Hidden-charm Pentaquark States in Heavy Ion Collisions at the Large Hadron Collider

TL;DR

This paper develops a quark combination model to predict the production yields and ratios of hidden-charm pentaquark states in heavy ion collisions at the LHC, providing insights into their formation mechanisms.

Contribution

It introduces a specific quark combination framework to evaluate yields of exotic pentaquarks based on normal hadron yields in ultra-relativistic collisions.

Findings

Predicted yield ratios of hidden-charm pentaquarks.

Calculated yields of $P_c^+(4380)$ and $P_c^+(4450)$ in Pb+Pb collisions.

Demonstrated the model's applicability to LHC collision data.

Abstract

In the framework of the quark combination, we derive the yield formulas and study the yield ratios of the hidden-charm pentaquark states in ultra-relativistic heavy ion collisions. We propose some interesting yield ratios which clearly exhibit the production relationships between different hidden-charm pentaquark states. We show how to employ a specific quark combination model to evaluate the yields of exotic $P_c^+(4380)$, $P_c^+(4450)$ and their partners on the basis of reproducing the yields of normal identified hadrons, and execute the calculations in central Pb+Pb collisions at $\sqrt{s_{NN}}= 2.76$ TeV as an example.