Blast Wave Fits to Elliptic Flow Data at $\sqrt{s_{\rm NN}} =$ 7.7--2760 GeV

TL;DR

This paper applies blast wave models to elliptic flow data across a wide energy range from RHIC and LHC, revealing energy-dependent differences between particles and anti-particles, and discusses underlying physical effects.

Contribution

It provides detailed blast wave fits to elliptic flow data at various energies, highlighting differences between particles and anti-particles and exploring potential physical causes.

Findings

Energy-dependent difference in transverse velocity between particles and anti-particles

Anti-particle effects increase as beam energy decreases

Discussion of feed down, baryon stopping, and early production effects

Abstract

We present blast wave fits to elliptic flow ($v_{2}(p_{\rm T})$) data in minimum bias collisions from the $\sqrt{s_{\rm NN}} =$ 7.7--200 GeV at RHIC, and 2.76 TeV at LHC. The fits are performed separately for particles and corresponding anti-particles. The mean transverse velocity parameter $\beta$ shows an energy dependent difference between particles and corresponding anti-particles, which increases as the beam energy decreases. Possible effects of feed down, baryon stopping, anti-particle absorption, and early production times for anti-particles are discussed.