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Dresden 2000 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 21: Elektromagnetische und hadronische Proben III

HK 21.2: Talk

Thursday, March 23, 2000, 14:45–15:00, B 154

Dilepton Production in Photonuclear Reactions — •S. Schadmand — II. Physikalisches Institut, Universität Gießen

Preliminary results of the observation of dileptons produced in photonuclear reactions are presented. The goal is to investigate virtual Compton scattering below the ρ-meson production threshold. This should enable the extraction of electromagnetic form factors in the time-like region. Several targets (LH2, C, CA, and Pb) were employed in combination with a photon beam with a maximum energy of 880 MeV. Dileptons were detected with the electromagnetic spectrometer TAPS in parallel to the ongoing meson production experiments at the tagged-photon facility at MAMI-B (Mainz).
In γ+p reactions the elementary processes can be observed while in-medium effects might be observed with the heavier targets. The experiments are of exploratory nature. In particular, the contribution of the Bethe-Heitler process is a concern. As a first step in this study, πo- and η-Dalitz decays have been measured.
Eventually, the results should complement measurements of dilepton production in heavy ion reactions, aiming at an understanding of the in-medium behavior of vector mesons.

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