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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2002, vol. 526, p. 258-268

Measurement of B(Bo - D+Í- v) and determination of | vCb |

Abe K., Abe K., Abe R., Abe T., Adachi I., Ahn Byoung Sup, Aihara H., Akatsu M., Asano Y., Aso T., Aulchenko V., Aushev T., Bakich A. M., Ban Y., Banas E., Behari S., Behera P. K., Bondar A., Bozek A., Browder T. E., Casey B. C K, Chang P., Chao Y., Cheon B. G., Chistov R., Choi S. K., Choi Y., Dong L. Y., Drutskoy A., Eidelman S., Eiges V., Everton C. W., Fang F., Fujii H., Fukunaga C., Fukushima M., Gabyshev N., Garmash A., Gershon T., Gordon A., Guo R., Haba J., Hamasaki H., 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., Hoshina K., Hou S. R., Hou W. S., Hsu S. C., Huang H. C., Igarashi Y., Iijima T., Ikeda H., Inami K., Ishikawa A., Ishino H., Itoh R., Iwasaki H., Iwasaki Y., Jackson D. J., Jalocha P., Jang H. K., Kang J. H., Kang J. S., Kapusta P., Katayama N., Kawai H., Kawai H., Kawamura N., Kawasaki T., Kichimi H., Kim D. W., Kim Heejong, Kim H. J., Kim H. O., Kim Hyunwoo, Kim S. K., Kim T. H., Kinoshita K., Konishi H., Korpar S., Križan P., Krokovny P., Kulasiri R., Kumar S., Kuzmin A.

We present a measurement of the branching fraction for the semileptonic B decay B o → D+ℓ-v, where ℓ-can be either an electron or a muon. We find Γ( o → D+ℓ-v) = (13.79 ± 0.76 ± 2.51) ns-1, and the resulting branching fraction B( 0→ D+ℓ-v) = (2.13 ± 0.12 ± 0.39)%, where the first error is statistical and the second systematic. We also investigate the Bo → D+ℓ-v form factor and the implications of the result for |VCb|. From a fit to the differential decay distribution we obtain the rate normalization |V Cb| FD(1) = (4.11 ± 0.44 ± 0.52) x 10 -2. Using a theoretical calculation of FD(1), the Cabibbo-Kobayashi-Maskawa matrix element | Vcb| = (4.19 ± 0.45 ± 0.53 ± 0.30) x 10-2 is obtained, where the last error comes from the theoretical uncertainty of FD(1). The results are based on a data sample of 10.2 fb-1 recorded at the γ(4S) resonance with the Belle detector at the KEKB e+e- collider. © 2002 Elsevier Science B.V. All rights reserved.