Decoupling of Parity- and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="normal">SU</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mn/><mml:mo>(</mml:mo><mml:mn>2</mml:mn><mml:mo>)</mml:mo><mml:mn/></mml:mrow><mml:mrow><mml:mi>R</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>-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 $\mathrm{SU}{(2)}_{R}$-breaking scales are decoupled from each other. This changes the spectrum of physical Higgs bosons which leads to different patterns for gauge hierarchies in $\mathrm{SU}{(2)}_{L}\ensuremath{\bigotimes} \mathrm{SU}{(2)}_{R}\ensuremath{\bigotimes} \mathrm{SU}{(4)}_{C}$ and SO(10) models. Most interesting are two SO(10) symmetry-breaking chains with an intermediate $\mathrm{U}{(1)}_{R}$ symmetry. These are such as to provide new motivation to search for $\ensuremath{\Delta}B=2$ and right-handed current effects at low energies.