Quarkonium Production at STAR
Abstract
We report the results on heavy quarkonium production in p+p and Au+Au collisions at midrapidity via the dielectron decay channel at sqrt(sNN) = 200 GeV from the STAR experiment at RHIC. Results on the J/psi pT spectra in p+p collisions are presented for 2 < pT < 10 GeV/c. The B-meson feed-down contribution to the inclusive J/psi yield has been obtained using the J/psi-hadron azimuthal angular correlation in p+p collisions, and is found to be 10-25% in the range 4 < pT < 12 GeV/c. The pT spectrum and nuclear modification factor for J/psi with pT < 10 GeV/c is reported, along with results from Upsilon(1S+2S+3S) production in Au+Au collisions. The nuclear modification factor for high-pT J/psi (pT > 5 GeV/c) is found to be consistent with unity in peripheral collisions, while a significant suppression of low-pT J/psi and Upsilon is observed in central collisions. The elliptic flow of J/psi is reported for 20-60% central Au+Au collisions, and is found to be consistent with zero.