Color singlet relativistic correction in J/psi photoproduction - art. no. 114502

The O(v(2)) relativistic correction for inelastic J/psi photoproduction, in which heavy quark pairs are in the dominant Fock state of the quarkonium, is studied in the framework of NRQCD factorization. An assessment of its si gnificance, particularly in comparison to the color octet contributions, is made, it is found that the impact on the energy distribution is negative i n certain regions of phase space. The predictions are compared with photopr oduction data from DESY HERA.