Abstract
1. Introduction; (a) The mass pitfalls of the old quark model. (b) Perturbative and spontaneous masses in QCD.2. Running masses in QCD; (a) Masses from spectral sum rules. (b) Lower bounds on running masses and upper bounds on non-perturbative masses.3. Isospin and SU(3) violations from the quark mass matrix in radiative meson decays.
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