Mirror fermions in the problem of p-parity violation in weak interaction

An ''explicit'' SU(2)sub(L)xSU(2)sub(R)xU (1)-gauge symmetry would be the minimal and rather natural LR-symmetrical generalization of the standard GW-S model within one generation. This theory satisfactorily describes a considerable set of modern data, if only assume that right gauge bosons are heavier than the corresponding left ones: m(Wsub(R)sup(+-), Zsub(R))> or approximately 3m(Wsub(L)sup(+-), Zsub(L)). But in the considered minimal extension of the standard model one comes across difficulties as for the realization of the concrete mechanism of the horizontal symmetry breaking in electroweak interactions, with repect to generations, which first of all, manifest themselves in the connection between mixing angles and quark (leptonic) masses, on the one hand, and in the diagonality principle for neutral currents (the natural GIM mechanism), on the other hand. The ways to overcome these difficulties are: 1) to consider a new universal ''horizontal'' gauge interaction; 2) to introduce ''mirror'' fermions and new gauge vector bosons (a ''heavy'' photon) into the theory