Chiral symmetry breaking and effective Lagrangians for softly broken supersymmetric QCD - art. no. 115013

We study supersymmetric QCD with N-f<N-c in the limit of small supersymmetr y-breaking masses and smaller quark masses using the weak-coupling Kahler p otential. We calculate the full spectrum of this theory, which manifests a chiral symmetry breaking pattern similar to that caused by the strong inter actions of the standard model. We derive the chiral effective Lagrangian fo r the pion degrees of freedom, and discuss the behavior in the formal limit of large squark and gluino masses and for large N-c. We show that the resu lting scalings of the pion decay constant and pion masses in these limits d iffer from those expected in ordinary nonsupersymmetric QCD. Although there is no weak coupling expansion with N-f=N-c, we extend our results to this case by constructing a superfield quantum modified constraint in the presen ce of supersymmetry breaking. [S0556-2821(98)03213-5].