J/psi Production vs Centrality, Transverse Momentum, and Rapidity in Au+Au Collisions at sqrt(s_NN) = 200 GeV

Abstract

The PHENIX experiment at the Relativistic Heavy Ion Collider (RHIC) has measured J/psi production for rapidities 2.2 < y < 2.2 in Au+Au collisions at sqrt(s_NN) = 200 GeV. The J/psi invariant yield and nuclear modification factor R_AA as a function of centrality, transverse momentum and rapidity are reported. A suppression of J/psi relative to binary collision scaling of proton-proton reaction yields is observed. Models which describe the lower energy J/Psi data at the Super Proton Synchrotron (SPS) invoking only J/psi destruction based on the local medium density would predict a significantly larger suppression at RHIC and more suppression at mid rapidity than at forward rapidity. Both trends are contradicted by our data.

Figures (5)

• Figure 1: $J/\psi$ invariant yield vs. ${p_{\rm T}}$ for different centrality bins in ${\rm Au+Au}$ collisions and in ${p+p}$ collisions Adare:2007ph. The left (right) panel corresponds to mid (forward) rapidity. See text for description of the errors.
• Figure 2: $J/\psi$ invariant yield vs. $y$ for different centrality bins in ${\rm Au+Au}$ collisions and for ${p+p}$ collisions. Open (filled) circles are for mid (forward) rapidity ${\rm Au+Au}$ data. Black squares are for ${p+p}$ data Adare:2007ph. See text for description of the errors.
• Figure 3: $J/\psi$$R_{\rm AA}$ vs. ${p_{\rm T}}$ for several centrality bins in ${\rm Au+Au}$ collisions. Mid (forward) rapidity data are shown with open (filled) circles. See text for description of the errors.
• Figure 4: $J/\psi$$R_{\rm AA}$ vs. $y$ for different centrality bins. Open (filled) circles are for mid (forward) rapidity. See text for description of the errors.
• Figure 5: (a) $J/\psi$$R_{\rm AA}$ vs. $N_{\rm part}$ for ${\rm Au+Au}$ collisions. Mid (forward) rapidity data are shown with open (filled) circles. (b) Ratio of forward/mid rapidity $J/\psi$$R_{\rm AA}$ vs. $N_{\rm part}$. For the two most central bins, mid rapidity points have been combined to form the ratio with the forward rapidity points. See text for description of the errors.