It is by now established that neutrino oscillations occur due to nonzero masses and parameters in the leptonic mixing matrix. The extraction of oscillation parameters may be complicated due to subleading effects such as nonstandard neutrino interactions and one needs to have a fresh look how a particular parameter value is inferred from experimental data. In the present work, we focus on an important parameter entering the oscillation framework–the leptonic $CP$-violating phase $\delta$, about which we know very little. We demonstrate that the sensitivity to $CP$ violation gets significantly impacted due to nonstandard neutrino interaction effects for the upcoming long baseline experiment, Deep Underground Neutrino Experiment. We also draw a comparison with the sensitivities of other ongoing neutrino beam experiments such as $\mathrm{NO}\nu \mathrm{A}$ and T2K as well as a future generation experiment, T2HK.

• Received 11 March 2016

DOI:https://doi.org/10.1103/PhysRevD.94.013014