The GPD H-tilde and spin correlations in wide-angle Compton scattering

Abstract

Wide-angle Compton scattering (WACS) is discussed within the handbag approach in which the amplitudes are given by products of hard subprocess amplitudes and form factors, specific to Compton scattering, which represent 1/x-moments of generalized parton distributions (GPDs). The quality of our present knowledge of these form factors and of the underlying GPDs is examined. As will be discussed in some detail the form factor R_A and the underlying GPD H-tilde are poorly known. It is argued that future data on the spin correlations A_{LL} and/or K_{LL} will allow for an extraction of R_A which can be used to constrain the large -t behavior of H-tilde.

27 pages, 10 figures

References in corpus (6)

• Extraction of Spin-Dependent Parton Densities and Their Uncertainties
• Rosenbluth separation of the ${\pi }^0$ electroproduction cross section
• Compton Scattering Cross Section on the Proton at High Momentum Transfer
• Accessing GPDs from experiment --- potential of a high-luminosity EIC ---
• Uncovering the Scaling Laws of Hard Exclusive Hadronic Processes in a Comprehensive Endpoint Model
• Compton scattering in the Endpoint Model

Cited by in corpus (8)

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• Deep exclusive electroproduction of ${\pi }^0$ at high $Q^2$ in the quark valence regime
• Determination of generalized parton distributions through a simultaneous analysis of axial form factor and wide-angle Compton scattering data
• Twist-3 contributions to wide-angle photoproduction of pions
• Generalized Parton Distributions from charged current meson production
• Wide-angle photo- and electroproduction of pions to twist-3 accuracy