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

Understand

I report some progress that occurred since NO-VE08 in the field of non-standard interactions (NSI) of neutrinos.

• After briefly reviewing theoretical developments, I give a summary of the two works in which I was involved.
• Firstly, we have formulated a perturbative framework to illuminate the global features of neutrino oscillations with NSI, aiming at exploring method for determination of the standard mixing and the NSI parameters.
• We have recognized that the parameter degeneracy prevails with an extended form which involves the NSI elements.