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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.)

Non-unitary evolution of neutrinos in matter and the leptonic unitarity test

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Autor(es):
Fong, Chee Sheng [1, 2] ; Minakata, Hisakazu [3, 4] ; Nunokawa, Hiroshi [5]
Número total de Autores: 3
Afiliação do(s) autor(es):
[1] Univ Fed ABC, Ctr Ciencias Nat & Humanas, BR-09210580 Santo Andre, SP - Brazil
[2] Univ Sao Paulo, Inst Fis, CP 66-318, BR-05315970 Sao Paulo - Brazil
[3] UAM, CSIC, Inst Fis Teor, Calle Nicolas Cabrera 13-15, E-28049 Madrid - Spain
[4] Univ Tokyo, Inst Cosm Ray Res, Res Ctr Cosm Neutrinos, Kashiwa, Chiba 2778582 - Japan
[5] Pontificia Univ Catolica Rio de Janeiro, Dept Fis, CP 38097, BR-22451900 Rio De Janeiro - Brazil
Número total de Afiliações: 5
Tipo de documento: Artigo Científico
Fonte: Journal of High Energy Physics; n. 2 FEB 4 2019.
Citações Web of Science: 0
Resumo

We present a comprehensive study of the three-active plus N sterile neutrino model as a framework for constraining leptonic unitarity violation induced at energy scales much lower than the electroweak scale. We formulate a perturbation theory with expansion in small unitarity violating matrix element W while keeping (non-W suppressed) matter effect to all orders. We show that under the same condition of sterile state masses 0.1 eV(2) ae(2) m (J) (2) ae(2) (1-10) GeV2 as in vacuum, assuming typical accelerator based long-baseline neutrino oscillation experiment, one can derive a very simple form of the oscillation probability which consists only of zeroth-order terms with the unique exception of probability leaking term (alpha beta) of (W (4)). We argue, based on our explicit computation to fourth-order in W, that all the other terms are negligibly small after taking into account the suppression due to the mass condition for sterile states, rendering the oscillation probability sterile-sector model independent. Then, we identify a limited energy region in which this suppression is evaded and the effects of order W (2) corrections may be observable. Its detection would provide another way, in addition to detecting (alpha beta) , to distinguish between low-scale and high-scale unitarity violation. We also solve analytically the zeroth-order system in matter with uniform density to provide a basis for numerical evaluation of non-unitary neutrino evolution. (AU)

Processo FAPESP: 14/19164-6 - Desafios para o século XXI em física e astrofísica de neutrinos
Beneficiário:Orlando Luis Goulart Peres
Linha de fomento: Auxílio à Pesquisa - Temático
Processo FAPESP: 12/10995-7 - Fenomenologia de física de partículas
Beneficiário:Gustavo Alberto Burdman
Linha de fomento: Auxílio à Pesquisa - Temático
Processo FAPESP: 16/01343-7 - ICTP Instituto Sul-Americano para Física Fundamental: um centro regional para física teórica
Beneficiário:Nathan Jacob Berkovits
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