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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2002, vol. 526, p. 247-257

Determination of | vCb| using the semileptonic decay B 0→ D*+e-v-

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 Cabibbo-Kobayashi-Maskawa (CKM) matrix element | Vcb | using a 10.2 fb-1 data sample recorded at the γ(4S) resonance with the Belle detector at the KEKB asymmetric e +e- storage ring. By extrapolating the differential decay width of the Bo → D*+e-v decay to the kinematic limit at which the D*+ is at rest with respect to the B o, we extract the product of | Vcb | with the normalization of the decay form factor F(1), | Vcb | F(1) = (3.54 ± 0.19 ± 0.18) x 10-2, where the first error is statistical and the second is systematic. A value of | Vcb \= (3.88 ±0.21 ±0.20 ±0.19) x 10-2 is obtained using a theoretical calculation of F(1), where the third error is due to the theoretical uncertainty in the value of F(1). The branching fraction B(B0 ->• D*+e-v) is measured to be (4.59 ± 0.23 ± 0.40) x 10-2. © 2002 Elsevier Science B.V. All rights reserved.