Bochum 2009 – scientific programme

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HK: Fachverband Hadronen und Kerne

HK 23: Heavy Ion Collisions and QCD phases

HK 23.2: Group Report

Tuesday, March 17, 2009, 14:30–15:00, H-ZO 10

Strangeness production and thermal equalibration in the near-threshold heavy ion collisions in FOPI — •Krzysztof Piasecki — Physikalisches Institut, Universität Heidelberg, Germany — Institute of Experimental Physics, Univ. of Warsaw, Poland

In Heavy Ion collisions at 1-2A GeV dense baryonic systems are produced at moderate temperatures. Investigation of the production of Φ [1] mesons and Σ^* [2], K^* [3] strange resonances plays an important role in understanding the equilibration mechanism and quantification of the temperature and baryochemical potential reached in the collision.

Particle yield ratios at freeze out can be described surprisingly well by thermal model without suppression of strangeness production. On the other hand, the concept of thermalization is checked using dynamical models.

An overview of the experimental findings on the short-lived strange particles from the FOPI detector in GSI will be presented.

This work is supported in part by BMBF 06HD190I and EU/FP6 I3 HP.

[1] A. Mangiarotti et al., Nucl. Phys. A 714 (2003) 89

[2] X. Lopez et al., Phys. Rev. C 76, 055203(R) (2007)

[3] X. Lopez (FOPI), J. Phys. G: Nucl. Part. Phys. 35 (2008) 044020