Quark-lepton correspondence and SU(2) x U(1) x U(1) gauge model

A gauge model based on an SU(2) x U(1) x U(1) group is proposed to accomodate in quark-lepton correspondence in neutral current interactions as well as charged current interactions. It predicts a new type of neutral current for neutrino scattering: Isup((3)) -2 sin2theta Q sup((ω)), where Q sup((ω)) = 1/2 or -1/2. On the basis of a composite substructure of quarks and leptons suggested by the quark-lepton correspondence, a new charge Q sup((ω)) can be understood as an electric charge of a ''fermion'' which forms quarks and leptons together with another ''boson'' carrying the baryon (lepton) number. (author)