Abstract
The U2 × U2 and D symmetries of the leptonic weak interaction are extended, within the framework of the quartet–quark model, so as to include the hadronic weak interaction. The total weak current satisfies a lepton–quark symmetry. Application of these symmetries to the neutral current weak interaction restricts the current to be composed only of vector and axial vector pieces, and also restricts the symmetry properties of its (V−A) part. Experimental implications of these symmetries in various neutrino reactions are investigated. There are some ambiguities as regards the (V+A) part of the neutral current, which may, however, be resolved soon if more experimental data become available.
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