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Physical quark-number charges of dyons are determined, via a formula whichgeneralizes that of Witten for the electric charge, in N=2 supersymmetrictheories with $SU(2) \times U(1)^{N_f} $ gauge group. The quark numbers of themassless monopole at a nondegenerate singularity of QMS turn out to vanish inall cases. A puzzle related to CP invariant cases is solved. Generalization ofour results to $SU(N_c)\times U(1)^{N_f}$ gauge theories is straightforward.Comment: Latex file, 14 pages, 1 Postscript figur

Quark Number Fractionalization in N = 2 Supersymmetric SU(2) × U(1)Nf Gauge Theories

Quark Number Fractionalization in N = 2 Supersymmetric SU(2) × U(1)^N_f Gauge Theories