MadGraph5_aMC@NLO

SM in MG which gauge is used?

Asked by Arian Abrahantes

This a naive question but just to be sure which is the gauge fixed for SM computations in MG?. From the reading of mG and FeynRules I guess it is the "Lorenz Gauge", am I right?

thanks in advance,

arian

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Arian Abrahantes (arian-abrahantes) said : 		#1

or "unitary gauge" for LO calculations as for the SM as in MG4.

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Olivier Mattelaer (olivier-mattelaer) said : 		#2

The default is the same as MG4/HELAS
i.e. unitary gauge for massive particle and light cone gauge for the massless one.

Now it is possible to use Feynmand Gauge in MG5
(by using the command “set gauge Feynman”)

Cheers,

Olivier
On May 2, 2014, at 7:32 PM, Arian Abrahantes <email address hidden> wrote:

> Question #248077 on MadGraph5_aMC@NLO changed:
> https://answers.launchpad.net/mg5amcnlo/+question/248077
>
> Arian Abrahantes posted a new comment:
> or "unitary gauge" for LO calculations as for the SM as in MG4.
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

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Arian Abrahantes (arian-abrahantes) said : 		#3

thanks a lot olivier, deeply grateful, have nice weekend, arian