Tübingen 2003 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 6: Physik mit schweren Ionen I
HK 6.2: Gruppenbericht
Montag, 17. März 2003, 16:15–16:45, E
Do we have a chance to touch quark-hadron phase boundary at future GSI collider? — •Eugene Zabrodin1, Christian Fuchs1, Amand Faessler1, Zhong-Dao Lu2,3, and Larisa Bravina4 — 1Institut für Theoretische Physik, Universität Tübingen — 2China Institute of Atomic Energy, Beijing 102413, China — 3China Center of Advance Science and Technology, Beijing 100080, China — 4Institute for Nuclear Physics, Moscow State University, Russia
The experimental data on hadron yields and ratios in central heavy-ion collisions at energies from SIS to RHIC are analyzed within a two-source statistical model of an ideal hadron gas. A comparison with the standard thermal model is given.The two sources, which can reach the chemical and thermal equilibrium separately and may have different temperatures, particle and strangeness densities, and other thermodynamic characteristics, represent the expanding system of colliding heavy ions, where the hot central fireball is embedded in a larger but cooler fireball. Analysis of available experimental data at energies below 80 AGeV suggests that the quark-hadron phase boundary, obtained in lattice QCD calculations, can be probed in the central zone of central gold-gold collisions at energies around 40 AGeV. A violation of the energy-per-particle scaling for the central source is also predicted.
[1] Z.-D. Lu, A. Faessler, C. Fuchs, E. Zabrodin, Phys. Rev. C66, 044905 (2002); J. Phys. G28, 2127 (2002).
[2] L. Bravina, A. Faessler, C. Fuchs, Z.-D. Lu, E. Zabrodin, Phys. Rev. C66, 014906 (2002).