Altarelli-Parisi Equations

The Altarelli-Parisi equations describe how the internal structure of protons and neutrons changes when viewed at different energy levels in particle physics experiments. They model how the probabilities of finding smaller particles, called quarks and gluons, inside these particles evolve as the energy scale varies. Essentially, these equations help scientists understand how the distribution of these internal constituents shifts with energy, which is crucial for predicting outcomes in high-energy collisions, such as those in particle accelerators like the Large Hadron Collider.