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Inclusive measurement of the photon energy spectrum in b --> sgamma decays |
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| Authors: | Koppenburg P Abe K Abe K Abe T Adachi I Aihara H Akatsu M Asano Y Aulchenko V Aushev T Bakich A M Ban Y Bay A Bitenc U Bizjak I Bondar A Bozek A Bracko M Browder T E Chang P Chao Y Chen K-F Cheon B G Choi Y Chuvikov A Cole S Danilov M Dash M Dong L Y Drutskoy A Eidelman S Eiges V Enari Y Fang F Fratina S Gabyshev N Garmash A Gershon T Gokhroo G Golob B Haba J Hayashii H Hazumi M Higuchi T Hinz L Hokuue T Hoshi Y Hou W-S Hsiung Y B Iijima T Inami K Ishikawa A Itoh R Iwasaki H Iwasaki M Kang J H Kang J S Katayama N Kawai H Kawasaki T Kichimi H Kim H J Kim J H Kim S K Kim T H Korpar S Krizan P |
| Affiliation: | High Energy Accelerator Research Organization (KEK), Tsukuba, Japan. |
| Abstract: | We report a fully inclusive measurement of the flavor changing neutral current decay b --> sgamma in the energy range 1.8 GeV < or = E*gamma < or = 2.8 GeV, covering 95% of the total spectrum. Using 140 fb(-1), we obtain B(b --> sgamma) = (3.55+/-0.32(+0.30+0.11)(-0.31-0.07)) x 10(-4), where the errors are statistical, systematic, and from theory corrections. We also measure the first and second moments of the photon energy spectrum above 1.8 GeV and obtain (Egamma) = 2.292+/-0.026+/-0.034 GeV and (E2gamma) - (Egamma)2 = 0.0305+/-0.0074+/-0.0063 GeV2, where the errors are statistical and systematic. |
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