Possible triply heavy tetraquark states in a chiral quark model

In the present work, triply heavy tetraquarks states $QQ\overline{Q}\overline{q}$ with $Q=(c,b)$ and $q=(u,d,s)$ all possible quantum numbers are systematically investigated in framework of chiral quark model resonating ground method. Two kinds structures, including meson-meson configuration (the color-singlet channels hidden-color channels) diquark-antidiquark color sextet-antisextet triplet-antitriplet), considered. considered system, several bound obtained for $cc\overline{c}\overline{{q}^{\ensuremath{'}}}$, $bb\overline{c}\overline{{q}^{\ensuremath{'}}}$, $bc\overline{c}\overline{q}$ tetraquarks. From estimations, we find that coupled-channel effect is great significance forming below-threshold tetraquark states, which stable strong decays.