研究者情報 | 神奈川大学

オクノ　ショウジ Okuno Shoji 奥野　祥二所属神奈川大学情報学部システム数理学科職種助教
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}⁰ → D⁺L^-{ν}) and Determination of \|V_cb\|
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}⁰ → D⁺L^-{ν}, where can be either an electron or a muon. We find γ({B}⁰ → D⁺L^-{ν}) = (13.79±0.76±2.51)ns^-1, and the resulting branching fraction B({B}⁰ → D⁺L^-{ν}) = (2.13±0.12±0.39)%, where the first error is statistical and the second systematic. We also investigate the {B}⁰ → D⁺L^-{ν} form factor and the implications of the result for \|V_cb\|. From a fit to the differential decay distribution we obtain the rate normalization \|V_cb\|F_D(1) = (4.11±0.44±0.52) × 10^-2. Using a theoretical calculation of F_D(1), the Cabibbo-Kobayashi-Maskawa matrix element \|V_cb\| = (4.19±0.45±0.53±0.30) × 10^-2 is obtained, where the last error comes from the theoretical uncertainty of F_D(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.