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Observation of B+ --> plambdagamma |
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| Authors: | Lee Y-J Wang M-Z Abe K Abe K Aihara H Asano Y Aulchenko V Aushev T Bahinipati S Bakich A M Bedny I Bitenc U Bizjak I Bondar A Bozek A Bracko M Brodzicka J Browder T E Chang M-C Chang P Chao Y Chen A Chen K-F Chen W T Cheon B G Chistov R Choi S-K Chuvikov A Cole S Dalseno J Danilov M Dash M Drutskoy A Eidelman S Enari Y Fang F Fratina S Gabyshev N Garmash A Gershon T Gokhroo G Golob B Gorisek A Haba J Hayasaka K Hazumi M Hinz L Hokuue T Hoshi Y Hou S Hou W-S Hsiung Y B Iijima T Imoto A Inami K Ishikawa A Itoh R Iwasaki M Iwasaki Y Kang J H Kang J S Kapusta P Katayama N Kawai H Kawasaki T |
| Institution: | Department of Physics, National Taiwan University, Taipei. |
| Abstract: | We report the first observation of the radiative hyperonic B decay B+ --> plambdagamma, using a 140 fb(-1) data sample recorded on upsilom(4S) resonance with the Belle detector at the KEKB asymmetric energy e+e- collider. The measured branching fraction is symbol: see text](B+ --> plambdagamma) = (2.16(+0.58)(-0.53) +/- 0.20) x 10(-6). We examine its M(plambda) distribution and observe a peak near threshold. This feature is expected by the short-distance b --> sgamma transition. A search for B+ --> pepsilon0gamma yields no significant signal, and we set a 90% confidence-level upper limit on the branching fraction of symbol: see textB+ --> pepsilon0gamma <4.6 x 10(-6). |
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