D mesons in nuclear matter:: A DN coupled-channel equations approach

A set of coupled two-body scattering equations is solved for the DN system embedded in an isosymmetric nuclear matter. The in-medium behavior of charmed D mesons, (D+,D-0), is investigated from the self-consistent solution within this scheme. The effective meson-baryon Lagrangian in charm quantum number one sector, the key ingredient in the present study, is adopted from a recent model by Hofmann and Lutz that has aimed at combining the charmed meson degree of freedom in a consistent manner with chiral unitary models. After a critical examination, the original model is modified in several important aspects, such as the method of regularization, to be more consistent and practical for our objective. The resultant interaction is used to reproduce the position and width of the s-wave Lambda(c)(2593) resonance in the isospin zero DN channel. In the isospin one channel, it generates a rather wide resonance at similar to 2770 MeV. The corresponding in-medium solution is then sought by incorporating Pauli blocking and the D- and pi-meson dressing self-consistently. At normal nuclear matter density, the resultant Lambda(c)(2593) is found to stay narrow and shifted at a lower energy, whereas the I=1 resonance is lowered in position as well and broadened considerably.