Jψas a trigger inp¯pcollisions

Abstract

We calculate the inclusive $\psi$ cross section in $\overline{p}p$ collisions and emphasize its importance as (i) a unique measure of $b\overline{b}$ production via the decay $B\to \psi X$, and (ii) a clean and sensitive probe of the small-$x$ gluon distribution via the production mechanism $\mathrm{gg}\to \chi g$ followed by $\chi \to \psi \gamma$.