Measurement of The Gluon Polarisation Through High $p_T$ Hadron Production in COMPASS

One of the missing keys in the present understanding of the spin structure of the nucleon is the contribution from the gluons: the so called gluon polarisation. This quantity can be determined in DIS through the Photon-Gluon Fusion (PGF) process, in which two analysis methods may be used: (i) identifying open charm events or (ii) selecting events with high $p_T$ hadrons. The data used in the present work were collected by the COMPASS Experiment, where a naturally polarised muon beam of 160 GeV, impinging on a polarised nucleon fixed target, is used. The results for the gluon polarisation from high $p_T$ are presented. The gluon polarisation result for high $p_T$ hadrons is divided, for the first time, into three independent $x_G$ bins at leading order (LO). A new weighted method based on a neural network approach is used.