Berlin 2005 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 8: Elektromagnetische und Hadronische Proben
HK 8.6: Vortrag
Freitag, 4. März 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.