From $J/\psi$ to LHCb pentaquark

TL;DR

This paper explores the nature of exotic charmonium-like states and pentaquarks discovered by LHCb, proposing a unified theoretical framework that incorporates higher Fock states into the quark model.

Contribution

It introduces a novel approach to describe exotic hadrons by adding higher Fock state components to the naive quark model, providing insights into recent LHCb discoveries.

Findings

Theoretical results on pentaquark states $P_{c}(4380)^{+}$ and $P_{c}(4450)^{+}$.

Analysis of charmonium-like resonances $X(4140)$, $X(4274)$, $X(4500)$, and $X(4700)$.

A unified description of exotic states using higher Fock states.

Abstract

The original charmonium two-body problem, like the $c\bar c$ structure of the $J/\psi$ meson, has become more involved in the last few years with the discovery of new resonances such as the tentative molecular state $X(3872)$ or the possible pentaquark one $P_{c}(4380)^{+}$. We discuss herein how these exotic states (and others) can be described in a unified way adding higher Fock state components to the naive quark model picture. In particular, we present our theoretical results on the pentaquark states $P_{c}(4380)^{+}$ and $P_{c}(4450)^{+}$, and on the new charmonium-like resonances $X(4140)$, $X(4274)$, $X(4500)$ and $X(4700)$ that have been reported in $2016$ by the LHCb Collaboration.