Associative charm photoproduction with circularly polarized photons

We calculate the asymmetries for the processes γ→+p→→Λc+(Σc+)+D0 and γ→+p→→Λc+(Σc+)+D∗, induced by circularly polarized photons on a polarized proton target in the framework of an effective Lagrangian model. We found large and positive values for the asymmetry induced by the z-component of the proton polarization, in a wide energy region, from threshold up to Eγ=70 GeV. In the case of pseudoscalar meson photoproduction, the predictions are qualitatively model-independent. For D∗-photoproduction, there is a strong dependence of the asymmetries on NΛcD(D∗)-coupling constants.