Muon g-2 Experiments as Dark Matter Detectors
Ryan Janish, FermiLab
We propose extending the search for dark matter (DM) by considering muon targets. In particular, an ultralight DM background may apply an oscillating torque to muon spins, resulting in novel precession trajectories. A time-resolved analysis of muon precession data from the upcoming Fermilab and J-PARC g-2 experiments is sensitive to this signal, and immediate constraints may also be placed using existing g-2 measurements. In addition, some DM candidates yield conventional precession with a shifted precession frequency, i.e. they provide an effective contribution to the muon magnetic dipole moment which depends on the local DM density. Intriguingly, we find that the current muon g-2 anomaly can be explained by pseudoscalar DM which induces an oscillating electric dipole moment for the muon. This explanation may be verified with a time-resolved analysis.
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