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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Geometrodynamics and charge-like unification: On the vanishing of C, CP violation in QCD, in the limit GF → 0

  • P. Minkowski
  • Physics
    International Journal of Modern Physics A
  • 2018
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]
...

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