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I report some progress that occurred since NO-VE08 in the field ofnon-standard interactions (NSI) of neutrinos. After briefly reviewingtheoretical developments, I give a summary of the two works in which I wasinvolved. Firstly, we have formulated a perturbative framework to illuminatethe global features of neutrino oscillations with NSI, aiming at exploringmethod for determination of the standard mixing and the NSI parameters. We haverecognized that the parameter degeneracy prevails with an extended form whichinvolves the NSI elements. Furthermore, a completely new type of degeneracy isshown to exist. The nature of the former degeneracy is analyzed in detail inthe second work. The work is primarily devoted to analyze the problem ofdiscriminating the two CP violation, one due to the lepton Kobayashi-Maskawaphase and the other by phases of the NSI elements. We have shown that the near(3000 km)-far (7000 km) two detector setting in neutrino factory does have thediscrimination capability and is sensitivities to CP violation due to NSI to|epsilon_{e\mu}| to \simeq several x 10^{-4} in most of the region of \deltaand \phi.

Neutrino's Non-Standard Interactions; Another Eel under a Willow?