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Measuring the leptonic CP phase in neutrino oscillations with nonunitary mixing

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Measuring the leptonic CP phase in neutrino oscillations with nonunitary mixing

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Ge, Shao-Feng; Pasquini, Pedro; Tórtola Baixauli, María Amparo; Furtado Valle, José Wagner

Aquest document és un/a article, creat/da en: 2017

Non-unitary neutrino mixing implies an extra CP violating phase that can fake the leptonic Dirac CP phase δCP 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 "non-unitary" CP phases. We find, under the assumption of non-unitary mixing, that their CP sensitivities severely deteriorate. Fortunately, the TNT2K proposal of supplementing T2(H)K with a µDAR source for better measurement of δCP can partially break the CP degeneracy by probing both cos δCP and sin δCP dependences in the wide spectrum of the µDAR flux. We also show that the further addition of a near detector to the µDAR setup can eliminate the degeneracy completely.

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