Exotic hadrons and hadron-hadron interactions in heavy ion collisions

TL;DR

This paper explores the production and interaction of exotic hadrons in heavy ion collisions, highlighting differences between models and constraining Lambda-Lambda interactions using recent experimental data.

Contribution

It compares coalescence and statistical models for hadron production and constrains Lambda-Lambda interaction parameters based on correlation measurements.

Findings

Large spatial size hadronic molecules are more abundantly produced in the coalescence model.

RHIC-STAR data favor Lambda-Lambda scattering parameters with 1/a_0 <= -0.8 fm^{-1} and r_{eff} >= 3 fm.

The study provides new insights into hadron-hadron interactions in heavy ion collisions.

Abstract

We discuss the exotic hadron structure and hadron-hadron interactions in view of heavy ion collisions. First, we demonstrate that a hadronic molecule with a large spatial size would be produced more abundantly in the coalescence model compared with the statistical model result. Secondly, we constrain the Lambda-Lambda interaction by using the recently measured Lambda-Lambda correlation data. We find that the RHIC-STAR data favor the Lambda-Lambda scattering parameters in the range 1/a_0 <= -0.8 fm^{-1} and r_{eff} >= 3 fm.