Double-spin asymmetry ofJ/ψproduction in polarizedppcollisions

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Abstract

We calculate the color-octet contribution to the double spin asymmetry of $J/\ensuremath{\psi}$ hadroproduction with nonzero transverse momenta at fixed target energies $\sqrt{s}\ensuremath{\simeq}40\mathrm{GeV}.$ It is shown that the color-octet contribution is dominant in the asymmetries. The expected asymmetries and statistical errors in a future option of DESY HERA with longitudinally polarized protons at HERA-$N\ensuremath{\rightarrow}$ should allow one to distinguish between different parametrizations for the polarized gluon distribution in the proton.

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