Sub-eikonal corrections to scattering amplitudes at high energy

Understand

Most of the progress in high-energy Quantum Chromodynamics has been obtained within the eikonal approximation and infinite Wilson-line operators.

• Evolution equations of Wilson lines with respect to the rapidity parameter encode the dynamics of the hadronic processes at high energy.
• However, even at high energy many interesting aspects of hadron dynamics are not accessible within the eikonal approximation, the spin physics being an obvious example.
• The higher precision reached by the experiments and the possibility to probe spin dynamics at future Electron Ion Colliders make the study of deviations from eikonal approximation especially timely.