Deep sub-threshold Xi and Lambda production in nuclear collisions with the UrQMD transport model

作者：Graef G^*; Steinheimer J; Li F; Bleicher M

来源：Physical Review C, 2014, 90(6): 064909.

DOI：10.1103/PhysRevC.90.064909

We present results on deep sub-threshold hyperon production in nuclear collisions, with the UrQMD transport model. Introducing anti-kaon+baryon and hyperon + hyperon strangeness exchange reactions we obtain a good description of experimental data on single strange hadron production in Ar+KCl reactions at E-lab = 1.76A GeV. We find that the hyperon strangeness exchange is the dominant process contributing to the Xi(-) yield; however, our study remains short of explaining the Xi(-)/Lambda ratio measured with the HADES experiment. We also discuss possible reasons for the discrepancy with previous studies and the experimental results, finding that many details of the transport simulation may have significant effects on the final Xi(-) yield.

• 出版日期2014-12-18