Speaker
Description
Hadronic transport models are central approaches to study strangeness production from hadron interactions at low-beam energies.
At these energies, results from ArKCl and pNb collisions sparked interest in the last years, since much higher yields of double-strange hadrons were observed than theoretically expected. Therefore, in this work, a previously suggested mechanism to produce $\phi$ and $\Xi$ hadrons via rare decays of high mass $N^*$ resonances is explored with the transport approach SMASH[^1]. This mechanism is able to reproduce the available experimental data for $\phi$ and $\Xi$ with only one free parameter. Predictions for upcoming data for AgAg reactions at $E_{\rm Kin}=1.58A$ GeV from HADES will allow to further constrain this approach. The predicted particle yields include complementary strangeness production of the more abundant $K$ and $\Lambda + \Sigma^0$.
The high densities at these lower beam energies allow for multi-particle interaction as another class of reactions, also relevant for the production of (multi-)strange hadrons. Multi-particle reactions have been recently successfully introduced for the employed transport approach SMASH[^2]. In this work, the relevance of different multi-particle reactions in nucleus-nucleus collisions is explored. They are found to significantly impact particle abundances. In particular, the relevance of $B\bar{B}$ regeneration reactions is a controversy discussed topic ("proton anomaly"). It is demonstrated that, when including the $5\pi\rightarrow p\bar{p}$ regeneration reaction in the transport calculation, half of the (anti-)proton yield that is lost due to annihilations is recovered at mid-rapidity[^3]. By showing such sizable contributions, the findings motivate further exploration of multi-particle interaction in the strangeness sector.
[^1]: JS, , N. Kübler & H. Elfner, Phys. Rev. C 103, 044904 (2021)
[^2]: JS, D. Oliinychenko, J. M. Torres-Rincon & H. Elfner, Phys. Rev. C 104, 034908 (2021)
[^3]: O. Garcia-Montero, JS, A. Schäfer, J. M. Torres-Rincon & H. Elfner, arXiv:2107.08812
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