Abstract
A left-right-symmetric extension of the standard electroweak interaction model is presented in which baryon- ({ital B}-) and lepton- ({ital scrL}-) number conservation are considered as spontaneously broken gauge symmetries. The gauge, global, and the mixed gauge-gravitational anomalies in the model are canceled by invoking new fermion matter that carries baryon as well as lepton numbers. We find a class of models in which the exotic fermions carry the same electric charges as the {ital N} families of conventional fermions but different {ital B} and {ital scrL} charges. The Higgs structure in this case allows a light massive neutral boson with a lower bound of 120 GeV.
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