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Berlin 2005 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 8: Elektromagnetische und Hadronische Proben

HK 8.2: Talk

Friday, March 4, 2005, 16:45–17:00, TU MA001

Determination of the Gluon Polarisation using high-pt hadronpairs at COMPASS — •Sonja Hedicke, H. Fischer, J. Franz, F.H. Heinsius, M. von Hodenberg, D. Kang, O. Kilias, K. Königsmann, D. Matthiä, C. Schill, D. Setter, S. Trippel, and E. Weise — Physikalisches Institut, Universität Freiburg

The COMPASS experiment at CERN is investigating the nucleon spin structure using polarised deep inelastic muon nucleon scattering. One of the main goals of COMPASS is to disentangle the gluon contribution to the nucleon spin.
Photon gluon fusion (PGF) events allow to probe gluon properties. These events can be enriched compared to background processes by requiring two hadrons with high transverse momentum pt. Monte Carlo studies are used to estimate the contribution from PGF and background and thus allow to determine the gluon polarisation from the measured double spin asymmetry.
First results for the gluon polarisation from COMPASS using this method will be presented.
This work is supported by the BMBF.

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