Amplifying muon-to-positron conversion in nuclei with ultralight dark matter
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arXiv
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| Autores principales: | , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866915966413176832 |
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| author | Sahu, Purushottam Sen, Manibrata |
| author_facet | Sahu, Purushottam Sen, Manibrata |
| contents | We present an analysis of the lepton-number and lepton-flavour-violating process of muon-to-positron conversion $μ^- + N \rightarrow e^+ + N'$, in the presence of an ultralight scalar dark matter (ULSDM) field which couples to neutrinos. The ULSDM contributes to the effective off-diagonal Majorana mass $ m_{μe}$, therefore amplifying the rate of muon-to-positron conversion to experimentally observable levels. Using existing bounds from SINDRUM II, COMET, and Mu2e experiments, we derive novel constraints on the flavour-off-diagonal couplings of neutrinos to ULSDM. Our work reveals that upcoming experiments can provide stronger sensitivity to these new couplings than bounds arising from cosmological surveys and terrestrial experiments. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_07176 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Amplifying muon-to-positron conversion in nuclei with ultralight dark matter Sahu, Purushottam Sen, Manibrata High Energy Physics - Phenomenology Nuclear Theory We present an analysis of the lepton-number and lepton-flavour-violating process of muon-to-positron conversion $μ^- + N \rightarrow e^+ + N'$, in the presence of an ultralight scalar dark matter (ULSDM) field which couples to neutrinos. The ULSDM contributes to the effective off-diagonal Majorana mass $ m_{μe}$, therefore amplifying the rate of muon-to-positron conversion to experimentally observable levels. Using existing bounds from SINDRUM II, COMET, and Mu2e experiments, we derive novel constraints on the flavour-off-diagonal couplings of neutrinos to ULSDM. Our work reveals that upcoming experiments can provide stronger sensitivity to these new couplings than bounds arising from cosmological surveys and terrestrial experiments. |
| title | Amplifying muon-to-positron conversion in nuclei with ultralight dark matter |
| topic | High Energy Physics - Phenomenology Nuclear Theory |
| url | https://arxiv.org/abs/2507.07176 |