Neutrino mass ordering obfuscated by the NSI
December 31, 2020
The current data of the two long-baseline experiments T2K and NO$\nu$A indicate a $2.4\sigma$ preference of normal neutrino mass ordering over the inverted mass ordering in case of standard $3\nu$ analysis. However such a claim does not remain unaltered in presence of neutrino non-standard interactions (NSI) involving $e-\tau$ sector. We find that the sensitivity towards the neutrino mass ordering gets completely lost. So a rubust claim of the neutrino mass ordering requires a careful consideration of the impact of NSI.
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