For 10 points, name this theory of the strong force.
Two and three point correlation functions of currents are used in conjunction with operator product expansion to derive rules for sums important in this theory. The expectation value of the Wilson loop of this theory depends on the loop's area. Observation of tauon decay can be used to determine a coupling constant in this theory. The Callen-Gross relation relates two functions in this theory that predict the outcome of deep inelastic scattering experiments, the (*) Bjorken scaling functions. Self-interactions in this theory make perturbative calculations impossible, so most computations are done by simulating this theory on a lattice. This theory's symmetry group is the eight- dimensional SU(3). Some particles described by this theory are never seen in isolation due to confinement, including quarks and gluons. For 10 points, name this theory of the strong force.
Two and three point correlation functions of currents are used in conjunction with operator product expansion to derive rules for sums important in this theory.
QCD or quantum chromodynamics