Phenomenology of hadron structure --- why low energy physics matters

Understand

The description of the internal structure of hadrons is one of the main goal of QCD.

• At moderate energy scales, the hadronic representation succeeds to the partonic description, rendering challenging the description of the dynamics of scattering processes and hadronic structure.
• The information on the hadron structure is embodied in the long distance contributions which are defined as Parton Distribution Functions (PDFs).
• PDFs are a key framework for connecting the low and high-energy regimes, in that the knowledge on non- perturbative QCD carries important consequences at the high-energy level.