Вы находитесь на старом сайте НГУ. Перейти на новый сайт

ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2005, vol. 72, p. -

Improved measurement of the electroweak penguin process B→Xs+-

Iwasaki M., Itoh K., Aihara H., Abe K., Abe K., Adachi I., Asano Y., Aushev T., Bahinipati S., Bakich A. M., Banerjee S., Bedny I., Bitenc U., Bizjak I., Blyth S., Bondar A., Bozek A., Bračko M., Brodzicka J., Browder T. E., Chang M. C., Chang P., Chao Y., Chen A., Chen K. F., Chen W. T., Cheon B. G., Chistov R., Choi S. K., Choi Y., Chuvikov A., Dalseno J., Danilov M., Dash M., Drutskoy A., Eidelman S., Enari Y., Fratina S., Gabyshev N., Gershon T., Gokhroo G., Golob B., Gorišek A., Haba J., Hara T., Hastings N. C., Hayasaka K., Hayashii H., Hazumi M., Hokuue T., Hoshi Y., Hou S., Hou W. S., Hsiung Y. B., Iijima T., Imoto A., Inami K., Ishikawa A., Ishino H., Itoh R., Kang J. H., Kang J. S., Katayama N., Kawai H., Kawasaki T., Khan H. R., Kichimi H., Kim H. J., Kim S. K., Kim S. M., Kinoshita K., Križan P., Krokovny P., Kulasiri R., Kumar S., Kuo C. C., Kuzmin A., Kwon Y. J., Lange J. S., Leder G., Lee S. E., Lesiak T., Li J., Lin S. W., Liventsev D., MacNaughton J., Majumder G., Mandl F., Matsumoto T., Matyja A., Mikami Y., Mitaroff W., Miyabayashi K., Miyake H., Miyata H., Mizuk R.

We present an improved measurement of the branching fraction for the electroweak penguin process B→Xs+-, where is an electron or a muon and Xs is a hadronic system containing an s-quark. The measurement is based on a sample of 152×106 Υ(4S)→BB̄ events collected with the Belle detector at the KEKB energy asymmetric e+e- collider. The Xs hadronic system is reconstructed from one K± or KS0 and up to four pions, where at most one pion can be neutral. Averaging over both lepton flavors, the inclusive branching fraction is measured to be B(B→Xs+-)=(4.11±0.83(stat)-0.81+0. 85(syst))×10-6 for M+->0.2GeV/c2. © 2005 The American Physical Society.