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We report on the feasibility of measuring the top Yukawa coupling in theprocess: $e^+e^-\to t\bar{t}H$. This measurement is crucial to test the massgeneration mechanism for matter particles. Since the cross section for thisprocess attains its maximum around $\sqrt{s}=700 $GeV, most of the past studieswere done assuming this energy region. It has been pointed out, however, thatthe QCD threshold correction enhances the cross section significantly and mightenable its measurement at $\sqrt{s}=500 $GeV, which will be accessible alreadyin the first phase of the ILC project. We have implemented this thresholdenhancement into our $t\bar{t}H$ event generator and carried out Monte Carlosimulations. Our results show that $t\bar{t}H$ events can be observed with asignificance of $4.1\,\sigma$ with no beam polarization and $5.4 \sigma$ withthe $e^-$ and $e^+$ beam polarization combination: $(-0.8,+0.3)$.

A study of top-quark Yukawa coupling measurement in e+e- -> t tbar H at sqrt(s) = 500 GeV