Di-Hadron Correlations with Identified Leading Hadrons in 200 GeV Au+Au and d+Au Collisions at STAR

TL;DR

This study investigates di-hadron correlations with identified leading hadrons in 200 GeV Au+Au and d+Au collisions, revealing differences in jet-like yields and ridge phenomena that shed light on hadronization in the quark-gluon plasma.

Contribution

It provides the first two-dimensional di-hadron correlation measurements with identified leading hadrons in these collision systems, testing various hadronization models.

Findings

Enhanced jet-like yield for leading pions in Au+Au compared to d+Au.

No enhancement for leading non-pions (protons and kaons).

Higher correlated yield at large angles for leading non-pions.

Abstract

The STAR collaboration presents for the first time two-dimensional di-hadron correlations with identified leading hadrons in 200 GeV central Au+Au and minimum-bias d+Au collisions to explore hadronization mechanisms in the quark gluon plasma. The enhancement of the jet-like yield for leading pions in Au+Au data with respect to the d+Au reference and the absence of such an enhancement for leading non-pions (protons and kaons) are discussed within the context of a quark recombination scenario. The correlated yield at large angles, specifically in the \emph{ridge region}, is found to be significantly higher for leading non-pions than pions. The consistencies of the constituent quark scaling, azimuthal harmonic model and a mini-jet modification model description of the data are tested, providing further constraints on hadronization.