Quark Number Fractionalization in N=2 Supersymmetric SU(2) × U(1)Nf Gauge Theories
Abstract
Physical quark-number charges of dyons are determined, via a formula which generalizes that of Witten for the electric charge, in N=2 supersymmetric theories with SU(2) × U(1)Nf gauge group. The quark numbers of the massless monopole at a nondegenerate singularity of QMS turn out to vanish in all cases. A puzzle related to CP invariant cases is solved. Generalization of our results to SU(Nc)× U(1)Nf gauge theories is straightforward.
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