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.
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