Вы находитесь на старом сайте НГУ. Перейти на новый сайт

ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2004, vol. 69, p. -

Measurement of the B→L*γ branching fractions and asymmetries

Nakao M., Abe K., Abe K., Abe T., Adachi I., Aihara H., Akatsu M., Asano Y., Aso T., Aulchenko V., Aushev T., Bahinipati S., Bakich A. M., Ban Y., Bay A., Bitenc U., Bizjak I., Bondar A., Bozek A., Bračko M., Browder T. E., Chang P., Chao Y., Chen K. F., Cheon B. G., Chistov R., Choi Y., Chuvikov A., Cole S., Danilov M., Dash M., Dong L. Y., Dragic J., Drutskoy A., Eidelman S., Eiges V., Enari Y., Fang F., Fratina S., Gabyshev N., Garmash A., Gershon T., Gokhroo G., Golob B., Hayashii H., Hazumi M., Higuchi T., Hinz L., Hokuue T., Hoshi Y., Hou W. S., Hsiung Y. B., Iijima T., Inami K., Ishikawa A., Ishino H., 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., Kinoshita K., Koppenburg P., Korpar S., Križan P., Krokovny P., Kuzmin A., Kwon Y. J., Lange J. S., Lee S. H., Lesiak T., Li J., Limosani A., Lin S. W., MacNaughton J., Majumder G., Mandl F., Matsumoto T., Mikami Y., Mitaroff W., Miyabayashi K., Miyake H., Miyata H., Mohapatra D., Moloney G. R., Mori T., Nagamine T.

We report measurements of the radiative decay B→K*γ. The analysis is based on a data sample containing 85.0 × 10 6 B meson pairs collected by the Belle detector at the KEKB storage ring. We measure branching fractions of β(B 0→K* 0γ) = (4.01±0.21±0.17)× 10 -5 and β(B + →K* + γ) = (4.25±0.31±0.24)× 10 -5, where the first and second errors are statistical and systematic, respectively. The isospin asymmetry between B 0 and B + decay widths is measured to be Δ 0+ = + 0.012±0.044±0.026, assuming an equal production rate for B 0B̄ 0 and B +B - pairs from the γ(4S) resonance. We search for a partial rate asymmetry between CP conjugate modes, and find A CP(B→K*γ) = -0.015±0.0447plusmn;0.012. © 2004 The American Physical Society.