Speaker
Jakub Wagner
Description
We present a study of coherent deeply virtual Compton scattering on helium-4 within QCD collinear factorization. Combining the description of elastic form factors with DVCS observables, we constrain the generalized parton distributions of this light nucleus at next-to-leading order in $\alpha_s$. Our analysis includes kinematic twist corrections and QCD evolution, providing a consistent framework for interpreting present and future measurements. The resulting three-dimensional images reveal how quark and gluon distributions differ in their transverse spatial structure, and constitute the first partonic tomography of a light nucleus at this level of accuracy.
Authors
Victor Martinez-Fernandez
(IRFU/CEA and CFNS)
Bernard Pire
(CPHT école polytechnique)
Paweł Sznajder
(National Centre for Nuclear Research)
Jakub Wagner