A Frequentist analysis of three right-handed neutrinos with GAMBIT
Abstract The extension of the Standard Model by right-handed neutrinos can not only explain the active neutrino masses via the seesaw mechanism, it is also able solve a number of long standing problems in cosmology. Especially, masses below the TeV scale are of particular interest as they can lead t...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2020-06-01
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| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | http://link.springer.com/article/10.1140/epjc/s10052-020-8073-9 |
| _version_ | 1818283871989399552 |
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| author | Marcin Chrzaszcz Marco Drewes Tomás E. Gonzalo Julia Harz Suraj Krishnamurthy Christoph Weniger |
| author_facet | Marcin Chrzaszcz Marco Drewes Tomás E. Gonzalo Julia Harz Suraj Krishnamurthy Christoph Weniger |
| author_sort | Marcin Chrzaszcz |
| collection | DOAJ |
| description | Abstract The extension of the Standard Model by right-handed neutrinos can not only explain the active neutrino masses via the seesaw mechanism, it is also able solve a number of long standing problems in cosmology. Especially, masses below the TeV scale are of particular interest as they can lead to a plethora of signatures in experimental searches. We present the first full frequentist analysis of the extension of the Standard Model by three right-handed neutrinos, with masses between 60 MeV and 500 GeV, using the Global and Modular BSM (beyond the Standard Model) Inference Tool GAMBIT. Our analysis is based on the Casas-Ibarra parametrisation and includes a large range of experimental constraints: active neutrino mixing, indirect constraints from, e.g., electroweak precision observables and lepton universality, and numerous direct searches for right-handed neutrinos. To study their overall effect, we derive combined profile likelihood results for the phenomenologically most relevant parameter projections. Furthermore, we discuss the role of (marginally) statistically preferred regions in the parameter space. Finally, we explore the flavour mixing pattern of the three right-handed neutrinos for different values of the lightest neutrino mass. Our results comprise the most comprehensive assessment of the model with three right-handed neutrinos model below the TeV scale so far, and provide a robust ground for exploring the impact of future constraints or detections. |
| first_indexed | 2024-12-13T00:43:48Z |
| format | Article |
| id | doaj.art-27acbc81b9dd4eb79092f4e0b717d5b5 |
| institution | Directory Open Access Journal |
| issn | 1434-6044 1434-6052 |
| language | English |
| last_indexed | 2024-12-13T00:43:48Z |
| publishDate | 2020-06-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | European Physical Journal C: Particles and Fields |
| spelling | doaj.art-27acbc81b9dd4eb79092f4e0b717d5b52022-12-22T00:05:05ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60441434-60522020-06-0180615210.1140/epjc/s10052-020-8073-9A Frequentist analysis of three right-handed neutrinos with GAMBITMarcin Chrzaszcz0Marco Drewes1Tomás E. Gonzalo2Julia Harz3Suraj Krishnamurthy4Christoph Weniger5European Organization for Nuclear Research (CERN)Centre for Cosmology, Particle Physics and Phenomenology, Université catholique de LouvainSchool of Physics and Astronomy, Monash UniversityPhysik Department T70, Technische Universität MünchenGRAPPA, Institute of Physics, University of AmsterdamGRAPPA, Institute of Physics, University of AmsterdamAbstract The extension of the Standard Model by right-handed neutrinos can not only explain the active neutrino masses via the seesaw mechanism, it is also able solve a number of long standing problems in cosmology. Especially, masses below the TeV scale are of particular interest as they can lead to a plethora of signatures in experimental searches. We present the first full frequentist analysis of the extension of the Standard Model by three right-handed neutrinos, with masses between 60 MeV and 500 GeV, using the Global and Modular BSM (beyond the Standard Model) Inference Tool GAMBIT. Our analysis is based on the Casas-Ibarra parametrisation and includes a large range of experimental constraints: active neutrino mixing, indirect constraints from, e.g., electroweak precision observables and lepton universality, and numerous direct searches for right-handed neutrinos. To study their overall effect, we derive combined profile likelihood results for the phenomenologically most relevant parameter projections. Furthermore, we discuss the role of (marginally) statistically preferred regions in the parameter space. Finally, we explore the flavour mixing pattern of the three right-handed neutrinos for different values of the lightest neutrino mass. Our results comprise the most comprehensive assessment of the model with three right-handed neutrinos model below the TeV scale so far, and provide a robust ground for exploring the impact of future constraints or detections.http://link.springer.com/article/10.1140/epjc/s10052-020-8073-9 |
| spellingShingle | Marcin Chrzaszcz Marco Drewes Tomás E. Gonzalo Julia Harz Suraj Krishnamurthy Christoph Weniger A Frequentist analysis of three right-handed neutrinos with GAMBIT European Physical Journal C: Particles and Fields |
| title | A Frequentist analysis of three right-handed neutrinos with GAMBIT |
| title_full | A Frequentist analysis of three right-handed neutrinos with GAMBIT |
| title_fullStr | A Frequentist analysis of three right-handed neutrinos with GAMBIT |
| title_full_unstemmed | A Frequentist analysis of three right-handed neutrinos with GAMBIT |
| title_short | A Frequentist analysis of three right-handed neutrinos with GAMBIT |
| title_sort | frequentist analysis of three right handed neutrinos with gambit |
| url | http://link.springer.com/article/10.1140/epjc/s10052-020-8073-9 |
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