Köln 2004 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 11: Poster Session: Electromagnetic and Hadronic Probes

HK 11.4: Poster

Dienstag, 9. März 2004, 13:30–15:30, Foyer

Charmonium absorption in nuclear matter . — •Alexander Sibirtsev¹, Kazuo Tsushima², and Anthony W. Thomas³ — ¹IKP-TH, FZJ, Juelich — ²Georgia University, USA — ³Adelaide University, Australia

J/Ψ dissociation in collisions with nucleons is studied within a boson exchange model and the energy dependence of the dissociation cross section is calculated from the threshold for Λ_cD production to high energies. We illustrate the agreement of our results with calculations based on short distance QCD and Regge theory. The compatibility between our calculations and the data on J/Ψ photoproduction on a nucleon is discussed. We evaluate the elastic J/Ψ+N cross section using a forward dispersion relation and demonstrate the overall agreement with the predictions from QCD sum rules. Our results are compatible with the phenomenological dissociation cross section evaluated from the experimental data on J/Ψ production from γ+A, p+A and A+A collisions.

The experimental studies on J/Ψ dissociation in antiproton-nucleus collisions are planned by PANDA Collaboration at HESR. Our results show which sensitivity is required from future experiments in order to determine dissociation cross section and allow for detail simulation of the PANDA detector.