Can Tsallis distribution fit all the particle spectra produced at RHIC and LHC?

TL;DR

This study evaluates the effectiveness of the Tsallis distribution in fitting particle spectra from various high-energy collisions at RHIC and LHC, proposing an improved formula for better fits at high transverse momentum.

Contribution

The paper demonstrates the applicability of the Tsallis distribution across multiple collision systems and introduces a new formula to fit the entire high-$p_T$ region in Pb+Pb collisions.

Findings

Tsallis distribution fits most spectra except in some cases at low $p_T$.

Deviations observed for protons and $\\Lambda$ in Au+Au collisions.

Proposed new formula improves fit for high $p_T$ spectra.

Abstract

The Tsallis distribution has been tested to fit the all particle spectra at mid-rapidity from central events produced in d+Au, Cu+Cu, Au+Au collisions at RHIC and p+Pb, Pb+Pb collisions at LHC. Even though there are strong medium effects in Cu+Cu and Au+Au collisions, the results show that the Tsallis distribution can be used to fit most of particle spectra in the collisions studied except in Au+Au collisions where some deviations are seen for proton and $\Lambda$ at low $p_T$. In addition, as the Tsallis distribution can only fit part of the particle spectra produced in Pb+Pb collisions where $p_T$ is up to 20 GeV/c, a new formula with one more fitting degree of freedom is proposed in order to reproduce the entire $p_T$ region.