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We interpret the $X_0(2900)$ component as a $cs \\bar u\\bar d$ isosinglet compact tetraquark, calculating its mass to be $2863 {\\pm} 12$ MeV. This is the first exotic hadron with open heavy flavor. The analogous $bs\\bar u\\bar d$ tetraquark is predicted at $6213 {\\pm} 12$ MeV. 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Rosner, Marek Karliner","submitted_at":"2020-08-13T16:15:53Z","abstract_excerpt":"The LHCb Collaboration has reported resonant activity in the channel $D^+ K^-$, identifying two components: $X_0(2900)$ with $J^P = 0^+$ at $2866 {\\pm} 7$ MeV, $\\Gamma_0=57{\\pm} 13$ MeV and $X_1(2900)$ with $J^P = 1^-$ at $2904 {\\pm} 7$ MeV, $\\Gamma_1=110{\\pm} 12$ MeV. We interpret the $X_0(2900)$ component as a $cs \\bar u\\bar d$ isosinglet compact tetraquark, calculating its mass to be $2863 {\\pm} 12$ MeV. This is the first exotic hadron with open heavy flavor. The analogous $bs\\bar u\\bar d$ tetraquark is predicted at $6213 {\\pm} 12$ MeV. 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