Strangeness production in antiproton-nucleus collisions

TL;DR

This study uses the GiBUU transport model to analyze antiproton-nucleus collisions, focusing on strange particle production, and compares theoretical predictions with experimental data to understand hyperon behavior in nuclear media.

Contribution

It provides a detailed analysis of strange particle production in antiproton-nucleus collisions using the GiBUU model, highlighting areas of agreement and discrepancy with experimental data.

Findings

Overall good agreement with experimental data

Discrepancy in $K^0_S$ production for specific collision conditions

Insights into hyperon production relevant for future experiments

Abstract

Antiproton annihilations on nuclei provide a very interesting way to study the behaviour of strange particles in the nuclear medium. In low energy $\bar p$ annihilations, the hyperons are produced mostly by strangeness exchange mechanisms. Thus, hyperon production in $\bar p A$ interactions is very sensitive to the properties of the antikaon-nucleon interaction in nuclear medium. Within the Giessen Boltzmann-Uehling-Uhlenbeck transport model (GiBUU), we analyse the experimental data on $\Lambda$ and $K^0_S$ production in $\bar p A$ collisions at $p_{\rm lab}=0.2-4$ GeV/c. A satisfactory overall agreement is reached, except for the $K^0_S$ production in $\bar p+^{20}$Ne collisions at $p_{\rm lab}=608$ MeV/c, where we obtain substantially larger $K^0_S$ production rate. We also study the $\Xi$ hyperon production, important in view of the forthcoming experiments at FAIR and J-PARC.