Abstract
New double-spin asymmetry data from the COMPASS experiment at CERN are presented. The data are used to determine the polarized gluon distribution Δ G / G ( x ) , via three different techniques. Next-to-leading order QCD fits to the nucleon polarized structure functions indicate that the first moment of Δ G / G ( x ) is small (either positive or negative) and compatible with zero. This observation is corroborated by three measurements of Δ G / G ( x ) , based on the photon-gluon fusion process.
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