Updated global analysis of neutrino oscillations in the presence of eV-scale sterile neutrinos
Abstract We discuss the possibility to explain the anomalies in short-baseline neutrino oscillation experiments in terms of sterile neutrinos. We work in a 3 + 1 framework and pay special attention to recent new data from reactor experiments, IceCube and MINOS+. We find that results from the DANSS a...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2018-08-01
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| Series: | Journal of High Energy Physics |
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| Online Access: | http://link.springer.com/article/10.1007/JHEP08(2018)010 |
| _version_ | 1817977595422048256 |
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| author | Mona Dentler Álvaro Hernández-Cabezudo Joachim Kopp Pedro Machado Michele Maltoni Ivan Martinez-Soler Thomas Schwetz |
| author_facet | Mona Dentler Álvaro Hernández-Cabezudo Joachim Kopp Pedro Machado Michele Maltoni Ivan Martinez-Soler Thomas Schwetz |
| author_sort | Mona Dentler |
| collection | DOAJ |
| description | Abstract We discuss the possibility to explain the anomalies in short-baseline neutrino oscillation experiments in terms of sterile neutrinos. We work in a 3 + 1 framework and pay special attention to recent new data from reactor experiments, IceCube and MINOS+. We find that results from the DANSS and NEOS reactor experiments support the sterile neutrino explanation of the reactor anomaly, based on an analysis that relies solely on the relative comparison of measured reactor spectra. Global data from the ν e disappearance channel favour sterile neutrino oscillations at the 3σ level with Δm 412 ≈ 1.3 eV2 and |U e4| ≈ 0.1, even without any assumptions on predicted reactor fluxes. In contrast, the anomalies in the ν e appearance channel (dominated by LSND) are in strong tension with improved bounds on ν μ disappearance, mostly driven by MINOS+ and IceCube. Under the sterile neutrino oscillation hypothesis, the p-value for those data sets being consistent is less than 2.6 × 10−6. Therefore, an explanation of the LSND anomaly in terms of sterile neutrino oscillations in the 3 + 1 scenario is excluded at the 4.7σ level. This result is robust with respect to variations in the analysis and used data, in particular it depends neither on the theoretically predicted reactor neutrino fluxes, nor on constraints from any single experiment. Irrespective of the anomalies, we provide updated constraints on the allowed mixing strengths |U α4| (α = e, μ, τ ) of active neutrinos with a fourth neutrino mass state in the eV range. |
| first_indexed | 2024-04-13T22:18:28Z |
| format | Article |
| id | doaj.art-950495a8ec804655bd0b8f4eab2f0a00 |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-04-13T22:18:28Z |
| publishDate | 2018-08-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-950495a8ec804655bd0b8f4eab2f0a002022-12-22T02:27:23ZengSpringerOpenJournal of High Energy Physics1029-84792018-08-012018813510.1007/JHEP08(2018)010Updated global analysis of neutrino oscillations in the presence of eV-scale sterile neutrinosMona Dentler0Álvaro Hernández-Cabezudo1Joachim Kopp2Pedro Machado3Michele Maltoni4Ivan Martinez-Soler5Thomas Schwetz6PRISMA Cluster of Excellence, Johannes Gutenberg University MainzInstitut für Kernphysik, Karlsruher Institut für Technologie (KIT)PRISMA Cluster of Excellence, Johannes Gutenberg University MainzTheoretical Physics Department, Fermi National Accelerator LaboratoryInstituto de Física Teórica UAM/CSICInstituto de Física Teórica UAM/CSICInstitut für Kernphysik, Karlsruher Institut für Technologie (KIT)Abstract We discuss the possibility to explain the anomalies in short-baseline neutrino oscillation experiments in terms of sterile neutrinos. We work in a 3 + 1 framework and pay special attention to recent new data from reactor experiments, IceCube and MINOS+. We find that results from the DANSS and NEOS reactor experiments support the sterile neutrino explanation of the reactor anomaly, based on an analysis that relies solely on the relative comparison of measured reactor spectra. Global data from the ν e disappearance channel favour sterile neutrino oscillations at the 3σ level with Δm 412 ≈ 1.3 eV2 and |U e4| ≈ 0.1, even without any assumptions on predicted reactor fluxes. In contrast, the anomalies in the ν e appearance channel (dominated by LSND) are in strong tension with improved bounds on ν μ disappearance, mostly driven by MINOS+ and IceCube. Under the sterile neutrino oscillation hypothesis, the p-value for those data sets being consistent is less than 2.6 × 10−6. Therefore, an explanation of the LSND anomaly in terms of sterile neutrino oscillations in the 3 + 1 scenario is excluded at the 4.7σ level. This result is robust with respect to variations in the analysis and used data, in particular it depends neither on the theoretically predicted reactor neutrino fluxes, nor on constraints from any single experiment. Irrespective of the anomalies, we provide updated constraints on the allowed mixing strengths |U α4| (α = e, μ, τ ) of active neutrinos with a fourth neutrino mass state in the eV range.http://link.springer.com/article/10.1007/JHEP08(2018)010Neutrino PhysicsBeyond Standard Model |
| spellingShingle | Mona Dentler Álvaro Hernández-Cabezudo Joachim Kopp Pedro Machado Michele Maltoni Ivan Martinez-Soler Thomas Schwetz Updated global analysis of neutrino oscillations in the presence of eV-scale sterile neutrinos Journal of High Energy Physics Neutrino Physics Beyond Standard Model |
| title | Updated global analysis of neutrino oscillations in the presence of eV-scale sterile neutrinos |
| title_full | Updated global analysis of neutrino oscillations in the presence of eV-scale sterile neutrinos |
| title_fullStr | Updated global analysis of neutrino oscillations in the presence of eV-scale sterile neutrinos |
| title_full_unstemmed | Updated global analysis of neutrino oscillations in the presence of eV-scale sterile neutrinos |
| title_short | Updated global analysis of neutrino oscillations in the presence of eV-scale sterile neutrinos |
| title_sort | updated global analysis of neutrino oscillations in the presence of ev scale sterile neutrinos |
| topic | Neutrino Physics Beyond Standard Model |
| url | http://link.springer.com/article/10.1007/JHEP08(2018)010 |
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