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arXiv · 2604.25677

Coherent deeply virtual Compton scattering on helium-4 beyond leading power

Víctor Martínez-Fernández·B. Pire·P. Sznajder·J. Wagner
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Abstract

Coherent hard exclusive reactions on light nuclei provide access to their quark and gluon structure and enable three-dimensional tomography of these complex systems. We study deeply virtual Compton scattering on a helium-4 target, including both kinematic twist-3 and twist-4 corrections, as well as next-to-leading-order corrections to the twist-2 amplitude in the strong coupling $\alpha_s$. We show that these contributions are crucial for achieving a precise description of the data and, as a result, obtain the first tomographic image of the helium-4 nucleus at the quark-gluon level.

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Víctor Martínez-Fernández, B. Pire, P. Sznajder, J. Wagner. 2026-04-28. Coherent deeply virtual Compton scattering on helium-4 beyond leading power. https://arxiv.org/abs/2604.25677

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