Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2010-10-12
Physics
High Energy Physics
High Energy Physics - Experiment
prepared for the proceedings of the DSPIN09 - XIII Workshop on High Energy Spin Physics, Dubna, Russia, September 1 - 5, 2009
Scientific paper
One of the goals of the COMPASS experiment is the determination of the gluon polarisation \Delta G/G, for a deep understanding of the spin structure of the nucleon. In DIS the gluon polarisation can be measured via the Photon-Gluon-Fusion (PGF) process, identified by open charm production or by selecting high p_T hadron pairs in the final state. The data used for this work were collected by the COMPASS experiment during the years 2002-2004, using a 160 GeV naturally polarised positive muon beam scattering on a polarised nucleon target. A new preliminary result of the gluon polarisation \Delta G/G from high p_T hadron pairs in events with Q^2>1 (GeV/c)^2 is presented. In order to extract \Delta G/G, this analysis takes into account the leading process \gamma q contribution together with the PGF and QCD Compton processes. A new weighted method based on a neural network approach is used. A preliminary \Delta G/G result for events from quasi-real photoproduction (Q^2<1 (GeV/c)^2) is also presented.
for the COMPASS Collaboration
Silva Laura
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