CP Conservation in the Presence of Pseudoparticles

@inproceedings{Peccei1977CPCI,
  title={CP Conservation in the Presence of Pseudoparticles},
  author={Roberto D. Peccei and Helen R. Quinn},
  year={1977}
}
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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