Model-independent constraints on non-unitary neutrino mixing from high-precision long-baseline experiments
Abstract Our knowledge on the active 3ν mixing angles (θ 12, θ 13, and θ 23) and the CP phase δ CP is becoming accurate day-by-day enabling us to test the unitarity of the leptonic mixing matrix with utmost precision. Future high-precision long-baseline experiments are going to play an important rol...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2022-07-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP07(2022)121 |
| _version_ | 1818509775268216832 |
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| author | Sanjib Kumar Agarwalla Sudipta Das Alessio Giarnetti Davide Meloni |
| author_facet | Sanjib Kumar Agarwalla Sudipta Das Alessio Giarnetti Davide Meloni |
| author_sort | Sanjib Kumar Agarwalla |
| collection | DOAJ |
| description | Abstract Our knowledge on the active 3ν mixing angles (θ 12, θ 13, and θ 23) and the CP phase δ CP is becoming accurate day-by-day enabling us to test the unitarity of the leptonic mixing matrix with utmost precision. Future high-precision long-baseline experiments are going to play an important role in this direction. In this work, we study the impact of possible non-unitary neutrino mixing (NUNM) in the context of next-generation long-baseline experiments DUNE and T2HKK/JD+KD having one detector in Japan (T2HK/JD) and a second detector in Korea (KD). We estimate the sensitivities of these setups to place direct, model-independent, and competitive constraints on various NUNM parameters. We demonstrate the possible correlations between the NUNM parameters, θ 23, and δ CP. Our numerical results obtained using only far detector data and supported by simple approximate analytical expressions of the oscillation probabilities in matter, reveal that JD+KD has better sensitivities for |α 21 | and α 22 as compared to DUNE, due to its larger statistics in the appearance channel and less systematic uncertainties in the disappearance channel, respectively. For |α 31 |, |α 32 |, and α 33, DUNE gives better constraints as compared to JD+KD, due to its larger matter effect and wider neutrino energy spectrum. For α 11, both DUNE and JD+KD give similar bounds. We also show how much the bounds on the NUNM parameters can be improved by combining the prospective data from DUNE and JD+KD setups. We find that due to zero-distance effects, the near detectors alone can also constrain α 11, |α 21 |, and α 22 in both these setups. Finally, we observe that the ν τ appearance sample in DUNE can improve the constraints on |α 32 | and α 33. |
| first_indexed | 2024-12-10T22:50:05Z |
| format | Article |
| id | doaj.art-ca94ec6b9724430daebd3851fbb38f6a |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-12-10T22:50:05Z |
| publishDate | 2022-07-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-ca94ec6b9724430daebd3851fbb38f6a2022-12-22T01:30:28ZengSpringerOpenJournal of High Energy Physics1029-84792022-07-012022713910.1007/JHEP07(2022)121Model-independent constraints on non-unitary neutrino mixing from high-precision long-baseline experimentsSanjib Kumar Agarwalla0Sudipta Das1Alessio Giarnetti2Davide Meloni3Institute of Physics, Sainik School PostInstitute of Physics, Sainik School PostDipartimento di Matematica e Fisica, Università di Roma TreDipartimento di Matematica e Fisica, Università di Roma TreAbstract Our knowledge on the active 3ν mixing angles (θ 12, θ 13, and θ 23) and the CP phase δ CP is becoming accurate day-by-day enabling us to test the unitarity of the leptonic mixing matrix with utmost precision. Future high-precision long-baseline experiments are going to play an important role in this direction. In this work, we study the impact of possible non-unitary neutrino mixing (NUNM) in the context of next-generation long-baseline experiments DUNE and T2HKK/JD+KD having one detector in Japan (T2HK/JD) and a second detector in Korea (KD). We estimate the sensitivities of these setups to place direct, model-independent, and competitive constraints on various NUNM parameters. We demonstrate the possible correlations between the NUNM parameters, θ 23, and δ CP. Our numerical results obtained using only far detector data and supported by simple approximate analytical expressions of the oscillation probabilities in matter, reveal that JD+KD has better sensitivities for |α 21 | and α 22 as compared to DUNE, due to its larger statistics in the appearance channel and less systematic uncertainties in the disappearance channel, respectively. For |α 31 |, |α 32 |, and α 33, DUNE gives better constraints as compared to JD+KD, due to its larger matter effect and wider neutrino energy spectrum. For α 11, both DUNE and JD+KD give similar bounds. We also show how much the bounds on the NUNM parameters can be improved by combining the prospective data from DUNE and JD+KD setups. We find that due to zero-distance effects, the near detectors alone can also constrain α 11, |α 21 |, and α 22 in both these setups. Finally, we observe that the ν τ appearance sample in DUNE can improve the constraints on |α 32 | and α 33.https://doi.org/10.1007/JHEP07(2022)121Beyond Standard ModelNeutrino Physics |
| spellingShingle | Sanjib Kumar Agarwalla Sudipta Das Alessio Giarnetti Davide Meloni Model-independent constraints on non-unitary neutrino mixing from high-precision long-baseline experiments Journal of High Energy Physics Beyond Standard Model Neutrino Physics |
| title | Model-independent constraints on non-unitary neutrino mixing from high-precision long-baseline experiments |
| title_full | Model-independent constraints on non-unitary neutrino mixing from high-precision long-baseline experiments |
| title_fullStr | Model-independent constraints on non-unitary neutrino mixing from high-precision long-baseline experiments |
| title_full_unstemmed | Model-independent constraints on non-unitary neutrino mixing from high-precision long-baseline experiments |
| title_short | Model-independent constraints on non-unitary neutrino mixing from high-precision long-baseline experiments |
| title_sort | model independent constraints on non unitary neutrino mixing from high precision long baseline experiments |
| topic | Beyond Standard Model Neutrino Physics |
| url | https://doi.org/10.1007/JHEP07(2022)121 |
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