2002/11/30 by Kui-Yong Liu, Zhi-Guo He, Kuang-Ta Chao · 3 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1016/s0370-2693(03)00176-x
published as Phys.Lett.B557:45-54,2003 · 10 pages, 4 figures. A few references added, errors and typoes corrected
openalex publication_date 2003/03/01 · arxiv created 2003/03/20 · arxiv updated 2010/04/06 · openalex created_date 2019/06/27 · openalex updated_date 2026/08/01
Using the nonrelativistic QCD (NRQCD) factorization formalism, we calculate the color-singlet cross sections for exclusive production processes e++e−→J/ψ+ηc and e++e−→J/ψ+χcJ (J=0,1,2) at the center-of-mass energy s=10.6 GeV. The cross sections are estimated to be 5.5 fb, 6.7 fb, 1.1 fb, and 1.6 fb for ηc,χc0,χc1, and χc2, respectively. The calculated J/ψ+ηc production rate is smaller than the recent Belle data by about an order of magnitude, which might indicate the failure of perturbative QCD calculation to explain the double-charmonium production data. The complete O(α2s) color-singlet cross section for e++e−→χc0+cc̄ is calculated. In addition, we also evaluate the ratio of exclusive to inclusive production cross sections. The ratio of J/ψηc production to J/ψcc̄ production could be consistent with the experimental data.