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 2003/01
形態種別 学術雑誌
標題 Measurement of the Electroweak Penguin Process B → Xs L+ L-
執筆形態 共著
掲載誌名 Phys. Rev. Lett. 90, 021801 (2003)(6pages)
概要 J. Kaneko, S. Okuno, et al. [Belle Collaboration]
, We report the first measurement of the branching fraction for the inclusive decay B → XsL+L-, where L is either an electron or a muon, and Xs is a hadronic recoil system that contains an s quark. We analyzed a data sample of 65.4×106B meson pairs collected with the Belle detector at the KEKB e+e- asymmetric-energy collider. We find B(B → XsL+L-) = [6.1 ± 1.4(stat) -1.1+1.4(syst)]×10-6 for dilepton masses greater than 0.2 GeV/c2.