Berlin 2005 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 26: Theorie

HK 26.6: Vortrag

Dienstag, 8. März 2005, 15:45–16:00, TU MA004

Correlations in quark matter — •Frank Frömel, Stefan Leupold, and Ulrich Mosel — Institut für Theoretische Physik, Universität Giessen, Germany

The spectral functions of light quarks and mesons in quark matter can be investigated in a fully self consistent approach. Using the pointlike interaction of the Nambu-Jona-Lasinio model, relations between quark self energies and spectral functions are the basis for an iterative calculation beyond the usual mean-field and RPA approximations. We consider a full series of RPA type diagrams with dressed quarks for the quark collision rate. These diagrams can be interpreted as dynamically generated mesons (σ, π) coupled to the quarks. To obtain a self consistent scheme, the results are fed back into the quark self energies. This method allows, in particular, to investigate the role of short-range correlations in quark matter. Calculations have been performed for vanishing temperature and finite chemical potential. The results clearly show effects of collisional broadening in the spectral functions of quarks and mesons. Also, other deviations from mean field calculations will be discussed.