Abstract
While the standard electro-weak model, based on the spontaneously broken local symmetry SU(3) c × SU(2) L × U(1) Y , has been extremely successful in the description of low-energy weak phenomena, it leaves a lot of questions unanswered. One of the unsolved problems is understanding the origin of parity violation in low-energy physics. An interesting approach is to assume that the interaction Lagrangian (or dynamics) is intrinsically left-right symmetric, the asymmetry observed in nature (i.e., β-decay and μ-decay, etc.) arising from the vacuum being noninvariant under parity symmetry. Within the framework of gauge theories this idea has found its realization in the SU(2) L × SU(2) R × U(1) B -L models [1] constructed in 1973–1974. An important feature of this model is that, at low energies, it reproduces all the features of the SU(2) L × U(1) model, and as we move up in energies new effects associated with parity invariance of the Lagrangian (such as a second neutral Z-boson, right-handed charged currents, right-handed neutrino) are supposed to appear.
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Mohapatra, R.N. (1992). Left-Right Symmetric Models of Weak Interactions. In: Unification and Supersymmetry. Graduate Texts in Contemporary Physics. Springer, New York, NY. https://doi.org/10.1007/978-1-4757-4373-9_6
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