Gluon induced contributions to Zγ production at hadron colliders -: art. no. 034016

We study the contribution of gluon induced partonic subprocesses to Zgamma pair production at hadron colliders. These processes contribute only at next-to-next-to-leading order but are potentially enhanced by two factors of the gluon parton densities. However, we find that their contribution is modest and that next-to-leading order calculations give reliable predictions.