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<p>We propose a search at <i>Mu3e</i> for lepton flavor violating axion(-like) particles in <i>μ</i> → 3<i>e</i> + <i>a</i> decays. By requiring an additional <i>e</i><sup>+</sup><i>e</i><sup>−</sup> pair from internal conversion, one can circumvent the calibration challenges which plague the <i>μ</i> → <i>e</i> + <i>a</i> channel for axions lighter than 20 MeV. Crucially, the corresponding reduction in signal rate is to a large extent compensated for by <i>Mu3e</i>’s ability to resolve highly collimated tracks. For phase I of <i>Mu3e</i>, we project a sensitivity to decay constants as high as 6 × 10<sup>9</sup> GeV which probes uncharted parameter space in scenarios of axion dark matter. The sensitivity to axions which couple primarily to right-handed leptons can be further improved by leveraging the polarisation of the muon beam.</p>

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A robust search for lepton flavour violating axions at Mu3e

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月24日

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  • Simon Knapen,
  • Kevin Langhoff,
  • Toby Opferkuch,
  • Diego Redigolo

摘要

We propose a search at Mu3e for lepton flavor violating axion(-like) particles in μ → 3e + a decays. By requiring an additional e+e− pair from internal conversion, one can circumvent the calibration challenges which plague the μ → e + a channel for axions lighter than 20 MeV. Crucially, the corresponding reduction in signal rate is to a large extent compensated for by Mu3e’s ability to resolve highly collimated tracks. For phase I of Mu3e, we project a sensitivity to decay constants as high as 6 × 109 GeV which probes uncharted parameter space in scenarios of axion dark matter. The sensitivity to axions which couple primarily to right-handed leptons can be further improved by leveraging the polarisation of the muon beam.