Speaker
Description
Light-front dynamics provides a natural framework for describing hadron structure in terms of partonic degrees of freedom, yet the role of the QCD vacuum remains subtle. In instanton liquid vacuum, nonlocal, momentum-dependent interactions for light quarks emerge from semiclassical gauge configurations in Euclidean space. By analytical continuation back to lightcone signature, we connects vacuum-induced covariant wave functions using Bethe-Salpeter-Faddeev resummation to light-front parton wave functions. We further compute key light-front observables, including distribution amplitudes (DAs), parton distribution functions (PDFs), and transverse momentum dependent distributions (TMDs) for light mesons and nucleons, incorporating both renormalization group and Collins–Soper evolution. The results show good agreement with experimental data and lattice QCD. Overall, this work provides a clean picture in which light-front hadron structure emerges from QCD vacuum topology, bridging nonperturbative vacuum physics with measurable partonic observables.