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Inclusive productions of $J/ψ+η_c$ in $e^{+}e^{-}$ annihilation at Belle
We study $e^{+}e^{-} \to J/ψ+η_c+X$ at next-to-leading order (NLO) in $α_s$ within the nonrelativistic QCD (NRQCD) framework to assess the color-octet (CO) mechanism at low energies. QCD corrections significantly enhance both color-singlet (CS) and CO leading-order results, with non-negligible QED-d
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