Hongxia Huang

In this work, we investigate the interaction between the Ω baryon and the s s ¯ meson within the framework of the quark delocalization color-screening model. The spectra calculations show that no bound state is formed in any of the considered channels, while the scattering indicates that the Ω ϕ interaction with J P = 1 / 2 − is weakly attractive. As for the Ω ϕ interactions with J P = 3 / 2 − and 5 / 2 − , as well as the Ω η ′ interaction with J P = 3 / 2 − , they are all repulsive. After an investigation on the femtoscopic correlation functions, we find that, due to the spin-averaging effect, the overall Ω ϕ correlation function exhibits a weak dependence on the source size, which provides a crucial significance of our model for future experimental examinations in relativistic heavy-ion collisions.

We perform a systematical investigation of the existence of the deuteronlike singly bottomed dibaryon resonance states with strangeness S = − 1 , − 3 , − 5 in the chiral quark model. Two resonance states with strangeness S = − 1 are obtained in the baryon-baryon scattering process. The first candidate is Σ Σ b in the Λ Λ b and N Ξ b * scattering process, with the resonance energy 6974.22–6975.37 MeV and the decay width 14.450 MeV, respectively; the other one is Σ Σ b * in the N Ξ b and N Ξ b ′ scattering process, with the resonance energy 6990.69–7008.37 MeV and the decay width 43.790 MeV, respectively. The calculation of the distance between the center of mass of the two baryons shows that both Σ Σ b and Σ Σ b * can be appropriately described as the deuteronlike dibaryons. Both of these resonance states are worthy of experimental exploration. Furthermore, it should be emphasized that the effect of channel coupling is of great importance in exploring exotic hadron states, and investigating the scattering process may serve as an effective approach to identifying genuine resonances.

Motivated by the LHCb Collaboration's observation of the doubly charmed tetraquark state T c c ( 3875 ) , we systematically explore the potential existence of doubly charmed pentaquark states using the resonating group method within the quark delocalization color screening model framework. The effective potential of the two involved hadrons and the bound-state dynamics are included in the present work. Moreover, we have also calculated the scattering phase shifts of open channels with channel coupling, aiming to identify possible resonance states. Our estimations suggest that the existence of a bound state with quantum numbers I ( J P ) = 3 2 ( 5 2 − ) and a mass of approximately 4461.7 MeV. Furthermore, five resonance states are predicted through coupled-channels analysis, which are Ξ c c ρ and Σ c D * with I ( J P ) = 1 2 ( 1 2 − ) , Λ c D * and Σ c * D * with I ( J P ) = 1 2 ( 3 2 − ) , and Σ c D * with I ( J P ) = 3 2 ( 1 2 − ) , respectively. The existence of these predicted doubly charmed pentaquark states needs to be supported by experimental measurements and discoveries. We hope future experiments will provide evidence for these states.

In this Letter, we propose that a proper constituent gluon mass m g = 450 MeV can be applied to identify the hybrids composed of quarks and gluons. By investigating the spectra and decay widths of the light hybrids ( q q ¯ g ) with J P = 1 − + , we find the π 1 ( 1600 ) and η 1 ( 1855 ) may not be explained as 1 − + hybrids, simultaneously, and the η 1 ( 1855 ) observed by BESIII may not be a hybrid. In addition, we predict an existence of a hybrid η 1 ( 1640 ) , which can be verified by searching the a 1 ( 1260 ) π channel. Moreover, we suggest the K 1 ( 1270 ) K ¯ and K 1 ( 1270 ) π as the golden channels to search for isospin-0 and isospin- 1 2 hybrids, respectively.