Speaker
Andrea Simonelli
(Istituto Nazionale di Fisica Nucleare)
Description
Transverse Momentum Dependent (TMD) parton densities are well-defined QCD operators, however their determination remains challenging due to the dominance of non-perturbative effects at low energy scales. As a consequence, the impact of phenomenological modeling is difficult to control and may lead to a misinterpretation of the information carried by experimental data.
In this talk, the most commonly adopted strategies are reviewed and critically analyzed, and a novel approach based on analytic resummation is proposed. Within this framework, the non-perturbative structure of hadrons is traced back to more fundamental properties of QCD, such as the infrared behavior of the strong coupling and of the collinear parton densities.