Name: Davide Racco (email_not_shown)
Date: 01/26/17-12:45:37 PM Z


Hi,
first of all I thank you for making available this extremely useful package.
I would like to report what could be a possible bug in the function PaVeReduce in FeynCalc 9.2.0.

If I try to PaVeReduce the function
PaVe[1, 2, {0, s, 0}, {mf^2, mf^2, mf^2}]
with FeynCalc 8.2.0 (I had it installed on my previous laptop) the output is
(mf^2*PaVe[0, {0, 0, s}, {mf^2, mf^2, mf^2}])/s + 1/(2 s)
while now with FeynCalc 9.2.0 I obtain just the first term
(mf^2*PaVe[0, {0, 0, s}, {mf^2, mf^2, mf^2}])/s

I checked what should be the right answer by evaluating the three expressions with LoopTools 2.13 (for mf->173, s->400), and I obtain respectively
-1.39467*10^-6
-1.39467*10^-6
-0.00125139
therefore the output of FC 8 seems to be the right one.

Thanks for your help,
Davide Racco



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