COMPASS results on the gluon polarization in the nucleon

Two measurements of the gluon polarisation, $\Delta G$, inside the nucleon, performed by the COMPASS experiment, are presented. The described methods differ in the tagging of the Photon Gluon Fusion process, which is sensitive to $\Delta G/G$; the first uses the detection of charmed mesons, while the second one $-$ high-$p_{T}$ hadron pairs in the final state.The obtained preliminary results are $\Delta G/G = -$ 0.39 $\pm$ 0.24 (stat.) $\pm$ 0.11 (sys.) at $< x_{g} >$ 0.1 for the open-charm analysis and $\Delta G/G =$ 0.08 $\pm$ 0.10 (stat.) $\pm$ 0.05 (sys.) at $< x_{g} >$ $\approx$ 0.08 for high-$p_{T}$ case in the regime Q$^{2} >$ 1 $(GeV/c)^{2}$.