Berlin 2005 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 24: Elektromagnetische und Hadronische Proben

HK 24.7: Vortrag

Dienstag, 8. März 2005, 15:45–16:00, TU MA001

Relativistic treatment of the N^*(1520) and its decay channels — •Lukas Jahnke and Stefan Leupold — Institut für Theoretische Physik, Universität Giessen, Germany

It has turned out that the N^*(1520) is rather important to study in-medium changes of hadronic properties [1]. The analysis of elementary reactions provides here an important ingredient. The presented approach aims at a description of the pion-induced production of dileptons on the nucleon in the N^*(1520) region. A brief introduction to the relativistic treatment of free and interacting spin-3/2 particles is presented paying special attention to the issue of how to maintain the correct number of degrees of freedom [2]. Consistent couplings of the N^*(1520) to pion-nucleon and rho-nucleon are presented. The corresponding self energies are determined to obtain the full N^*(1520) propagator.

[1] M. Post, S. Leupold and U. Mosel, Nucl. Phys. A 741, 81 (2004)

[2] V. Pascalutsa and R. Timmermans, Phys. Rev. C 60, 042201 (1999)