Mainz 2012 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 39: Hadronenstruktur und -spektroskopie

HK 39.2: Vortrag

Donnerstag, 22. März 2012, 17:00–17:15, RW 2

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

The future PANDA experiment at FAIR has a strong potential to study particle production in p-nucleus collisions. We perform the Giessen Boltzmann-Uehling-Uhlenbeck model simulations of p -nucleus interactions at the beam momenta from zero to about 10 GeV/c [1,2]. The different mechanisms of the hyperon and hypernuclei production are studied, including the ΛΛ hypernuclei production by Ξ⁻ interactions with a secondary target. We find a systematic overprediction of experimental data on K_S⁰ production in our calculations, in-particular, for light targets. The Λ+Σ⁰ hyperon yields are described rather well. Their rapidity spectra at several GeV/c beam momentum are shown to be quite sensitive to the hyperon-nucleon cross sections. Finally, we discuss the Ξ (S=-2) hyperon production and argue that the Ξ⁻ rapidity spectra can serve as a very sensitive test for a hypothetic QGP-fireball scenario of p annihilation on a nucleus.

Work supported by BMBF.

[1] A.B. Larionov, T. Gaitanos, U. Mosel, arXiv:1107.2326

[2] T. Gaitanos, A.B. Larionov, H. Lenske, U. Mosel, arXiv:1111.5748