Lepton flavor violating decay of true muonium: $\boldsymbol{(μ^+ μ^-) \to μ^\pm e^\mp}$
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866918116345249792 |
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| author | Minato, Ryotaro Sato, Akira Suda, Ryosuke Yamanaka, Masato |
| author_facet | Minato, Ryotaro Sato, Akira Suda, Ryosuke Yamanaka, Masato |
| contents | We propose a new channel for probing charged lepton flavor violation (CLFV): the decay of true muonium into a lepton pair of different flavor, $(μ^+ μ^-) \to μ^\pm e^\mp$. This purely leptonic two-body decay provides a clean experimental signature in the form of energetic, oppositely charged leptons. It is sensitive not only to photonic dipole interactions but also to four-fermion contact interactions, and is free from hadronic uncertainties in theoretical predictions. We evaluate the branching ratios induced by scalar-, vector-, and dipole-type CLFV operators. Our results show that the branching ratio can reach up to $\mathcal{O}(10^{-20})$ within current experimental bounds. This decay mode may be discovered as an early-stage physics opportunity of the muon collider program by utilizing the large number of muons produced at its front end. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_01193 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Lepton flavor violating decay of true muonium: $\boldsymbol{(μ^+ μ^-) \to μ^\pm e^\mp}$ Minato, Ryotaro Sato, Akira Suda, Ryosuke Yamanaka, Masato High Energy Physics - Phenomenology We propose a new channel for probing charged lepton flavor violation (CLFV): the decay of true muonium into a lepton pair of different flavor, $(μ^+ μ^-) \to μ^\pm e^\mp$. This purely leptonic two-body decay provides a clean experimental signature in the form of energetic, oppositely charged leptons. It is sensitive not only to photonic dipole interactions but also to four-fermion contact interactions, and is free from hadronic uncertainties in theoretical predictions. We evaluate the branching ratios induced by scalar-, vector-, and dipole-type CLFV operators. Our results show that the branching ratio can reach up to $\mathcal{O}(10^{-20})$ within current experimental bounds. This decay mode may be discovered as an early-stage physics opportunity of the muon collider program by utilizing the large number of muons produced at its front end. |
| title | Lepton flavor violating decay of true muonium: $\boldsymbol{(μ^+ μ^-) \to μ^\pm e^\mp}$ |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2507.01193 |