Non-Standard Interactions in propagation at the Deep Underground Neutrino Experiment

Abstract

We study the sensitivity of current and future long-baseline neutrino oscillation experiments to the effects of dimension six operators affecting neutrino propagation through Earth, commonly referred to as Non-Standard Interactions (NSI). All relevant parameters entering the oscillation probabilities (standard and non-standard) are considered at once, in order to take into account possible cancellations and degeneracies between them. We find that the Deep Underground Neutrino Experiment will significantly improve over current constraints for most NSI parameters. Most notably, it will be able to rule out the so-called LMA-dark solution, still compatible with current oscillation data, and will be sensitive to off-diagonal NSI parameters at the level of $\epsilon \sim \mathcal{O}(0.05-0.5)$. We also identify two degeneracies among standard and non-standard parameters, which could be partially resolved by combining T2HK and DUNE data.

26 pages, 8 figures. v2: Major changes due to the inclusion of prior constraints on NSI coming from global fits of oscillation data, matches the version accepted for publication in JHEP. v3: references added and typos corrected

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