J/Psi Production in p+p Collisions at sqrt(s) = 200 GeV

Abstract

Total and differential cross sections for inclusive $J/\psi$ production have been measured in $\sqrt{s} =$ 200 GeV proton-proton collisions at BNL-RHIC. $J/\psi$ particles have been identified via $\mu^{+}\mu^{-}$ decays measured in the forward muon spectrometer covering $1.2 < y < 2.2$ and via $e^{+}e^{-}$ decays measured in the mid-rapidity spectrometers of the PHENIX experiment. Details of the muon channel measurement are presented in this paper based upon an 81-nb$^{-1}$ integrated luminosity obtained in the first p+p run at RHIC. Results are compared with previous experiments as well as theoretical model predictions.