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One of the main goals of the COMPASS experiment at CERN is the determinationof the gluon polarisation in the nucleon, Delta G/G. It is determined from spinasymmetries in the scattering of 160 GeV/c polarised muons on a polarised LiDtarget. The gluon polarisation is accessed by the selection of photon-gluonfusion (PGF) events. A very clean selection of PGF events can be obtained withcharmed mesons in the final state. Their detection is based on thereconstruction of D* and D0 mesons in the COMPASS spectrometer. The analysismethod for the first measurement of Delta G/G from the open charm channel isdescribed and the result from COMPASS for the 2002-2004 data taking period ispresented.

Determination of Delta G/G from Open Charm events at COMPASS