J/psi Production vs Transverse Momentum and Rapidity in p+p Collisions at sqrt(s) = 200 GeV

TL;DR

J/psi production in p+p collisions at square root s=200 GeV has been measured by the PHENIX experiment at the BNL Relativistic Heavy Ion Collider and is sufficient to constrain production models.

Abstract

J/Psi production in p+p collisions at sqrt(s) = 200 GeV has been Measured in the PHENIX experiment at the Relativistic Heavy Ion Collider (RHIC) over a rapidity range of -2.2 < y < 2.2 and a transverse momentum range of 0 < pT < 9 GeV/c. The statistics available allow a detailed measurement of both the pT and rapidity distributions and are sufficient to constrain production models. The total cross section times branching ratio determined for J/Psi production is B_{ll} sigma_pp^J/psi = 178 +/- 3(stat) +/- 53(syst) +/- 18(norm) nb.

Figures (4)

• Figure 1: Invariant mass spectra for a)$J/\psi \rightarrow e^{+} e^{-}$ at $|y| <0.35$ and b) $J/\psi \rightarrow \mu^{+} \mu^{-}$ at $1.2 < |y| <2.2$ with the functional forms used to extract the number of reconstructed $J/\psi$.
• Figure 2: (a) The mid and forward rapidity $J/\psi$ differential cross section times dilepton branching ratio versus $p_{T}$ and (b) the ratio of the mid and forward $p_{T}$ spectra. The vertical error bars are the statistical and point-to-point uncorrelated error and the boxes are the point-to-point correlated systematic error. The solid lines are the fits described in the text.
• Figure 3: PHENIX $\langle p_{\rm T}^2\rangle$ measurements compared to measurements at other energies E789na51CDFpt2 as a function of collision energy for $J/\psi$ production in $p$+$p$ or $p$+$A$ collisions. Also shown is a linear fit vs ln$(\sqrt{s})$.
• Figure 4: The $J/\psi$ differential cross section times dilepton branching ratio plotted versus rapidity. The vertical error bars represent the statistical and point-to-point uncorrelated error and the boxes represent the point-to-point correlated systematic error. The curves are described in the text.