# Revisiting the $t\bar{t}hh$ channel at the FCC-hh

## TL;DR

This paper investigates the potential of the $t\bar{t}hh$ channel at a future 100 TeV collider to measure the Higgs self-coupling and probe new physics, emphasizing its importance in understanding the scalar sector.

## Contribution

It provides a detailed analysis of the $t\bar{t}hh$ channel's sensitivity to Higgs self-interactions and new physics at a future collider, highlighting its necessity for comprehensive scalar sector studies.

## Key findings

- Enhanced sensitivity to Higgs self-coupling interactions.
- The $t\bar{t}hh$ channel helps constrain new physics scenarios.
- Measurement is crucial for understanding scalar sector parameters.

## Abstract

The exploration of the scalar sector of the Standard Model is at the core of current and future science programs at collider experiments, with increasing focus on the self-interaction of the Higgs boson. This important parameter of the Higgs sector can be measured in various channels, among the production of a Higgs boson associated with a top-quark pair, $\bar{t}thh$. In this paper we study this channel and its potential to measure or constrain the self-coupling and possible new physics contributions at a future 100 TeV proton-proton collider. Analysing this highly complex final state adds to the sensitivity for enhanced self-coupling interactions, and we argue that a measurement of this process is a necessity to constrain blind directions in the multi-dimensional parameter space of well-motivated new physics scenarios.