FeynCalc manual (development version)

SO

SO[q] is a four-dimensional scalar product of OPEDelta with q. It is transformed into Pair[Momentum[q], Momentum[OPEDelta] by FCI.

See also

Overview, FCI, OPEDelta, Pair, ScalarProduct, SOD.

Examples

SO[p]

\Delta \cdot p

SO[p - q]

\Delta \cdot (p-q)

SO[p] // FCI // StandardForm

(*Pair[Momentum[OPEDelta], Momentum[p]]*)