Mass modification of D-meson in hot hadronic matter

Abstract

We evaluate the in-medium $D$ and $\bar{D}$-meson masses in hot hadronic matter induced by interactions with the light hadron sector described in a chiral SU(3) model. The effective Lagrangian approach is generalized to SU(4) to include charmed mesons. We find that the D-mass drops substantially at finite temperatures and densities, which open the channels of the decay of the charmonium states (${\Psi }^{\prime }$, ${\chi }_c$, $J/\Psi$) to $D\bar{D}$ pairs in the thermal medium. The effects of vacuum polarisations from the baryon sector on the medium modification of the $D$-meson mass relative to those obtained in the mean field approximation are investigated. The results of the present work are compared to calculations based on the QCD sum-rule approach, the quark-meson coupling model, chiral perturbation theory, as well as to studies of quarkonium dissociation using heavy quark potential from lattice QCD.

Comments: 18 pages including 7 figures, minor revision of the text, figure styles modified, to appear in Phys. Rev. C