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Quark and Gluon Tomography of the Helium-4 Nucleus
V Martínez-Fernández1,2, B Pire3, P Sznajder4
1IRFU, CEA, Université Paris-Saclay, -, -, 91191 Gif-sur-Yvette, France.
Abstract:
QCD collinear factorization allows coherent hard exclusive reactions to reveal the quark-gluon structure of light nuclei, enabling their 3D tomography. In this Letter, we investigate elastic form factors and deeply virtual Compton scattering on a helium-4 target. We achieve unprecedented theoretical precision for this type of analysis by constraining generalized parton distributions at next-to-leading order in α_{s}, incorporating kinematic twist corrections, and utilizing full evolution equations. Ultimately, we present the first tomography of a light nucleus, revealing distinct transverse spatial distributions of quarks and gluons.
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