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Article Dans Une Revue Physical Review D Année : 2023

The Recoil Proton Polarization: a new discriminative DVCS observable

Résumé

Generalized parton distributions describe the correlations between the longitudinal momentum and the transverse position of quarks and gluons in a nucleon. They can be constrained by measuring photon leptoproduction observables, arising from the interference between Bethe-Heitler and Deeply virtual Compton scattering processes. At leading-twist/leading-order, the amplitude of the latter is parameterized by complex integrals of the GPDs {H, E, H̃, Ẽ} . As data collected on an unpolarized or longitudinally polarized target constrains H and H̃, E is poorly known as it requires data collected with a transversely polarized target, which is very challenging to implement in fixed target experiments. The only alternative considered so far has been DVCS on a neutron with a deuterium target, while assuming isospin symmetry and absence of final-state interactions. Today, we introduce the polarization of the recoil proton as a new DVCS observable, highly sensitive to E, which appears feasible for an experimental study at a high-luminosity facility such as Jefferson Lab.

Dates et versions

hal-03790746 , version 1 (28-09-2022)

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Citer

Olga Bessidskaia Bylund, Maxime Defurne, Pierre A.M. Guichon. The Recoil Proton Polarization: a new discriminative DVCS observable. Physical Review D, 2023, 107 (1), pp.014020. ⟨10.1103/PhysRevD.107.014020⟩. ⟨hal-03790746⟩
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