Abstract
The size of the gluon distribution at small x has important implications for phenomenology at future high energy hadron-hadron and lepton-hadron colliders. We extend a recent global parton distribution fit to investigate the constraints on the gluon from deep inelastic and prompt photon data. In particular, we estimate a band of allowed gluon distributions with qualitatively different small- x behaviour and study the implications of these on a variety of cross sections at high energy pp and ep colliders.
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