# LHC Search of New Higgs Boson via Resonant Di-Higgs Production with Decays into 4W

## TL;DR

This paper investigates the potential to discover a new heavy Higgs boson at the LHC through resonant di-Higgs production decaying into four W bosons, analyzing different decay modes and assessing the discovery reach within two-Higgs-doublet models.

## Contribution

It provides a comprehensive simulation-based analysis of heavy Higgs search strategies in the 4W channel at the LHC, including parameter space constraints in 2HDM.

## Key findings

- Potential to discover heavy Higgs at LHC Run-2 and HL-LHC
- Identification of viable 2HDM parameter regions for heavy Higgs searches
- Comparison of current bounds with future search sensitivities

## Abstract

Searching for new Higgs particle beyond the observed light Higgs boson h(125GeV) will unambiguously point to new physics beyond the standard model. We study the resonant production of a CP-even heavy Higgs state $H^0$ in the di-Higgs channel via, $gg\to H^0\to h^0h^0\to WW^*WW^*$, at the LHC Run-2 and the high luminosity LHC (HL-LHC). We analyze two types of the $4W$ decay modes, one with the same-sign di-leptons ($4W\to\ell^\pm\nu\ell^\pm\nu 4q$) and the other with tri-leptons ($4W\to\ell^\pm\nu\ell^\mp\nu\ell^\pm\nu 2q$). We perform a full simulation for the signals and backgrounds, and estimate the discovery potential of the heavy Higgs state at the LHC Run-2 and the HL-LHC, in the context of generical two-Higgs-doublet models (2HDM). We determine the viable parameter space of the 2HDM as allowed by the theoretical constraints and the current experimental limits. We systematically analyze the allowed parameter space of the 2HDM which can be effectively probed by the heavy Higgs searches of the LHC, and further compare this with the viable parameter region under the current theoretical and experimental bounds.