Nuclear Physics & RIKEN Theory Seminar

"In-medium properties of D-mesons at FAIR"

Presented by Laura Tolos, GSI Darmstadt

Friday, April 7, 2006, 2:00 pm — Small Seminar Room, Bldg. 510

We have calculated for the first time the D-meson spectral density at finite temperature within a self-consistent coupled-channel approach, and discuss implications for in-medium effects of produced D-mesons in heavy-ion collisions. Treating the DN interaction within a
selfconsistent coupled-channel calculation generates dynamically the $\Lambda_c$ (2593) resonance. This resonance is the charm counterpart of the $\Lambda$ (1405) resonance generated from the s- wave K-N interaction.
We find that the quasiparticle peak of the D-meson in the medium stays close to the free one, indicating a small change in the effective mass for finite density and temperature. Our result is in stark contrast to
the large changes claimed in previous model calculations based on QCD sum-rules, QMC models or chiral effective lagrangians within the mean-field approximation. Furthermore, the spectral density develops a considerable width due to the coupled-channel structure. The reduced
attraction felt by the D- meson in hot and dense matter together with the large width observed have important consequences for the D-meson production in heavy-ion collisions, in particular for the future CBM and
PANDA experiments at FAIR.

Hosted by: Anna Stasto

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