Allowing electron-tau non-standard neutrino interactions in the T2K and NOvA data removes the preference for normal mass ordering and even creates a mild preference for inverted ordering.
False Signals of CP-Invariance Violation at DUNE
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abstract
One of the main goals of the Deep Underground Neutrino Experiment (DUNE) is to look for new sources of CP-invariance violation. Another is to significantly test the three-massive-neutrinos paradigm. Here, we show that there are CP-invariant new physics scenarios which, as far as DUNE data are concerned, cannot be distinguished from the three-massive-neutrinos paradigm with very large CP-invariance violating effects. We discuss examples with non-standard neutrino interactions and with a fourth neutrino mass eigenstate. We briefly discuss how ambiguities can be resolved by combining DUNE data with data from other long-baseline experiments, including Hyper-Kamiokande.
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Neutrino mass ordering obscured by non-standard interactions
Allowing electron-tau non-standard neutrino interactions in the T2K and NOvA data removes the preference for normal mass ordering and even creates a mild preference for inverted ordering.