FeynCalc manual (development version)

SUNNToCACF

SUNNToCACF is an option of SUNSimplify and CalcColorFactor. If set to True, the Casimir operator eigenvalues CA (=n_c) and CF (=(n_c^2-1)/(2 n_c)) are reconstructed from the result in terms of n_c using heuristics. The reconstruction is not always perfect, but mostly sufficient at tree and one-loop level.

See also

Overview, SUNSimplify, SUNN, CA, CF.

Examples

SUNSimplify[SUNDelta[SUNIndex[a], SUNIndex[a]]]

2 C_A C_F

SUNSimplify[SUNDelta[SUNIndex[a], SUNIndex[a]], SUNNToCACF -> False]

N^2-1