Köln 2004 – scientific programme
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HK: Physik der Hadronen und Kerne
HK 17: Electromagnetic and Hadronic Probes II
HK 17.9: Talk
Tuesday, March 9, 2004, 18:00–18:15, B
Azimuthal Distributions and the Cahn Effect at COMPASS — •Inga Ludwig, H. Fischer, J. Franz, S. Hedicke, F.H. Heinsius, M. von Hodenberg, D. Kang, K. Königsmann, D. Matthiä, J. Metzger, C. Schill, D. Setter, S. Trippel, and E. Weise — Physikalisches Institut, Universität Freiburg
One goal of the COMPASS experiment at CERN is the investigation of transverse momenta of the quarks in the nucleon. In SIDIS the intrinsic transverse momentum of the quark generates an asymmetry in the azimuthal angle φ of the leading hadron. Here φ is measured with respect to the direction of the virtual photon and the lepton-scattering plane. This asymmetry causes a cosφ- and cos2φ-modulation in the count rates, which has been predicted by Cahn in 1987.
In COMPASS a 160 GeV muon beam is scattered off a 6LiD target. The status of the data analysis on this subject will be presented.
Work supported by BMBF