Photoproduction of eta(c) in nonrelativistic QCD

Photoproduction of eta(c) in nonrelativistic QCD is studied. We find that t he color-singlet contributions to this process vanish at not only the leadi ng order but also the next to leading order in perturbative QCD, and that t he dominant contribution comes from the color-octet matrix element S-1(0)(8 ) of eta(c), which is related to that of S-3(1)(8) of J/psi by the heavy qu ark spin symmetry, and is well determined from direct J/psi production at l arge transverse momentum at the Fermilab Tevatron. This process may clarify the existing conflict between the color-octet prediction and experimental results on J/psi photoproduction.