New physics effect on the top-Yukawa coupling at ILC

Understand

Measurement of the top-Yukawa coupling is important to understand the fermion mass generation mechanism and dynamics of electroweak symmetry breaking.

• We discuss the top quark anomalous couplings which can be described by higher dimensional operators.
• We investigate the process $e^-e^+ \to W^-W^+\nu\bar\nu \to t \bar t \nu\bar\nu$ to study the contribution of the anomalous top-Higgs coupling to the cross section.
• The effect of the dimension-six top-Higgs interaction on the cross section can be a few hundred percent greater than the SM prediction.