Xiang-Yu Chang

NNLO QCD corrections to direct $J/\psi$ production with open charm at B factories

We calculate the next-to-next-to-leading-order (NNLO) QCD corrections to direct colour-singlet $J/\psi$ 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 $\mu_R=2m_c$, we obtain an approximate NNLO cross section of $0.324^{+...