title: Pions in large N quantum chromodynamics.
abstract: An effective field theory of quarks, gluons, and pions, with the number N of colors treated as large, is proposed as a basis for calculations of hadronic phenomena at moderate energies. The qualitative consequences of the large N limit are similar though not identical to those in pure quantum chromodynamics, but because constituent quark masses appear in the effective Lagrangian, the 't Hooft coupling in the effective theory need not be strong at moderate energies. To leading order in 1/N the effective theory is renormalizable, with only a finite number of terms in the Lagrangian.
authors.affiliation: Department of Physics, University of Texas, Austin, Texas 78712, USA. weinberg@physics.utexas.edu
authors.forename: Steven
authors.initials: S
authors.lastname: Weinberg