Вы находитесь на старом сайте НГУ. Перейти на новый сайт

ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2015, vol. 91, 5, p. -

Measurement of the B ¯ →xsγ branching fraction with a sum of exclusive decays MEASUREMENT of THE. T. SAITO et al.

Saito T., Ishikawa A., Yamamoto H., Abdesselam A., Adachi I., Aihara H., Al Said S., Arinstein K., Asner D. M., Aushev T., Ayad R., Bakich A. M., Bansal V., Bhuyan B., Bobrov A., Bondar A., Bonvicini G., Bozek A., Bračko M., Browder T. E., Červenkov D., Chen A., Cheon B. G., Chilikin K., Cho K., Chobanova V., Choi S. K., Choi Y., Cinabro D., Dalseno J., Danilov M., Dingfelder J., DoleŽal Z., Drásal Z., Drutskoy A., Eidelman S., Farhat H., Fast J. E., Ferber T., Gaur V., Gabyshev N., Ganguly S., Garmash A., Getzkow D., Gillard R., Goh Y. M., Golob B., Haba J., Hara T., Hasenbusch J., Hayasaka K., Hayashii H., He X. H., Higuchi T., Horiguchi T., Hou W. S., Hyun H. J., Iijima T., Inami K., Itoh R., Iwasaki Y., Jaegle I., Joffe D., Julius T., Kang K. H., Kato E., Kawasaki T., Kichimi H., Kiesling C., Kim D. Y., Kim H. J., Kim J. B., Kim J. H., Kim M. J., Kim S. H., Kim Y. J., Kinoshita K., Ko B. R., Kodyš P., Korpar S., KriŽan P., Krokovny P., Kronenbitter B., Kuhr T., Kwon Y. J., Lange J. S.

We use 772×106 BB¯ meson pairs collected at the ?(4S) resonance with the Belle detector to measure the branching fraction for B¯→Xsγ. Our measurement uses a sum-of-exclusives approach in which 38 of the hadronic final states with strangeness equal to +1, denoted by Xs, are reconstructed. The inclusive branching fraction for MXs<2.8GeV/c2, which corresponds to a minimum photon energy of 1.9 GeV, is measured to be B(B¯→Xsγ)=(3.51±0.17±0.33)×10-4, where the first uncertainty is statistical and the second is systematic.