Hadronic molecular assignment for the newly observed ${\Omega }^{\ast }$ state

Abstract

Very recently, a new ${\Omega }^{\ast }$ state was reported by the Belle Collaboration, with its mass of $2012.4\pm 0.7\text{(stat)}\pm 0.6\text{(syst)}\mathrm{MeV}$, which locates just below the $K{\Xi }^{\ast }$ threshold and hence hints to be a possible $K{\Xi }^{\ast }$ hadronic molecule. Using the effective Lagrangian approach as the same as our previous works for other possible hadronic molecular states, we investigate the decay behavior of this new ${\Omega }^{\ast }$ state within the hadronic molecular picture. The results show that the measured decay width can be reproduced well and its dominant decay channel is predicted to be the $K\pi \Xi$ three-body decay. This suggests that the newly observed ${\Omega }^{\ast }$ may be ascribed as the $J^P={3/2}^{-}$ $K{\Xi }^{\ast }$ hadronic molecular state and can be further checked through its $K\pi \Xi$ decay channel.

Comments: 7pages, 6 figures