Abstract
A possible extension of the standard model can be defined by gauging the global baryon- and lepton-number U(1) symmetries. Gauging baryon and lepton numbers provides a natural framework for the seesaw mechanism in the lepton sector, and the Peccei-Quinn mechanism in the quark sector. Another consequence of this extension is that the usual three generations of fermions are not anomaly-free. However, we consider a wider framework involving the existence of generations with exotic SU(2){sub {ital L}}{direct product}U(1){sub {ital Y}} quantum numbers. This allows us to derive'' a spectrum of fermions which contain the known quarks and leptons.
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