Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 21: Heavy Ions II

HK 21.8: Talk

Tuesday, March 9, 2004, 17:30–17:45, F

Rapidity and transverse momentum dependence of π-π Bose-Einstein correlations measured at 20,30,40,80 and 158 AGeV beam energy (Stefan Kniege, Christopher Alt, Dominik Flierl) — •S. Kniege¹, C. Alt¹, C. Blume¹, P. Buncic¹, P. Dinkelaker¹, D. Flierl¹, V. Friese^2,3, M. Gazdzicki¹, M. Kliemant¹, I. Kraus², B. Lungwitz¹, C. Meurer¹, M. Mitrovski¹, S. Radomski², R. Renfordt¹, A. Richard¹, A. Sandoval², R. Stock¹ und H. Ströbele¹ — ¹Institut für Kernphysik, Universität Frankfurt — ²Gesellschaft für Schwerionenforschung (GSI), Darmstadt — ³Fachbereich Physik der Universität, Marburg

The space time conditions during the last stages of a heavy ion collision define the HBT radii. Within hydrodynamic inspired models these observables are related to crucial parameters describing the dynamics of such a collision. The dependence of the measured radii on transverse momentum can be related to quantities like temperature, strength of transverse expansion and life time of the fireball.
Various measurements at the SPS energy scan programme suggest a qualitative change in several observables at 20-30 AGeV. We will present the rapidity as well as the kt dependence of pion HBT radii at 20 and 30 AGeV recently measured by the NA49 experiment. The new results will be compared to measurements at 40,80 and 160 AGeV beam energy.