Weak Neutral Currents Based on Urbaryon-Lepton Correspondence

Neutral currents are discussed on the basis of urbaryon-lepton correspondence under the usual assumptions of (i) the separate conservation of muon and electron numbers, (ii) muon-electron universality and (iii) the two-component theory of massless neutrinos. According to this correspondence, two types of hadronic neutral currents are obtained. One is U-spin invariant and the other allows the transition between charmed and ordinary hadrons. On the other hand, space-time structures of both hadronic and leptonic neutral current are assumed to be expressed as any combinations of vector and axial-vector. The A/V ratio of neutral currents is calculated by these hadronic neutral currents in the framework of quartet quark parton model from CERN-G. G. M. neutral current data. (40 refs)