Neutrinoless double beta decay rates and the $3 + 2$ scenario
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866916754776653824 |
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| author | Plakkot, Vaisakh |
| author_facet | Plakkot, Vaisakh |
| contents | The possible Majorana nature of neutrinos leads to lepton-number-violating effects such as neutrinoless double beta decay. The standard study of this process involves mass-dependent matrix elements which, although easy to use, might be missing important effects, especially in the light neutrino regime where the ultrasoft contributions become important. A fresh look at the different momentum regions leads us to an effective practical parametrisation for the decay amplitude that can show significant differences in the light-to-medium mass range of neutrinos compared to the standard parametrisation. As a concrete realisation of a UV model leading to Majorana neutrinos, the testability of a $3 + 2$ model with two sterile neutrinos is discussed. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_17750 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Neutrinoless double beta decay rates and the $3 + 2$ scenario Plakkot, Vaisakh High Energy Physics - Phenomenology The possible Majorana nature of neutrinos leads to lepton-number-violating effects such as neutrinoless double beta decay. The standard study of this process involves mass-dependent matrix elements which, although easy to use, might be missing important effects, especially in the light neutrino regime where the ultrasoft contributions become important. A fresh look at the different momentum regions leads us to an effective practical parametrisation for the decay amplitude that can show significant differences in the light-to-medium mass range of neutrinos compared to the standard parametrisation. As a concrete realisation of a UV model leading to Majorana neutrinos, the testability of a $3 + 2$ model with two sterile neutrinos is discussed. |
| title | Neutrinoless double beta decay rates and the $3 + 2$ scenario |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2505.17750 |