Journal
NUCLEAR PHYSICS B
Volume 573, Issue 1-2, Pages 177-200Publisher
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DOI: 10.1016/S0550-3213(99)00817-2
Keywords
electric dipole moments of nucleons; QCD sum rules; theta-vacua
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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) = 1.2 X 10(-16)<(theta)over bar>e(.)cm, to approximately 40% precision. With the current experimental bound this translates into a limit on the theta parameter of \<(theta)over bar>\ < 6 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. (C) 2000 Elsevier Science B.V. All rights reserved.
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