Searching for non-unitary neutrino oscillations in the present T2K and NO ν A data

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dc.contributor.authorMiranda, Luis Salvador
dc.contributor.authorPasquini, Pedro [UNESP]
dc.contributor.authorRahaman, Ushak
dc.contributor.authorRazzaque, Soebur
dc.contributor.institutionUniversity of Johannesburg
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionShanghai Jiao Tong University
dc.date.accessioned2021-06-25T11:01:17Z
dc.date.available2021-06-25T11:01:17Z
dc.date.issued2021-05-01
dc.description.abstractThe mixing of three active neutrino flavors is parameterized by the unitary PMNS matrix. If there are more than three neutrino flavors and if the extra generations are heavy iso-singlets, the effective 3 × 3 mixing matrix for the three active neutrinos will be non-unitary. We have analyzed the latest T2K and NOνA data with the hypothesis of non-unitary mixing of the active neutrinos. We found that the 2019 NOνA data slightly (at ∼1σ CL) prefer the non-unitary mixing over unitary mixing. In fact, allowing the non-unitary mixing brings the NOνA best-fit point in the sin 2θ23- δCP plane closer to the T2K best-fit point. The 2019 T2K data, on the other hand, cannot rule out any of the two mixing schemes. A combined analysis of the NOνA and T2K 2019 data prefers the non-unitary mixing at 1σ CL. We derive constraints on the non-unitary mixing parameters using the best-fit to the combined NOνA and T2K data. These constraints are weaker than previously found. The latest 2020 data from both the experiments prefer non-unitarity over unitary mixing at 1σ CL. The combined analysis prefers non-unitarity at 2σ CL. The stronger tension, which exists between the latest 2020 data of the two experiments, also gets reduced with non-unitary analysis.en
dc.description.affiliationCentre for Astro-Particle Physics (CAPP) and Department of Physics University of Johannesburg, PO Box 524
dc.description.affiliationInstituto de Física Teórica–Universidade Estadual Paulista (UNESP), R. Dr. Bento Teobaldo Ferraz 271, Barra Funda
dc.description.affiliationTsung-Dao Lee Institute and School of Physics and Astronomy Shanghai Jiao Tong University
dc.description.affiliationUnespInstituto de Física Teórica–Universidade Estadual Paulista (UNESP), R. Dr. Bento Teobaldo Ferraz 271, Barra Funda
dc.identifierhttp://dx.doi.org/10.1140/epjc/s10052-021-09227-0
dc.identifier.citationEuropean Physical Journal C, v. 81, n. 5, 2021.
dc.identifier.doi10.1140/epjc/s10052-021-09227-0
dc.identifier.issn1434-6052
dc.identifier.issn1434-6044
dc.identifier.scopus2-s2.0-85106953074
dc.identifier.urihttp://hdl.handle.net/11449/207804
dc.language.isoeng
dc.relation.ispartofEuropean Physical Journal C
dc.sourceScopus
dc.titleSearching for non-unitary neutrino oscillations in the present T2K and NO ν A dataen
dc.typeArtigo
unesp.author.orcid0000-0003-0419-2970[3]

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