Baryon stopping and strange baryon and antibaryon production at ultrarelativistic energies
Baryon stopping and strange baryon and antibaryon production at ultrarelativistic energies
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DOI：
10.1103/physrevc.66.054903
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发表时间：
2002-05
影响因子：
3.1
通讯作者：
H. Weber;E. Bratkovskaya;H. Stöcker
中科院分区：
文献类型：
--
作者：
H. Weber;E. Bratkovskaya;H. Stöcker
利用UrQMD模型计算了20 - 160 AGeV中心Pb+Pb碰撞中质子的停止量以及超子和反超子的快度分布，并与NA 49合作组最近获得的40、80和160 AGeV的实验数据进行了比较.此外，与NA 49数据相比，研究了Pb+Pb碰撞中160 AGeV的重子停止量随中心性的变化。我们发现，中心碰撞的奇异重子产额得到了合理的描述，但快度分布比数据窄一些。此外，在40，80，和160 A GeV的实验反超子快度分布被低估的因素高达3\char22 {}取决于湮灭截面采用的\char 22 {}这可能是解决失踪的多光子融合通道UrQMD模型。
The amount of proton stopping in central Pb+Pb collisions from 20\char21{}160 A GeV as well as hyperon and antihyperon rapidity distributions are calculated within the UrQMD model in comparison to experimental data at 40, 80, and 160 A GeV taken recently from the NA49 collaboration. Furthermore, the amount of baryon stopping at 160A GeV for Pb+Pb collisions is studied as a function of centrality in comparison to the NA49 data. We find that the strange baryon yield is reasonably described for central collisions, however, the rapidity distributions are somewhat more narrow than the data. Moreover, the experimental antihyperon rapidity distributions at 40, 80, and 160 A GeV are underestimated by up to factors of 3\char22{}depending on the annihilation cross section employed\char22{}which might be addressed to missing multimeson fusion channels in the UrQMD model.