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Constraints imposed by CP conservation in the presence of pseudoparticles

1977; American Physical Society; Volume: 16; Issue: 6 Linguagem: Inglês

10.1103/physrevd.16.1791

1538-4500

R.D. Peccei, Helen R. Quinn,

Quantum Chromodynamics and Particle Interactions

We elaborate on an earlier discussion of $\mathrm{CP}$ conservation of strong interactions which includes the effect of pseudoparticles. We discuss what happens in theories of the quantum-chromodynamics type when we include weak and electromagnetic interactions. We find that strong $\mathrm{CP}$ conservation remains a natural symmetry if the full Lagrangian possesses a chiral U(1) invariance. We illustrate our results by considering in detail a recent model of (weak) $\mathrm{CP}$ nonconservation.