SU(4) weak currents

The authors suggest SUsub(L)(4) X U(1) as the gauge symmetry of weak and electromagnetic interactions for quartets of quarks and leptons. They analyze how the (additional) SUsub(L)(4) weak currents (besides the SUsub(L)(2) subgroup) could affect the weak interactions of ordinary particles, the atomic parity violation, the neutral-current neutrino reactions and the decays of the tau heavy lepton and the charmed mesons. The suppression of neutral-current parity violation in atomic experiments can be naturally incorporated in this model while at the same time the success of the Weinberg-Salam model with respect to the inclusive neutral current data is kept. The mdoel has limited freedom and therefore many definite predictions. (Auth.)