Domain wall moduli In softly-broken SQCD at (theta)over bar = pi

We analyze the moduli space dynamics of domain walls in SU(N) QCD at (theta)over bar = pi, by softly breaking N = 1 SQCD with sfermion mixing. In the supersymmetric limit, BPS domain walls between neighboring vacua are known to possess nontranslational flavor moduli that form a CPN-1 sigma model. For the simplest case with gauge group SU(2) and N-f = 2, we show that this sigma model also exhibits a Hopf term descending from the bulk Wess-Zumino term with a quantized coefficient. On soft-breaking of supersymmetry via sfermion mixing that preserves the flavor symmetry, these walls and their moduli-space dynamics survives when (theta)over bar = pi so that there are two degenerate vacua.