Chiral SU(3) Quark Model Study of Tetraquark States: cnn̄s̄/css̄s̄

Abstract

The new members of the charm-strange family D*sJ(2317), DsJ(2460), and Ds(2632), which have the surprising properties, are challenging the present models. Many theoretical interpretations have been devoted to this issue. Most authors suggest that they are not the conventional cs̄ quark model states, but possibly are four-quark states, molecule states, or mixtures of a P-wave cs̄ and a four-quark state. In this work, we follow the four-quark-state picture, and study the masses of cnn̄s̄/css̄s̄ states (n is u or d quark) in the chiral SU(3) quark model. The numerical results show that the mass of the mixed four-quark state (cnn̄s̄/css̄s̄) with spin parity JP = 0+ might not be Ds(2632). At the same time, we also conclude that D*sJ (2317) and DsJ (2460) cannot be explained as the pure four-quark state.