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The abstract and intro of their 1977 paper reads: CP Conservation in the Presence of Pseudoparticles R. D. Peccei and Helen R. Quinn Institute of Theovetical Physics, Department of Physics, Stanford University (Received 31 March 1977) We give an explanation of the CF 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. It is experimentally obvious that we live in a world where P and CP are good symmetries at the level of strong interactions. In the context of quantum chromodynamics the strong interactions are believed to be due to non-Abelian vector glu- ons coupled to massive quarks. In such a theory, when the effects of gluon configurations of non zero pseudoparticle number are included...

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The abstract and intro of their 1977 paper reads: CP Conservation in the Presence of Pseudoparticles R. D. Peccei and Helen R. Quinn Institute of Theovetical Physics, Department of Physics, Stanford University (Received 31 March 1977) We give an explanation of the CF 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. It is experimentally obvious that we live in a world where P and CP are good symmetries at the level of strong interactions. In the context of quantum chromodynamics the strong interactions are believed to be due to non-Abelian vector glu- ons coupled to massive quarks. In such a theory, when the effects of gluon configurations of non zero pseudoparticle number are included...
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Robert McNees (mcnees@mastodon.social)'s status on Friday, 19-May-2023 14:07:43 UTC Robert McNees
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In 1977, Quinn and Peccei proposed a mechanism to explain the lack of CP violation in QCD.
The parameter θ isn’t static, they reasoned. Rather, it’s a field itself. The dynamics of this field within QCD naturally cause it to settle down to a value of zero.
Ref: https://link.aps.org/doi/10.1103/PhysRevLett.38.1440

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