High pT correlations with strange particles in STAR

TL;DR

This paper analyzes strange particle correlations in high-energy collisions, revealing species-independent jet and ridge yields, and comparing baryon-to-meson ratios across different regions to inform jet quenching theories.

Contribution

It provides new detailed measurements of strange particle correlations and ratios, enhancing understanding of jet-medium interactions in heavy-ion collisions.

Findings

Azimuthal peaks are similar for all strange baryons and K0-short mesons.

No species dependence on same-side jet or ridge yields as a function of pT.

Lambda to K0-short ratio varies between jet and bulk regions.

Abstract

We present the highlights of the current identified strange particles DeltaPhi and DeltaEta correlations analyses, including system-size and trigger-pT of the jet and ridge, jet, ridge and away-side meson/baryon ratios, and the current state of the multi-strange baryon analysis. We see clear azimuthal peaks of comparable strength for all strange baryons and K0-short mesons. We see no observable species dependence on the same-side jet or ridge yields as a function of pT. However, while the away side and the ridge have Lambda to K0-short ratio similar to that of the bulk, the jet-only ratio is similar to that in $p+p$. The implications of these findings on current in-medium jet theoretical explanations are discussed.