HBT radii : Comparative studies on collision systems and beam energies

TL;DR

This paper compares HBT radii across different collision systems and energies to understand the space-time structure of particle emission sources in high energy heavy ion collisions, revealing similarities that bridge SPS and RHIC energy regimes.

Contribution

It provides a comparative analysis of HBT radii in various collision systems and energies, highlighting consistent ratios that connect different energy regimes.

Findings

Similar $R_{out}/R_{side}$ ratios across systems and energies

Bridging SPS and RHIC energy regimes

Insights into space-time emission source structures

Abstract

Two-particle Hanbury-Brown-Twiss (HBT) interferometry is an important probe for understanding the space-time structure of particle emission sources in high energy heavy ion collisions. We present the comparative studies of HBT radii in Pb+Pb collisions at $\sqrt{s_{\rm{NN}}}$ = 17.3 GeV with Au+Au collisions at $\sqrt{s_{\rm{NN}}}$ = 19.6 GeV. To further our understanding for this specific energy regime we also compare the HBT radii for Au+Au collisions at $\sqrt{s_{\rm{NN}}}$ = 19.6 GeV with Cu+Cu collisions at $\sqrt{s_{\rm{NN}}}$ = 22.4 GeV. We have found interesting similarity in the $R_{\rm out}/R_{\rm side}$ ratio with $m_{\rm T}$ across the collision systems while comparing the data for this specific energy zone which is interesting as it acts as a bridge from SPS energy regime to the RHIC energy domain.