The expectation value of the θ term in QCD for nuclear matter is estimated in the nucleon gas approximation. There is no significant renormalization (to an accuracy ∼10%) of the CP violation in nuclei due to the similar behaviors for the in-medium values of the θ term and quark condensates.
Published in Physical Review C, Volume 47, Issue 2, 1993, pages 802-805.
Gudkov, V.P. (1993). In-medium behavior of the QCD θ term and the value of CP violation in nuclei. Physical Review C, 47(2), 802-805. doi: 10.1103/PhysRevC.47.802
© 1993 The American Physical Society.