Possible Dibaryons with Strangeness s=-5

Abstract

In the framework of $RGM$, the binding energy of the six quark system with strangeness s=-5 is systematically investigated under the SU(3) chiral constituent quark model. The single ${\Xi }^{\ast }\Omega$ channel calculation with spins S=0 and 3 and the coupled $\Xi \Omega$ and ${\Xi }^{\ast }\Omega$ channel calculation with spins S=1 and 2 are considered, respectively. The results show following observations: In the spin=0 case, ${\Xi }^{\ast }\Omega$ is a bound dibaryon with the binding energy being $80.0\sim 92.4MeV$. In the S=1 case, $\Xi \Omega$ is also a bound dibaryon. Its binding energy is ranged from $26.2MeV$ to $32.9MeV$. In the S=2 and S=3 cases, no evidence of bound dibaryons are found. The phase shifts and scattering lengths in the S=0 and S=1 cases are also given.

Comments: 10 pages, latex