Suggesting a di-omega dibaryon search in heavy ion collision experiments

Abstract

The structure of a new dibaryon $(\ensuremath{\Omega}\ensuremath{\Omega}{)}_{{0}^{+}}$ is studied theoretically in the framework of the chiral SU(3) quark model by solving a resonating group method equation. The binding energy of this dibaryon is predicted to be around 100 MeV, the mean-square root of the distance between two \ensuremath{\Omega}'s is 0.84 fm, and the preliminary estimated mean lifetime is about two times that of the free $\ensuremath{\Omega}$'s. All these interesting properties, as well as the two negative charge units it carries, could make it easily identifiable experimentally in the heavy ion collision process. The production probability of this new dibaryon in a 158 GeV $\mathrm{Pb}+\mathrm{Pb}$ collision is estimated using the thermal model. The rate is of the order of ${10}^{\ensuremath{-}6}$ to ${10}^{\ensuremath{-}5}$ per event. It is expected that, with the increase of the temperature, the production rate will also be increased.