Script O(αsυ2) correction to J/ψ plus ηc production in e+e- annihilation at √s = 10.6 GeV

Based on the nonrelativistic QCD factorization approach, Script O(α_sυ²) corrections to J/ψ plus η_c production in e⁺e^- annihilation at √s = 10.6 GeV are calculated in this work. The numerical results show that the correction at α_sυ² order is only about a few percent of the total theoretical result. This indicates that the perturbative expansions become convergent and that a higher order correction will be smaller. The uncertainties from the long-distance matrix elements, renormalization scale and the measurement in the experiment are also discussed. Our result is in agreement with the previous result by Jia.