If you say that something does not work but do not provide any code to
reproduce the problem, there is no way I (or someone else) can help you.
This rule applies to any software, not just FeynCalc.
The approach to the evaluation of PaVe depends very much on the
calculation. There are calculations with some many relevant kinematical
parameters (masses and momenta) that the full symbolic result would be
too huge to make any sense of it, so one should use numerical packages.
If there are only few parameters involved and the integrals are rather
simple, one could press on for the symbolic evaluation. Again, as I have
no clue what you are doing, I can't tell you what is the best strategy
to proceed.
Cheers,
Vladyslav
Am 09.12.2016 um 15:02 schrieb Natthawin Cho:
> I tried your suggestion already and it works.
>
> However, the result contains a lot of Passarino-Veltman integrals.
>
> I found the definition of these integral in the manual but the terms with indices other than zero are quite complicate.
>
> I found that we can extract these integrals by Write2 function.
>
> However, I get nothing from this function. How to solve this problem?
>
> Another question is are there any way to get the analytic expression directly from OneLoop result? or I have to calculate Passarino-Veltman integrals term by term.
>
> Thanks.
>
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