COLOR-OCTET CONTRIBUTIONS TO X(F) DISTRIBUTIONS IN J PSI HADROPRODUCTION AT FIXED TARGET ENERGIES/

We study J/psi production at fixed-target energies, including the colo r-octet production mechanisms predicted by NRQCD. In an earlier paper. we found that the octet components were crucial in understanding p(T) -integrated forward (x(F)>0) cross sections. Here we make a detailed c omparison of the theoretical predictions with measured x(F) distributi ons from fixed-target experiments. We find that the model predictions agree well with data. Taking into account higher orders in NRQCD, we a rgue that sigma(chi(1))/sigma(chi(2))=0.6. in excellent agreement with data. Similiar arguments also predict that sigma(chi)/sigma(J/psi) is roughly equal in photo- and hadroproduction.