  We study in the framework of collinear QCD factorization the photoproduction
of a $\gamma\,\pi$ pair with a large invariant mass and a small transverse
momentum, as a new way to access generalized parton distributions. In the
kinematics of JLab 12-GeV, we demonstrate the feasibility of this measurement
and show the extreme sensitivity of the unpolarized cross section to the axial
quark GPDs.
