Münster 2002 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 44: Theory VIII

HK 44.5: Talk

Thursday, March 14, 2002, 17:30–17:45, C

Hadron formation in high energy photonuclear reactions — •Thomas Falter and Ulrich Mosel — Institut für Theoretische Physik, Universität Gießen, Germany

Photo- and electroproduction on nuclei offer a great opportunity to investigate the physics of hadron formation. The results are usually interpreted using simple Glauber theory to describe the final state interactions (FSI) of the produced particles. We show that this purely absorptive treatment of the FSI might lead to wrong estimates of formation time and color transparency effects. We use a semi-classical transport model based on the BUU equation which allows for a realistic coupled channel description of the FSI that goes far beyond simple Glauber theory. The model has already been successfully used to describe heavy ion collisions, pion and proton induced reactions as well as photon and electron induced reactions in the resonance region. We present a possibility to account for coherence length effects within this model, which makes it possible to describe photo- and electroproduction at higher energies. As an example we will discuss inclusive and exclusive meson photoproduction in the energy range from 1 to 7 GeV.

Work supported by DFG.