Abstract
We study the effects of non-standard interactions (NSI) and the genuine CP phase δ D in neutrino oscillations at low, E v ≲ 1 GeV, and very low, E v ≲ 0.1 GeV, energies. For experimental setup with baseline and neutrino energy tuned to the first 1-3 oscillation maximum, we develop a simple analytic formalism to show the effects of NSI. The vacuum mimicking and its violation as well as the use of the separation basis play a central role in our formalism. The NSI corrections that affect the CP phase measurement mainly come from the violation of vacuum mimicking as well as from the corrections to the 1-3 mixing angle and mass-squared difference. We find that the total NSI correction to the ν μ − ν e probability P μe can reach 20% − 30% (1σ) at T2(H)K. Correspondingly, the correction to the CP phase can be as large as 50° and hence significantly deteriorates the CP sensitivity at T2(H)K. The proposed TNT2K experiment, a combination of T2(H)K and the short baseline experiment μKam that uses the Super-K/Hyper-K detector at Kamioka to measure the oscillation of the antineutrinos from muon decay at rest (μDAR), can substantially reduce the degeneracy between NSI and the genuine CP phase δ D to provide high CP sensitivity. The NSI correction to P μe is only 2% (1σ) for μDAR neutrinos.
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Ge, SF., Smirnov, A.Y. Non-standard interactions and the CP phase measurements in neutrino oscillations at low energies. J. High Energ. Phys. 2016, 138 (2016). https://doi.org/10.1007/JHEP10(2016)138
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DOI: https://doi.org/10.1007/JHEP10(2016)138