Pseudorapidity distributions of charged particles in asymmetric collisions using Tsallis thermodynamics

The pseudo-rapidity distributions of the charged particles produced in the asymmetric collision systems p+Al, p+Au and $^3$He+Au at $ sqrt{s_{NN}} = 200$ GeV are evaluated in the framework of a fireball model with Tsallis thermodynamics. The fireball model assumes that the experimentally measured particles are produced by fireballs following the Tsallis distribution and it can effectively describe the experimental data. Our results as well as previous results for d+Au collisions at $ sqrt{s_{NN}} = 200$ GeV and p+Pb collisions at $ sqrt{s_{NN}} = 5.02$ TeV validate that the fireball model based on Tsallis thermodynamics can provide a universal framework for pseudo-rapidity distribution of the charged particles produced in asymmetric collision systems. We predict the centrality dependence of the total charged particle multiplicity in the p+Al, p+Au and $^3$He+Au collisions. Additionally, the dependences of the fireball model parameters ($y_{0a}$, $y_{0A}$, $ sigma_{a}$ and $ sigma_{A}$) on the centrality and system size are studied.