J/{psi} at finite density in QCD sum rule analysis
- Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502 (Japan)
For the 'anomalous'J/{psi} suppression in Pb-Pb collision announced by NA50 Collaboration I propose new mechanism accessible to the novel behavior of the data. The point of new idea is to focus on in-medium effects on the masses of mesons containing charmed quarks. In QCD sum rule analysis, I find that the D-meson involving one charmed quark feels more attractive force from the surrounding nucleons than the charmonium composed of two charmed quarks. As a result, it will appear that as the nucleon density increases DD-bar threshold in turn falls below higher-lying charmonium states ({psi}{sup '},{chi}{sub c}) which have the energy levels below the threshold in vacuum. Finally, also for the low-lying J/{psi} state, a larger decay channel to the threshold could be opened up. Therefore, this mechanism can qualitatively explain some features of the anomalous J/{psi} suppression without advent of deconfinement phase.
- OSTI ID:
- 21210322
- Journal Information:
- AIP Conference Proceedings, Vol. 494, Issue 1; Conference: Conference on new directions in quantum chromodynamics, Seoul (Korea, Republic of); Kyungju (Korea, Republic of), 26 May - 18 Jun 1999; Other Information: DOI: 10.1063/1.1301692; (c) 1999 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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