Abstract
In certain extensions of the standard model with additionalU(1) gauge symmetries, the anomalies between the quarks and leptons no longer cancel. It is shown that the anomalies can be cancelled by invoking representations oflepto-quark fermions. Lepto-quarks represent new fermionic matter that carries quark as well as lepton numbers. An extension of the standard model with three and four families of conventional quarks and leptons is presented in which freedom from anomalies is secured through the presence of lepto-quark matter representations. The gauge symmetry of the model isSU(2) L XU(1) q XU(1) l whereU(1) q andU(1) l refer to distinct hypercharge sources for the quarks and the leptons.
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