Open charm in nuclear matter at finite temperature

L. Tolós, A. Ramos, T. Mizutani
2008 Physical Review C  
We study the properties of open-charm mesons (D and D̅) in nuclear matter at finite temperature within a self-consistent coupled-channel approach. The meson-baryon interactions are adopted from a type of broken SU(4) s-wave Tomozawa-Weinberg terms supplemented by an attractive scalar-isoscalar attraction. The in-medium solution at finite temperature incorporates Pauli blocking effects, mean-field binding on all the baryons involved, and π and open-charm meson self-energies in a self-consistent
more » ... anner. In the DN sector, the Λ_c and Σ_c resonances, generated dynamically at 2593 MeV and 2770 MeV in free space, remain close to their free-space position while acquiring a remarkable width due to the thermal smearing of Pauli blocking as well as from the nuclear matter density effects. As a result, the D meson spectral density shows a single pronounced peak for energies close to the D meson free-space mass that broadens with increasing matter density with an extended tail particularly towards lower energies. The D̅ potential shows a moderate repulsive behavior coming from the dominant I=1 contribution of the D̅ N interaction. The low-density theorem is, however, not a good approximation for the D̅ self-energy in spite of the absence of resonance-hole contributions close to threshold in this case. We speculate the possibility of D-mesic nuclei as well as discuss some consequences for the J/Ψ suppression in heavy-ion collisions, in particular for the future CBM experiment at FAIR.
doi:10.1103/physrevc.77.015207 fatcat:akf53rnsxbcf5auqo5pcqryrwi