Name: Rolf Mertig Date: 05/03/17-12:38:17 PM Z
Hi,
I am using the latest development version of FeynCalc.
Then:
Needs[“FeynCalc`”];
DD = I*GS[p] - g*GA[\[Mu]] .
QuantumField[A, \[Mu]] - m -
QuantumField[\[Sigma]] -
I*GA[5]*SUNT[a] . QuantumField[\[Pi]f,
a];
DDh = (-I)*GA[0] . GS[p] . GA[0] -
g*GA[0] . GA[\[Nu]] . GA[0] .
QuantumField[A, \[Nu]] - m -
QuantumField[\[Sigma]] + I*GA[5] .
SUNT[b] . QuantumField[\[Pi]f, b];
hhh = DDh . DD;
hhh2 = TR[SUNTrace[hhh]]
works.
Originally (last century) I assumed that color traces are always done
before dirac traces. It definitely it easier. Maybe the current
maintainer of the code base (Vladyslav) can comment if the reverse
should and could also work. I am not so sure it is needed.
Rolf