论文标题
在RHIC束能量扫描中用正向检测器确定中心性测定
Centrality determination with a forward detector in the RHIC Beam Energy Scan
论文作者
论文摘要
最近，Chatterjee等人使用了HADRONIC转运模型来估计各种实验量选择与相对论重离子碰撞器（RHIC）相关的相关性重离子碰撞的影响参数的分辨率。发现基于正向快速时粒子多样性的措施比基于中等差异的措施明显差。使用相同的模型，我们表明，基于正向快速颗粒的分辨率稍微更复杂，可以极大地改善分辨率。即使模型通过对恒星实验的最新升级检测器进行现实模拟，这种改进仍然存在。这些结果强调了基于在正向快速性下检测到的粒子进行优化中心度度量的重要性，尤其是对于在QCD相图中寻找临界点的实验研究。这样的测量通常集中在中期质子多样性上，因此基于中等差异的多样性选择事件会增加非平凡自相关的可能性。
Recently, Chatterjee et al used a hadronic transport model to estimate the resolution with which various experimental quantities select the impact parameter of relativistic heavy ion collisions at collision energies relevant to the Beam Energy Scan (BES) program at the Relativistic Heavy Ion Collider (RHIC). Measures based on particle multiplicity at forward rapidity were found to be significantly worse than those based on midrapidity multiplicity. Using the same model, we show that a slightly more sophisticated measure greatly improves the resolution based on forward rapidity particles; this improvement persists even when the model is filtered through a realistic simulation of a recent upgrade detector to the STAR experiment. These results highlight the importance of optimizing centrality measures based on particles detected at forward rapidity, especially for experimental studies that search for a critical point in the QCD phase diagram. Such measurements usually focus on proton multiplicity fluctuations at midrapidity, hence selecting events based on multiplicity at midrapidity raises the possibility of nontrivial autocorrelations.
