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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2002, vol. 547, p. 181-192

Measurement of the inclusive semileptonic branching fraction of B mesons and |Vcb|

Abe K., Abe K., Abe T., Adachi I., Byoung S. A., Aihara H., Akatsu M., Asano Y., Aso T., Aulchenko V., Aushev T., Bakich A. M., Ban Y., Banas E., Bay A., Bedny I., Behera P. K., Bondar A., Bozek A., Bracko M., Brodzicka J., Browder T. E., Casey B. C K, Chang P., Chao Y., Cheon B. G., Chistov R., Choi S. K., Choi Y., Danilov M., Dong L. Y., Drutskoy A., Eidelman S., Eiges V., Enari Y., Fang F., Fukunaga C., Gabyshev N., Garmash A., Gershon T., Golob B., Gotow K., Guo R., Hanagaki K., Handa F., Hara K., Hara T., Hastings N. C., Hayashii H., Hazumi M., Heenan E. M., Higuchi I., Higuchi T., Hojo T., Hokuue T., Hoshi Y., Hou S. R., Hou W. S., Hsu S. C., Huang H. C., Igaki T., Igarashi Y., Iijima T., Inami K., Ishikawa A., Ishino H., Itoh R., Iwasaki H., Iwasaki Y., Jang H. K., Kakuno H., Kaneko J., Kang J. H., Kang J. S., Kapusta P., Kataoka S. U., Katayama N., Kawai H., Kawakami Y., Kawamura N., Kawasaki T., Kichimi H., Kim D. W., Heejong K., Kim H. J., Kim H. O., Hyunwoo K., Kim S. K., Kim T. H., Kinoshita K., Kobayashi S., Krokovny P., Kulasiri R., Kumar S., Kuzmin A., Kwon Y. J., Lange J. S.

We present a measurement of the electron spectrum from inclusive semileptonic B decay, using 5.1 fb-1 of γ(4S) data collected with the Belle detector. A high-momentum lepton tag was used to separate the semileptonic B decay electrons from secondary decay electrons. We obtained the branching fraction, β(B → Xe+v) = (10.90 ± 0.12 ± 0.49)%, with minimal model dependence. From this measurement, we derive a value for the Cabibbo-Kobayashi-Maskawa matrix element |Vcb|= 0.0408 ± 0.0010(exp) ± 0.0025(th). © 2002 Elsevier Science B.V. All rights reserved.