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Femtoscopy between $π$, $K$ and $p$ in different heavy-ion collisions at $\sqrt{s_{NN}}$ = 39 GeV

Published 21 Jan 2024 in hep-ph, nucl-ex, and nucl-th | (2401.12257v1)

Abstract: Momentum correlation functions between $\pi$, $K$ and $p$ are calculated for several heavy-ion collision systems, namely ${5}{10}\textrm{B}+{5}{10}\textrm{B}$, ${8}{16}\textrm{O}+{8}{16}\textrm{O}$, ${20}{40}\textrm{Ca}+{20}{40}\textrm{Ca}$ and ${79}{197}\textrm{Au}+{79}{197}\textrm{Au}$ in central collisions as well as ${79}{197}\textrm{Au}+{79}{197}\textrm{Au}$ collision in different centralities at center of mass energy $\sqrt{s_{NN}}$ = 39 GeV within the framework of A Multi-Phase Transport (AMPT) model complemented by the Lednick$\acute{y}$ and Lyuboshitz analytical method. The results present the centrality and system-size dependence of the momentum correlation functions among pairs of $\pi$, $K$ and $p$, from which the emission source-size can be deduced. It is found that the deduced source sizes increase with the decreasing of centrality for Au + Au system or with the increasing of system-size in central collisions with different nuclear size. In addition, through the momentum correlation functions of nonidentical particle pairs gated on velocity, the average emission sequence of non-identical particles can be indicated. The results illustrate that in the small relative momentum region, protons are emitted in average earlier than $\pi+$ and $K+$, and $K+$ are emitted averagely earlier than $\pi+$. Furthermore, it seems that larger interval of the average emission order among them is exhibited for smaller collision systems. The present study sheds light on the dynamics of light particle emission at RHIC energy.

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