Search for the electric dipole moment of the electron with thorium monoxide

Details Search for the electric dipole moment of the electron with thorium monoxide Search for the electric dipole moment of the electron with thorium monoxide

2009-08-17

arxiv.org/abs/0908.2412v2

J.Phys.B43:074007,2010

Physics

Atomic Physics

v2: Equation (11) corrected

Scientific paper

10.1088/0953-4075/43/7/074007

The electric dipole moment of the electron (eEDM) is a signature of CP-violating physics beyond the Standard Model. We describe an ongoing experiment to measure or set improved limits to the eEDM, using a cold beam of thorium monoxide (ThO) molecules. The metastable $H {}^3\Delta_1$ state in ThO has important advantages for such an experiment. We argue that the statistical uncertainty of an eEDM measurement could be improved by as much as 3 orders of magnitude compared to the current experimental limit, in a first-generation apparatus using a cold ThO beam. We describe our measurements of the $H$ state lifetime and the production of ThO molecules in a beam, which provide crucial data for the eEDM sensitivity estimate. ThO also has ideal properties for the rejection of a number of known systematic errors; these properties and their implications are described.

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