Triple Higgs Boson Production with Two Heavy Scalars at the LHC via a Simplified Approach

TL;DR

This paper presents a simplified method to analyze triple Higgs boson production involving two heavy scalars at the LHC, enabling constraints on extended scalar models during high-luminosity runs.

Contribution

It introduces a factorized approach in the narrow-width approximation for double-resonant triple Higgs production, applicable to models with two new neutral scalars.

Findings

Constraints can be derived on extended scalar models.

Double-resonant processes are sufficient for analysis.

Non-resonant contributions are negligible in the studied scenario.

Abstract

We investigate triple Higgs boson production at the CERN LHC, in models containing two new neutral scalar particles heavier than the Higgs boson. We apply a simplified factorized approach in the narrow-width approximation to double-resonant triple Higgs boson production, and demonstrate that relevant constraints can be derived on models with extended scalar sectors, during the high-luminosity phase of the LHC. We also show that analyzing the double-resonant process will be sufficient at the LHC, within an explicit model with two real singlet scalar fields, and that non-resonant components are not expected to play a crucial role in the specific scenario. The method can be applied to any model where triple Higgs boson production can be enhanced via the double-resonant process in the presence of two new neutral scalar resonances.