Testable leptogenesis and $0νββ$ decay in extended seesaw model
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| Format: | Preprint |
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2024
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| _version_ | 1866912073856843776 |
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| author | Li, Gang Ramsey-Musolf, Michael J. Senapati, Supriya Quiroga, Sebastián Urrutia |
| author_facet | Li, Gang Ramsey-Musolf, Michael J. Senapati, Supriya Quiroga, Sebastián Urrutia |
| contents | We investigate the possibility of observable neutrinoless double beta decay $( 0 νββ)$ and viable leptogenesis within a low-scale extended inverse seesaw mechanism with additional sterile neutrinos. General effective field theory (EFT) considerations suggest that if there are experimentally observable signatures in $0 νββ$-decay and a lepton asymmetry generated by heavy right-handed neutrino decays, thermal leptogenesis is likely to be unviable. However, in this work, we show that in the context of low-scale leptogenesis, one can obtain the observed baryon asymmetry of the universe and observable signatures of $0 νββ$ decay in the presence of additional sterile neutrinos. In this framework, the light neutrino masses are suppressed by the extended seesaw parameter, $μ$, thereby allowing for $\mathcal{O}(10\, \mathrm{TeV})$ right-handed (RH) neutrinos, while avoiding small Yukawa couplings as in other neutrino mass models and near degeneracies in the RH neutrino spectrum as required by the low-scale leptogenesis paradigm. Contributions to the $0 νββ$-decay rate from additional sterile neutrinos can be appreciable, while the corresponding contributions to the early universe lepton asymmetry washout rate are suppressed by other parameters not entering the $0 νββ$-decay amplitudes. We show that for keV-MeV scale, sterile neutrinos future ton-scale $0νββ$-decay experiments offer potential signals while maintaining viable leptogenesis. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2410_12180 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Testable leptogenesis and $0νββ$ decay in extended seesaw model Li, Gang Ramsey-Musolf, Michael J. Senapati, Supriya Quiroga, Sebastián Urrutia High Energy Physics - Phenomenology Nuclear Theory We investigate the possibility of observable neutrinoless double beta decay $( 0 νββ)$ and viable leptogenesis within a low-scale extended inverse seesaw mechanism with additional sterile neutrinos. General effective field theory (EFT) considerations suggest that if there are experimentally observable signatures in $0 νββ$-decay and a lepton asymmetry generated by heavy right-handed neutrino decays, thermal leptogenesis is likely to be unviable. However, in this work, we show that in the context of low-scale leptogenesis, one can obtain the observed baryon asymmetry of the universe and observable signatures of $0 νββ$ decay in the presence of additional sterile neutrinos. In this framework, the light neutrino masses are suppressed by the extended seesaw parameter, $μ$, thereby allowing for $\mathcal{O}(10\, \mathrm{TeV})$ right-handed (RH) neutrinos, while avoiding small Yukawa couplings as in other neutrino mass models and near degeneracies in the RH neutrino spectrum as required by the low-scale leptogenesis paradigm. Contributions to the $0 νββ$-decay rate from additional sterile neutrinos can be appreciable, while the corresponding contributions to the early universe lepton asymmetry washout rate are suppressed by other parameters not entering the $0 νββ$-decay amplitudes. We show that for keV-MeV scale, sterile neutrinos future ton-scale $0νββ$-decay experiments offer potential signals while maintaining viable leptogenesis. |
| title | Testable leptogenesis and $0νββ$ decay in extended seesaw model |
| topic | High Energy Physics - Phenomenology Nuclear Theory |
| url | https://arxiv.org/abs/2410.12180 |