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 Double c{c} Production in e+e- Annihilation at §qrt{s} ≈ 10.6 GeV
執筆形態 共著
掲載誌名 Phys. Rev. Lett. 89, 142001 (2002)(6pages)
概要 K. Abe, S. Okuno, et al. [Belle Collaboration]
, We report the observation of prompt J/ψ via double c{c} production from the e+e- continuum. In this process one c{c} pair fragments into a J/ψ meson while the remaining pair either produces a charmonium state or fragments into open charm. Both cases have been experimentally observed. We find cross sections of σ[e+e- → J/ψηc(γ)]×B(ηc → ≥4 charged) = (0.033-0.006+0.007±0.009) pb and σ(e+e- → J/ψ D*+X) = (0.53-0.15+0.19±0.14) pb and infer σ(e+e- → J/ψ c{c}/σ(e+e- → J/ψ X) = 0.59-0.13+0.15±0.12. These results are obtained from a 46.2fb-1 data sample collected near the υ(4S) resonance, with the Belle detector at the KEKB collider.