Statistics and systematics of electron EDM searches with BaF
Abstract
The NL-eEDM experiment searches for a non-zero electric dipole moment of the electron de (eEDM) in the ground state of barium monofluoride (BaF). A beam of BaF from a supersonic expansion source is probed with the spin precession method presented in Boeschoten2024. This method permits the extraction of an eEDM value as well as values for parameters causing a possible systematic bias leading to a false eEDM. The currently achievable sensitivity is limited by statistics collected in a period of 34 hours and yields an de of 2(3) × 10-25 e\,cm. Furthermore, from the same dataset sufficiently strong limits on parameters which can induce a false eEDM are extracted. These are mainly the electric field E and the intensity of the lasers fields in the fiducial volume of the experiment. We summarize the steps required to upgrade of the experiment to reach a competitive level on de, e.g. an intense laser-cooled beam from a cryogenic buffer gas source and the light collection efficiency of fluorescence.
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