Name: Vladyslav Shtabovenko (email_not_shown)
Date: 11/26/14-09:19:57 PM Z


Hi,

EpsEvaluate doesn't normally expand momenta, but actually it's just one
additional command that you need:

Eps[Momentum[p1], Momentum[p2], Momentum[p3],
    Momentum[p1 + p2]] // MomentumExpand // EpsEvaluate

Cheers,
Vladyslav

Am 26.11.2014 um 14:42 schrieb Lingxiao Xu:
> Hi,
> Thanks for all the help!
> So my real problem is how to modify the code which I posted in my
> first message to prevent all these trivial contractions of LeviCivita
> tensors from appearing. Since for the process which I want to evaluate,
> 9 terms would come out. I just don't want to replace the trivial
> LeviCivita tensors one by one.
> Furthermore, after checking FeynCalc manual, I think the function
> EpsEvaluate might help. But it doesn't work correctly. For example,
> "LC[][p1, p2, p3, p1 + p2] // EpsEvaluate"‍
> gives" -\[Epsilon]^(p1p2p1+p2p3) " rather
> than" -\[Epsilon]^(p1p2p1p3)+‍-\[Epsilon]^(p1p2p2p3)".‍‍
>
> I am using FeynCalc 8.2.0 with Mathematica 9.0 on Win7(64bits).
> Thanks for more help.
>
> Best Regards!
> Lingxiao
>



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