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Momentum Transfer Dependence of the Differential Cross Section for $J/ψ$ Production

We discuss the $t$ dependence of $J/ψ$ production in the region of $0< -t < M^2_ψ$. The forward slope of the elastic differential cross section is calculated assuming a dipole-type dependence for the gluon ladder-proton form factor. The $t$ dependence of $dσ/dt$ is obtained using DGLAP evolution both for the elastic channel at low $-t$ and for the inelastic channel at large values of $-t$, up to $-t\simeq M^2_ψ$. Results are presented and compared with the relevant experimental data.