Abstract
Recently, it was pointed out that the electron and muon g − 2 discrepancies can be explained simultaneously by a single 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.
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Endo, M., Iguro, S. & Kitahara, T. Probing eμ flavor-violating ALP at Belle II. J. High Energ. Phys. 2020, 40 (2020). https://doi.org/10.1007/JHEP06(2020)040
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DOI: https://doi.org/10.1007/JHEP06(2020)040