Jψpair production in hadronic collisions

Resonance productions of $\frac{J}{\psi }$ pairs in $\pi p$ and $\mathrm{pp}$ collisions are calculated in a Drell-Yan-type mechanism with gluon fusion via the color vector-dominance model. The calculated cross sections and the longitudinal-momentum distributions are consistent with the $\pi p\to \mathrm{JJX}$ data at $p_L=150\mathrm{} \mathrm{and} 280$ GeV/c. They are 20-30 times larger than the perturbative QCD results for $\frac{q\overline{q}}{\mathrm{gg}}\to \mathrm{JJ}$. Calculations for the resonance productions of $J\omega$, $D^{*}{\overline{D}}^{*}$, $J\phi$, $F^{*}{\overline{F}}^{*}$, $\Upsilon \Upsilon$, $\Upsilon \omega$, $B^{*}{\overline{B}}^{*}$, $\Upsilon \phi$, $B_s^{*}{\overline{B}}_s^{*}$, $\Upsilon J$, and $B_c^{*}{\overline{B}}_c^{*}$ in $\pi p$ and $\mathrm{pp}$ collisions are also presented.