Kavli Affiliate: Jonathan L. Rosner
| First 5 Authors: Marek Karliner, Jonathan L. Rosner, , ,
| Summary:
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 $cs bar ubar d$ isosinglet compact tetraquark, calculating its
mass to be $2863 {pm} 12$ MeV. This is the first exotic hadron with open heavy
flavor. The analogous $bsbar ubar d$ tetraquark is predicted at $6213 {pm}
12$ MeV. We discuss possible interpretations of the heavier and wider
$X_1(2900)$ state and examine potential implications for other systems with two
heavy quarks.
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