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The existence of tiny neutrino masses at a scale more than a million timessmaller than the lightest charged fermion mass, namely the electron, and theirmixings can not be explained within the framework of the exceptionallysuccessful Standard Model. There are four ideas that has been proposed toexplain the tiny neutrino masses. These include the see-saw mechanism with aright handed neutrino at the GUT scale, and this is the most elegant mechanism.The other mechanisms are radiatively generated neutrino masses, the neutrinomass arising from a 2nd Higgs doublet having a tiny VEV and coupling only tothe neutrinos, and finally the mirror model or simply the EW-scale $\nu_R$model. The mirror model has new quarks and leptons of opposite chirality at theelectroweak scale (for the same Standard Model gauge symmetry $SU(2)_W \timesU(1)_Y$) compared to what we have for the Standard Model. With suitablemodification of the Higgs sector, the EW-scale $\nu_R$ model satisfies theelectroweak precision test and also the constraints coming from the observed125-GeV Higgs scalar. Since in this model, the mirror fermions are required tobe in the EW scale, these can be produced at the LHC giving final states with avery low background from the SM. One such final state is the same signdileptons with large missing $p_T$ for the events. In this work, we explore theconstraint provided by the $8$ TeV data, and prospect of observing this signalin the $13$ TeV runs at the LHC. Additional signals will be the presence ofdisplaced vertices depending on the smallness of the Yukawa couplings of themirror leptons with the ordinary leptons and the singlet Higgs present in themodel. Of particular importance to the EW-scale $\nu_R$ model is the productionof $\nu_R$ which will be a direct test of the seesaw mechanism at colliderenergies.

The search for electroweak-scale right-handed neutrinos and mirror charged leptons through like-sign dilepton signals