  In a class of neutrino mass models with a lepton flavor violation (LFV)
Yukawa interaction term that involves a heavy right handed neutrino, a charged
scalar and a charged lepton, we investigate at the ILC@500 GeV the possibility
of observing news physics. These models can address neutrino mass and dark
matter without being in conflict with different LFV constraints. By imposing DM
relic density and LFV constraints, we recast the analysis done by L3
collaboration at LEP-II of monophoton searches on our space parameter and look
for new physics in such channels like monophoton and $S S(\gamma)$, where we
give different cuts and show the predicted distributions. We show also that
using polarized beams could improve the statistical significance.
