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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
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*> qslash=Contract[GA[\alpha],FourVector[p,\alpha]]
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*> for all of them.
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*> One the result for follwoing calculation
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*> Tr[gamma5slash[p1]slash[p2]slash[p3]slash[p4]slash[p5]slash[p6]slash[p7]slash[p8]]
*

*> is
*

*> \epsilon^{p1p2p3p4}
*

*> instead of
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*> \epsilon^{\alpha1\alpha2\alpha3\alpha4}
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*> 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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