FDR, an easier way to NNLO calculations: a two-loop case study

@article{Donati2014FDRAE,
  title={FDR, an easier way to NNLO calculations: a two-loop case study},
  author={A. Donati and R. Pittau},
  journal={The European Physical Journal C},
  year={2014},
  volume={74},
  pages={1-19}
}
In this paper we illustrate the simplifications produced by FDR in NNLO computations. We show with an explicit example that—due to its four-dimensionality—FDR does not require an order-by-order renormalization and that, unlike the one-loop case, FDR and dimensional regularization generate intermediate two-loop results which are no longer linked by a simple subtraction of the ultraviolet (UV) poles in $$\epsilon $$ϵ. Our case study is the two-loop amplitude for $$H \rightarrow \gamma \gamma $$H… Expand
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