Measuring the Higgs Yukawa Couplings at a Next Linear Collider

TL;DR

This paper explores measuring Higgs Yukawa couplings at future linear colliders through heavy quark associated production, including QCD corrections, to improve understanding of Higgs interactions in the Standard Model and supersymmetry.

Contribution

It provides a detailed analysis of Higgs production with heavy quarks at high energies, incorporating QCD corrections and assessing sensitivity to Yukawa couplings in both Standard Model and supersymmetric scenarios.

Findings

Associated production with t-tbar is highly sensitive to top-Higgs Yukawa coupling.

Resonant contributions can significantly enhance Higgs production with b-bbar in supersymmetry.

QCD corrections are crucial for accurate cross-section predictions.

Abstract

We investigate the inclusive production of a Higgs boson with a pair of heavy quarks (t-tbar b-bbar), in e^+e^- collisions at high energies, sqrt(s)=500 GeV and sqrt(s)=1 TeV. We consider both the Standard Model and the supersymmetric case. In both cases O(alpha_s) QCD corrections are included. The associated production of a Higgs boson with a t-tbar pair is extremely sensitive to the top-Higgs Yukawa coupling and may allow the precision measurement of this coupling. In some regions of the supersymmetric parameter space the associated production of a Higgs boson with a b-bbar pair receives large resonant contributions and can have a significant rate.