Ab initio short-range nuclear matrix elements for neutrinoless double-beta decay
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866913059328491520 |
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| author | Todd, A. Shickele, T. Belley, A. Jokiniemi, L. Holt, J. D. |
| author_facet | Todd, A. Shickele, T. Belley, A. Jokiniemi, L. Holt, J. D. |
| contents | We present converged ab initio calculations of short-range neutrinoless double-beta ($0νββ$) decay nuclear matrix elements for the key experimental isotopes $^{76}$Ge, $^{82}$Se, $^{130}$Te and $^{136}$Xe. Starting from different nuclear forces derived from chiral effective field theory, we apply the in-medium similarity renormalization group to obtain an effective valence-space Hamiltonian along with consistently transformed $0νββ$-decay operators. We then obtain a range of values for the matrix elements that is consistent with, but generally smaller than, those from phenomenology. Finally, we combine our results with current limits from $0νββ$-decay searches to obtain constraints for the sterile-neutrino mixing-mass parameter space when considering the inclusion of a fourth sterile neutrino. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2604_22727 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Ab initio short-range nuclear matrix elements for neutrinoless double-beta decay Todd, A. Shickele, T. Belley, A. Jokiniemi, L. Holt, J. D. Nuclear Theory We present converged ab initio calculations of short-range neutrinoless double-beta ($0νββ$) decay nuclear matrix elements for the key experimental isotopes $^{76}$Ge, $^{82}$Se, $^{130}$Te and $^{136}$Xe. Starting from different nuclear forces derived from chiral effective field theory, we apply the in-medium similarity renormalization group to obtain an effective valence-space Hamiltonian along with consistently transformed $0νββ$-decay operators. We then obtain a range of values for the matrix elements that is consistent with, but generally smaller than, those from phenomenology. Finally, we combine our results with current limits from $0νββ$-decay searches to obtain constraints for the sterile-neutrino mixing-mass parameter space when considering the inclusion of a fourth sterile neutrino. |
| title | Ab initio short-range nuclear matrix elements for neutrinoless double-beta decay |
| topic | Nuclear Theory |
| url | https://arxiv.org/abs/2604.22727 |