A Simplified Model Approach to Same-sign Dilepton Resonances

TL;DR

This paper analyzes the production and detection prospects of doubly charged Higgs bosons in simplified models, providing updated mass limits and exploring discovery potential at the LHC with different energies and luminosities.

Contribution

It introduces a simplified model framework for doubly charged Higgs bosons, calculates new mass limits, and evaluates LHC discovery prospects at 7 and 14 TeV energies.

Findings

Mass limits of 380 GeV at 7 TeV and 800 GeV at 14 TeV for doubly charged Higgs.

Updated direct and indirect search limits for doubly charged Higgs.

LHC can probe significant parameter space for doubly charged Higgs detection.

Abstract

We discuss same-sign dilepton resonances in the simplified model approach. The relevant $SU(3}_Q^J$ quantum numbers are $1_2^{0,1,2}$. 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 $SU(2)_L$ 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 $H^{\pm\pm}$ decay in the $ee$ and $\mu\mu$ 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.