Updated analysis of charmonium states in a relativized quark potential model

Abstract

Motivated by recent experimental observations of charmonium(-like) states, we investigate their interpretation as conventional charmonium states within the framework of relativized quark potential model. We find a consistent description of the updated masses of charmonia, bottomonia and some selected charmed mesons, then systematically compute open-charm strong decay widths and electromagnetic transition widths for radially excited charmonium states up to $n=5$. The numerical results show significantly improved agreement with experimental masses and widths. Notably, the newly-observed $\chi_{c1}(4010)$ and $\chi_{c1}(4274)$ are tentatively associated with the $\chi_{c1}(2P)$ and $\chi_{c1}(3P)$ respectively, while the $\chi_{c0}(4500)$ and $\chi_{c0}(4700)$ are interpreted as the $\chi_{c0}(4P)$ and $\chi_{c0}(5P)$ states. For the controversial $\chi_{c1}(3872)$ state, we suggest its potential connection to $\chi_{c1}(4010)$, as a two-pole structure due to the $\chi_{c1}(2P)$ coupling to $D\bar{D}$ channels. Intriguingly, the predicted mass of $\chi_{c0}(2P)$ is about 3851 MeV, diverging from the original estimate of 3916 MeV in the Godfrey and Isgur's work but consistent with non-relativistic potential model predictions. This calculation might provide more insight to the future experimental investigation of charmonium(-like) states.