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Observation of B+-->K1(1270)+gamma |
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| Authors: | Yang Heyoung Nakao M Abe K Abe K Aihara H Asano Y Aushev T Bahinipati S Bakich A M Ban Y Bedny I Bitenc U Bizjak I Blyth S Bondar A Bozek A Bracko M Brodzicka J Browder T E Chang M-C Chang P Chao Y Chen A Chen W T Cheon B G Chistov R Choi S-K Choi Y Choi Y K Chuvikov A Cole S Dalseno J Dash M Eidelman S Enari Y Fang F Gabyshev N Garmash A Gershon T Gokhroo G Golob B Haba J Hayasaka K Hayashii H Hazumi M Hinz L Hokuue T Hoshi Y Hsiung Y B Iijima T Imoto A Inami K Iwasaki Y Kang J H Kang J S Kataoka S U Katayama N Kawai H Kawasaki T Khan H R Kichimi H Kim H J Kim J H Kim S K Kim S M Kim T H |
| Affiliation: | Seoul National University, Seoul, Korea. |
| Abstract: | We report the observation of the radiative decay B+-->K1(1270)(+) gamma using a data sample of 140 fb(-1) taken at the Upsilon(4S) resonance with the Belle detector at the KEKB e+e- collider. We find the branching fraction to be B(B+-->K1(1270)(+)gamma)=(4.3+/-0.9(stat.)+/-0.9(syst.))x10(-5) with a significance of 7.3sigma. We find no significant signal for B+-->K1(1400)(+)gamma and set an upper limit B(B+-->K1(1400)(+)gamma)<1.5 x 10(-5) at the 90% confidence level. We also measure inclusive branching fractions for B+-->K+pi+pi-gamma and B0-->K0pi+pi-gamma in the mass range 1 GeV/c(2) |
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