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NLO QCD Corrections to η_c+h_c(1P)/psi_(1,2)(1D) Production at B-factories
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NLO QCD Corrections to η_c+h_c(1P)/psi_(1,2)(1D) Production at B-factories
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We calculate the next-to-leading order (NLO) quantum chromodynamics (QCD) corrections to double charmonium production processes $e^+e^-\to\gamma^*\to\eta_c+h_c(1P)/\psi_{1,2}(1D)$ within the non-relativistic QCD (NRQCD) factorization framework. We find that the corrections to $\eta_c+h_c(1P)$ production are positive, while those to $\eta_c+\psi_{1,2}(1D)$ are negative. Unlike the $J/\psi + \eta_c$ 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.
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