Standard Model Higgs boson pair production in the $(b\bar{b})(b\bar{b})$ final state

TL;DR

This paper explores how boosted Higgs boson pair production in the $(b\bar{b})(b\bar{b})$ final state at the High Luminosity LHC can constrain the Higgs self-coupling using jet substructure techniques, proposing new strategies for trigger and b-tagging.

Contribution

It introduces a novel approach to measure the Higgs self-coupling in boosted regimes using jet substructure, and discusses new trigger and b-tagging strategies for future LHC runs.

Findings

Potential to set a limit of λ ≤ 1.2 at 95% CL with 3000 fb⁻¹

Use of jet substructure techniques to distinguish signal from background

Proposal of a data-driven side-band analysis to improve measurements

Abstract

Measuring the Higgs boson couplings as precisely as possible is one of the major goals of the High Luminosity LHC. We show that the $(b\bar{b})(b\bar{b})$ final state in Higgs boson pair production can be exploited in the boosted regime to give constraints on the trilinear Higgs boson self-coupling. In these exclusive phase space regions, novel jet substructure techniques can be used to separate the signal from the large QCD and electroweak backgrounds. New developments on trigger and b-tagging strategies for the upcoming LHC runs are necessary in order to reconstruct the Higgs bosons in boosted final states, where the trilinear self-coupling sensitivity is reduced. We find that using our approach one can set a limit for $\lambda \leq 1.2$ at $95 \%$ CL after $3000~\mathrm{fb}^{-1}$. As the signal-to-background ratio is small we propose a data-driven side-band analysis to improve on the coupling measurement.