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

Vorschau

Inhaltsverzeichnis, Datei (56 KB)
Leseprobe, Datei (90 KB)

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.