Sorry, I do not understand your problem.
\epsilon^{p1p2p3p4} is just a shortcut for
\epsilon^{\alpha1\alpha2\alpha3\alpha4}
p1_{\alpha1}p2_{\alpha2}p3_{\alpha3}p4_{\alpha4}
For example
FV[p1, mu] FV[p2, nu] FV[p3, rho] FV[p4, si] LC[mu, nu, rho, si]
Contract[%]
What other contractions do you want to do?
Cheers,
Vladyslav
Am 02.09.2017 um 18:05 schrieb Mahdi Sadegh:
> Dear Organizers,
> Thanks for your extremely applicable package.
> I use DiracTrac to calculate trace of gamma5 with eight four-vectors slash. FeynCalc gives me Levicivita tensor with indices which are name of four-vectors. It doesn't give result with doing all contractions. Even I define my four-vectors with following form
> qslash=Contract[GA[\alpha],FourVector[p,\alpha]]
> for all of them.
> One the result for follwoing calculation
> Tr[gamma5slash[p1]slash[p2]slash[p3]slash[p4]slash[p5]slash[p6]slash[p7]slash[p8]]
> is
> \epsilon^{p1p2p3p4}
> instead of
> \epsilon^{\alpha1\alpha2\alpha3\alpha4}
> p1_{\alpha1}p2_{\alpha2}p3_{\alpha3}p4_{\alpha4}............
> I use feyncalc 9.2.0 , mathematica 10 and Macintash 10.12.1
> How can solve this problem?
>
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