Resolution of hyper-triton chemical freeze-out puzzle in high energy nuclear collisions

TL;DR

This paper uses an advanced hadron resonance gas model with multicomponent hard-core repulsion to accurately describe light nuclear cluster data, including hyper-triton, resolving a longstanding chemical freeze-out puzzle in high-energy nuclear collisions.

Contribution

It introduces a new analysis strategy and applies specific hyperon hard-core radii to successfully reproduce experimental hyper-triton data and related ratios.

Findings

Accurate description of hyper-triton and light nuclear cluster multiplicities.

Simultaneous reproduction of experimental ratios S_3 and ar{S}_3.

Resolution of the hyper-triton chemical freeze-out puzzle.

Abstract

The recently developed hadron resonance gas model with multicomponent hard-core repulsion is used to address and resolve the long standing problem to describe the light nuclear cluster multiplicities including the hyper-triton measured by the STAR Collaboration, known as the hyper-triton chemical freeze-out puzzle. An unprecedentedly accurate description is obtained for the hadronic and other light nuclear cluster data measured by STAR at the collision energy $\sqrt{s_{NN}} =200$ GeV and by ALICE at $\sqrt{s_{NN}} =2.76$ TeV. This success is achieved by applying the new strategy of analyzing the light nuclear cluster data and by using the value for the hard-core radius of the (anti-)$\Lambda$ hyperons found in earlier work. One of the most striking results of the present work is that for the most probable scenario of chemical freeze-out for the STAR energy the obtained parameters allow to simultaneously reproduce the values of the experimental ratios $S_3$ and $\bar{S}_3$ which were not included in the fit.