MadGraph5_aMC@NLO

Setting xi_cut

Asked by Christian Weiss

In FKS, a tuning parameter ξ_cut can be used in the regularization of divergences, see e.g. eq. (4.36) in arXiv:0908.4272.
Inspecting the code, I have the impression that the default value in Madgraph is ξ_cut = 0.5. Is this correct? How can I set
a different value?

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English Edit question
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MadGraph5_aMC@NLO Edit question
Assignee:
Rikkert Frederix Edit question
Solved by:
Christian Weiss
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Rikkert Frederix (frederix) said : 		#1

Dear Christian,

These technical parameters can be set in SubProcesses/fks_powers.inc. Note that the current version of the code there is not a 1-to-1 implementation of the formulas of 0908.4272, and the xicut dependence might differ.

best,
Rikkert

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Christian Weiss (christian-weiss-g) said : 		#2

Thanks, that's what I wanted to know.