研究者情報 | 神奈川大学

オクノ　ショウジ Okuno Shoji 奥野　祥二所属神奈川大学情報学部システム数理学科職種助教
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/ψη_c(γ)]×B(η_c → ≥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.