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	Determination of \|V_cb\| using the semileptonic decay B → D^+e^-*{ν}
執筆形態	共著
掲載誌名	Physics Letters B: Volume 526 (3-4), (2002)
巻・号・頁	247-257頁
概要	K. Abe, S. Okuno, et al. [Belle Collaboration] , We present a measurement of the Cabibbo-Kobayashi-Maskawa (CKM) matrix element \|V_cb\| using a 10.2fb^-1 data sample recorded at the υ(4S) resonance with the Belle detector at the KEKB asymmetric e⁺e^- storage ring. By extrapolating the differential decay width of the {B}⁰ → D^+e^-{ν} decay to the kinematic limit at which the D^+ is at rest with respect to the {B}⁰, we extract the product of \|V_cb\| with the normalization of the decay form factor F(1), \|V_cb\|F(1) = (3.54±0.19±0.18) × 10^-2, where the first error is statistical and the second is systematic. A value of \|V_cb\| = (3.88±0.21±0.20±0.19) × 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({B}⁰ → D^+e^-*{ν}) is measured to be (4.59±0.23±0.40) × 10^-2.