Flavor symmetry breaking in strongly coupled N=1 supersymmetric SO(Nc) gauge theory with Nf = Nc-2

In the SO(N-c) gauge theory with N-f quarks for N-f = N-c- 2, its instanton effects indicate the signal of dynamical flavor symmetry breakdown of SU(N-f) to SO(N-f), which is not described by the conventional "magnetic" degrees of freedom. It is argued that this breaking is well described by our effective superpotential consisting of "electric" quarks and gluons instead of monopoles of SO(N-c). The low-energy particles include the Nambu-Goldstone superfields associated with this breakdown. The proposed superpotential is found to exhibit the holomorphic decoupling property and the anomaly-matching property on a residual chiral U(1) symmetry.