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Ryan","submitted_at":"2020-08-14T15:57:46Z","abstract_excerpt":"Elastic scattering amplitudes for $I=0$ $DK$ and $I=0,1$ $D\\bar{K}$ are computed in $S$, $P$ and $D$ partial waves using lattice QCD with light-quark masses corresponding to $m_\\pi = 239$ MeV and $m_\\pi = 391$ MeV. The $S$-waves contain interesting features including a near-threshold $J^P=0^+$ bound state in $I=0$ $DK$, corresponding to the $D_{s0}^\\ast(2317)$, with an effect that is clearly visible above threshold, and suggestions of a $0^+$ virtual bound state in $I=0$ $D\\bar{K}$. The $S$-wave $I=1$ $D\\bar{K}$ amplitude is found to be weakly repulsive. 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