Dibaryon systems in chiral SU(3) quark model

The possible candidates of S-wave dibaryons with various strange numbers ar e studied under the chiral SU(3) quark model. It is shown that there are th ree types of baryon-baryon bound states. The states of the first type are c alled deuteron-like states. If chiral fields can provide enough attraction between interacting baryons, these systems, such as [Xi Omega - Xi*Omega](( 1,1/2)), [Xi Xi]((0,1)), [N Omega]((2,1/2)) would be weakly bound. The stat es of the second type such as [Sigma*Delta]((0,5/2)), [Sigma*Delta]((3,1/2) ), [Delta Delta](0,3) and [Delta Delta]((3,0)) are named as Delta Delta -li ke states. Due to the highly symmetric character in orbital space, these sy stems could be relatively deeply bound, but the strong decay modes of compo sed baryons cause the widths of the states much broader. The states of the third type are entitled as Omega Omega -like states. Due to the same symmet ry character shown in the systems of the second type and the only weak deca y mode of composed baryons, for instance in [Omega Omega](0,0), or at most one strong decay mode of composed baryons, for example in [Xi*Omega]((0,1/2 )), these states are deeply bound states with narrow widths. The states of latter two types are most interesting new dibaryon states and should be car efully investigated both theoretically and experimentally. (C) 2001 Elsevie r Science B,V. All rights reserved.