Testing Higgs Self-couplings at e^+e^- Linear Colliders

TL;DR

This paper explores methods to measure Higgs self-couplings at high-luminosity e^+e^- linear colliders by analyzing various double Higgs production channels to reconstruct the Higgs potential.

Contribution

It provides a comprehensive analysis of neutral Higgs pair production channels to probe Higgs self-couplings at future linear colliders.

Findings

Multiple production channels can effectively measure Higgs self-couplings.

Double Higgs-strahlung and fusion processes are promising for this purpose.

Results support the feasibility of reconstructing the Higgs potential experimentally.

Abstract

To establish the Higgs mechanism sui generis experimentally, the self-energy potential of the Higgs field must be reconstructed. This task requires the measurement of the trilinear and quadrilinear self-couplings, as predicted, for instance, in the Standard Model or in supersymmetric theories. The couplings can be probed in multiple Higgs production at high-luminosity e^+e^- linear colliders. Complementing earlier studies to develop a coherent picture of the trilinear couplings, we have analyzed the production of pairs of neutral Higgs bosons in all relevant channels of double Higgs-strahlung, associated multiple Higgs production and WW/ZZ fusion to Higgs pairs.