Eur. Phys. J. C (2009) 61: 687-691
https://doi.org/10.1140/epjc/s10052-009-1018-y

Regular Article - Experimental Physics

Quarkonia measurements with STAR

Physics Department, Brookhaven National Laboratory, Upton, NY, 11973, USA

^* e-mail: thomas.ullrich@bnl.gov

Received: 12 September 2008
Revised: 4 March 2009
Published online: 27 March 2009

Abstract

We report results on quarkonium production from the STAR experiment at the Relativistic Heavy-Ion Collider (RHIC). J/ψ spectra in p+p and Cu+Cu collisions at  GeV with transverse momenta in the range of 0.5–14 GeV/c and 5–8 GeV/c, respectively, are presented. We find that for p _T >5 GeV/c yields in p+p collisions are consistent with those in minimum-bias Cu+Cu collisions scaled with the respective number of binary nucleon-nucleon collisions. In this range the nuclear modification factor, R _AA , is measured to be 0.9±0.2 (stat). For the first time at RHIC, high-p _T J/ψ-hadron correlations were studied in p+p collisions. Implications from our measurements on J/ψ production mechanisms, constraints on open bottom yields, and J/ψ dissociation mechanisms at high-p _T are discussed. In addition, we give a brief status of measurements of ϒ production in p+p and Au+Au collisions and present projections of future quarkonia measurements based on an upgrades to the STAR detector and increased luminosity achieved through stochastic cooling of RHIC.