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Next-to-leading-order QCD study of $e^+e^- \to η_c + c\bar{c}$ at $B$ factories
We study the process $e^+e^- \to γ^\ast \to η_c + c\bar{c} + X$ at next-to-leading order (NLO) in QCD within the framework of nonrelativistic QCD (NRQCD) factorization, retaining the color-singlet contribution at leading order in the heavy-quark relative velocity $v$. At the $e^+e^-$ collision energ
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