Quark-antiquark contribution to the hadroproduction ofψin the color-singlet model

Abstract

We consider the contribution to $\ensuremath{\psi}$ hadroproduction due to the elementary subprocess $q\overline{q}\ensuremath{\rightarrow}\ensuremath{\psi}\mathrm{GG}$. The color-singlet nature and observed spin-parity of the $\ensuremath{\psi}$ are incorporated and the normalization of the cross section is predicted by the $\ensuremath{\psi}$ wave function at the origin as measured in the leptonic $\ensuremath{\psi}$ decay. We expect this process to dominate the difference in $\ensuremath{\psi}$ production from particle versus antiparticle beams. The energy dependence of $\ensuremath{\psi}$ production as well as distributions in ${x}_{F}$ and ${P}_{T}$ are predicted.

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