Symmetry breakings in supersymmetric quantum chromodynamics with Ncolor < Nflavor

In supersymmetric quantum chromodynamics (SQCD) with Ncolor(=N) < Nflavor(=M), influences of explicit supersymmetry (SUSY)- and chiral symmetry-breakings are examined on the basis of an effective lagrangian for SQCD. The effective lagrangian reproduces symmetry-breakings consistent with complementarity in the massless SQCD and with instanton-analysis in the massive SQCD for M-N massive flavors. A chiral SU(M-N) symmetry, which remains unbroken in the massless SQCD, is broken by the SUSY- breakings even in the absence of the explicit breakings of SU(M-N). Comments are made on SQCD viewed as an underlying dynamics for composite quarks and leptons. (author)