Above the muon threshold, LFV ALP production in K, D_s, W, Z, J/ψ and τ decays gives new prompt and displaced search channels with projected reach up to f_a ≈ 10^8 GeV.
Willmannet al., Phys
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In a simplified ALP model with flavor-violating e-μ couplings, constraints from Δa_e, μ→3e, and other processes limit the branching ratio of μ⁻e⁻→e⁻e⁻ in aluminum muonic atoms to O(10^{-20}), with resonant regions more suppressed.
A review summarizing recent progress in high-intensity polarized muon beams for precision muonium physics, new physics searches, and materials science applications.
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ALP production in Lepton Flavour Violating meson, tau and gauge boson decays
Above the muon threshold, LFV ALP production in K, D_s, W, Z, J/ψ and τ decays gives new prompt and displaced search channels with projected reach up to f_a ≈ 10^8 GeV.
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Axion-like Particles and Lepton Flavor Violation in Muonic Atoms
In a simplified ALP model with flavor-violating e-μ couplings, constraints from Δa_e, μ→3e, and other processes limit the branching ratio of μ⁻e⁻→e⁻e⁻ in aluminum muonic atoms to O(10^{-20}), with resonant regions more suppressed.
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Muon beams towards muonium physics: progress and prospects
A review summarizing recent progress in high-intensity polarized muon beams for precision muonium physics, new physics searches, and materials science applications.