Berlin 2005 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 30: Elektromagnetische und Hadronische Proben

HK 30.5: Talk

Tuesday, March 8, 2005, 17:45–18:00, TU MA001

The Cahn-Effect at COMPASS — •Eric Weise, H. Fischer, J. Franz, S. Hedicke, F.H. Heinsius, M. von Hodenberg, D. Kang, K. Königsmann, D. Matthiä, C. Schill, D. Setter, and S. Trippel — Physikalisches Institut, Universität Freiburg, Germany

COMPASS is a fixed target experiment at CERN studying nucleon spin structure in polarised deep inelastic muon nucleon scattering and investigating hadron spectroscopy using hadron beams. One of the goals of COMPASS is to analyse the transverse momenta of the quarks in the nucleon. In semi inclusive deep inelastic scattering these intrinsic transverse momenta of the quarks generate an asymmetry in the azimuthal angle φ of the hadron, to which the struck quark fragments. This angle is measured with respect to the direction of the virtual photon and the lepton-scattering plane. The asymmetry causes cosnφ-modulations in the count rates, which has been predicted by Cahn in 1987. The status of the analysis on this subject will be presented. This work is supported by the BMBF.