Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-07-19
Commun.Theor.Phys.49:414-420,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
20 pages
Scientific paper
10.1088/0253-6102/49/2/35
The new members of the charm-strange family $D_{sJ}^{*}(2317)$, $D_{sJ}(2460)$ and $D_s(2632)$, which have the surprising properties, are challenging the present models. Many theoretical interpretations have been devoted to this issue. Most of authors suggest that they are not the conventional $c\bar s$ quark model states, but possibly are four-quark states, molecule states or mixtures of a P-wave $c\bar s$ and a four-quark state. In this work, we follow the four-quark-state picture, and study the masses of $cn\bar n\bar s/cs\bar s\bar s$ 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 ($cn\bar n\bar s/cs\bar s\bar s$) with spin parity $J^P=0^{+}$ might not be $D_s(2632)$. At the same time, we also conclude that $D_{sJ}^{*}(2317)$ and $D_{sJ}(2460)$ cannot be explained as the pure four-quark state.
Dai Yuan-Ben
Wang Wei L.
Zhang Hong-Xia
Zhang Zhen-Yu
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