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HK: Physik der Hadronen und Kerne

HK 27: Theorie

HK 27.3: Talk

Tuesday, March 8, 2005, 14:30–14:45, TU MA005

Canonical suppression in microscopic and stochastic transport models — •Oliver Fochler, Sascha Vogel, Marcus Bleicher, and Carsten Greiner — Institut für Theoretische Physik, Johann Wolfgang Goethe Universität Frankfurt am Main, 60054 Frankfurt am Main

It is investigated whether current microscopic transport models are able to reproduce a canonical suppression of conserved quantities for small reaction volumes correctly. A suppression in the yields especially for strange hadrons due to small reaction volumes has been theoretically advocated within thermal hadron gas descriptions over the last twenty years. This might be particularly important to understand the recent experimental results for strange particle production in heavy ion collisions at SIS and for non-central collisions at SPS energies. We have therefore simulated a pion-gas having a volume-limited production and annihilation crosssection for ππ ↔ KK using both a microscopical and a stochastical transport model. The kaons are restricted to a given volume, whereas the pions can diffuse freely within a much larger heat bath. It is found that the microscopic transport description can account for the canonical suppression of U(1)-conserved charges.