$\Delta G$ from high $p_{T}$ events at COMPASS

One of the main goals of the COMPASS experiment is a precise determination of $\Delta G/G$. This will lead to better understanding of the nucleon spin structure. The polarization of the gluons in the nucleon is measured by tagging the Photon Gluon Fusion (PGF) process in scattering of polarized muons off a polarized deuteron target. One of the methods used to tag PGF events is a selection of a pair of high $p_{T}$ hadrons in the final state. In the analysis presented here, the $Q^{2} <$ 1 (GeV/c)$^{2}$ region is considered. The preliminary value of $\Delta G/G$, $\frac{\Delta G}{G} =$ 0.016 $\pm$ 0.058($stat.$) $\pm$ 0.055($syst.$), is currently the most precise measurement available.