$2νββ$ Spectrum in Chiral Effective Field Theory
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arXiv
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| Autores principales: | , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866916531164676096 |
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| author | Morabit, Saad el Bouabid, Ryan Cirigliano, Vincenzo de Vries, Jordy Gráf, Lukáš Mereghetti, Emanuele |
| author_facet | Morabit, Saad el Bouabid, Ryan Cirigliano, Vincenzo de Vries, Jordy Gráf, Lukáš Mereghetti, Emanuele |
| contents | We investigate two-neutrino double beta decay ($2νββ$) in chiral effective field theory. We find contributions from weak magnetism and double-weak pion-exchange at next-to-leading-order in the chiral power counting. We discuss the impact of the chiral corrections on the electron spectra and find that they should be included in analyses of $2νββ$ decay that aim to uncover new physics signatures in the electron spectrum. We illustrate this point by revisiting the effect of sterile neutrinos and non-standard charged interactions. We also find that the pion-exchange contributions involve nuclear matrix elements that are related to those appearing in neutrinoless double beta decay ($0νββ$). We investigate whether the $0νββ$ nuclear matrix elements can be obtained from detailed measurements of the energy spectrum of the outgoing electrons in $2νββ$ transitions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_14160 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | $2νββ$ Spectrum in Chiral Effective Field Theory Morabit, Saad el Bouabid, Ryan Cirigliano, Vincenzo de Vries, Jordy Gráf, Lukáš Mereghetti, Emanuele High Energy Physics - Phenomenology High Energy Physics - Experiment Nuclear Experiment Nuclear Theory We investigate two-neutrino double beta decay ($2νββ$) in chiral effective field theory. We find contributions from weak magnetism and double-weak pion-exchange at next-to-leading-order in the chiral power counting. We discuss the impact of the chiral corrections on the electron spectra and find that they should be included in analyses of $2νββ$ decay that aim to uncover new physics signatures in the electron spectrum. We illustrate this point by revisiting the effect of sterile neutrinos and non-standard charged interactions. We also find that the pion-exchange contributions involve nuclear matrix elements that are related to those appearing in neutrinoless double beta decay ($0νββ$). We investigate whether the $0νββ$ nuclear matrix elements can be obtained from detailed measurements of the energy spectrum of the outgoing electrons in $2νββ$ transitions. |
| title | $2νββ$ Spectrum in Chiral Effective Field Theory |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment Nuclear Experiment Nuclear Theory |
| url | https://arxiv.org/abs/2412.14160 |