New Instanton Effects In Supersymmetric QCD
Abstract
In supersymmetric QCD with SU(Nc) gauge group and Nf flavors, it is known that instantons generate a superpotential if Nf=Nc-1 and deform the moduli space of vacua if Nf=Nc. But the role of instantons has been unclear for Nf>Nc. In this paper, we demonstrate that for Nf>Nc, on the moduli space of vacua, instantons generate a more subtle chiral operator containing (for example) non-derivative interactions of 2(Nf-Nc)+4 fermions. Upon giving masses to some flavors, one can integrate out some fermions and recover the standard results for Nf=Nc and Nf=Nc-1. For Nf=Nc, our analysis gives, in a sense, a more systematic way to demonstrate that instantons deform the complex structure of the moduli space of vacua.
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