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NNLO QCD corrections to direct $J/ψ$ production with open charm at B factories
We calculate the next-to-next-to-leading-order (NNLO) QCD corrections to direct colour-singlet $J/ψ$ production with open charm at B factories, using nested soft-collinear subtraction for massive partons. At $\sqrt{s}=10.6$ GeV, $m_c=1.5$ GeV and $μ_R=2m_c$, we obtain an approximate NNLO cross secti
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