Heidelberg 2015 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 40: Hadron Structure and Spectroscopy 9
HK 40.2: Vortrag
Mittwoch, 25. März 2015, 15:00–15:15, T/SR19
Improved LO extraction of the gluon polarisation using COMPASS data — •Malte Wilfert — for the COMPASS collaboration — Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, Johann-Joachim-Becher-Weg 45, 55099 Mainz
The COMPASS experiment at the M2 beamline of the CERN SPS has taken data with a polarised muon beam (E=160 GeV) scattering of a polarised LiD target from 2002 to 2006. The events in the DIS region are re-analysed to extract simultaneously the gluon polarisation Δ g/g and the leading process asymmetry from the same data using a Neural Network approach. The new method of extracting Δ g/g will be presented. The main feature of this method is a reduction of both the systematic and the statistical uncertainty of the gluon polarisation obtained in LO. The new result is in good agreement with the already published one in PLB 718 (2013) 922 and will be presented in three bins of gluon momentum fraction xg.
Supported by BMBF under the contract 05P12UMCC1 and GRK Symmetry Breaking (DFG/GRK 1581)