Abstract
The metastable excited state a(1)[3Σ+] of PbO is proposed as a candidate system in which to search for an electron electric dipole moment (EDM). It is shown that the sensitivity to an electron EDM (de) could reach 10−31 e⋅cm—an improvement of >104 over the current limit. Observation of an electron EDM would provide definitive evidence for physics beyond the standard model, and many currently favored theories predict |de|>10−31. The sensitivity of the proposed technique arises from a combination of several unique properties of PbO, which simultaneously provide a large EDM enhancement factor, narrow magnetic resonance lines, and high counting rates. The structure of the nearly degenerate Ω-doublet system in PbO permits the use of unique and powerful techniques for the rejection of systematic effects.
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