Probing Generalized Parton Distributions through the photoproduction of a γ π pair

G. Duplan\v{c}i\'c , K. Passek-Kumeri\v{c}ki , B. Pire , L. Szymanowski , S. Wallon

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classification ✦ hep-ph hep-exnucl-exnucl-th

keywords distributionsgammageneralizedpairpartonphotoproductionaccessaxial

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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.

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Probing Generalized Parton Distributions through the photoproduction of a γ π pair

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