NLO QCD corrections to ηc+hc(1P)/ψ1,2(1D) production at B-factories**Supported by Ministry of Science and Technology of the People's Republic of China (2015CB856703) and National Natural Science Foundation of China (11175249, 11375200)

Abstract

We calculate the next-to-leading order (NLO) quantum chromodynamics (QCD) corrections to double charmonium production processes e+e− → γ* → ηc+hc(1P)/ψ1,2(1D) within the non-relativistic QCD (NRQCD) factorization framework. We find that the corrections to ηc+hc(1P) production are positive, while those to ηc+ψ1,2(1D) are negative. Unlike the J/ψ+ηc case, all the corrections here are not large. Uncertainties in the renormalization scale, quark mass and running energy of center-of-mass are discussed, and the scale dependence of these processes is found to be greatly reduced with the NLO QCD corrections.