J/psi production at high pT at STAR

TL;DR

This paper presents measurements of J/psi production and its correlations with hadrons in high-energy proton-proton and gold-gold collisions at RHIC, revealing insights into B-hadron feed-down contributions and J/psi behavior at different energies.

Contribution

It provides the first detailed analysis of J/psi-hadron correlations and B-hadron feed-down contributions at RHIC energies, extending understanding to lower collision energies.

Findings

B-hadron feed-down contributes 10-25% to J/psi yield in 4-12 GeV/c p_T range

J/psi-hadron correlation spectra are consistent across RHIC and LHC energies

J/psi signals are observed in 39 GeV Au+Au collisions, demonstrating STAR's capabilities

Abstract

We report results on J/psi-hadron azimuthal angular correlations in 200 GeV p+p collision in the STAR experiment at RHIC. The extracted B-hadron feed-down contribution to inclusive J/psi yield is found to be 10-25% in 4<p_T<12 GeV/c and has no significant center-of-mass energy dependence from RHIC to LHC. The p_T spectrum of charged hadron associated with high-p_T J/psi triggers on the away side is found to be consistent with that from di-hadron correlations. J/psi signal from partially produced Au+Au 39 GeV data will also be presented to demonstrate STAR's J/psi capability at RHIC low energy run.