I\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\'m working with loop integral involve terms like GS[p], and the moment \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\"p\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\" need to be put as zero. But I found something strange:
In:= GS[p] /. p -> 0
or you can see it more clearly using the StandardForm
In:= GS[p] /. p -> 0 // StandardForm
The result should be zero though. It looks like FeynCalc or Mathematica treat the GS as a function but without definition of GS =0.
Furthermore, when the OneLoop involves the GS, it will become GA
In:= OneLoop[p, GS[p] /. p -> 0]
Similar thing happens on the SPD[k,p], it will be zero when you replace one of the moment to be zero, but
In:= Spinor[k, MT] SPD[k, p] /. p -> 0 //
Out= 0 \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\[CurlyPhi](k,MT)
or in StandardForm
Out= SPD[0, k] Spinor[Momentum[k], MT, 1]
And this \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\"0\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\" or SPD[0,k] will become GA.GA after applied the OneLoop function in my loop integral.
Could you please look into this case?
Thank you very much!
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