Tentative sensitivity of future 0νββ-decay experiments to neutrino masses and Majorana CP phases
Abstract In the near future, the neutrinoless double-beta (0νββ) decay experiments will hopefully reach the sensitivity of a few meV to the effective neutrino mass |m ββ |. In this paper, we tentatively examine the sensitivity of future 0νββ-decay experiments to neutrino masses and Majorana CP phase...
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| Format: | Article |
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SpringerOpen
2021-03-01
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| Series: | Journal of High Energy Physics |
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| Online Access: | https://doi.org/10.1007/JHEP03(2021)084 |
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| author | Guo-yuan Huang Shun Zhou |
| author_facet | Guo-yuan Huang Shun Zhou |
| author_sort | Guo-yuan Huang |
| collection | DOAJ |
| description | Abstract In the near future, the neutrinoless double-beta (0νββ) decay experiments will hopefully reach the sensitivity of a few meV to the effective neutrino mass |m ββ |. In this paper, we tentatively examine the sensitivity of future 0νββ-decay experiments to neutrino masses and Majorana CP phases by following the Bayesian statistical approach. Provided experimental setups corresponding to the experimental sensitivity of |m ββ | ≃ 1 meV, the null observation of 0νββ decays in the case of normal neutrino mass ordering leads to a very competitive bound on the lightest neutrino mass m 1. Namely, the 95% credible interval in the Bayesian approach turns out to be 1.6 meV ≲ m 1 ≲ 7.3 meV or 0.3 meV ≲ m 1 ≲ 5.6 meV when the uniform prior on m 1 /eV or on log10(m 1 /eV) is adopted. Moreover, one of two Majorana CP phases is strictly constrained, i.e., 140° ≲ ρ ≲ 220° for both scenarios of prior distributions of m 1. In contrast, if a relatively worse experimental sensitivity of |m ββ | ≃ 10 meV is assumed, the constraint on the lightest neutrino mass becomes accordingly 0.6 meV ≲ m 1 ≲ 26 meV or 0 ≲ m 1 ≲ 6.1 meV, while two Majorana CP phases will be essentially unconstrained. In the same statistical framework, the prospects for the determination of neutrino mass ordering and the discrimination between Majorana and Dirac nature of massive neutrinos in the 0νββ-decay experiments are also discussed. Given the experimental sensitivity of |m ββ | ≃ 10 meV (or 1 meV), the strength of evidence to exclude the Majorana nature under the null observation of 0νββ decays is found to be inconclusive (or strong), no matter which of two priors on m 1 is taken. |
| first_indexed | 2024-12-22T11:56:01Z |
| format | Article |
| id | doaj.art-0c25d00dfa0e495ba9b494d04e42ea64 |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-12-22T11:56:01Z |
| publishDate | 2021-03-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-0c25d00dfa0e495ba9b494d04e42ea642022-12-21T18:26:47ZengSpringerOpenJournal of High Energy Physics1029-84792021-03-012021311710.1007/JHEP03(2021)084Tentative sensitivity of future 0νββ-decay experiments to neutrino masses and Majorana CP phasesGuo-yuan Huang0Shun Zhou1Max-Planck-Institut für KernphysikInstitute of High Energy Physics, Chinese Academy of SciencesAbstract In the near future, the neutrinoless double-beta (0νββ) decay experiments will hopefully reach the sensitivity of a few meV to the effective neutrino mass |m ββ |. In this paper, we tentatively examine the sensitivity of future 0νββ-decay experiments to neutrino masses and Majorana CP phases by following the Bayesian statistical approach. Provided experimental setups corresponding to the experimental sensitivity of |m ββ | ≃ 1 meV, the null observation of 0νββ decays in the case of normal neutrino mass ordering leads to a very competitive bound on the lightest neutrino mass m 1. Namely, the 95% credible interval in the Bayesian approach turns out to be 1.6 meV ≲ m 1 ≲ 7.3 meV or 0.3 meV ≲ m 1 ≲ 5.6 meV when the uniform prior on m 1 /eV or on log10(m 1 /eV) is adopted. Moreover, one of two Majorana CP phases is strictly constrained, i.e., 140° ≲ ρ ≲ 220° for both scenarios of prior distributions of m 1. In contrast, if a relatively worse experimental sensitivity of |m ββ | ≃ 10 meV is assumed, the constraint on the lightest neutrino mass becomes accordingly 0.6 meV ≲ m 1 ≲ 26 meV or 0 ≲ m 1 ≲ 6.1 meV, while two Majorana CP phases will be essentially unconstrained. In the same statistical framework, the prospects for the determination of neutrino mass ordering and the discrimination between Majorana and Dirac nature of massive neutrinos in the 0νββ-decay experiments are also discussed. Given the experimental sensitivity of |m ββ | ≃ 10 meV (or 1 meV), the strength of evidence to exclude the Majorana nature under the null observation of 0νββ decays is found to be inconclusive (or strong), no matter which of two priors on m 1 is taken.https://doi.org/10.1007/JHEP03(2021)084Neutrino PhysicsBeyond Standard Model |
| spellingShingle | Guo-yuan Huang Shun Zhou Tentative sensitivity of future 0νββ-decay experiments to neutrino masses and Majorana CP phases Journal of High Energy Physics Neutrino Physics Beyond Standard Model |
| title | Tentative sensitivity of future 0νββ-decay experiments to neutrino masses and Majorana CP phases |
| title_full | Tentative sensitivity of future 0νββ-decay experiments to neutrino masses and Majorana CP phases |
| title_fullStr | Tentative sensitivity of future 0νββ-decay experiments to neutrino masses and Majorana CP phases |
| title_full_unstemmed | Tentative sensitivity of future 0νββ-decay experiments to neutrino masses and Majorana CP phases |
| title_short | Tentative sensitivity of future 0νββ-decay experiments to neutrino masses and Majorana CP phases |
| title_sort | tentative sensitivity of future 0νββ decay experiments to neutrino masses and majorana cp phases |
| topic | Neutrino Physics Beyond Standard Model |
| url | https://doi.org/10.1007/JHEP03(2021)084 |
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