Same-sign Charged Higgs Pair Production in bosonic decay channels at the HL-LHC and HE-LHC

TL;DR

This paper investigates the potential to measure same-sign charged Higgs pair production via vector-boson scattering at the HL-LHC and HE-LHC, focusing on the decay channel involving W and A0 bosons, to probe the scalar mass spectrum in two-Higgs-doublet models.

Contribution

It analyzes the feasibility of detecting same-sign charged Higgs pairs at future colliders, emphasizing the dominant decay mode and considering current experimental constraints.

Findings

Production cross section scales with the square of the mass difference Δm.

Decay channel H±H± → (W± A0)(W± A0) is dominant above threshold.

Parameter space constrained by theoretical, electroweak, B decay, and direct search limits.

Abstract

Same-sign charged Higgs pair production via vector-boson scattering is a useful probe of the mass spectrum among the heavier scalar, pseudoscalar, and charged Higgs bosons in two-Higgs-doublet models. It has been shown that the production cross section scales as the square of the mass difference $\Delta m = (m_{H^0} - m_{A^0})$ in the alignment limit $(\cos(\beta - \alpha)=0)$. We study the potential measurement of this same-sign charged Higgs pair production at the high-luminosity LHC (HL-LHC) and the proposed 27 TeV $pp$ collider, with emphasis in the decay channel $H^\pm H^\pm \to (W^\pm A^0 ) (W^\pm A^0)$, which is in general the dominant mode when the charged Higgs mass is above the $W^\pm A^0$ threshold. We also examine the current allowed parameter space taking into account the theoretical constraints on the model, the electroweak precision measurements, $B$ decays, and direct searches in the $H^\pm \to \tau^\pm \nu_\tau$ and $H^\pm \to W ^\pm A^0 \to (\ell^\pm\nu_{\ell} ) (\mu \mu)$.