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HK: Fachverband Hadronen und Kerne

HK 24: Hadron Structure and Spectroscopy I

HK 24.6: Vortrag

Dienstag, 17. März 2009, 15:45–16:00, H-ZO 20

Time-like form factors of the nucleon — •Julia Guttmann¹, Andreas Metz², and Marc Vanderhaeghen¹ — ¹Institut für Kernphysik, Johannes Gutenberg-Universität, 55099 Mainz — ²Temple University, Philadelphia, USA

The electromagnetic form factors are an important tool to explore the structure of the nucleon. The extraction of space-like form factors from electron-proton scattering shows a discrepancy between data of unpolarized Rosenbluth measurements and of polarization experiments. This difference can be explained by means of two-photon exchange corrections. In the time-like region no comparable calculations have been done up to now for the corresponding processes.

We investigate the influence of two-photon exchange in the reaction pp → e⁺e⁻ with regard to determination of the time-like form factors and present calculations for future experiments at the PANDA@FAIR project.