Associative charm photoproduction with circularly polarized photons

Abstract

We calculate the asymmetries for the processes $\vec{\gamma }+\vec{p}\to {\Lambda }_c^{+}({\Sigma }_c^{+})+\overline{D^0}$ and $\vec{\gamma }+\vec{p}\to {\Lambda }_c^{+}({\Sigma }_c^{+})+\overline{D^{\ast }}$, 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 $E_{\gamma }=70$ GeV. In the case of pseudoscalar meson photoproduction, the predictions are qualitatively model-independent. For $D^{\ast }$-photoproduction, there is a strong dependence of the asymmetries on $N{\Lambda }_{c}D(D^{\ast })$-coupling constants.

Comments: Add details on previously published model