Continuum QCD and its phenomenology

The following sections are included:

• The Lagrangian and QCD at short distance

• The nonrelativistic quark model

  • Explanations and puzzles

  • Quark model interpolating operators

  • Glueballs, hybrids, and exotics

  • Flavor and glueball mixing example: the anomaly

  • Quark model hadron masses

• Heavy quark systems

  • Quarkonium

  • Heavy quark symmetries

• Chiral symmetry and chiral symmetry breaking

  • Chiral symmetry

  • Linear sigma model

  • Nonlinear sigma model

  • Nonlinear effective chiral Lagrangian for QCD

• A technical aside: Ward identities

• The axial anomaly and instantons

  • Nonconservation of the flavor-singlet axial current

  • Witten-Veneziano formula

  • Suppression of the topological susceptibility

  • QCD vacuum

  • The large N_c limit