System size and Multiplicity dependence of Chemical freeze-out parameters at the Large Hadron Collider Energies

Abstract

The collision system and multiplicity dependence of chemical freeze-out temperature ($T_{\mathrm{ch}}$) and strangeness saturation factor (${\gamma }_s$) are obtained by studying the particle ratios at the Large Hadron Collider (LHC) energies. Here, we consider the new results in pp at 13 TeV, p+Pb at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV, Xe+Xe at $\sqrt{s_{\mathrm{NN}}}$ = 5.44 TeV and Pb+Pb at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV along with the earlier results in pp at $\sqrt{s}$ = 7 TeV and Pb+Pb at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV. A statistical thermal model is used to extract the chemical freeze-out parameters in different multiplicity classes. To understand the particle production from small to large collision systems two ensembles namely, canonical and grand canonical have been considered in this study. A clear observation of multiplicity dependence of $T_{\mathrm{ch}}$ and ${\gamma }_s$ is observed. The values obtained in high-multiplicity pp collisions are found to be similar to the peripheral Pb+Pb collisions. A final state midrapidity charged particle multiplicity density of around 20-30 appears to be a threshold below which, the chemical freeze-out temperature is lower than the kinetic freeze-out temperature.

Comments: 8 pages and 8 figures. This version includes additionally, a comparison between chemical and kinetic freeze-out temperatures