Speaker
Description
In view of the increasing precision of theoretical calculations and experimental measurements, power corrections to transverse-momentum-dependent observables have become highly important. Power corrections for TMD observables are a rich and complex subject, and are difficult to grasp even in the most simple scenarios. Our goal is to understand TMD factorization at next-to-leading power for a relatively simple case: the semi-inclusive annihilation of an electron and a positron into two jets. By working with jets, everything is perturbatively calculable and there are substantial simplifications compared to the general next-to-leading power framework. We obtain a factorized expression for the cross section and identify the new jet functions that appear at next-to-leading power. As expected, we encounter special rapidity divergences and endpoint divergences. Importantly, our analysis with jets can be extended to semi-inclusive deep-inelastic scattering, with the future Electron-Ion Collider as key application.