Possible dibaryons with strangeness s=-5

In the framework of the resonating group method, 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 Ξ^*Ω channel calculation with spins S=0 and 3 and the coupled ΞΩ and Ξ^*Ω channel calculation with spins S=1 and 2 are considered, respectively. The results show the following observations. In the spin=0 case, Ξ^*Ω may be a bound dibaryon with the binding energy being 80.0∼92.4 MeV. In the S=1 case, ΞΩ may also be a bound dibaryon. Its binding energy ranges from 26.2 to 32.9 MeV. In the S=2 and S=3 cases, no evidence of bound dibaryons is found. The scattering lengths in the S=0 and S=1 cases are also given.