A robust search for lepton flavour violating axions at Mu3e
Abstract 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,...
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2025-07-01
|
| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP07(2025)243 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1849238164651114496 |
|---|---|
| author | Simon Knapen Kevin Langhoff Toby Opferkuch Diego Redigolo |
| author_facet | Simon Knapen Kevin Langhoff Toby Opferkuch Diego Redigolo |
| author_sort | Simon Knapen |
| collection | DOAJ |
| description | Abstract 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. |
| format | Article |
| id | doaj-art-a9dfefc09c684d049457c28556aea097 |
| institution | Kabale University |
| issn | 1029-8479 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj-art-a9dfefc09c684d049457c28556aea0972025-08-20T04:01:43ZengSpringerOpenJournal of High Energy Physics1029-84792025-07-012025711210.1007/JHEP07(2025)243A robust search for lepton flavour violating axions at Mu3eSimon Knapen0Kevin Langhoff1Toby Opferkuch2Diego Redigolo3Berkeley Center for Theoretical Physics, University of CaliforniaBerkeley Center for Theoretical Physics, University of CaliforniaBerkeley Center for Theoretical Physics, University of CaliforniaINFN, Sezione di FirenzeAbstract 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.https://doi.org/10.1007/JHEP07(2025)243Axions and ALPsBaryon/Lepton Number ViolationNew Light ParticlesTheories of Flavour |
| spellingShingle | Simon Knapen Kevin Langhoff Toby Opferkuch Diego Redigolo A robust search for lepton flavour violating axions at Mu3e Journal of High Energy Physics Axions and ALPs Baryon/Lepton Number Violation New Light Particles Theories of Flavour |
| title | A robust search for lepton flavour violating axions at Mu3e |
| title_full | A robust search for lepton flavour violating axions at Mu3e |
| title_fullStr | A robust search for lepton flavour violating axions at Mu3e |
| title_full_unstemmed | A robust search for lepton flavour violating axions at Mu3e |
| title_short | A robust search for lepton flavour violating axions at Mu3e |
| title_sort | robust search for lepton flavour violating axions at mu3e |
| topic | Axions and ALPs Baryon/Lepton Number Violation New Light Particles Theories of Flavour |
| url | https://doi.org/10.1007/JHEP07(2025)243 |
| work_keys_str_mv | AT simonknapen arobustsearchforleptonflavourviolatingaxionsatmu3e AT kevinlanghoff arobustsearchforleptonflavourviolatingaxionsatmu3e AT tobyopferkuch arobustsearchforleptonflavourviolatingaxionsatmu3e AT diegoredigolo arobustsearchforleptonflavourviolatingaxionsatmu3e AT simonknapen robustsearchforleptonflavourviolatingaxionsatmu3e AT kevinlanghoff robustsearchforleptonflavourviolatingaxionsatmu3e AT tobyopferkuch robustsearchforleptonflavourviolatingaxionsatmu3e AT diegoredigolo robustsearchforleptonflavourviolatingaxionsatmu3e |