Dynamical study of Tₒₒ systems at a chiral quark model

Abstract Since the discovery of T cc by LHCb, there has been considerable interest in T cc and its heavy-flavor partners. However, the study of its strange partner T ss has been largely overlooked. Within the framework of the chiral quark model, we conducted a systematic study of the bound states of T ss based on the Gaussian Expansion Method. We considered all physical channels with 01 + , including molecular and diquark structures. Moreover, by considering the coupling between diquarks and molecular states, our calculations allowed us to identify a deep bound state with a bounding energy of 60 MeV primarily composed of KK * . Using the 3 P 0 model, we calculated the decay width of K * within the KK * bound state, which is approximated as the decay width of the bound state in the T ss system. These results indicate that, owing to the effect of binding energy, the decay width of K * in KK * is approximately 3 MeV smaller than that of K * in vacuum. Additionally, resonance state calculations were performed. We used the real-scaling method to search for possible resonance states in the T ss sysytem. Because of the strong attraction in the K * 8 K * 8 configuration, four resonance states were found in the vicinity of 2.2−2.8 GeV, predominantly featuring hidden-color structures. The decay widths of these states are less than 10 MeV. We strongly recommend experimental efforts to search for the resonance states in the T ss system predicted by our calculations.