Münster 2002 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 12: Poster Session: Electromagentic and Hadronic Probes

HK 12.1: Poster

Dienstag, 12. März 2002, 10:30–12:45, Foyer Chemie

Studying Charmed Mesons in Matter — •Olaf N. Hartmann — Gesellschaft für Schwerionenforschung, Darmstadt

The proposed antiproton facility at GSI [1] with beam momenta up to 15 GeV/c will enable investigations of the interaction between particles containing hidden and open charm with nucleons and nuclei. These studies will address questions related to the connection of hadron masses and the spontaneously broken chiral symmetry in QCD. Chiral symmetry is expected to be partially restored in a hot and/or dense nuclear environment, leading to observable modifications of hadronic properties [2,3].

Recent calculations [4] for the D⁺ and D⁻ mesons predict a mass split of the order of 50 MeV and large enhancements of the near threshold production cross section. Another example is the possibility to do comprehensive measurements of the J/ψ-N cross section. Detection of the weakly decaying charmed hadrons requires that secondary vertices can be reconstructed with a resolution of about 100 µm. Therefore, a silicon pixel based microvertex detector is a central component of the detector concept for the proposed antiproton ring at GSI. The physics potential and first simulation results on this detector will be presented.

[1] http://www.gsi.de/GSI-Future/cdr/

[2] T. Yamazaki et.al., Phys.Lett.B 418(1998)246

[3] R. Barth et.al., Phys.Rev.Lett 78(1997)4007

[4] A. Hayashigaki, Phys.Lett.B 487(2000)96