Next-to-Leading QCD and Finite Lifetime Effects in e+e− → t¯tH (Tienda española)

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One important task of the International Linear Collider (ILC) will be to determine
the couplings of the Higgs boson. Since the top-quark is so heavy,
the top Yukawa coupling is an especially interesting quantity. It is measured
via top-pair associated Higgs production. Within the effective theory velocity
Non-Relativistic QCD (vNRQCD) we calculated the next-to-leading
logarithmic (NLL) QCD corrections as well as the NLL finite lifetime effects,
which are relevant for the first phase of the ILC with a collision energy of
500GeV. The results show a strong enhancement of the total cross section
relative to the naive Born computation and indicate a theoretical uncertainty
of approximately 5% for the top Yukawa coupling measurement.