| Sumario: | In pure-glue QCD, gluon–gluon scattering in the J= 0 channel is described by a very simple equation, especially if one considers just the leading contribution to the scattering kernel. Of all components in this kernel, only the three-gluon vertex, V , is poorly constrained by contemporary analyses; hence, calculations of 0 glueball properties serve as a clear window onto the character and form of V . This is important given that many modern calculations of V predict the appearance of an infrared suppression in the scalar function which comes to modulate the bare vertex after the nonperturbative resummation of interactions. Such behaviour is a peculiar prediction; but we find that the suppression is essential if one is to achieve agreement with lattice-QCD predictions for the 0 glueball mass. Hence, it is likely that this novel feature of V is real and has observable implications for the spectrum, decays and interactions of all QCD bound-states.
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