Simplified model approach to same-sign dilepton resonances

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Abstract

We discuss same-sign dilepton resonances in the simplified model approach. The relevant $\mathrm{SU}(3{)}_{Q}^{J}$ quantum numbers are ${\mathbf{1}}_{2}^{0,1,2}$. 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 $\mathrm{SU}(2{)}_{L}$ 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 ${H}^{\ifmmode\pm\else\textpm\fi{}\ifmmode\pm\else\textpm\fi{}}$ decay in the $ee$ and $\ensuremath{\mu}\ensuremath{\mu}$ channels. We find that at 7 TeV, the LHC with $10\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ luminosity can probe mass of the doubly charged Higgs up to 380 GeV assuming 100% decay to leptons. At 14 TeV, the LHC with $100\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ luminosity can reach a mass of up to 800 GeV.

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