Direct Detection of Ultralight Dark Matter via Charged Lepton Flavor Violation

Kavli Affiliate: Gordan Krnjaic

| First 5 Authors: Innes Bigaran, Patrick J. Fox, Yann Gouttenoire, Roni Harnik, Gordan Krnjaic

| Summary:

We propose a dark matter direct-detection strategy using charged particle
decays at accelerator-based experiments. If ultralight $(m_phi ll text{eV})$
dark matter has a misalignment abundance, its local field oscillates in time at
a frequency set by its mass. If it also couples to flavor-changing neutral
currents, rare exotic decays such as $mu to e phi$ and $tauto e(mu)phi$
inherit this modulation. Focusing on such charged lepton flavor-violating
decays, we show that sufficient event samples can enable detection of
ultralight dark matter candidates at Mu3e, Belle-II, and FCC-ee.

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