Particle Ratios on the Near and Away-Side of Jets at RHIC

TL;DR

This study investigates the relative abundances of strange particles associated with high-momentum triggers in gold-gold collisions at RHIC, aiming to understand jet-medium interactions and correlation modifications.

Contribution

It provides new measurements of particle ratios on near and away sides of jets, exploring their angular dependence in heavy-ion collisions at RHIC.

Findings

Particle ratios vary with azimuthal angle relative to the trigger.

Results suggest modifications in jet fragmentation due to medium interactions.

Data may help distinguish between different models of parton-medium interactions.

Abstract

We measure the relative abundances of strange mesons, baryons, and anti-baryons correlated with high-$p_T$ trigger particles in $^{197}$Au + $^{197}$Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. Particle yields and ratios are extracted on the near-side and away-side of the trigger particle. The associate-particle ratios are studied as a function of the angle relative to the trigger particle azimuth $\Delta\phi$. Such studies should help elucidate the origin of the previously observed correlations and their strong modifications in Au+Au collisions relative to p+p collisions. We discuss how these measurements might be related to several scenarios for interactions of fast partons with the medium in Au+Au collision.