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

作者：ZHANG Hai Xia~ WANG Wen Ling~ DAI Yuan Ben~ ZHANG Zong Ye~ Institute of High Energy Physics the Chinese Academy of Sciences P O Box Beijing China Institute of Particle Physics Central China Normal University Wuhan China Institute of Theoretical Physics the Chinese Academy of Sciences P O Box Beijing China

来源：Communications in Theoretical Physics, 2008, (02): 414-420.

• four-quark states
• quark model
• chiral symmetry

<正> The new members of the charm-strange family DsJ*（2317）,DsJ（2460）,and Ds（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 JP=0+ might not be D,（2632）.At thesame time,we also conclude that DsJ*（2317） and DsJ （2460） cannot be explained as the pure four-quark state.