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We consider double $gg\rightarrow g$ production in the presence of a bias onthe unintegrated gluon distribution of the colliding hadron or nuclei. Suchbias could be due to the selection of configurations with a greater number ofgluons or higher mean transverse momentum squared or, more generally, due to amodified spectral shape of the gluon distribution in the hadrons. Hence, weconsider reweighted functional averages over the stochastic ensemble of small-xgluons. We evaluate explicitly the double inclusive gluon transverse momentumspectrum in high-energy collisions, and their azimuthal correlations, for a fewsimple examples of biases.

Double inclusive small-x gluon production and their azimuthal correlations in a biased ensemble