Münster 2011 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 41: Struktur und Dynamik von Kernen VI

HK 41.3: Vortrag

Mittwoch, 23. März 2011, 17:15–17:30, O-1

Strange particles production in antiproton-nucleus collisions — •Alexei Larionov^1,2, Theodoros Gaitanos¹, and Ulrich Mosel¹ — ¹Institut für Theoretische Physik, Universität Giessen, Germany — ²Russian Research Center Kurchatov Institute, 123182 Moscow, Russia

The p N annihilation is a powerful source of strangeness production. Even for stopped antiprotons, about 5% of p p annihilation events contain a KK pair. Thus, p annihilation on a nucleus is well suited for the studies of the interactions of kaons and antikaons with nuclear medium. In particular, hyperon production in p A interactions is very sensitive to the properties of the antikaon-nucleon interaction in nuclear medium. Within the Giessen Boltzmann-Uehling-Uhlenbeck transport model [1], we analyse the experimental data on Λ and K_S production in p A collisions at p_lab=0.2−4 GeV/c taken at BNL, LEAR, and KEK. A satisfactory overall agreement on Λ production is reached. However, our calculations tend to overestimate K_S production, especially at low beam momenta, which has been also observed in earlier transport studies of p A interactions [2]. We also study the Ξ⁻ hyperon production focusing on the efficiencies of the Ξ⁺ and 2K⁺ triggers in view of the forthcoming PANDA experiment.

This work was supported by BMBF.

[1] http://gibuu.physik.uni-giessen.de/GiBUU

[2] J. Cugnon, P. Deneye, and J. Vandermeulen, Phys. Rev. C 41, 1701 (1990).