Tübingen 2003 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 20: Physik mit schweren Ionen II
HK 20.3: Gruppenbericht
Dienstag, 18. März 2003, 16:30–17:00, E
Quarkonium properties in hot and dense matter (*) — •Alberto Polleri1,2, Thorsten Renk1,2, Roland Schneider1,2, and Wolfram Weise1,2 — 1Physik Department der Technische Universität München, D-85747 Garching, GERMANY — 2ECT∗, Villa Tambosi, I-38050 Villazzano (Trento), ITALY
Recent lattice computations of quarkonium properties at finite
temperature, both of spectral functions and of energy levels,
have shed some new light on the possible explanations of
anomalous suppression in nuclear collisions. In order to make
contact between idealized lattice results and measurements, we
study the interplay of static screening and of dynamic dissociation
due to collisions. We develop a model to describe the propagation
of quarkonium in a quark-gluon plasma, solving the Bethe-Salpeter
equation for the heavy quark-antiquark pair interacting with a
realistic confining potential. The latter is screen dynamically,
reducing the possibility of binding for some of the bound states
while collisions with the plasma constituents are able to dissociate
quarkonia. The derived spectral functions are shown to broaden
and their peak positions have a characteristic dependence on the
plasma temperature. Our results match the lattice ones in the limit
of large available times for evolution in an infinite medium.
Applications to realistic scenarios involving collisions between
heavy nuclei will be extensively discussed
(*) Work supported in part by BMBF and GSI.