Two-loop QCD helicity amplitudes for $g\,g \to Z\,g$ and $g\,g \to
Z\,γ$ [PDF]
Thomas Gehrmann, Lorenzo Tancredi, Erich WeihsWe compute the helicity amplitudes for the processes $gg\to Zg$ and $gg\to Z\gamma$ to two loops in massless QCD. The perturbative expansion of these processes starts only at the one-loop level, such that our results are a crucial ingredient to the NLO corrections to $Z\gamma$ and $Z+$jet production through gluon fusion.View original: http://arxiv.org/abs/1302.2630
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