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Probing $e\mu$ flavor-violating ALP at Belle II
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Recently, it was pointed out that the electron and muon g-2 discrepancies can be explained simultaneously by a flavor-violating axion-like particle (ALP). We show that the parameter regions favored by the muon g-2 are already excluded by the muonium-antimuonium oscillation bound. In contrast, those for the electron g-2 can be consistent with this bound when the ALP is heavier than 1.5 GeV. We propose to search for a signature of the same-sign and same-flavor lepton pairs and the forward-backward muon asymmetry to test the model at the Belle II experiment.
Forward citations
Cited by 6 Pith papers
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Neutron stars can shine a light on elusive lepton-flavor-violating dark matter
Flavor blocking keeps lepton-flavor-violating dark matter from thermalizing inside neutron stars, so p-wave annihilation stays efficient and heats the star to observable temperatures.
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ALP production in Lepton Flavour Violating meson, tau and gauge boson decays
ALPs with LFV couplings above the muon mass threshold can be produced in LFV meson, tau, and gauge boson decays, yielding clean eμ signatures that enable new searches at future experiments.
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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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Same-sign dimuon probe of charged lepton flavor violation at electron-photon colliders
Electron–photon collisions are shown to probe axionlike-particle e–mu flavor-violating couplings via a same-sign dimuon signature, with projected sensitivity one to two orders below current bounds.
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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 mor...
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Axions and Axion-like particles: collider searches
A pedagogical review of the ALP effective field theory, production and decay at colliders, indirect search strategies, and a summary of current bounds on the ALP-photon coupling.
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