Speaker
Description
Recently the LHCb collaboration observed five new narrow excited states in the $\bar{K}\Xi_c$ invariant mass spectrum: the $\Omega_c(3000)$, $\Omega_c(3050)$,$\Omega_c(3065)$, $\Omega_c(3090)$ and $\Omega_c(3119)$. Following this discovery, the Belle Collaboration confirmed four of these five narrow states. A popular interpretation is that the observed $\Omega_c^*$ states correspond to the five $\lambda$-mode excited states in the conventional quark model, which are the p-wave excitations between the charm quark and the two light quarks. However, the spin assignment by the quark model does not follow the experimental data.
In this talk, we show that these new states can be explained as superpositions of meson-baryon molecular states and three-quark bare states through a systematic analysis of the low-lying $\Omega_c$ states using a coupled-channel approach [1]. Our results reproduce the mass spectrum well, and our spin assignments are consistent with the LHCb experimental analysis. We also predict one bound state below the $\bar{K}\Xi_c$ threshold, which is expected to be observed in future experiments.
[1] Y. Zhang, Q.-F. Song, Q.-F. Lü, H. Nagahiro, A. Hosaka, PRD112(2025)034035.