Name: Vladyslav Shtabovenko (email_not_shown)
Date: 05/10/16-04:50:06 PM Z


Hi,

well this is of course a different issue. Thanks for the bug report. I
think that it should be now fixed in the master branch:

Import["https://raw.githubusercontent.com/FeynCalc/feyncalc/master/install.m"]
InstallFeynCalc[]

I also added a small helper function TarcerToFC that allows to convert
from TFI/TVI/TJI/TAI/TBI back to the FeynAmpDenominator-notation.

So while we get zero from

TarcerRecurse[
 TFI[d, P^2, {0, 0, 1, 3,
   0}, {{2, 0}, {1, 0}, {0, 0}, {0, 0}, {1, 0}}]]

we can also do

TarcerToFC[
 TFI[d, P^2, {0, 0, 1, 3,
   0}, {{2, 0}, {1, 0}, {0, 0}, {0, 0}, {1, 0}}], {q1, q2}]
FDS[%, q1, q2]

which gives the same, as the integral itself is scaleless.

Cheers,
Vladyslav

Am 09.05.2016 um 13:40 schrieb Yan:
> Hi,
>
> Thanks!
>
> It also happens with Tarcer in Feyncalc 9 running with mathematica 10.4.
>
> Try TarcerRecurse[+TFI[d,P^2,{0,0,1,3,0},{{2,0},{1,0},{0,0},{0,0},{1,0}}]].
> The out put is (2 P^2 Subsuperscript[F, {Tarcer`Private`n1,Tarcer`Private`m1}{Tarcer`Private`n2,Tarcer`Private`m2}{0,0}{0,0}{1,0}, (d) 01110])/(d+2).
>
> Best,
> Yan
>



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