Volume 104, Number 2, October 2013
|Number of page(s)||6|
|Published online||20 November 2013|
Chemical freeze-out of strange particles and possible root of strangeness suppression
1 Bogolyubov Institute for Theoretical Physics - Metrologichna str. 14 B, Kiev 03680, Ukraine
2 Department of Physics, University of Cape Town - Ronebosch 7701, South Africa
3 FIAS, Goethe-University - Ruth-Moufang Str. 1, 60438 Frankfurt upon Main, Germany
4 Kurchatov Institute, Russian Research Center - Kurchatov Sqr., Moscow, 123182, Russia
5 Laboratory for Information Technologies, JINR - Joliot-Curie str. 6, 141980 Dubna, Russia
Received: 24 August 2013
Accepted: 22 October 2013
Two approaches to treat the chemical freeze-out of strange particles in the hadron resonance gas model are analyzed. The first one employs their non-equillibration via the usual factor and such a model describes the hadron multiplicities measured in nucleus-nucleus collisions at AGS, SPS and RHIC energies with . Surprisingly, at low energies we find not the strangeness suppression, but its enhancement. Also we suggest an alternative approach to treat the strange particle freeze-out separately, but with the full chemical equilibration. This approach is based on the conservation laws which allow us to connect the freeze-outs of strange and non-strange hadrons. Within the suggested approach the same set of hadron multiplicities can be described better than within the conventional approach with .
PACS: 25.75.-q – Relativistic heavy-ion collisions / 25.75.Dw – Particle and resonance production
© EPLA, 2013
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