2000/01/31 by Arata Hayashigaki · 1 citation
Physics and Astronomy · #hep-ph #nucl-th
paper · pdf · doi:10.1016/s0370-2693(00)00760-7
published as Phys.Lett. B487 (2000) 96-103 · 17 pages (revtex), 2 figures, Phys. Lett. B in press
arxiv created 2000/06/20 · arxiv updated 2009/11/30
We evaluate the mass shift of isospin-averaged D-meson in the nuclear medium. Borel-transformed QCD sum rules are used to describe an interaction between the D-meson and a nucleon by taking into account all the lowest dimension-4 operators in the operator product expansion (OPE). We find at normal matter density the D-meson mass shift is about 10 times (∼ 50 MeV) larger than that of J/ψ. This originates from the fact that the dominant contribution in the OPE for the D-meson is the nucleon matrix element of mcqq, where mc is the charm-quark mass and q denotes light quarks. We also discuss that the mass shift of the D-meson in nuclear matter may cause the level crossings of the charmonium states and the DD threshold. This suggests an additional mechanism of the J/ψsuppression in high energy heavy-ion collisions.