Hadronic EDMs, the Weinberg Operator, and Light Gluinos

Abstract

We re-examine questions concerning the contribution of the three-gluon Weinberg operator to the electric dipole moment of the neutron, and provide several QCD sum rule-based arguments that the result is smaller than - but nevertheless consistent with - estimates which invoke naive dimensional analysis. We also point out a regime of the MSSM parameter space with light gluinos for which this operator provides the dominant contribution to the neutron electric dipole moment due to enhancement via the dimension five color electric dipole moment of the gluino.

6 pages, RevTeX, 3 figures; v2: references added; v3: typos corrected, to appear in Phys. Rev. D

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