Excitation functions of parameters in Erlang distribution, Schwinger mechanism, and Tsallis statistics in RHIC BES program

TL;DR

This paper analyzes transverse momentum distributions in RHIC BES gold-gold collisions using Erlang, Schwinger, and Tsallis models, revealing excitation functions and a softest point at 7.7 GeV.

Contribution

It introduces a comprehensive analysis of excitation functions of parameters in Erlang, Schwinger, and Tsallis models applied to RHIC BES data, highlighting a softest point in string tension.

Findings

Weak softest point in string tension at 7.7 GeV for Omega hyperons.

Parameters in Erlang, Schwinger, and Tsallis models show excitation functions.

Models effectively describe transverse momentum distributions across energies.

Abstract

Experimental results of the transverse momentum distributions of phi mesons and $\Omega$ hyperons produced in gold-gold (Au-Au) collisions with different centrality intervals, measured by the STAR Collaboration at different energies (7.7, 11.5, 19.6, 27, and 39 GeV) in the beam energy scan (BES) program at the relativistic heavy ion collider (RHIC), are approximately described by the single Erlang distribution and the two-component Schwinger mechanism. Meanwhile, the STAR experimental transverse momentum distributions of negatively charged particles, produced in Au-Au collisions at RHIC BES energies, are approximately described by the two-component Erlang distribution and the single Tsallis statistics. The excitation functions of free parameters are obtained from the fit to the experimental data. A weak softest point in the string tension in $\Omega$ hyperon spectra is observed at 7.7 GeV.