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.
On the Determination of Leptonic CP Violation and Neutrino Mass Ordering in Presence of Non-Standard Interactions: Present Status
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abstract
We perform a global analysis of neutrino data in the framework of three massive neutrinos with non-standard neutrino interactions which affect their evolution in the matter background. We focus on the effect of NSI in the present observables sensitive to leptonic CP violation and to the mass ordering. We consider complex neutral current neutrino interactions with quarks whose lepton-flavor structure is independent of the quark type. We quantify the status of the "hints" for CP violation, the mass-ordering and non-maximality of $\theta_{23}$ in these scenarios. We also present a parametrization-invariant formalism for leptonic CP violation in presence of a generalized matter potential induced by NSI.
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2019 1verdicts
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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.