Measurement of Higgs couplings and self-coupling at the ILC

Abstract

In the Standard Model (SM) the couplings of the Higgs boson to SM particles and itself (self-couplings) are uniquely specified once the masses of the particles in question as well as the Higgs boson mass are given. Precision measurements of these couplings in the future collider experiments are the key to either verifying the mechanism of the electroweak symmetry breaking in the SM or uncovering physics beyond the SM. This article gives an overview of how various Higgs couplings will be measured at the ILC. Emphasis is put on the ILC's capability of performing fully model independent determination of absolute $HZZ$ and $HWW$ couplings, the Higgs total width, and hence various other Higgs couplings, which cover essentially all the crucial ones including the top-Yukawa coupling $Htt$ and the trilinear Higgs self-coupling ${\lambda }_{HHH}$. The strategy to get the best precision measurements at the ILC is through staged running, which provides many independent $\sigma \times \mathrm{Br}$ measurements for different production channels and at different energies. A method of global fitting is discussed to utilize all of the available information and to derive combined precisions.

To appear in the proceedings of The European Physical Society Conference on High Energy Physics (EPS-HEP 2013), Stockholm, Sweden, 18-24 July, 2013

References in corpus (5)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• Measuring the top Yukawa coupling at the ILC at sqrt(s) = 500 GeV
• Evaluation of measurement accuracies of the Higgs boson branching fractions in the International Linear Collider
• Physics at the ILC with focus mostly on Higgs physics

Cited by in corpus (2)

• Testing Electroweak Baryogenesis with Future Colliders
• Quark-flavour violation in $h^0\to b\bar{b}$ in the MSSM at one-loop level