J/psi production at high pT in p+p and A+A collisions at STAR

TL;DR

This paper reports on the measurement of J/psi production at high transverse momentum in proton-proton and copper-copper collisions at 200 GeV, providing insights into suppression patterns and production mechanisms.

Contribution

It presents the first high p_T J/psi spectra in p+p and Cu+Cu collisions at RHIC energies, including nuclear modification factors and correlation studies.

Findings

Nuclear modification factor ~0.9 at p_T>5 GeV/c

J/psi suppression pattern observed in Cu+Cu collisions

Correlation analysis suggests production mechanisms at high p_T

Abstract

The preliminary results of J/psi spectra at high transverse momentum (5<p_T<14 GeV/c) in p+p and Cu+Cu collisions at s_NN = 200 GeV are reported. The nuclear modification factor is measured to be 0.9+/-0.2 at p_T>5 GeV/c. The correlations between J/psi and charged hadrons are also studied in p+p collisions to understand the J/psi production mechanism at high p_T.