Constituent Quark Scaling of Strangeness Enhancement in Heavy-Ion Collisions
Constituent Quark Scaling of Strangeness Enhancement in Heavy-Ion Collisions
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DOI：
10.1155/2013/273248
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发表时间：
2012-06
影响因子：
1.7
通讯作者：
N. Behera;R. Sahoo;B. Nandi
中科院分区：
文献类型：
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作者：
N. Behera;R. Sahoo;B. Nandi
在核重叠模型的框架下，我们估计了质子-质子、质子-核和核-核碰撞中核子和夸克的数目。我们观察到多奇异粒子的核子-（-）归一化增强数，它表现出随中心性单调增加，并且当归一化到参与碰撞的组分夸克数时，它是一种与中心无关的标度行为（）。此外，我们观察到，归一化的增强，当进一步规范化的奇异性内容，显示了一个奇异性无关的标度行为。这在顶级RHIC能量中保持良好。然而，相应的SPS数据显示出弱标度。此外，奇异标度似乎违反顶部SPS能量。RHIC的这种标度表明，部分子自由度在多奇异粒子的产生中起着重要的作用。根据上述观测结果，顶部SPS能量显示强子和部分子相共存。因此，我们将数据与HIJING、AMPT和UrQMD模型进行比较，以了解不同能量下的粒子产生动态。
In the framework of a nuclear overlap model, we estimate the number of nucleons and quark participants in proton-proton, proton-nucleus, and nucleus-nucleus collisions. We observe the number of nucleon- (-) normalized enhancement of multistrange particles, which shows a monotonic increase with centrality and turns out to be a centrality-independent scaling behavior when normalized to number of constituent quarks participating in the collision (). In addition, we observe that the -normalized enhancement, when further normalized to the strangeness content, shows a strangeness-independent scaling behavior. This holds good at top RHIC energy. However, the corresponding SPS data show a weak -scaling. Moreover, the strangeness scaling seems to be violated at top SPS energy. This scaling at RHIC indicates that the partonic degrees of freedom play an important role in the production of multistrange particles. Top SPS energy, in view of the above observations, shows a coexistence of hadronic and partonic phases. Therefore we give a comparison of data with HIJING, AMPT, and UrQMD models to understand the particle production dynamics at different energies.