Baryon to Meson Ratios on the Near and Away-Side of Jets and their Centrality Dependence at STAR

TL;DR

This study investigates the ratios of baryons to mesons near and away from jets in gold-gold collisions at high energy, revealing how these ratios depend on collision centrality and azimuthal angle, to understand jet modifications and medium interactions.

Contribution

It provides new measurements of identified particle ratios on near and away sides of jets as a function of centrality and azimuthal angle in heavy-ion collisions.

Findings

Particle ratios vary with azimuthal angle and centrality.

Modifications in jet-like correlations are linked to medium effects.

Results suggest different interaction mechanisms of partons with the medium.

Abstract

We measure relative abundances of $K_{S}^{0}$, $\Lambda$ and $\bar{\Lambda}$ in near-side and away-side cones correlated with triggered high-$p_{T}$ particles in $^{197}$Au + $^{197}$Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. The centrality dependence of identified particles in the triggered particle cones is also presented. 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 modifications in the jet like correlations observed in Au+Au collisions relative to p+p collisions. And these studies also will help understand the variation of local parton densities at the away side. We discuss how these measurements might be related to several scenarios for interactions of fast partons with the medium created in Au+Au collision.