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 2002/11
形態種別 学術雑誌
標題 Measurement of the inclusive semileptonic branching fraction of B mesons and |Vcb|
執筆形態 共著
掲載誌名 Phys.Lett. B547 (2002)
巻・号・頁 181-192頁
概要 K. Abe, S. Okuno, et al. [Belle Collaboration]
, We present a measurement of the electron spectrum from inclusive semileptonic B decay, using 5.1fb-1 of υ(4S) data collected with the Belle detector. A high-momentum lepton tag was used to separate the semileptonic B decay electrons from secondary decay electrons. We obtained the branching fraction, B(B → Xe+ν)=(10.90±0.12±0.49)%, with minimal model dependence. From this measurement, we derive a value for the Cabibbo-Kobayashi-Maskawa matrix element |Vcb| = 0.0408±0.0010(exp)±0.0025(th).