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arXiv 0905.2494hep-ph
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J/Psi抑制、逾渗模型和SPS和RHIC能量下AA碰撞的临界能量密度

J/Psi suppression, percolation model and the critical energy density in AA collisions at SPS and RHIC energies with the account of centrality

G. Feofilov, O. Kochebina

摘要:

在弦逾渗模型的框架下,考虑了在SPS中PbPb碰撞中所谓的异常J/psi抑制的实验数据。这种发作是观察到在一定的碰撞中心,其特征在于核子参与者的数量(Npart)有关的影响参数。本文用修正的Bjorken公式计算了不同碰撞参数下AA碰撞的局域能量密度,并详细介绍了中快度带电粒子密度的最新数据。最后,我们比较了平均局部能量和弦密度的变化,并将临界渗流现象的发生与临界能量密度值相匹配,认为它们在相同的N部分值下。对最近的RHIC数据进行了类似的分析,并对结果进行了讨论。

英文摘要:

Experimental data on the onset of a so-called anomalous J/psi suppression in PbPb collisions at the SPS are considered in the framework of string percolation model. This onset is observed at a certain collision centrality, characterized by the number of nucleons-participants (Npart) related to the impact-parameter. Modified Bjorken formula calculations are performed for the local energy densities in AA collisions at different impact-parameters and with detailed account of the latest data available on the charged particles densities at midrapidity. Finally we compare variations of mean local energy and of string densities and match the occurrence of the critical percolation phenomenon with the critical energy density value, considering them at the same values of Npart. Similar analysis was performed for recent RHIC data and the results are discussed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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