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We investigate the $ \mathcal{O}\left( {{\alpha_s}} \right) $ corrections to e+e− → J/ψ(ψ′) + χcJ (J =0, 1, 2) in the NRQCD factorization approach. These next-to-leading order (NLO) corrections are calculated at the level of helicity amplitude. We have made a detailed analysis for both polarized and unpolarized cross sections, and compared our predictions with the measurements at the B...
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