QCD corrections to J/ψ plus ηc production in e+e- annihilation at s=10.6GeV

Next-to-leading-order QCD corrections to J/ψ plus η_c production in e⁺e^- annihilation at s=10.6GeV are calculated in this paper, and an analytic result is obtained. By choosing proper physical parameters, a K factor (ratio of next-to-leading order to LO) of about 2, which is in agreement with the result in Y.-J. Zhang, Y.-j. Gao, and K.-T. Chao, Phys. Rev. Lett. 96, 092001 (2006)PRLTAO0031-900710.1103/PhysRevLett.96.092001, is obtained. The plot of the K factor vs the center-of-mass energy s shows that it is more difficult to obtain a convergent result from the perturbative QCD without resummation of ln⁡(s/m_c²) terms as the s becomes larger.