Identifying exotic hidden-charm pentaquarks

TL;DR

This paper discusses the interpretation of LHCb's hidden-charm pentaquark states as molecular states within a boson exchange model, explaining their widths and predicting partners for future experimental searches.

Contribution

It provides a molecular state interpretation of the pentaquarks and explains their narrow widths using the boson exchange interaction model, suggesting future experimental searches for partner states.

Findings

Pentaquarks $P_c(4380)$ and $P_c(4450)$ are interpreted as molecular states.

The model explains the narrower width of $P_c(4450)$.

Predictions of partner states for future experiments.

Abstract

The LHCb Collaboration at the Large Hadron Collider at CERN discovered two pentaquark states $P_c(4380)$ and $P_c(4450)$. These two hidden-charm states are interpreted as the loosely bound $\Sigma_c(2455)D^*$ and $\Sigma_c^*(2520)D^*$ molecular states in the boson exchange interaction model, which provides an explanation for why the experimental width of $P_c(4450)$ is much narrower than that of $P_c(4380)$. The discovery of the new resonances $P_c(4380)$ and $P_c(4450)$, indeed, opens a new page for hadron physics. The partners of $P_c(4380)$ and $P_c(4450)$ should be pursued in future experiments.