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Probing Generalized Parton Distributions through the photoproduction of a $\gamma \pi$ pair

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arxiv 1812.09307 v1 pith:X56T5EWA submitted 2018-12-21 hep-ph hep-exnucl-exnucl-th

G. Duplančić , K. Passek-Kumerički , B. Pire , L. Szymanowski , S. Wallon This is my paper
classification hep-phhep-exnucl-exnucl-th
keywords distributionsgammageneralizedpairpartonphotoproductionaccessaxial
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

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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