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comment Gauge invariance of gg->gg scattering amplitude?
Ok, I figured it out :) I did not simplify enough. I had to apply momentum conservation in FORM several times, replacing each momentum vector by momentum conservation and also mandelstam variable replacements. The gauge check with $\epsilon\to\epsilon+p$ doesn't work yet, but I think I need some $\mathrm{SU}(3)$ algebra simplifications for that.
Jul
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comment Gauge invariance of gg->gg scattering amplitude?
I think it must be with an arbitrary prefactor, because you can compute $p_\mu \mathcal{A}^\mu$ and this must vanish (with an arbitrary prefactor).
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asked Gauge invariance of gg->gg scattering amplitude?