kang J H Kapusta P Kawai H Kawasaki T Kichimi H Kim H J Kim H O Kim S K Kim Y J Kinoshita K Korpar S Krizan P Kumar R Kuo C C Kwon Y-J Lange J S Lee J |
| Affiliation: | Budker Institute of Nuclear Physics, Novosibirsk. |
| Abstract: | We search for the radiative penguin decays B_{s}{0}-->varphigamma and B_{s}{0}-->gammagamma in a 23.6 fb{-1} data sample collected at the Upsilon(5S) resonance with the Belle detector at the KEKB e{+}e{-} asymmetric-energy collider. We observe for the first time a radiative penguin decay of the B_{s}{0} meson in the B_{s}{0}-->varphigamma mode and we measure B(B_{s}{0}-->varphigamma)=(57_{-15}{+18}(stat)-11+12(syst))x10{-6}. No significant B_{s}{0}-->gammagamma signal is observed and we set a 90% confidence level upper limit of B(B_{s}{0}-->gammagamma)<8.7x10{-6}. |
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