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Hunting for ALPs with Lepton Flavor Violation

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arxiv 1911.06279 v3 pith:R2FAWFDG submitted 2019-11-14 hep-ph hep-ex

classification hep-phhep-ex
keywords alpscouplingsflavorleptonprocessesaxion-likeby-productchoice
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We examine the low-energy signatures of axion-like particles (ALPs) in lepton flavor violating (LFV) processes. By using a dimension-5 effective Lagrangian, we compute the most general ALP contributions to LFV decays of leptons and mesons. The provided expressions are valid for any choice of ALP mass and couplings. We explore the complementarity of different processes, identifying specific patterns to be experimentally tested. Constraints on LFV couplings are derived from existing data and prospects for forthcoming experiments are also discussed. As a by-product, we revisit the possibility of a simultaneous explanation of the observed discrepancies in the muon and electron $g-2$ through ALP interactions.

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Forward citations

Cited by 8 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Neutron stars can shine a light on elusive lepton-flavor-violating dark matter

    hep-ph 2025-11 conditional novelty 7.0 of 10

    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.

  2. Long-lived Axion-Like Particles from Tau Decays

    hep-ph 2025-07 conditional novelty 7.0 of 10

    Leptophilic long-lived ALPs produced in tau decays are shown to yield new CHARM/BEBC constraints and improved future sensitivity, particularly at SHiP, extending reach to fa up to 10^8-10^9 GeV in LFV scenarios.

  3. ALP production in Lepton Flavour Violating meson, tau and gauge boson decays

    hep-ph 2026-04 unverdicted novelty 6.0 of 10

    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.

  4. Same-sign dimuon probe of charged lepton flavor violation at electron-photon colliders

    hep-ph 2026-03 conditional novelty 6.0 of 10

    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.

  5. Positivity and partial wave unitarity bounds on ALP theories via amplitude methods

    hep-ph 2025-10 conditional novelty 6.0 of 10

    Complete partial-wave unitarity and positivity bounds are derived for ALP effective interactions up to dimension 8, with new SMEFT positivity constraints as a byproduct.

  6. ALP and $Z^\prime$ boson at the Electron-Ion collider

    hep-ph 2026-01 conditional novelty 5.0 of 10

    Projected EIC tri-electron searches would constrain electron-coupled ALPs and Z' bosons more strongly than current experiments at masses of about 10-100 GeV and 10-30 GeV, respectively.

  7. Concurrent Exploration of Axion-Like Particle Interactions with Gauge Bosons at the LHC

    hep-ph 2025-05 conditional novelty 5.0 of 10

    Expected and observed 95% CL limits on the ALP couplings to gluons and W bosons are derived for a 1 MeV ALP, from simulated ZZa/WWa events at the HL-LHC and from recast CMS Z+jets and W+jets measurements.

  8. Axions and Axion-like particles: collider searches

    hep-ph 2025-08 accept

    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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