Chiral SU(3) Quark Model Study of Tetraquark States: cn■/cs

The new members of the charm-strange family D;（2317）,D;（2460）,and D;（2632）,which have thesurprising properties,are challenging the present models.Many theoretical interpretations have been devoted to thisissue.Most authors suggest that they are not the conventional c quark model states,but possibly are four-quark states,molecule states,or mixtures of a P-wave c and a four-quark state.In this work,we follow the four-quark-state picture,and study the masses of cn■/cs states （n is u or d quark） in the chiral SU（3） quark model.The numerical resultsshow that the mass of the mixed four-quark state （cn■/cs） with spin parity J;=0;might not be D,（2632）.At thesame time,we also conclude that D;（2317） and D;（2460） cannot be explained as the pure four-quark state.