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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 8.6: Talk

Friday, March 4, 2005, 17:45–18:00, TU MA001

Studies of High-Pt Hadrons at COMPASS — •Daniel Matthiä, H. Fischer, J. Franz, S. Hedicke, F.H. Heinsius, M. von Hodenberg, D. Kang, O. Kilias, K. Königsmann, C. Schill, D. Setter, S. Trippel, and E. Weise — Physikalisches Institut, Universität Freiburg

One of the goals of the COMPASS experiment at CERN is to study the spin structure of nucleons, especially the gluon spin polarization. This is investigated in deep inelastic scattering of polarized muons off a polarized LiD target.
A powerful tool to study the gluon polarization in the nucleon is provided by the selection of photon-gluon fusion (PGF) events. The requirement of events which contain hadron jets with large transverse momentum pt suppresses contributions from leading order DIS and QCD Compton and enhances the fraction of PGF events.
of the process of photon gluon fusion (PGF) in deep inelastic scattering. In PGF processes the back to back production of a quark and an anti-quark causes a large number of hadrons with high transversal momentum pt with respect to the virtual photon.
The status of the analysis of events with high-pt hadrons will be presented. Cross sections for pion production and charged hadrons will be discussed in comparison to theoretical predictions.
This work is supported by the BMBF.

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