Speaker
Description
The Compton amplitude offers a unifying lens through which to explore the structure of hadrons, connecting deep-inelastic phenomena with low-energy sum rules and nonperturbative dynamics. In this talk, I will present a series of lattice QCD investigations that leverage the Feynman-Hellmann relation to access this amplitude directly, enabling a systematic study of structure function moments, power corrections, and twist expansions. By combining formal developments with numerical results, we shed light on both spin-independent and spin-dependent sectors, including the elusive subtraction function, parity-violating observables, and higher-twist contributions. These results highlight the growing role of the Compton amplitude as a precision tool in hadron structure and a bridge between lattice QCD and phenomenology.
