Flavor changing neutrino interactions and CP violation in neutrino oscillations

We investigate the interference effects of non-standard neutrino matter interactions (NSNI) with the mass-induced neutrino oscillations. The NSNI is composed of flavor-changing neutrino interactions (FCNI) and flavor-diagonal neutrino interactions (FDNI). Both of the interactions are introduced in the νμ − ντ sector and the νe−νμ sector in order to study their effects in νμ → ντ and νμ → νe oscillations, respectively. The FCNI effect proves to possibly dominate the CP violating effect, i.e. the difference between the neutrino and the antineutrino oscillation probabilities. The FCNI effect significantly survives as a fake CP violating effect in the neutrino energy region where the pure CP violating effect, ordinary matter effect and FDNI effect die out, for example, above 4 GeV at the baseline of L = 730 km in the νμ → ντ oscillation for the maximum parameter values of FCNI and FDNI allowed by the atmospheric neutrino oscillation data. The FCNI and FDNI effects on the CP violating effect in the νμ → νe oscillation are negligibly small due to the stringent constraints on FCNI from the bounds on lepton flavor violating processes and on FDNI from the limits on lepton universality violation.