Constraining nonstandard neutrino interactions at electron colliders

The presence of nonstandard neutrino interactions (NSI) has a large effect on the precision measurements at next generation oscillation experiments. Other type experiments are needed to constrain NSI parameter space. We study constraints with electrons from current and future $e^+e^-$ collider including Belle II, STCF CEPC. find that II will provide competitive complementary bounds electron-type parameters compared global analysis, strong improvements for tau-type NSI. In addition, CEPC alone impose stringent space electrons. degeneracy between left-handed (vector) right-handed (axial-vector) can be lifted by combining data three different running modes, allowed ranges $|\epsilon_{ee}^{eL}|$ ($|\epsilon_{ee}^{eV}|$) $|\epsilon_{ee}^{eR}|$ ($|\epsilon_{ee}^{eA}|$) constrained smaller than 0.002 even if both them present.