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 2002/02
形態種別 学術雑誌
標題 Production of Prompt Charmonia in e+e- Annihilation at §qrt{s} ≈ 10.6 GeV
執筆形態 共著
掲載誌名 Physical Review Letters:Volume88, 052001 (2002)
概要 K. Abe, S. Okuno, et al. [Belle Collaboration] ,
The production of prompt J/ψ,ψ(2S), χc1, and χc2 is studied using a 32.4fb-1 data sample collected with the Belle detector at υ(4S) and at 60 MeV below the resonance. The yield of prompt J/ψ mesons in the υ(4S) sample is compatible with that of continuum production; we set an upper limit B(υ(4S) → JX) < 1.9 × 10-4 at the 95% confidence level, and find σ(e+e-JX) = 1.47±0.10±0.13pb. The cross sections for prompt ψ(2S) and direct J/ψ are measured. The J/ψ momentum spectrum, production angle distribution, and polarization are studied.