Michel parameters in the presence of massive Dirac and Majorana neutrinos
Abstract We analyse the effects of Dirac and Majorana neutrinos on leptonic decays of muon and tau leptons using the most general four-lepton effective interaction Hamiltonian of dimension six. We calculate the specific energy and angular distribution of the final charged lepton, including the polar...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2022-11-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP11(2022)117 |
| _version_ | 1797865718680649728 |
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| author | Juan Manuel Márquez Gabriel López Castro Pablo Roig |
| author_facet | Juan Manuel Márquez Gabriel López Castro Pablo Roig |
| author_sort | Juan Manuel Márquez |
| collection | DOAJ |
| description | Abstract We analyse the effects of Dirac and Majorana neutrinos on leptonic decays of muon and tau leptons using the most general four-lepton effective interaction Hamiltonian of dimension six. We calculate the specific energy and angular distribution of the final charged lepton, including the polarizations of the initial and final charged leptons. We discuss the new generalized Michel parameters and focus on the effects of the heavy neutrino masses that would lead to sizable contributions on scenarios where the new sterile neutrinos have non-negligible mixing. Specifically, the most promising scenario is found for the case of τ decay with one heavy final-state neutrino with a mass around 102 − 103 MeV, where the linear term suppression could be of order 10 −4, low enough to be measured in current and forthcoming experiments. |
| first_indexed | 2024-04-09T23:12:40Z |
| format | Article |
| id | doaj.art-0e34e1b0e19445eca31404e2ac84a4b1 |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-04-09T23:12:40Z |
| publishDate | 2022-11-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-0e34e1b0e19445eca31404e2ac84a4b12023-03-22T10:15:45ZengSpringerOpenJournal of High Energy Physics1029-84792022-11-0120221113810.1007/JHEP11(2022)117Michel parameters in the presence of massive Dirac and Majorana neutrinosJuan Manuel Márquez0Gabriel López Castro1Pablo Roig2Departamento de Física, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico NacionalDepartamento de Física, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico NacionalDepartamento de Física, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico NacionalAbstract We analyse the effects of Dirac and Majorana neutrinos on leptonic decays of muon and tau leptons using the most general four-lepton effective interaction Hamiltonian of dimension six. We calculate the specific energy and angular distribution of the final charged lepton, including the polarizations of the initial and final charged leptons. We discuss the new generalized Michel parameters and focus on the effects of the heavy neutrino masses that would lead to sizable contributions on scenarios where the new sterile neutrinos have non-negligible mixing. Specifically, the most promising scenario is found for the case of τ decay with one heavy final-state neutrino with a mass around 102 − 103 MeV, where the linear term suppression could be of order 10 −4, low enough to be measured in current and forthcoming experiments.https://doi.org/10.1007/JHEP11(2022)117Electroweak Precision PhysicsSterile or Heavy Neutrinos |
| spellingShingle | Juan Manuel Márquez Gabriel López Castro Pablo Roig Michel parameters in the presence of massive Dirac and Majorana neutrinos Journal of High Energy Physics Electroweak Precision Physics Sterile or Heavy Neutrinos |
| title | Michel parameters in the presence of massive Dirac and Majorana neutrinos |
| title_full | Michel parameters in the presence of massive Dirac and Majorana neutrinos |
| title_fullStr | Michel parameters in the presence of massive Dirac and Majorana neutrinos |
| title_full_unstemmed | Michel parameters in the presence of massive Dirac and Majorana neutrinos |
| title_short | Michel parameters in the presence of massive Dirac and Majorana neutrinos |
| title_sort | michel parameters in the presence of massive dirac and majorana neutrinos |
| topic | Electroweak Precision Physics Sterile or Heavy Neutrinos |
| url | https://doi.org/10.1007/JHEP11(2022)117 |
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