  Trilepton event represents one of the probes of the new physics at high
energy colliders. In this talk, we consider the search for processes with final
states $\ell_{\alpha}^{\pm }\ell_{\beta}^{\pm}\ell_{\gamma}^{\mp}$ +
$\slashed{E}_{T}$ where
  ${\alpha}$, ${\beta}$, ${\gamma}$= $e,\mu,\tau$, via the production of
singlet charged scalar $S^{\pm}$ which arise in a class of radiative neutrino
mass models. We discuss the opposite sign same flavor leptons signal, as well
as the background free channel in view to get a significant excess at
$\sqrt{s}$= 8 TeV and $\sqrt{s}$ = 14 TeV at the hadron collider LHC.
