/a ~ E~/at a Rate of One out of 10 9 Muon Decays?
نویسنده
چکیده
In a gauge theory of weak and associated interactions (electromagnetic, strong .... ) in which parity and time reversal are spontaneously broken discrete symmetries, on an equal footing with the continuous symmetries of SUn (fermions) × SUn (fermions) corresponding to chlral substitutions of lepton and quark flavors respectively, the following features particular to leptons are intrinsically related: (i) Neutrino masses are nonvanishing but orders of magnitude are smaller than charged lepton masses 4:1 [ 1 ]. (ii) Considering the mass scale set by GF 1/2 .~ 300 GeV as small compared to the mass scale on which parity mvariance is restored, the chiral structure of the (light) neutrinos determines the corresponding (lowest level) gauge group to be ((SU2)L × U1) [3]. (iii) Right-handed leptons (and quarks) are singlets with respect to (SU2L) [3]. (Scalars generating the masses of the charged leptons transform as doublets under SU2L.) (iv) Lepton numbers (L e, L u, Le+ L u) are not exactly conserved [ 4 6 ] . We study a scheme for leptons in which the breakdown of parity is reflected by the sequence of gauge groups
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