München 2006 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 28: Elektromagnetische und Hadronische Sonden

HK 28.5: Vortrag

Mittwoch, 22. März 2006, 15:00–15:15, F

Longitudinal Λ and Λ polarization in the COMPASS experiment — •Donghee Kang, H. Fischer, J. Franz, S. Hedicke, F.H. Heinsius, F. Hermann, M. von Hodenberg, K. Königsmann, F. Nerling, C. Schill, D. Setter, A. Vossen, E. Weise, and H. Wollny — Physikalisches Institut, Universität Freiburg

At the COMPASS experiment at CERN Λ and Λ particles are produced in deep inelastic scattering processes with high statistics. Preliminary results from data collected in the current fragmentation region during 2002-2003 are presented. The main focus of the research is the understanding of the longitudinal Λ and Λ polarization and the spin transfer mechanism from quarks to hardrons through the fragmentation process. The Λ and Λ polarization can be studied by measuring the acceptance corrected angular distribution of its decay products. The results of the Λ and Λ longitudinal polarization and spin transfer provides useful information to test different model predictions which describe spin effects in hyperon production and the quark-antiquark asymmetry of the nucleon spin structure. We will compare our results with other measurements and discuss the dependence of the polarization on various kinematical variables. The project is supported by BMBF.