Report of the Topical Group on Higgs Physics for Snowmass 2021: The Case for Precision Higgs Physics

TL;DR

Future Higgs Factories will significantly enhance precision in Higgs measurements, enabling exploration of BSM physics, dark matter, and fundamental particle properties beyond current capabilities.

Contribution

This report advocates for precision Higgs physics at future colliders, outlining their potential to uncover new physics and improve understanding of fundamental particles.

Findings

Higgs couplings can be measured to a few percent accuracy.

Future colliders will precisely determine Higgs width and self-coupling.

Enhanced measurements will probe BSM physics in the 1-10 TeV range.

Abstract

A future Higgs Factory will provide improved precision on measurements of Higgs couplings beyond those obtained by the LHC, and will enable a broad range of investigations across the fields of fundamental physics, including the mechanism of electroweak symmetry breaking, the origin of the masses and mixing of fundamental particles, the predominance of matter over antimatter, and the nature of dark matter. Future colliders will measure Higgs couplings to a few per cent, giving a window to beyond the Standard Model (BSM) physics in the 1-10 TeV range. In addition, they will make precise measurements of the Higgs width, and characterize the Higgs self-coupling. This report details the work of the EF01 and EF02 working groups for the Snowmass 2021 study.