Next-to-leading QCD and finite lifetime effects in e e-ttH

by Cailin Farrell

Description

One important task of the International Linear Collider (ILC) will be to determinethe couplings of the Higgs boson. Since the top-quark is so heavy, the top Yukawa coupling is an especially interesting quantity. It is measuredvia top-pair associated Higgs production. Within the effective theory velocityNon-Relativistic QCD (vNRQCD) we calculated the next-to-leadinglogarithmic (NLL) QCD corrections as well as the NLL finite lifetime effects, which are relevant for the first phase of the ILC show more with a collision energy of500GeV. The results show a strong enhancement of the total cross sectionrelative to the naive Born computation and indicate a theoretical uncertaintyof approximately 5% for the top Yukawa coupling measurement. show less