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Proceedings/Recueil Des Communications Année : 2023

Accessing GPDs through the exclusive photoproduction of a gamma-meson pair

Résumé

We consider the exclusive photo-production of a photon-meson pair with a large invariant mass, working in the QCD factorisation framework. Explicitly, we consider a $ \rho $-meson or a charged $ \pi $ in the final state. This process gives access both to chiral-even GPDs and chiral-odd GPDs, which are not well-known experimentally, especially the latter ones. The computation is performed at leading order and leading twist. We discuss the prospects of measuring them in experiments, focusing on the kinematics at the JLab 12-GeV experiment, and pPb ultra-peripheral collisions at LHC. In particular, the latter gives access to the small $ \xi $ regime of GPDs.

Dates et versions

hal-03775891 , version 1 (13-09-2022)

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Goran Duplančić, Saad Nabeebaccus, Kornelija Passek-Kumerički, Bernard Pire, Lech Szymanowski, et al.. Accessing GPDs through the exclusive photoproduction of a gamma-meson pair. 2023. ⟨hal-03775891⟩
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