奇异数在重子和电荷阻止中的作用
The role of strangeness in baryon and electric charge stoppings
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中文总结 AI 辅助
本研究通过分析B/Q×Z/A和B/ΔQ×ΔZ/A比值对s-s̄不对称性的敏感性，揭示AMPT模型与STAR数据在重子阻止上的矛盾，为理解重子阻止机制提供新线索。
中文摘要 AI 辅助
最近有研究提出，比较净重子（$B$）阻止与净电荷（$Q$）阻止有助于研究核碰撞中的重子阻止机制。我们发现$B/Q\times Z/A$比值对$s$和$\bar s$夸克快度分布的差异非常敏感。在200A GeV能量下同量异位素碰撞的中央快度区域，多相输运（AMPT）模型给出的$\bar s$略多于$s$，导致$B/Q\times Z/A<1$，而不含$s-\bar s$不对称性的模型则给出$B/Q\times Z/A \geq 1$。比较Ru+Ru和Zr+Zr同量异位素碰撞，AMPT（和UrQMD）模型在所有中心度下的中央快度区域给出$B/\Delta Q\times \Delta Z/A<1$，这与最近的STAR数据强烈矛盾。我们还发现$B/\Delta Q\times \Delta Z/A$比值对净轻夸克（$u,d$）阻止非常敏感，但对$s-\bar s$不对称性的敏感度比$B/Q\times Z/A$比值低3倍。这些结果预计将有助于我们解决阻止之谜，并在未来更好地理解重子阻止机制。
英文摘要
Recently it has been proposed that comparing the net-baryon ($B$) stopping with net-electric charge ($Q$) stopping can help studies of the baryon stopping mechanism in nuclear collisions. Here we find the $B/Q\times Z/A$ ratio to be very sensitive to the difference between $s$ and $\bar s$ quark rapidity distributions. For mid-rapidity of isobar collisions at 200A GeV, a multi-phase transport (AMPT) model gives slightly more $\bar s$ than $s$, which leads to $B/Q\times Z/A<1$, while the model without the $s-\bar s$ asymmetry gives $B/Q\times Z/A \geq 1$. Comparing Ru+Ru and Zr+Zr isobar collisions, the AMPT (and UrQMD) model gives $B/ΔQ\times ΔZ/A<1$ at mid-rapidity at all centralities, which strongly contradicts the recent STAR data. We also find that the $B/ΔQ\times ΔZ/A$ ratio is very sensitive to the net-light quark ($u,d$) stoppings, but it is less sensitive to the $s-\bar s$ asymmetry than the $B/Q\times Z/A$ ratio by a factor of 3. These results are expected to help us resolve the stopping puzzle and better understand the baryon stopping mechanism in the future.
发表机构
- East Carolina University（东卡罗来纳大学）
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