Diphoton decay of the higgs from the Epstein–Glaser viewpoint

@article{Duch2021DiphotonDO,
  title={Diphoton decay of the higgs from the Epstein–Glaser viewpoint},
  author={Paweł Duch and Michael D{\"u}tsch and Jos{\'e} M. Gracia-Bond́ıa},
  journal={The European Physical Journal C},
  year={2021}
}
We revisit a nearly 10-year old controversy on the diphoton decay of the Higgs particle. To a large extent, the controversy turned around the respective merits of the regularization techniques employed. The novel aspect of our approach is that no regularization techniques are brought to bear: we work within the Bogoliubov–Epstein–Glaser scheme of renormalization by extension of distributions. Solving the problem actually required an expansion of this method’s toolkit, furnished in the paper. 
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