I want to set gauge in all of my calculation with FeynArts and FeynCalc to $\xi$ gauge.

I use $Gauge=ξ but it does not work.

How to change gauge in these packages?


  • 1
    $\begingroup$ FeynArts manual, p. 43 option GaugeRules. I highly recommend reading the manual completely before using FeynArts. This avoids a lot of questions. $\endgroup$
    – vsht
    Commented Dec 11, 2016 at 0:17
  • $\begingroup$ @vsht Thanks for your answer and suggestion. $\endgroup$
    – NaC
    Commented Dec 11, 2016 at 12:12

1 Answer 1

diags = InsertFields[
   CreateTopologies[1, 1 -> 2], {F[4, {3}]} -> {S[1], F[4, {2}]},
   InsertionLevel -> {Classes}, Model -> "SM"];

CreateFeynAmp[diags, PreFactor -> 1/(2 Pi)^4, GaugeRules -> {}]

This provides amplitudes in general $R_\xi$ gauge


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