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Exploring GPDs through the photoproduction of a $\gamma \rho$ pair

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arxiv 1708.09164 v1 pith:TLKFQA2Z submitted 2017-08-30 hep-ph hep-exnucl-exnucl-th

classification hep-phhep-exnucl-exnucl-th
keywords gammagpdschiral-evenchiral-oddgeneralizedpairproductionaccess
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We describe the process $\gamma N \to \gamma\,\rho N'$ in the generalized Bjorken regime where the $\gamma\,\rho $ pair has a large invariant mass. In the collinear QCD factorization framework, the amplitude gives access to both chiral-even and chiral-odd quark generalized parton distributions (GPDs), and is insensitive to gluon GPDs. The separation of longitudinally and transversely polarized $\rho$ meson production allows to distinguish chiral-even and chiral-odd contributions. Production rates are estimated in the kinematics of the near-future JLab~12-GeV experiments.

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