Vacuum structure of softly broken N=1 supersymmetric QCD

We study softly broken N=1 supersymmetric QCD with the gauge group SU(Nc) and Nf flavors of quark pairs. We investigate vacuum structure of the theory with generic soft supersymmetry breaking terms. Trilinear soft breaking terms play an essential role in determining vacua. For Nf=Nc+1, chiral symmetry is broken for a sufficiently large magnitude of trilinear couplings, while it is unbroken in the case with only soft masses. In the case where appearance of trilinear coupling terms is allowed, i.e. for Nf≥Nc+1, we have two possible vacua, the trivial and non-trivial ones. Otherwise, we only have the non-trivial vacuum, which corresponds to the non-trivial vacuum in the Nf≥Nc+1 theory.