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Photoproduction of a pair of particles with large invariant mass is a naturalextension of collinear QCD factorization theorems which have been much studiedfor deeply virtual Compton scattering and deeply virtual meson production. Weconsider the case where the wide angle Compton scattering subprocess $\gamma(q\bar q) \to \gamma \rho $ factorizes from generalized parton distribution. Atdominant twist, separating the transverse (respectively longitudinal)polarization of the $\rho$ meson allows one to get access to chiral-odd(respectively chiral-even) GPDs. This opens a new way to the extraction ofthese elusive transversity GPDs.

On $\gamma N \to \gamma \rho N'$ at large $\gamma \rho$ invariant mass