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arXiv · 0707.3879

Chemical Equilibrium in Collisions of Small Systems

I. Kraus·J. Cleymans·H. Oeschler·K. Redlich·S. Wheaton
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Abstract

The system-size dependence of particle production in heavy-ion collisions at the top SPS energy is analyzed in terms of the statistical model. A systematic comparison is made of two suppression mechanisms that quantify strange particle yields in ultra-relativistic heavy-ion collisions: the canonical model with strangeness correlation radius determined from the data and the model formulated in the canonical ensemble using chemical off-equilibrium strangeness suppression factor. The system-size dependence of the correlation radius and the thermal parameters are obtained for p-p, C-C, Si-Si and Pb-Pb collisions at sqrt(s_NN) = 17.3 AGeV. It is shown that on the basis of a consistent set of data there is no clear difference between the two suppression patterns. In the present study the strangeness correlation radius was found to exhibit a rather weak dependence on the system size.

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I. Kraus, J. Cleymans, H. Oeschler, K. Redlich, S. Wheaton. 2007-07-26. Chemical Equilibrium in Collisions of Small Systems. https://doi.org/10.1103/physrevc.76.064903

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