Neutrinoless Double Beta Decay without Vacuum Majorana Neutrino Mass
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866910551326588928 |
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| author | Gráf, Lukáš Jana, Sudip Scholer, Oliver Volmer, Nele |
| author_facet | Gráf, Lukáš Jana, Sudip Scholer, Oliver Volmer, Nele |
| contents | We present a proof-of-concept extension to the Standard Model that can generate a non-vanishing neutrinoless double beta decay ($0νββ$) signal without the existence of Majorana neutrinos or lepton number violation in the zero-density vacuum-ground-state Lagrangian. We propose that the $0νββ$ can be induced by the capture of an ultralight scalar field, a potential dark matter candidate, that carries two units of lepton number. This makes the observable $0νββ$ spectrum indistinguishable from the usual $0νββ$ mechanisms by any practical means. We find that a non-zero $0νββ$ rate does not require neutrinos to be fundamentally Majorana particles. However, for sizeable decay rates within the range of next-generation experiments, the neutrino will, generally, acquire an (effective) Majorana mass as the scalar field undergoes a transition to the Bose-Einstein condensate phase. We also discuss the distinction between the aforementioned scenario and the case in which the emission of a lepton-number-two scalar leads to $0νββ$, exhibiting discernible qualitative features that make it experimentally distinguishable from the conventional scenario. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_15016 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Neutrinoless Double Beta Decay without Vacuum Majorana Neutrino Mass Gráf, Lukáš Jana, Sudip Scholer, Oliver Volmer, Nele High Energy Physics - Phenomenology High Energy Physics - Experiment Nuclear Theory We present a proof-of-concept extension to the Standard Model that can generate a non-vanishing neutrinoless double beta decay ($0νββ$) signal without the existence of Majorana neutrinos or lepton number violation in the zero-density vacuum-ground-state Lagrangian. We propose that the $0νββ$ can be induced by the capture of an ultralight scalar field, a potential dark matter candidate, that carries two units of lepton number. This makes the observable $0νββ$ spectrum indistinguishable from the usual $0νββ$ mechanisms by any practical means. We find that a non-zero $0νββ$ rate does not require neutrinos to be fundamentally Majorana particles. However, for sizeable decay rates within the range of next-generation experiments, the neutrino will, generally, acquire an (effective) Majorana mass as the scalar field undergoes a transition to the Bose-Einstein condensate phase. We also discuss the distinction between the aforementioned scenario and the case in which the emission of a lepton-number-two scalar leads to $0νββ$, exhibiting discernible qualitative features that make it experimentally distinguishable from the conventional scenario. |
| title | Neutrinoless Double Beta Decay without Vacuum Majorana Neutrino Mass |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment Nuclear Theory |
| url | https://arxiv.org/abs/2312.15016 |