Abstract
The determination of the gluon polarization Δ G / G represents one of the main goals of the COMPASS Collaboration at CERN. This quantity is experimentally accessible by selecting photon gluon fusion (PGF) events in the scattering of a polarized 160 GeV muon beam off a polarized 6 LiD target. At COMPASS the PGF mechanism is tagged by means of three different channels: charmed meson production and high- p T hadron pairs in either electro-production ( Q 2 > 1 GeV 2 ) or quasi-real photo-production ( Q 2 1 GeV 2 ). The status of the different analyses and the Δ G / G results obtained from the 2002-04 data samples are presented. The most precise measurement comes from the hight- p T quasi-real photo-production, yielding a small gluon polarization.
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