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From hard exclusive meson electroproduction to deeply virtual Compton scattering
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We systematically evaluate observables for hard exclusive electroproduction of real photons and compare them to experiment using a set of Generalized Parton Distributions (GPDs) whose parameters are constrained by Deeply Virtual Meson Production data, nucleon form factors and parton distributions. The Deeply Virtual Compton Scattering amplitudes are calculated to leading-twist accuracy and leading order in QCD perturbation theory while the leptonic tensor is treated exactly, without any approximation. This study constitutes a check of the universality of the GPDs. We summarize all relevant details on the parametrizations of the GPDs and describe its use in the handbag approach of the aforementioned hard scattering processes. We observe a good agreement between predictions and measurements of deeply virtual Compton scattering on a wide kinematic range, including most data from H1, ZEUS, HERMES, Hall A and CLAS collaborations for unpolarized and polarized targets when available. We also give predictions relevant for future experiments at COMPASS and JLab after the 12 GeV upgrade.
Forward citations
Cited by 8 Pith papers
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Kinematic power corrections to DVCS to twist-six accuracy
Complete kinematic power corrections up to twist-6 are derived for nucleon DVCS, and the series converges best when organized in powers of 1/(Q²+t).
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Photon-nucleon entanglement in Compton scattering at low and high energies
Photon-nucleon entanglement in polarized Compton scattering is generically present and, for neutrons, strongly controlled by the nucleon electric and magnetic polarizabilities.
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Exclusive Quark and Gluon Dijet Production as Probes of GPDs at Collider Energies
Exclusive quark and gluon dijet electroproduction is analyzed in collinear factorization as a GPD probe, extending prior work with helicity GPDs and an electromagnetic channel, with HERA comparisons and EIC projections.
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A Unified Neural-Network Framework for Nucleon Imaging from Numerical Simulations of QCD
One neural network simultaneously fits LaMET and short-distance-expansion lattice data to reconstruct light-cone PDFs and zero-skewness GPDs of the nucleon.
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Assessing the impact of the electron ion collider in China on Deeply Virtual Compton Scattering
Projected EicC DVCS asymmetry data would substantially reduce uncertainties on all leading-order Compton form factors, most strongly in the sea-quark region.
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Mechanical properties of the nucleon from the generalized parton distributions
Using a double-distribution GPD model constrained by elastic-scattering data, the paper fits DQ(0) = -3.37 ± 0.17 from Compton form factors and derives proton pressure, shear, and radii.
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Eddington-inspired Born-Infeld gravity: Constraints from the generalized parton distributions (GPDs)
Using the proton's quark pressure profile from a GPD fit, the authors update upper bounds on the EiBI gravity parameter kappa to about 0.1 to 0.3 in the quoted units.
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Kernel methods for evolution of generalized parton distributions
Finite-element discretization turns GPD Q2 evolution into differentiable matrix multiplications; the new tiktaalik code reproduces PARTONS/APFEL++ at about 1% for LO evolution over most of x.
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