Investigating excited $\Omega_c$ states from pentaquark perspective

TL;DR

This study interprets certain excited $ ext{Ω}_c$ states as molecular pentaquark states using the quark delocalization color screening model, predicting new states and discussing the limitations of the pentaquark explanation.

Contribution

It provides a pentaquark-based interpretation of recent $ ext{Ω}_c$ states and predicts a new molecular state, highlighting the limitations of the pentaquark framework for some states.

Findings

$ ext{Ω}_c(3185)$ as a $ ext{Ξ}D$ resonance with $J^P=1/2^-$

$ ext{Ω}_c(3120)$ as a $ ext{Ξ}_c^* ar{ ext{K}}$ state with $J^P=3/2^-$

Prediction of a new $ ext{Ξ}_c^* ar{ ext{K}}^*$ state with $J^P=5/2^-$ at 3527 MeV

Abstract

Inspired by the recent observation of new $\Omega_c^0$ states by the LHCb Collaboration, we explore the excited $\Omega_{c}$ states from the pentaquark perspective in the quark delocalization color screening model. Our results indicate that the $\Omega_c(3185)$ can be well interpreted as a molecular $\Xi D$ predominated resonance state with $J^P=1/2^-$. The $\Omega_c(3120)$ can also be interpreted as a molecular $\Xi_c^* \bar{K}$ state with $J^P=3/2^-$ and a new molecular state $\Xi^*_c \bar{K}^*$ with $J^P=5/2^-$ and a mass of 3527 MeV is predicted, which is worth searching in the future. Other reported $\Omega_c$ states cannot be well described in the framework of pentaquark systems in present work. The three-quark excited state, or the unquenched picture may be a good explanation, which is worth further exploration.