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Observation of radiative B-->phi K gamma decays |
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| Authors: | Drutskoy A Abe K Abe K Abe T Aihara H Akatsu M Asano Y Aulchenko V Aushev T Bakich A M Ban Y Bay A Bedny I Behera P K Bizjak I Bondar A Bozek A Bracko M Browder T E Casey B C K Chao Y Cheon B G Chistov R Choi Y Chuvikov A Danilov M Dash M Dong L Y Eidelman S Eiges V Gabyshev N Garmash A Gershon T Golob B Haba J Hagner C Handa F Hastings N C Hayashii H Hazumi M Hinz L Hokuue T Hoshi Y Hou W-S Huang H-C Igarashi Y Iijima T Inami K Ishikawa A Itoh R Iwasaki H Iwasaki M Iwasaki Y Jang H K Kang J H Kang J S Kapusta P Katayama N Kawasaki T Kichimi H Kim D W Kim H J Kim Hyunwoo Kim J H Kim S K |
| Affiliation: | Institute for Theoretical and Experimental Physics, Moscow. |
| Abstract: | The radiative decay B-->phi K gamma is observed for the first time. The branching fraction for the charged B--->phi K- gamma decay mode is measured to be B(B--->phi K- gamma)=(3.4+/-0.9+/-0.4)x10(-6). The photon energy distribution for the B--->phi K- gamma decay is presented. The signal for the neutral B(0)-->phi K(0)gamma decay mode is not statistically significant and an upper limit, B(B(0)-->phi K(0)gamma)<8.3x10(-6) at 90% C.L., is set. The analysis is based on a data set of 90 fb(-1) collected by the Belle experiment at the e(+)e(-) asymmetric collider KEKB. |
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