Abstract
A direct measurement of the gluon polarisation Δg g is mandatory for a further clarification of the internal spin structure of the nucleon. We propose a new muon experiment at CERN to measure the gluon polarisation using open charm production, which is linked to the gluon distribution via the photon-gluon fusion process. Experimentally this requires to measure the cross section asymmetry for D meson production in polarised deep inelastic muon scattering from a polarised target. The experiment is similar to the one of the SMC but requires additional detectors and a general upgrade. The gluon polarisation could be determined with a precision of δ( Δg g ) = 0.15 . Simultaneously other semi-inclusive asymmetries can be studied.
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