Some Exact Results in QCD-like Theories

I propose a controlled approximation to QCD-like theories with massless quarks by employing supersymmetric QCD perturbed by anomaly-mediated supersymmetry breaking. They have identical massless particle contents. Thanks to the ultraviolet insensitivity of anomaly mediation, dynamics can be worked out exactly when m, where m is the size of supersymmetry breaking and the dynamical scale of the gauge theory. I demonstrate that chiral symmetry is dynamically broken for N₅32N₂ while the theories lead to nontrivial infrared fixed points for larger number of flavors. While there may be a phase transition as m is increased beyond, qualitative agreements with expectations in QCD are encouraging and suggest that two limits m and m may be in the same universality class.