PaXEpsilonBar corresponds to DimRegEpsilon in Package-X, i.e. 1/PaXEpsilonBar means 1/Epsilon - EulerGamma + Log[4Pi].
PaXEpsilonBar
DimRegEpsilon
1/PaXEpsilonBar
1/Epsilon - EulerGamma + Log[4Pi]
Overview.