CP Conservation in the Presence of Pseudoparticles

@article{Peccei1977CPCI,
title={CP Conservation in the Presence of Pseudoparticles},
author={Roberto D. Peccei and Helen R. Quinn},
journal={Physical Review Letters},
year={1977},
volume={38},
pages={1440-1443}
}

We give an explanation of the $\mathrm{CP}$ conservation of strong interactions which includes the effects of pseudoparticles. We find it is a natural result for any theory where at least one flavor of fermion acquires its mass through a Yukawa coupling to a scalar field which has nonvanishing vacuum expectation value.

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We present two original derivations of the restoration of C and CP symmetry within QCD, simplest in “standalone QCD” but extendable to include conserved QED, in the limit [Formula: see text]