Parity non-conservation in beta-decay of nuclei: revisiting experiment and theory fifty years after. IV. Parity breaking models

This part offers a survey of models proposed to cope with the symmetry-breaking challenge. Among them are the two-component neutrinos, the neutrino twins, the universal Fermi interaction, etc. Moreover, the broken discrete symmetries in physics are very much on the agenda and may occupy considerable time for LHC experiments next year aimed at revealing the symmetry-breaking mechanisms.