Chiral Estimates of Strong CP Violation Revisited

Details Chiral Estimates of Strong CP Violation Revisited Chiral Estimates of Strong CP Violation Revisited

1992-12-17

arxiv.org/abs/hep-ph/9212274v1

Phys.Rev.D48:3304-3309,1993

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages with 3 figures not included but available upon request, CALT-68-1842

Scientific paper

10.1103/PhysRevD.48.3304

The effects of the CP violating $\theta$ term in the QCD Lagrangian upon low energy hadronic phenomenology are reconsidered. Strong CP violating interactions among Goldstone bosons and octet baryons are incorporated into an effective chiral Lagrangian framework. The $\theta$ term's impact upon the decays $\eta\to\pi\pi$ and $\pi^0\to\gamma\gamma$ is then investigated but found to be extremely small. A refined model independent estimate of nonanalytic contributions to the neutron electric dipole moment is also determined using velocity dependent Baryon Chiral Perturbation Theory. We obtain the approximate upper bound $|\theta| < 4.5 \times 10^{-10}$.

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