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.
|Number of pages||11|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - 2002|
Bibliographical noteFunding Information:
We thank Benjamin Grinstein for useful discussions. We wish to thank the KEKB accelerator group for the excellent operation of the KEKB accelerator. We acknowledge support from the Ministry of Education, Culture, Sports, Science, and Technology of Japan and the Japan Society for the Promotion of Science; the Australian Research Council and the Australian Department of Industry, Science and Resources; the Department of Science and Technology of India; the BK21 program of the Ministry of Education of Korea and the Center for High Energy Physics sponsored by the KOSEF; the Polish State Committee for Scientific Research under contract No.2P03B 17017; the Ministry of Science and Technology of Russian Federation; the National Science Council and the Ministry of Education of Taiwan; and the US Department of Energy.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics