There's a bug in FeynCalc: it calculates Tr[DiracSlash[a].DiracSlash[a]] as
a^2 but the correct result is 4*a^2.
Instead the calculation of Tr[DiracSlash[a].DiracSlash[b]] is correct.
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Roberto Sghedoni
Dipartimento di Fisica dell'Università degli Studi di Parma
Parco Area delle Scienze 7/A
43100 Parma
Tel. +39.0521.905493
Fax +39.0521.905223
e-mail: sghedoni@fis.unipr.it
web: www.fis.unipr.it/~sghedoni/
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