$\Lambda$ - anomaly in the hadron chemical freeze-out

TL;DR

This paper introduces a modified hadron resonance gas model incorporating an additional radius for the $\\Lambda$ hyperon to address the $\\Lambda$-anomaly, successfully fitting experimental multiplicity ratios across multiple collider energies.

Contribution

The paper proposes a novel modification to the hadron resonance gas model by adding a radius parameter for the $\\Lambda$ hyperon, effectively resolving the $\\Lambda$-anomaly.

Findings

Successfully describes multiplicity ratios at AGS, SPS, and RHIC energies.

Achieves a good fit with $\\chi^2/dof$ close to 1.

Addresses the $\\Lambda$-anomaly in hadron production models.

Abstract

A new way to overcome the $\Lambda$ hyperon selective suppression, which is known as the $\Lambda$-anomaly, has been suggested. In particular, the additional radius of a $\Lambda$ hyperon is introduced into the model of hadron resonance gas with the multicomponent hard-core repulsion. The proposed approach allows one to describe the hadron multiplicity ratios measured at the AGS, SPS and RHIC energies with the accuracy $\chi^{2}/dof=$52/55$\simeq $0.95.