VBS ${\rm W}^\pm {\rm W}^\pm {\rm H}$ production at the HL-LHC and a 100 TeV pp-collider

TL;DR

This paper investigates the production of W±W±H via vector boson scattering at future colliders, assessing its potential to constrain Higgs couplings and explore new physics beyond the Standard Model.

Contribution

It provides the first Monte Carlo analysis of W±W±H production at the HL-LHC and a 100 TeV collider, focusing on sensitivity to Higgs couplings and the effects of pileup.

Findings

WWHH coupling can be constrained within 20-100% at future colliders.

Sensitivity to the HHH coupling remains low.

Pileup impacts the measurement sensitivity significantly.

Abstract

${\rm W}^\pm {\rm W}^\pm {\rm H}$ production at hadron colliders through vector boson scattering is a so far unconsidered process, which leads to a clean signature of two same-sign charged leptons and two widely separated jets. This process is sensitive to the ${\rm HHH}$ and ${\rm WWHH}$ couplings and any deviation of these couplings from their SM predictions serves as direct evidence of new physics beyond the SM. In this paper we perform a Monte Carlo study of this process for the $\sqrt{s}=14$ TeV LHC and a $100$ TeV pp-collider, and provide projections of the constraints on the triple-Higgs and ${\rm WWHH}$ quartic couplings for these environments. In particular, we consider the impact of pileup on the expected sensitivity in this channel. Our analysis demonstrates that although the sensitivity to the ${\rm HHH}$ coupling is rather low, the ${\rm WWHH}$ coupling can be constrained in this channel within $\sim 100\%$ and $\sim 20\%$ at 95\% confidence level around the SM prediction at the HL-LHC and a 100 TeV pp-collider, respectively.