I want to set gauge in all of my calculation with FeynArts and FeynCalc to $\xi$ gauge.
I use $Gauge=ξ but it does not work.
How to change gauge in these packages?
Thanks.
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1$\begingroup$ FeynArts manual, p. 43 option GaugeRules. I highly recommend reading the manual completely before using FeynArts. This avoids a lot of questions. $\endgroup$– vshtCommented Dec 11, 2016 at 0:17
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$\begingroup$ @vsht Thanks for your answer and suggestion. $\endgroup$– NaCCommented Dec 11, 2016 at 12:12
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1 Answer
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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
