Nonstandard Interaction of Atmospheric Neutrino in Future Experiments

We show the prospects of probing neutral-current non-standard interaction (NSI) in the propagation of atmospheric neutrinos in future large-volume neutrino experiments including DUNE, HK, KNO, and ORCA. For DUNE, we utilize its ability of identifying the tau neutrino event and combine the ν τ appearance with the ν µ disappearance. Based on our simulated results, the ten years of data taking of the atmospheric neutrinos can enormously improve the bounds on the NSI parameters ε µτ , | ε µµ − ε ττ | , ε eµ , ε eτ and | ε µµ − ε ee | by a couple of orders of magnitudes. In addition, we show the expected correlations between the CP-violation phase δ CP and the NSI parameters ε eµ , ε eτ , and | ε ee − ε µµ | and confirm the potentials of DUNE, HK, KNO (combined with HK) in excluding the “No CP violation” hypothesis at 1 σ , 2 σ , and 3 σ , respectively.