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arXiv 0908.2522nucl-th
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能量为62.4 - 200 RHIC重离子碰撞中P-奇关联函数的估算

Estimation of P-odd correlators in heavy ion collisions at RHIC energies 62.4 -- 200 GeV

V. A. Okorokov

摘要:

在局域$\mathcal{TIP}$假设的框架下,宇称破坏效应的强度可以用相关值来表征。本文讨论了RHIC能域62.4 - 200 GeV重离子碰撞中同电荷和异电荷关联函数的能量和中心度依赖关系。磁场在初始能量降低的情况下,在中等和大的时间内显示出显著的增加。两种可能的情况下的初始时间进行了详细研究。这两种情况下预测的初始时间在${Au+Au}$碰撞在62.4 GeV的最接近的值。初始时间值之间的差异得到两种不同的情况下增加的能量增加和较轻的${Cu}$ -核的碰撞。在62.4和200 GeV的${Au+Au}$碰撞手征磁效应的分析框架下,计算了与可能的局部$\mathcal{TIP}$破坏有关的关联函数的边界值.结果显示为函数的碰撞中心。初步的实验STAR数据进行了比较手征磁效应模型的预测直接。实验信号与模型预期一致的${Au+Au}$碰撞在62.4 GeV在所有中心的相同和相反的电荷相关性。在更高的能量200 GeV的手征磁效应的模型低估了相同的电荷相关值的中心和midcentral事件,但相同的电荷相关的外围事件,以及相反的电荷相关的模型计算预测的边界。

英文摘要:

The strength of parity violation effect can be characterized by correlator value in the framework of local $\mathcal{TIP}$ hypothesis. The energy and centrality dependencies of correlators for same and opposite charges are discussed for heavy ion collisions in RHIC energy domain 62.4 -- 200 GeV. The magnetic field shows a significant increasing at initial energy decreasing for intermediate and large times. Two possible scenarios for initial time are investigated in detail. Both scenarios predict the most close values for initial time in ${Au+Au}$ collisions at 62.4 GeV. Disagreement between initial time values obtained for two various scenarios increases with energy increasing and for collisions of lighter ${Cu}$-nucleus. Boundary values for correlators related with possible local $\mathcal{TIP}$ violation are calculated in the framework of analytic approach of chiral magnetic effect for ${Au+Au}$ collisions at 62.4 and 200 GeV. The results are shown as function of collision centrality. Preliminary experimental STAR data are compared with predictions of chiral magnetic effect model directly. Experimental signals consistent with model expectations for both same and opposite charge correlations in ${Au+Au}$ collisions at 62.4 GeV at all centralities. At higher energy 200 GeV the model of chiral magnetic effect underestimates same charge correlator values for central and midcentral events but the same charge correlations for peripheral events as well as opposite charge correlations are in the boundaries predicted by model calculations.

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