Abstract

Quantum Chromodynamics, the theory of quarks and gluons, is strongly
coupled at low energy. In order to calculate in this energy region,
non-perturbative numerical techniques must be employed. Theoretical
advances in the past four years have, for the first time, made high
precision calculations possible. I'll review these techniques, and the
results, with a focus on the role short distance perturbation theory
plays in these calculations.