FeynCalc manual (development version)

ToSFAD

ToSFAD[exp] converts all propagator denominators written as FAD or FeynAmpDenmoninator[...,PropagatorDenominator[...],...] to SFAD or FeynAmpDenmoninator[...,StandardPropagatorDenominator[...],...] respectively.

See also

Overview, FAD, SFAD.

Examples

ToSFAD[FAD[p]]

\frac{1}{(p^2+i \eta )}

ToSFAD[FAD[p]] // StandardForm

(*FeynAmpDenominator[StandardPropagatorDenominator[Momentum[p, D], 0, 0, {1, 1}]]*)
ToSFAD[FAD[{p, m}]]

\frac{1}{(p^2-m^2+i \eta )}

ToSFAD[FAD[{p, m}]] // StandardForm

(*FeynAmpDenominator[StandardPropagatorDenominator[Momentum[p, D], 0, -m^2, {1, 1}]]*)
ToSFAD[FAD[{p + q, m, 2}]]

\frac{1}{((p+q)^2-m^2+i \eta )^2}

ToSFAD[FAD[{p + q, m, 2}]] // StandardForm

(*FeynAmpDenominator[StandardPropagatorDenominator[Momentum[p + q, D], 0, -m^2, {1, 1}], StandardPropagatorDenominator[Momentum[p + q, D], 0, -m^2, {1, 1}]]*)