PaXImplicitPrefactor is an option for
PaXEvaluate. It specifies the prefactor that does not show
up explicitly in the input expression, but is understood to appear in
front of every 1-loop integral. For technical reasons,
PaXImplicitPrefactor should not depend on the number of
dimensions D. Instead you should explicitly specify what
D is (e.g. 4-2 Epsilon). The default value is
1.
If the standard prefactor 1/(2
\pi)^D is implicit in your calculations, use
ImplicitPrefactor -> 1/(2 Pi)^(4 - 2 Epsilon) .