Name: fjob_at_HIDDEN-E-MAIL Date: 07/01/01-04:47:41 PM Z
As far as I can see there’s nothing wrong with DiracOrder.
What’s happening is just that (see http://www.feyncalc.org/Polarization/index.html) the contraction of a momentum frou-vector and the corresponding polarization vector is automatically set to zero.
That is, transversality is assumed. If you don’t want that, use some other name than Polarization[…] for the polarization vector.
Hope this helps.
Frederik Orellana