Dirac-Majorana neutrinos distinction in four-body decays
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| Format: | Preprint |
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2023
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| _version_ | 1866916118013149184 |
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| author | Márquez, Juan Manuel Portillo-Sánchez, Diego Roig, Pablo |
| author_facet | Márquez, Juan Manuel Portillo-Sánchez, Diego Roig, Pablo |
| contents | A novel method to differentiate the effects of Dirac and Majorana (D-M) neutrinos in four-body decays has been discussed in arXiv:2106.11785. There, it is concluded that the back-to-back kinematic scenario seems to avoid the constraint imposed by the "practical Dirac-Majorana confusion theorem", as one does not need to fully integrate over neutrino and antineutrino momenta. In this paper, we propose to analyse radiative leptonic lepton-decays ($\ell\to\ell'ν\barνγ$), as an independent alternative process to study the possible Majorana nature of neutrinos. Our approach demonstrates that, in the back-to-back kinematic configuration (for the $\ell'- γ$ and $ν-\barν$ systems, respectively), the distinction between Dirac and Majorana cases disappears when the inaccessible neutrino angle is integrated out, which might appear unexpected considering the claims in arXiv:2106.11785. Our results apply in absence of non-standard interactions, which can enhance generally the sensitivity to the neutrino nature. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2305_14140 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Dirac-Majorana neutrinos distinction in four-body decays Márquez, Juan Manuel Portillo-Sánchez, Diego Roig, Pablo High Energy Physics - Phenomenology A novel method to differentiate the effects of Dirac and Majorana (D-M) neutrinos in four-body decays has been discussed in arXiv:2106.11785. There, it is concluded that the back-to-back kinematic scenario seems to avoid the constraint imposed by the "practical Dirac-Majorana confusion theorem", as one does not need to fully integrate over neutrino and antineutrino momenta. In this paper, we propose to analyse radiative leptonic lepton-decays ($\ell\to\ell'ν\barνγ$), as an independent alternative process to study the possible Majorana nature of neutrinos. Our approach demonstrates that, in the back-to-back kinematic configuration (for the $\ell'- γ$ and $ν-\barν$ systems, respectively), the distinction between Dirac and Majorana cases disappears when the inaccessible neutrino angle is integrated out, which might appear unexpected considering the claims in arXiv:2106.11785. Our results apply in absence of non-standard interactions, which can enhance generally the sensitivity to the neutrino nature. |
| title | Dirac-Majorana neutrinos distinction in four-body decays |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2305.14140 |