Berlin 2005 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 8: Elektromagnetische und Hadronische Proben
HK 8.2: Vortrag
Freitag, 4. März 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.