München 2006 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 3: Elektromagnetische und Hadronische Sonden

HK 3.4: Vortrag

Montag, 20. März 2006, 15:15–15:30, G

Omega Production in Proton- and Pion-Nucleus Reactions with HADES^* — •Björn Spruck and Dipak Mishra — 2. Physikalisches Institut, Universität Gießen

One of the exiting topics in nuclear physics is the modification of experimentally observable properties of vector mesons such as mass and width in a nuclear medium. First evidence for nuclear modifications of vector mesons was found in ultrarelativistic heavy ion collisions [1]. A mass change of the ω in photoproduction was recently observed by CBELSA/TAPS [2]. A standard approach is the measurement of the electromagnetic decay of light vector mesons with dilepton spectroscopy. Future experiments with the HADES detector at GSI will address this question in π-A and p-A reactions, where the ω has a resonable probability to decay inside the nucleus. Progress in the preparation of the π-beam and the experiments will be reported. In parallel simulations with a HSD transport model including the full detector acceptance are carried out to compare expected signal to background ratios in π-A and p-A reactions. Results of these simulations will be presented.

[1] G. Agakichiev et al., PRL 75 1272 (1995)

[2] D. Trnka et al., PRL 94 192303 (2005) ^*This work is supported by BMBF and GSI