  Photoproduction of a pair of particles with large invariant mass is a natural
extension of collinear QCD factorization theorems which have been much studied
for deeply virtual Compton scattering and deeply virtual meson production. We
discuss the production of a photon and a meson, where the wide angle Compton
scattering on a meson subprocess factorizes from generalized parton
distribution. We calculate at dominant twist and leading order in $\alpha_s$,
the production cross-section of a transversely polarized $\rho$ meson which is
sensitive to chiral-odd GPDs, and show that it may be measurable in near future
JLab experiments.
