Higgs Self-Coupling Measurements at a 100 TeV Hadron Collider

TL;DR

This paper evaluates the potential of a 100 TeV hadron collider to precisely measure the Higgs self-coupling through dihiggs production, highlighting the achievable accuracy with different data volumes.

Contribution

It provides an analysis of the sensitivity of a future 100 TeV collider to the Higgs self-coupling, including optimized detection strategies and expected measurement precision.

Findings

40% accuracy with 3/ab of data

12% accuracy with 30/ab of data

Enhanced sensitivity by analyzing dihiggs recoils against a hard jet

Abstract

An important physics goal of a possible next-generation high-energy hadron collider will be precision characterisation of the Higgs sector and electroweak symmetry breaking. A crucial part of understanding the nature of electroweak symmetry breaking is measuring the Higgs self-interactions. We study dihiggs production in proton-proton collisions at 100 TeV centre of mass energy in order to estimate the sensitivity such a machine would have to variations in the trilinear Higgs coupling around the Standard Model expectation. We focus on the two b-jets plus diphotons final state, including possible enhancements in sensitivity by exploiting dihiggs recoils against a hard jet. We find that it should be possible to measure the trilinear self-coupling with 40% accuracy given 3/ab and 12% with 30/ab of data.