https://doi.org/10.1140/epjc/s10052-014-2978-0
Regular Article - Theoretical Physics
Higher order QCD results for the fermionic contributions of the Higgs-boson decay into two photons and the decoupling function for the 
renormalized fine-structure constant
Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Emil-Hilb-Weg 22, 97074 , Würzburg, Germany
* e-mail: Christian.Sturm@physik.uni-wuerzburg.de
Received:
20
April
2014
Accepted:
10
July
2014
Published online:
9
August
2014
We compute the decoupling function of the renormalized fine-structure constant up to four-loop order in perturbative QCD. The results are used in order to determine the related top-quark contributions to the Higgs-boson decay into two photons in the heavy top-quark mass limit to order 
.
© SIF and Springer-Verlag Berlin Heidelberg, 2014
