Decoupling of Parity- andSU(2)R-Breaking Scales: A New Approach to Left-Right Symmetric Models

A new approach to left-right symmetric models is proposed, where the left-right discrete-symmetry- and $\mathrm{SU}{\mathrm{}\left(2\right)\mathrm{}}_R$-breaking scales are decoupled from each other. This changes the spectrum of physical Higgs bosons which leads to different patterns for gauge hierarchies in $\mathrm{SU}{\mathrm{}\left(2\right)\mathrm{}}_L\otimes \mathrm{SU}{\mathrm{}\left(2\right)\mathrm{}}_R\otimes \mathrm{SU}{\mathrm{}\left(4\right)\mathrm{}}_C$ and SO(10) models. Most interesting are two SO(10) symmetry-breaking chains with an intermediate $\mathrm{U}{\mathrm{}\left(1\right)\mathrm{}}_R$ symmetry. These are such as to provide new motivation to search for $\Delta B=2\mathrm{}$ and right-handed current effects at low energies.