View source for Two-loop provider

[[Category:Theory software]]
[[Category:Matrix element generator]]
A '''two-loop provider''' (or '''two-loop program''') is a specialised software for generating two-[[Loop|loop]] [[Amplitude|amplitudes]] for [[perturbative quantum field theory]] calculations. They are a special case of [[external amplitude providers]]. Two-loop amplitudes contribute to [[NNLO QCD|NNLO]] (and higher order) [[Cross section|cross sections]] as well as the [[NLO QCD|NLO]] cross sections of [[loop-induced]] processes.

== List of two-loop providers ==
* [[GoSam]] using [https://github.com/mppmu/hhgrid hhgrid] as an extension<ref>S. P. Jones, ''Automation of 2-loop Amplitude Calculations'', PoS LL2016 (2016) 069, [http://arxiv.org/abs/arXiv:1608.03846 arXiv:1608.03846]</ref>

== References ==
<references />

== See also ==
* [[One-loop provider]]