Exclusive photoproduction of a $\gamma \rho$ pair with a large invariant mass

Abstract

Exclusive photoproduction of a $\gamma \rho$ pair in the kinematics where the pair has a large invariant mass and the final nucleon has a small transverse momentum is described in the collinear factorization framework. The scattering amplitude is calculated at leading order in ${\alpha }_s$ and the differential cross sections for the process where the $\rho -$meson is either longitudinally or transversely polarized are estimated in the kinematics of the JLab 12-GeV experiments.

published version; 54 pages, 23 figures. The cross section for the exclusive photoproduction of a $\gamma \rho$ pair, in the case where the final $\rho$-meson is longitudinally polarized, has been corrected

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