Kavli Affiliate: Gordan Krnjaic
| Summary:
We propose a dark matter direct-detection strategy using charged particle decays at accelerator-based experiments. If ultralight $(m_φll texteV)$ 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 $μto e φ’$ and $τto e(μ)φ’$ 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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