A sensitivity target for an impactful Higgs boson self coupling measurement

TL;DR

This paper proposes a sensitivity threshold for measuring the Higgs boson self-coupling, emphasizing its significance in theories where the coupling deviates within 40% of the Standard Model prediction, guiding future experimental efforts.

Contribution

It introduces a meaningful sensitivity target for Higgs self-coupling measurements based on theoretical bounds from custodial-violating models.

Findings

Sensitivity within 40% of SM value is impactful for new physics detection

Effective field theory coefficients can differ significantly in beyond Standard Model theories

Provides a benchmark for future experimental precision in Higgs self-coupling measurements

Abstract

We argue that a measurement of the Higgs boson self-coupling becomes particularly meaningful in a large and important class of theories when its sensitivity is within 40\% of its Standard Model value. This constitutes a target for a future impactful experimental achievement. It is derived from recently obtained results of how extreme the differences can be between effective field theory operator coefficients when their origins are from reasonable custodial-violating theories beyond the Standard Model.