Abstract
Heavy diatomic molecules have been identified as good candidates for use in electron electric dipole moment (eEDM) searches. Suitable molecular species can be produced in pulsed beams, but with a total flux and/or temporal evolution that varies significantly from pulse to pulse. These variations can degrade the experimental sensitivity to changes in spin precession phase of an electri- cally polarized state, which is the observable of interest for an eEDM measurement. We present two methods for measurement of the phase that provide immunity to beam temporal variations, and make it possible to reach shot-noise-limited sensitivity. Each method employs rapid projection of the spin state onto both components of an orthonormal basis. We demonstrate both methods using the eEDM-sensitive H state of thorium monoxide (ThO), and use one of them to measure the magnetic moment of this state with increased accuracy relative to previous determinations.
Highlights
Measuring the electron electric dipole moment, de, with sensitivity to de < 10−27 e cm would provide an improved probe of CP violation originating at energy scales E in the range E > 1 TeV [1]
Heavy diatomic molecules have been identified as good candidates for use in electron electric dipole moment searches
Each method employs rapid projection of the spin state onto both components of an orthonormal basis. We demonstrate both methods using the electric dipole moment (eEDM)-sensitive H 3 1 state of thorium monoxide, and use one of them to measure the magnetic moment of this state with increased accuracy relative to previous determinations
Summary
Measuring the electron electric dipole moment (eEDM), de, with sensitivity to de < 10−27 e cm would provide an improved probe of CP violation originating at energy scales E in the range E > 1 TeV [1]. If N can be deduced independently at each measurement, with a good signal-to-noise ratio, the precision in determining the phase may not be greatly compromised This approach is used in several EDM experiments, e.g., in Refs. Our measurements are performed on the H 3 1 state of thorium monoxide (ThO) This state has been identified as a promising system for detecting the eEDM [11,13] due to its -doublet energy level structure (which provides both high eEDM sensitivity and powerful means to reject systematic errors [14,15]), its small magnetic moment [16,17] (which suppresses sensitivity to magnetic noise and systematics [13,18]), and its long lifetime [11,18,19] (which enables high sensitivity to the phase φ). We use one of these methods (with some additional features) to make an improved measurement of the magnetic moment μH of the H state of ThO
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