Hello, I'm trying to use Feyncalc 9.3 to do some tree level calculations in unitary gauge but I cannot seem to get it to work correctly.
Let's say I am just looking at the Z exchange diagrams for WW->WW scattering. Each of these should have a Z propagator that looks like ~ (g_{\mu,\nu} - k_{\mu}k_{\nu}/mz^{2}) in unitary gauge. However even with unitary gauge loaded, the amplitudes returned by feyncalc only include the g_{\mu,\nu} pieces.
I have tried using examples that are included and all of these amplitudes have the same problem.
Thank you.
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