Weak interactions in particle physics violate both Parity (P) and Charge Conjugation (C) symmetries individually while conserving the combined CP symmetry, except for rare exceptions like kaon decay not discussed here. The theoretical framework relies on bilinear covariants constructed from spinors—specifically distinguishing between polar vectors that change sign under spatial inversion and axial vectors that do—to describe transition amplitudes involving left-handed chiral projections defined by $(1-\gamma_5)/2$. This concept belongs to high-energy particle physics, where the violation of discrete symmetries in beta decay serves as a fundamental constraint on the structure of charged-current weak interactions mediated by W bosons.
Weak interactions in particle physics violate both Parity (P) and Charge Conjugation (C) symmetries individually while conserving the combined CP symmetry, except for rare exceptions like kaon decay …