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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

A framework for testing leptonic unitarity by neutrino oscillation experiments

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Autor(es):
Fong, Chee Sheng ; Minakata, Hisakazu ; Nunokawa, Hiroshi
Número total de Autores: 3
Tipo de documento: Artigo Científico
Fonte: Journal of High Energy Physics; n. 2 FEB 22 2017.
Citações Web of Science: 8
Resumo

If leptonic unitarity is violated by new physics at an energy scale much lower than the electroweak scale, which we call low-scale unitarity violation, it has different characteristic features from those expected in unitarity violation at high-energy scales. They include maintaining flavor universality and absence of zero-distance flavor transition. We present a framework for testing such unitarity violation at low energies by neutrino oscillation experiments. Starting from the unitary 3 active plus N (arbitrary positive integer) sterile neutrino model we show that by restricting the active-sterile and sterile sterile neutrino mass squared differences to greater than or similar to 0.1 eV(2) the oscillation probability in the (3 + N) model becomes insensitive to details of the sterile sector, providing a nearly model independent framework for testing low-scale unitarity violation. Yet, the presence of the sterile sector leaves trace as a constant probability leaking term, which distinguishes low scale unitarity violation from the high-scale one. The non-unitary mixing matrix in the active neutrino subspace is common for the both cases. We analyze how severely the unitarity violation can be constrained in ye-row by taking a JUNO-like setting to simulate medium baseline reactor experiments. Possible modification of the features of the (3 + N) model due to matter effect is discussed to first order in the matter potential. (AU)

Processo FAPESP: 12/10995-7 - Fenomenologia de física de partículas
Beneficiário:Gustavo Alberto Burdman
Linha de fomento: Auxílio à Pesquisa - Temático
Processo FAPESP: 13/01792-8 - Matéria escura e física das partículas
Beneficiário:Nicolas Bernal Hernandez
Linha de fomento: Bolsas no Brasil - Pós-Doutorado
Processo FAPESP: 15/05208-4 - Física de neutrinos
Beneficiário:Renata Zukanovich Funchal
Linha de fomento: Auxílio à Pesquisa - Pesquisador Visitante - Internacional