Small Angle J/Psi Production in ppbar Collisions at sqrt(s)=1.8TeV

Abstract

This paper presents the first measurement of the inclusive J/Psi production cross section in the forward pseudorapidity region 2.5<|eta|<3.7 in ppbar collisions at sqrt(s)=1.8TeV. The results are based on 9.8 pb-1 of data collected using the D0 detector at the Fermilab Tevatron Collider. The inclusive J/Psi cross section for transverse momenta between 1 and 16 GeV/c is compared with theoretical models of charmonium production.

Figures (3)

• Figure 1: The invariant mass spectrum of opposite sign dimuons with 1.0 $\leq p_{T}^{\mu \mu }\leq 16$ GeV/$c$ and 2.5 $\leq |\eta ^{\mu\mu }| \leq$ 3.7. The hatched area indicates the $J/\psi$ signal above the sum of the backgrounds.
• Figure 2: The $p_{T}$ dependence of the $J/\psi$ differential cross section and its theoretical predictions (upper figure). Only the statistical errors are shown. The lower figure presents systematic uncertainties; the solid curves are the sum of all systematic errors, the dashed curves represent the uncertainty band due to $J/\psi$ polarization. The upper (lower) dashed curve corresponds to 100$\%$ transverse (longitudinal) polarization.
• Figure 3: The pseudorapidity dependence of the $J/\psi$ production cross section with $p_T> 5$ GeV/$c$ (upper points and curve) and $p_T> 8$ GeV/$c$ (lower points and curve). The error bars are statistical and systematic errors (polarization uncertainties not included) summed in quadrature.