Prospects for Precision Higgs Physics at Linear Colliders

TL;DR

This paper discusses the potential of linear e+e- colliders for precise, model-independent measurements of Higgs boson properties, including mass, decay modes, and couplings, across various energy regimes.

Contribution

It provides a comprehensive summary of the prospects for Higgs physics at linear colliders based on detailed simulation studies from CLIC and ILC designs.

Findings

Precise Higgs mass measurement near Z-Higgs threshold.

Direct measurement of Higgs decay branching ratios, including invisible decays.

Ability to measure small branching ratios like Higgs to muon pairs.

Abstract

A linear e+e- collider provides excellent possibilities for precision measurements of the properties of the Higgs boson. At energies close to the Z-Higgs threshold, the Higgs boson can be studied in recoil against a Z boson, to obtain not only a precision mass measurement but also direct measurements of the branching ratios for most decay modes, including possible decay to invisible species. At higher energies, the Higgs boson coupling to top quarks and the Higgs boson self-coupling can also be measured. At energies approaching 1 TeV and above, the rising cross section for Higgs production in WW fusion allows the measurement of very small branching ratios, including the branching ratio to muon pairs. These experiments make it possible to determine the complete profile of the Higgs boson in a model-independent way. The prospects for these measurements are summarized, based on the results of detailed simulation studies performed within the frameworks of the CLIC conceptual design report and the ILC technical design report.