Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2002-07-02
Phys.Lett. B548 (2002) 153-160
Physics
Nuclear Physics
Nuclear Theory
12 pages, 3 figures; allowed for two independent oscillator parameters for the charmonium states and D mesons, results are not
Scientific paper
10.1016/S0370-2693(02)02855-1
We study the changes in the partial decay widths of excited charmonium states into $D \bar{D}$, when the D meson mass decreases in nuclear matter, taking the internal structure of the hadrons into account. Calculations within the 3P0 model for $\psi(3686)$ and $\psi(3770)$ imply that naive estimates of the in-medium widths based only on phase space are grossly exaggerated. Due to nodes in the wave functions, these states may even become narrow at high densities, if the D meson mass is decreased by about 200 MeV. For the $\chi$ states, we generally expect stronger modifications of the widths. The relevance of the $\chi$ widths for $J/\psi$ suppression in heavy ion collision is discussed. These phenomena could be explored in experiments at the future accelerator facility at GSI.
Friman Bengt
Lee Su Houng
Song Taesoo
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