Measuring the leptonic CP phase in neutrino oscillations with nonunitary mixing

Autor(es)

Ge, Shao-Feng ; Pasquini, Pedro ; Tortola, M. ; Valle, J. W. F.

• Tipo de documento: Artigo Científico
• Fonte: PHYSICAL REVIEW D; v. 95, n. 3, p. 14-pg., 2017-02-16.

Resumo

Non-unitary neutrino mixing implies an extra CP violating phase that can fake the leptonic Dirac CP phase delta(CP) of the simplest three-neutrino mixing benchmark scheme. This would hinder the possibility of probing for CP violation in accelerator-type experiments. We take T2K and T2HK as examples to demonstrate the degeneracy between the "standard" (or "unitary") and "nonunitary" CP phases. We find, under the assumption of nonunitary mixing, that their CP sensitivities severely deteriorate. Fortunately, the TNT2K proposal of supplementing T2(H)K with a mu DAR source for better measurement of delta(CP) can partially break the CP degeneracy by probing both cos delta(CP) and sin delta(CP) dependences in the wide spectrum of the mu DAR flux. We also show that the further addition of a near detector to the mu DAR setup can eliminate the degeneracy completely. (AU)

• Processo FAPESP: 14/05133-1 - Física do sabor
• Beneficiário: Pedro Simoni Pasquini
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 14/19164-6 - Desafios para o século XXI em física e astrofísica de neutrinos
• Beneficiário: Orlando Luis Goulart Peres
• Modalidade de apoio: Auxílio à Pesquisa - Projetos Especiais
• Processo FAPESP: 15/16809-9 - Estudo das Massas e Parâmetros de Neutrinos e suas consequências
• Beneficiário: Pedro Simoni Pasquini
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado