FeynAmpDenominatorExplicit[exp]
changes each occurrence of PropagatorDenominator[a,b]
in exp into 1/(SPD[a,a]-b^2)
and replaces FeynAmpDenominator
by Identity
.
Overview, FeynAmpDenominator, PropagatorDenominator.
[{q, m}, {q - p, 0}]
FAD
[%]
FeynAmpDenominatorExplicit
% // FCE // StandardForm
Notice that you should never apply FeynAmpDenominatorExplicit
to loop integrals. Denominators in a proper loop integral should be written as FeynAmpDenominator
s. Otherwise, the given integral is assumed to have no denominators and consequently set to zero as being scaleless.
[FVD[q, mu] FAD[{q, m}, {q - p, 0}], q] TID
[FeynAmpDenominatorExplicit[FVD[q, mu] FAD[{q, m}, {q - p, 0}]], q] TID