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Proceedings/Recueil Des Communications Acta Physica Polonica B Proceedings Supplement Année : 2023

Accessing GPDs through the exclusive photoproduction of a photon-meson pair with a large invariant mass

Résumé

We study the exclusive photoproduction 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 to chiral-even GPDs as well as chiral-odd GPDs. We focus here on the chiral-even sector. The computation is performed at leading order and leading twist. We discuss the prospects of measuring them in various experiments such as JLab 12-GeV, COMPASS, future EIC and LHC (in ultraperipheral collisions). In particular, the high centre of mass energies available at collider experiments can be used to probe GPDs at small skewness $ \xi $. We also compute the polarisation asymmetries with respect to the incoming photon. The results for an alternative distribution amplitude (`holographic' form) are also compared with the predictions obtained with an asymptotic distribution amplitude.

Dates et versions

hal-03884221 , version 1 (05-12-2022)

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Citer

Goran Duplančić, Saad Nabeebaccus, Kornelija Passek-Kumerički, Bernard Pire, Lech Szymanowski, et al.. Accessing GPDs through the exclusive photoproduction of a photon-meson pair with a large invariant mass. Acta Physica Polonica B Proceedings Supplement, 16 (5), pp.16, 2023, ⟨10.5506/APhysPolBSupp.16.5-A16⟩. ⟨hal-03884221⟩
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