DOUBLE-SPIN ASYMMETRY OF J PSI PRODUCTION IN POLARIZED PP COLLISIONS/

We calculate the color-octet contribution to the double spin asymmetry of J/psi hadroproduction with nonzero transverse momenta at fixed tar get energies root s similar or equal to 40 GeV. It is shown that the c olor-octet contribution is dominant in the asymmetries. The expected a symmetries and statistical errors in a future option of DESY HERA with longitudinally polarized protons at HERA-(N) over right arrow should allow one to distinguish between different parametrizations for the po larized gluon distribution in the proton.