Name: Vladyslav Shtabovenko Date: 01/17/17-10:40:48 AM Z
It works, but when GaugeXi is not 1 you end up with propagators raised
to integer powers that require IBP reduction to be further simplified.
For example,
FAD[{q, m, 4}]
is just a tadpole raised to 4th power, but without IBP FeynCalc would
write it as a D-function
OneLoop[q, FAD[{q, m, 4}]]
I \[Pi]^2 D0[0, 0, 0, 0, 0, 0, m^2, m^2, m^2, m^2]
which is clearly an overkill.
Have a look at
https://github.com/FeynCalc/feynhelpers/blob/master/Examples/QCD/QCDThreeGluonVertexOneLoop.m
for some ideas how to deal with such integrals using FeynHelpers. TID
is way more convenient for that than OneLoop.
Cheers,
Vladyslav
> The FeynCalc Manual has the following note about the OneLoop
function:
>
> NOTICE: While OneLoop is restricted to ‘t Hooft Feynman….
>
> In what sense ithe OneLoop resticted to the t’Hooft gauge
_GaugeXi->1? Does it also work in the physical gauge _GaugeXi->0?
Could you give an example in general gauge that OneLoop cannot
handle?
>
> Many thanks
> Jon Palmer