Theta Vacua, QCD Sum Rules, and the Neutron Electric Dipole Moment

Details Theta Vacua, QCD Sum Rules, and the Neutron Electric Dipole Moment Theta Vacua, QCD Sum Rules, and the Neutron Electric Dipole Moment

1999-08-30

arxiv.org/abs/hep-ph/9908508v4

Nucl.Phys. B573 (2000) 177-200

Physics

High Energy Physics

High Energy Physics - Phenomenology

23 pages, latex; v3: references added; v4: missing overall factor of two reinstated

Scientific paper

10.1016/S0550-3213(99)00817-2

We present a detailed study of the electric dipole moment of the neutron induced by a vacuum theta angle within the framework of QCD sum rules. At next-to-next-to leading order in the operator product expansion, we find the result d_n(\theta) = 2.4 x 10^{-16} \theta e cm, to approximately 40% precision. With the current experimental bound this translates into a limit on the theta parameter of |\theta| < 3 x 10^{-10}. We compare this result with the long-standing estimates obtained within chiral perturbation theory, and observe a numerical similarity, but also significant differences in the source of the dominant contribution.

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