ELECTROWEAK INTERACTIONS WITH DISTINCTLY GAUGED QUARK AND LEPTON HYPERCHARGES

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Abstract
The possibility that quarks and leptons have distinct hypercharge sources in nature is considered. This requires the gauge symmetry of electroweak interactions to be extended from SU (2)× U (1) to SU (2)× U (1)× U (1). Consistent with data on neutrino neutral currents and the measurement of forward-backward charge asymmetry in e+e−→μ+μ−, a second neutral boson exists that has mass either below or above the mass of the presently discovered neutral boson.

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