Flavor changing neutrino interactions and CP violation in neutrino oscillations

Abstract

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 ν_μ-ν_τsector and the ν_e -ν_μsector in order to study their effects in ν_μ\toν_τand ν_μ\toν_e oscillations, respectively. The FCNI effect proves to possibly dominate the CP violating effect and significantly survive as a fake CP violating effct in the neutrino energy region where the pure CP violating effect, ordinary matter effect and FDNI effect fall, for example, above 4 GeV at the baseline of L=730 km in the ν_μ\toν_τoscillation for the maximum parameter values of FCNI and FDNI allowed by the atmospheric neutrino oscillation data. The FCNI and FDNI effects on CP violation in the ${\nu }_{\mu }\to {\nu }_e$ 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.

18 pages in LaTeX2e, 12 ps figures. The discussion of detectability of the CP violation is deleted

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