Simplified model approach to same-sign dilepton resonances

We discuss same-sign dilepton resonances in the simplified model approach. The relevant SU(3)QJ quantum numbers are 1₂0,1,2. For simplicity, we only consider a spin 0 scalar, which is typically referred to as a doubly charged Higgs in the literature. We consider the three simplest cases where the doubly charged Higgs resides in a singlet, doublet or triplet SU(2)L representation. We discuss production and decay of such a doubly charged Higgs, summarize the current direct search limits, and obtain mass limits in the cases of singlet and doublet for the first time. We also present a complete set of updated indirect search limits. We study the discovery potential at the Large Hadron Collider (LHC) with center of mass energies 7 and 14 TeV for the dominant Drell-Yan pair production with H^±± decay in the $ee$ and μμ channels. We find that at 7 TeV, the LHC with 10 fb^-1 luminosity can probe mass of the doubly charged Higgs up to 380 GeV assuming 100% decay to leptons. At 14 TeV, the LHC with 100 fb^-1 luminosity can reach a mass of up to 800 GeV.