Exploring GPDs through the photoproduction of a gamma rho pair
Résumé
We describe the process gamma N -> gamma rho N' in the generalized Bjorken regime where the gamma rho pair has a large invariant mass. In the collinear QCD factorization framework, the amplitude gives access to both chiral-even and chiral-odd quark generalized parton distributions (GPDs), and is insensitive to gluon GPDs. The separation of longitudinally and transversely polarized rho meson production allows to distinguish chiral-even and chiral-odd contributions. Production rates are estimated in the kinematics of the near-future JLab~12-GeV experiments.