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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2009, vol. 103, p. -

Measurement of inclusive radiative B-meson decays with a photon energy threshold of 1.7 GeV

Limosani A., Aihara H., Arinstein K., Aushev T., Bakich A. M., Balagura V., Barberio E., Bay A., Belous K., Bischofberger M., Bondar A., Bozek A., Bračko M., Browder T. E., Chang P., Chao Y., Chen A., Cheon B. G., Choi Y., Dalseno J., Danilov M., Drutskoy A., Dungel W., Eidelman S., Goldenzweig P., Golob B., Ha H., Hayashii H., Hoshi Y., Hou W. S., Hyun H. J., Inami K., Itoh R., Iwasaki Y., Julius T., Kah D. H., Kim H. O., Kim S. K., Kim Y. I., Kim Y. J., Kinoshita K., Ko B. R., Korpar S., Kreps M., Križan P., Krokovny P., Kuhr T., Kumar R., Kwon Y. J., Kyeong S. H., Lesiak T., Li J., Liu C., Liventsev D., Louvot R., Matyja A., Miyabayashi K., Miyata H., Miyazaki Y., Mizuk R., Mori T., Nakao M., Nakazawa H., Nishida S., Nishimura K., Nitoh O., Nozaki T., Ogawa S., Ohshima T., Okuno S., Ozaki H., Pakhlova G., Park C. W., Park H., Piilonen L. E., Rozanska M., Sahoo H., Sakai Y., Schneider O., Schümann J., Schwanda C., Schwartz A. J., Senyo K., Sevior M. E., Shapkin M., Shebalin V., Shen C. P., Shiu J. G., Singh J. B., Stanič S.

Using 605fb-1 of data collected at the Υ(4S) resonance we present a measurement of the inclusive radiative B-meson decay channel, B→Xsγ. For the lower photon energy thresholds of 1.7, 1.8, 1.9, and 2.0 GeV, as defined in the rest frame of the B meson, we measure the partial branching fraction and the mean and variance of the photon energy spectrum. At the 1.7 GeV threshold we obtain the partial branching fraction BF(B→Xsγ)=(3.45±0. 15±0.40)×10-4, where the errors are statistical and systematic. © 2009 The American Physical Society.