オクノ ショウジ   Okuno Shoji
  奥野 祥二
   所属   神奈川大学  工学部 情報システム創成学科
   職種   助教
言語種別 日本語
発行・発表の年月 2002
形態種別 学術雑誌
標題 Measurement of B({B}0D+L-{ν}) and Determination of |Vcb|
執筆形態 共著
掲載誌名 Physics Letters B: Volume 526(3-4), (2002)
巻・号・頁 258-268頁
概要 K. Abe, S. Okuno, et al. [Belle Collaboration] ,We
present a measurement of the branching fraction for the semileptonic B decay {B}0D+L-{ν}, where can be either an electron or a muon. We find γ({B}0D+L-{ν}) = (13.79±0.76±2.51)ns-1, and the resulting branching fraction B({B}0D+L-{ν}) = (2.13±0.12±0.39)%, where the first error is statistical and the second systematic. We also investigate the {B}0D+L-{ν} form factor and the implications of the result for |Vcb|. From a fit to the differential decay distribution we obtain the rate normalization |Vcb|FD(1) = (4.11±0.44±0.52) × 10-2. Using a theoretical calculation of FD(1), the Cabibbo-Kobayashi-Maskawa matrix element |Vcb| = (4.19±0.45±0.53±0.30) × 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 10.2fb-1 recorded at the υ(4S) resonance with the Belle detector at the KEKB e+e- collider.