Beam Energy Dependence of Clan Multiplicity at RHIC

TL;DR

This study measures clan multiplicity in gold-gold collisions at various energies at RHIC, revealing energy and centrality dependence, with a notable minimum around 27 GeV, providing insights into particle production mechanisms.

Contribution

First measurement of clan multiplicity across multiple energies and centralities at RHIC, highlighting energy-dependent behavior in heavy-ion collisions.

Findings

Mean particles per clan decrease with decreasing centrality.

Reduction in particles per clan between 19.6 and 62 GeV, minimum near 27 GeV.

Structure most prominent in central collisions.

Abstract

In this paper, STAR's measurement of clan multiplicity is presented for AuAu collisions at $\sqrt{s_\mathrm{NN}}$ = 7.7, 11.5, 19.6, 27, 39, 62.4 and 200 GeV, for a variety of centrality classes. The mean number of particles per clan is found to decrease with decreasing centrality. Within the same centrality class, the mean number of particles per clan exhibits a reduction between 19.6 GeV and 62 GeV, with the minimum around 27 GeV. The structure is visible for most centralities, and most prominent for central collisions.