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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2004, vol. 92, p. 518011-518015

Observation of Radiative B → φKγ Decays

Drutskoy A., Abe K., Abe T., Aihara H., Akatsu M., Asano Y., Aulchenko V., Aushev T., Bakich A. M., Ban Y., Bay A., Bedny I., Behera P. K., Bizjak I., Bondar A., Bozek A., Bračko M., Browder T. E., Casey B. C K, Chao Y., Cheon B. G., Chistov R., Choi Y., Chuvikov A., Danilov M., Dash M., Dong L. Y., Eidelman S., Eiges V., Gabyshev N., Garmash A., Gershon T., Golob B., Haba J., Hagner C., Handa F., Hastings N. C., Hayashii H., Hazumi M., Hinz L., Hokuue T., Hoshi Y., Hou W. S., Huang H. C., Igarashi Y., Iijima T., Inami K., Ishikawa A., Itoh R., Iwasaki H., Iwasaki M., Iwasaki Y., Jang H. K., Kang J. H., Kang J. S., Kapusta P., Katayama N., Kawasaki T., Kichimi H., Kim D. W., Kim H. J., Kim H., Kim J. H., Kim S. K., Kinoshita K., Koppenburg P., Korpar S., Križan P., Krokovny P., Kwon Y. J., Lee S. H., Lesiak T., Li J., MacNaughton J., Marlow D., Matsumoto T., Matyja A., Mitaroff W., Miyata H., Mohapatra D., Moloney G. R., Mori T., Nagamine T., Nagasaka Y., Nakadaira T., Nakano E., Nakao M., Nam J. W., Natkaniec Z., Nishida S., Nitoh O., Ogawa S., Ohshima T., Okuno S., Olsen S. L.

The radiative decay B → φKγ, which provide an important tool to search for physics beyond the standard model is observed. An upper limit for the particular decay mode and a branching fraction for the B -→φK-γ decay mode are obtained. It is found that the measured decay branching fraction is roughly an order of magnitude smaller than B→K*γ branching fractions. This factor can be attributed to the additional electron pair.