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 2002/09
形態種別 学術雑誌
標題 Observation of the ηc(2S) in Exclusive B → KKSK-π+ Decays
執筆形態 共著
掲載誌名 Phys. Rev. Lett. 89, 102001 (2002)(5pages)
概要 S.-K. Choi, S. Okuno, et al. [Belle Collaboration]
, We report the observation of a narrow peak in the KSK-π+ invariant mass distribution in a sample of exclusive B → KKSK-π+ decays collected with the Belle detector at the KEKB asymmetric e+e- collider. The measured mass of the peak is M = 3654±6(stat)±8(syst) MeV/c2, and we place a 90% confidence level upper limit on the width of Γ<55 MeV/c2. The properties agree with heavy-quark potential model expectations for the ηc(2S) meson, the n = 2 singlet S charmonium state.