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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2003, vol. 90, p. 021801/1-021801/6

Measurement of the electroweak penguin process B → Xsℓ+ℓ-

Kaneko J., Abe K., Abe K., Abe T., Adachi I., Ahn B. S., Aihara H., Akatsu M., Asano Y., Aso T., Aulchenko V., Aushev T., Bakich A. M., Ban Y., Banas E., Bartel W., Bay A., Behera P. K., Bondar A., Bozek A., Bračko M., Brodzicka J., Browder T. E., Casey B. C K, Chang P., Chao Y., Chen K. F., Cheon B. G., Chistov R., Choi Y., Choi Y. K., Danilov M., Dong L. Y., Eidelman S., Eiges V., Enari Y., Everton C. W., Fang F., Fujii H., Fukunaga C., Gabyshev N., Garmash A., Gershon T., Guo R., Haba J., Handa F., Hara T., Harada Y., Hastings N. C., Hayashii H., Hazumi M., Heenan E. M., Higuchi I., Higuchi T., Hinz L., Hojo T., Hoshi Y., Hou W. S., Huang H. C., Igaki T., Igarashi Y., Iijima T., Inami K., Ishikawa A., Ishino H., Itoh R., Iwasaki H., Iwasaki Y., Jang H. K., Kang J. H., Kang J. S., Katayama N., Kawai H., Kawakami Y., Kawamura N., Kawasaki T., Kichimi H., Kim D. W., Kim Heejong, Kim H. J., Kim H. O., Kim Hyunwoo, Kim S. K., Kinoshita K., Kobayashi S., Korpar S., Križan P., Krokovny P., Kulasiri R., Kumar S., Kwon Y. J., Lange J. S., Leder G., Lee S. H., Li J.

The branching fraction for the inclusive decay Β→Xsℓ+ℓ- was measured. A data sample collected at the Υ(4S) resonance with the Bell detector at the KEKB e+e- asymmetric-energy collider was used. Overall, the results are in agreement with the standard model (SM) expectations and can be used to constrain extensions of the SM.