Name: Vladyslav Shtabovenko (email_not_shown)
Date: 05/07/15-01:59:37 AM Z


Dear Manuel,

thanks for you patience. I'm investigating the issue.

Cheers,
Vladyslav

Am 06.05.2015 um 14:38 schrieb manuel J.Vicente:
> Dear Vladyslav,
> thanks for your prompt answer. I've also found another problem with OneLoop. It fails in the 8.2.0 and in today's nightly version. Results from default options and OneLoopSimplify->True differ.
>
> Notice the first line: bb=k. It corresponds to an external momentum. Changing its name to anything alphabetically after p (e.g. bb=x) seems to solve the problem??
>
> ===================================================================
> << FeynCalc`
> bb = k;
> ScalarProduct[bb, p1] = 0; ScalarProduct[bb, bb] = 0;
> ScalarProduct[p1, p1] = m^2; ScalarProduct[p2, p2] = m^2;
> ScalarProduct[p1, r] = 0; ScalarProduct[bb, r] = 0;
> ScalarProduct[bb, p2] = 0; ScalarProduct[r, p2] = 1;
> ScalarProduct[p1, p2] = 0;
>
> amp = SPD[r, z] SPD[bb, z] SPD[p2, z] SPD[p1,
> z] FAD[{z, 0}, {p1 + bb - z, m}, {p2 - z, m}, {p1 - z, m}];
>
> FI; OneLoop[z, amp] // PaVeReduce
>
> (-I/24)*m^2*Pi^2
>
> OneLoop[z, amp, OneLoopSimplify -> True]
>
> 0
> ======================================
>
> best regards and thanks again!
>
> M.J. Vicente
>



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