Mass spectra and decays of open-heavy tetraquark states

The observation of the exotic states ${X}_{0,1}(2900)$ with four open flavors by LHCb Collaboration has promoted great interest in searching for open-charm and open-bottom tetraquark states. In this work, we perform a systematic study open-heavy systems $qq\overline{q}\overline{Q}$ ($q=u$, $d$, $s$ $Q=c$, $b$) within improved chromomagnetic interaction model. mass spectra color-spin wave functions $S$-wave quantum numbers ${J}^{P}={0}^{+}$, ${1}^{+}$, ${2}^{+}$ are calculated. A number compact predicted both systems. two-body decay properties these phenomenologically analyzed. Our results suggest that state ${X}_{0}(2900)$ observed is likely $I{J}^{P}=0{0}^{+}$ (isospin singlet). For systems, our also candidate ${X}^{\ifmmode\pm\else\textpm\fi{}}(5568)$ reported D0 Collaboration. other work may be examined future experiments.