Köln 2004 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 17: Electromagnetic and Hadronic Probes II

HK 17.9: Vortrag

Dienstag, 9. März 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