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Describing hadronic structure is one of the most intriguing problems inphysics. In this respect, generalized parton distributions (GPDs) constitute anoutstanding tool, allowing to draw "three dimensional pictures" of hadron'sinside. Starting from contemporary models for pion's GPDs fulfilling allconstraints imposed by QCD, we compute Compton form factors (CFFs) of pionssubjected to deeply virtual Compton scattering. We show the behaviour of CFFsto be gluon-dominated at EIC's kinematics. Finally we evaluate lepton-beam-spinasymmetries in the Sullivan process, demonstrating the existence of such andthus triggering optimism about the possibility of probing pion's 3D structureat electron-ion colliders.

Accessing pion GPDs through the Sullivan process: is it feasible?