Measurement of the gluon polarization \Delta G/G at COMPASS
  One of the key objectives of the COMPASS experiment at CERN is the determination of the gluon contribution to the nucleon spin. The gluon polarization is measured via photon-gluon fusion in deep-inelastic scattering of 160 GeV/c polarized muons on a polarized 6LiD solid-state target. Photon-gluon fusion is tagged by the observation of charmed mesons or the production of hadron pairs with large transverse momenta p_t. The status of the analysis of the D0 and D0* events and of the high-p_t hadron pairs is shown. The gluon polarization \Delta G/G has been determined from the asymmetry of high-p_t hadron pairs with Q^2>1 GeV/c^2 in an analysis of the 2002/03 data as \Delta G/G=0.06 \pm 0.31 (stat.) \pm 0.06 (syst.). 
C. Schill (on behalf of the COMPASS collaboration)