Berlin 2005 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 8: Elektromagnetische und Hadronische Proben
HK 8.1: Vortrag
Freitag, 4. März 2005, 16:30–16:45, TU MA001
The Determination of the Gluon Polarisation via D Mesons at COMPASS — •Martin von Hodenberg, H. Fischer, J. Franz, S. Hedicke, F.H. Heinsius, D. Kang, O. Kilias, K. Königsmann, D. Matthiä, C. Schill, D. Setter, S. Trippel, and E. Weise — Physikalisches Institut, Albert-Ludwigs-Universität Freiburg
COMPASS is an experiment at the SPS at CERN, which is aiming at a better
understanding of the spin structure of the nucleon, by performing a
measurement of the
gluon polarisation Δ G/G.
In order to achieve this goal, polarised muons with an energy of 160 GeV
are
scattered from a polarised fixed LiD-target and events are studied where
the
underlying
process is the fusion of a virtual photon with a gluon from the nucleon.
This interaction can produce cc-pairs, which result in charmed
mesons
in the final state.
In average there are 1.2 D0 or D0 mesons per
cc-pair.
These mesons are
detected in the COMPASS spectrometer via their decay products, where the
most
interesting decay is
D0→ K− π+ and accordingly D0→ K+
π−.
The presentation will inform about the current status of the ongoing
analysis.
This project is supported by BMBF.