Polarized J/psi production in deep inelastic scattering at DESY HERA - art. no. 034017

We perform a calculation on the polarization of J/psi production in deep in elastic scattering in the DESY HERA energy range. For the inclusive product ion distributions, we find that the color-singlet contributions are consist ent with the experimental data in the major region of z (z > 0.4). Only in low z regions are there some hints of the need for the color-octet contribu tions to describe the experimental data. For the polarization of J/psi in d eep inelastic scattering processes, we find the parameter a changes with Q( 2). Especially at higher Q(2), the difference in a between color-singlet an d color-octet contributions becomes more distinctive. In the two regions of lower and larger z, the polarization parameter a has different features. T hese properties can provide important information on the polarization mecha nism for J/psi production.