# J/psi production in Au+Au and Cu+Cu collisions at sqrt(sNN) = 200 GeV at STAR

## TL;DR

This paper reports on the measurement of J/psi production in Au+Au and Cu+Cu collisions at 200 GeV at STAR, analyzing nuclear modification factors to understand quark-gluon plasma properties.

## Contribution

It provides new experimental data on J/psi production at RHIC energies and compares results across different collision systems and theoretical models.

## Key findings

- J/psi suppression varies with centrality and transverse momentum.
- Results are consistent with quark-gluon plasma formation effects.
- Data compared to theoretical models to interpret suppression mechanisms.

## Abstract

J/psi production is considered to be a sensitive probe of the properties of quark gluon plasma created in nucleus+nucleus collisions at RHIC. In this article, the recent analysis of mid-rapidity (|y| < 1) J/psi production via the dielectron decay channel in Au+Au (year 2007) and Cu+Cu (year 2005) collisions at sqrt(sNN) = 200 GeV at STAR is reported. It is compared to STAR p+p results in order to study the nuclear modification factor as a function of transverse momentum and centrality. The results are compared to previously published data and available theoretical models.