  In this paper hadroproduction of charmonium states in polarized pp collisions
is discussed. A thermal picture for the gluonic cloud of comovers is given
making contact between the formalism and the measured unpolarized cross
sections. The experimentally observed non-polarization of the final J/psi
states leads to the consequence that no correlations between the initial proton
spin and the final charmonium spin should be existent. Hence the single spin
asymmetries vanish to leading order in that model.
