We study the changes in the partial decay widths of excited charmonium states into DD̄, when the D-meson mass decreases in nuclear matter, taking the internal structure of the hadrons into account. Calculations within the 3P0 model for Ψ(3686) and Ψ(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 x states, we generally expect stronger modifications of the widths. The relevance of the x widths for J/Ψ suppression in heavy ion collision is discussed. These phenomena could be explored in experiments at the future accelerator facility at GSI.
|Number of pages||8|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - 2002 Nov 21|
Bibliographical noteFunding Information:
We thank D.-O. Riska for useful comments. S.H.L. gratefully acknowledges hospitality of GSI, where this work was initiated and completed. The work was supported in part by the KOSEF Grant 1999-2-111-005-5, and the Korean Ministry of Education Grant 2000-2-0689.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics