Production of $J/\psi$-pairs at HERA-$\vec{\mathrm{N}}$

Abstract

The production of $J/\psi$-pairs as a possible measure of the polarized gluon distribution $\Delta G(x)$ is studied for proton--nucleon collisions at $\sqrt{s}=40\text{mbox}{GeV}^2$ (HERA-$\vec{\mathrm{N}}$). Possibilities of reconstructing the helicity state of at least one of the $J/\psi$'s are critically reviewed. The observation of production asymmetries in the single polarized mode of HERA-$\vec{\mathrm{N}}$ is found to be not feasible.

Comments: 8 pages, LATeX, 3 figures availabe as .uu-file