Probing hidden-charm decay properties of Pc states in a molecular scenario

Abstract

The Pc(4312), Pc(4440), and Pc(4457) observed by the LHCb collaboration are very likely to be S-wave ςcD¯(∗) molecular candidates due to their near threshold character. In this work, we study the hidden-charm decay modes of these Pc states, Pc→J/ψp(ηcp), using a quark interchange model. The decay mechanism for the Pc→J/ψp(ηcp) processes arises from the quark-quark interactions, where all parameters are determined by the mass spectra of mesons. We present our results in two scenarios. In scenario I, we perform the dynamical calculations and treat the Pc states as pure ςcD¯(∗) molecules. In scenario II, after considering the coupled channel effect between different flavor configurations ςc(∗)D¯(∗), we calculate these partial decay widths again. The decay patterns in these two scenarios can help us to explore the molecular assignment and the inner flavor configurations for the Pc states. In particular, the decay widths of Γ(Pc(4312)→ηcp) are comparable to the J/ψp decay widths in both of these two scenarios. Future experiments like LHCb may confirm the existence of the Pc(4312) in the ηcp channel.