Abstract
One of the main goals of the COMPASS experiment at CERN is the determination of the gluon polarisation in the nucleon, G/G. It is determined from spin asymmetries in the scattering of 160 GeV/c polarised muons on a polarised LiD target. The gluon polarisation is accessed by the selection of photon-gluon fusion (PGF) events. A very clean selection of PGF events can be obtained with charmed mesons in the final state. Their detection is based on the reconstruction of D ? and D 0 mesons in the COMPASS spectrometer. The analysis method for the first measurement of G/G from the open charm channel is described. The result from COMPASS for the 2002-2004 data taking period is shown.
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