Neutrino masses from low scale partial compositeness
Abstract We consider a class of models in which the neutrinos acquire Majorana masses through mixing with singlet neutrinos that emerge as composite states of a strongly coupled hidden sector. In this framework, the light neutrinos are partially composite particles that obtain their masses through t...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2021-03-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP03(2021)112 |
| _version_ | 1818590491572174848 |
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| author | Zackaria Chacko Patrick J. Fox Roni Harnik Zhen Liu |
| author_facet | Zackaria Chacko Patrick J. Fox Roni Harnik Zhen Liu |
| author_sort | Zackaria Chacko |
| collection | DOAJ |
| description | Abstract We consider a class of models in which the neutrinos acquire Majorana masses through mixing with singlet neutrinos that emerge as composite states of a strongly coupled hidden sector. In this framework, the light neutrinos are partially composite particles that obtain their masses through the inverse seesaw mechanism. We focus on the scenario in which the strong dynamics is approximately conformal in the ultraviolet, and the compositeness scale lies at or below the weak scale. The small parameters in the Lagrangian necessary to realize the observed neutrino masses can naturally arise as a consequence of the scaling dimensions of operators in the conformal field theory. We show that this class of models has interesting implications for a wide variety of experiments, including colliders and beam dumps, searches for lepton flavor violation and neutrinoless double beta decay, and cosmological observations. At colliders and beam dumps, this scenario can give rise to striking signals involving multiple displaced vertices. The exchange of hidden sector states can lead to observable rates for flavor violating processes such as μ → eγ and μ → e conversion. If the compositeness scale lies at or below a hundred MeV, the rate for neutrinoless double beta decay is suppressed by form factors and may be reduced by an order of magnitude or more. The late decays of relic singlet neutrinos can give rise to spectral distortions in the cosmic microwave background that are large enough to be observed in future experiments. |
| first_indexed | 2024-12-16T09:57:23Z |
| format | Article |
| id | doaj.art-979d1783840841fabeba84a0361f337d |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-12-16T09:57:23Z |
| publishDate | 2021-03-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-979d1783840841fabeba84a0361f337d2022-12-21T22:35:53ZengSpringerOpenJournal of High Energy Physics1029-84792021-03-012021314610.1007/JHEP03(2021)112Neutrino masses from low scale partial compositenessZackaria Chacko0Patrick J. Fox1Roni Harnik2Zhen Liu3Maryland Center for Fundamental Physics, Department of Physics, University of MarylandTheoretical Physics Department, FermilabTheoretical Physics Department, FermilabMaryland Center for Fundamental Physics, Department of Physics, University of MarylandAbstract We consider a class of models in which the neutrinos acquire Majorana masses through mixing with singlet neutrinos that emerge as composite states of a strongly coupled hidden sector. In this framework, the light neutrinos are partially composite particles that obtain their masses through the inverse seesaw mechanism. We focus on the scenario in which the strong dynamics is approximately conformal in the ultraviolet, and the compositeness scale lies at or below the weak scale. The small parameters in the Lagrangian necessary to realize the observed neutrino masses can naturally arise as a consequence of the scaling dimensions of operators in the conformal field theory. We show that this class of models has interesting implications for a wide variety of experiments, including colliders and beam dumps, searches for lepton flavor violation and neutrinoless double beta decay, and cosmological observations. At colliders and beam dumps, this scenario can give rise to striking signals involving multiple displaced vertices. The exchange of hidden sector states can lead to observable rates for flavor violating processes such as μ → eγ and μ → e conversion. If the compositeness scale lies at or below a hundred MeV, the rate for neutrinoless double beta decay is suppressed by form factors and may be reduced by an order of magnitude or more. The late decays of relic singlet neutrinos can give rise to spectral distortions in the cosmic microwave background that are large enough to be observed in future experiments.https://doi.org/10.1007/JHEP03(2021)112Beyond Standard ModelNeutrino PhysicsTechnicolor and Composite Models |
| spellingShingle | Zackaria Chacko Patrick J. Fox Roni Harnik Zhen Liu Neutrino masses from low scale partial compositeness Journal of High Energy Physics Beyond Standard Model Neutrino Physics Technicolor and Composite Models |
| title | Neutrino masses from low scale partial compositeness |
| title_full | Neutrino masses from low scale partial compositeness |
| title_fullStr | Neutrino masses from low scale partial compositeness |
| title_full_unstemmed | Neutrino masses from low scale partial compositeness |
| title_short | Neutrino masses from low scale partial compositeness |
| title_sort | neutrino masses from low scale partial compositeness |
| topic | Beyond Standard Model Neutrino Physics Technicolor and Composite Models |
| url | https://doi.org/10.1007/JHEP03(2021)112 |
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