Generalized parton distributions at zero skewness

Abstract

We present a new determination of the generalized parton distributions (GPDs) with their uncertainties at zero skewness, $\xi =0$, through a simultaneous analysis of all available experimental data of the nucleon electromagnetic form factors (FFs), nucleon charge and magnetic radii, proton axial FFs (AFFs) and wide-angle Compton scattering (WACS) cross sections for the first time, and we investigate whether there is any tension between these data. This can be considered the most comprehensive analysis of GPDs at $\xi =0$ performed so far. We show that such an analysis provides the simultaneous determination of three kinds of GPDs, namely $H^q$, ${\tilde{H}}^q$ and $E^q$, considering also the sea-quark contributions. As a result, we find that the inclusion of the WACS and AFF data at larger values of the momentum transfer squared $Q^2=-t$ can put new constraints on GPDs and change them drastically in some cases. We show that there is a considerable tension between the WACS and the proton magnetic form factor ($G_M^p$) data, especially at larger values of $-t$. However, we indicate that the results for the gravitational FF $M_2$ and the proton total angular momentum $J^p$ calculated using the extracted GPDs are in relatively good agreement with the light-cone QCD sum rules (LCSRs) and lattice QCD predictions when the sea-quark contributions are considered and both WACS and $G_M^p$ data are included in the analyses simultaneously.

36 pages, 33 figures, and 6 tables; Accepted for publication in Physical Review D

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Cited by in corpus (8)

• Moments of proton GPDs from the OPE of nonlocal quark bilinears up to NNLO
• Moments of Axial-Vector GPD from Lattice QCD: Quark Helicity, Orbital Angular Momentum, and Spin-Orbit Correlation
• Generalized parton distributions from the pseudo-distribution approach on the lattice
• Impact of JLab data on the determination of GPDs at zero skewness and new insights from transition form factors $N\to \Delta$
• Generalized parton distributions of sea quark at zero skewness in the light-cone Model
• Determination of the pion generalized parton distributions at zero skewness
• Reconstruction of Gravitational Form Factors using Generative Machine Learning
• Global Analyses of Generalized Parton Distributions with Diverse PDF Inputs