Sensitivities to charged-current nonstandard neutrino interactions at DUNE

We investigate the effects of charged-current nonstandard neutrino interactions (NSIs) at the source and at the detector in the simulated data for the planned Deep Underground Neutrino Experiment (DUNE), while neglecting the neutral-current NSIs at the propagation. We study the effects of NSIs on the simultaneous measurements of $\theta_{23}$ and $ \delta _{CP} $ in the DUNE. The analysis reveals that 3$\sigma $ C.L. measurement of the correct octant of $\theta _{23}$ in the standard mixing scenario is spoiled if NSIs are taken into account. Likewise, the NSIs can deteriorate the uncertainty of the $\delta _{CP}$ measurement by a factor of two relative to that in the standard oscillation scenario. We further show that the source and the detector NSIs can induce a significant amount of fake CP-violation and the no fake CP-violation case can be excluded by more than 99\% C.L. We also find the potential of DUNE to constrain the relevant charged-current NSI parameters from the single parameter fits for both neutrino and antineutrino appearance and disappearance channels at both the near and far detectors. The results show that there could be improvement in the current bounds by a factor of two at the far detector of DUNE, while one order of magnitude improvement at the near detector.