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首页> 外文期刊>Physical review, C >Examination of directed flow as a signature of the softest point of the equation of state in QCD matter
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Examination of directed flow as a signature of the softest point of the equation of state in QCD matter

机译：检查QCD物质方程式最柔软点的定向流量

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摘要

We analyze the directed flow of protons and pions in high-energy heavy-ion collisions in the incident energy range from root s(NN) = 7.7 to 27 GeV within amicroscopic transport model. Standard hadronic transport approaches do not describe the collapse of directed flow below root s(NN) similar or equal to 20 GeV. By contrast, a model that simulates effects of a softening of the equation of state descibes well the behavior of directed flow data recently obtained by the STAR Collaboration [Phys. Rev. Lett. 112, 162301 (2014)]. We give a detailed analysis of how directed flow is generated. Particularly, we found that softening of the effective equation of state at the overlapping region of two nuclei, i.e., the reaction stages where the system reaches high baryon density state, is needed to explain the observed collapse of proton directed flow within a hadronic transport approach.
机译：我们分析了从根S（nn）= 7.7至27 gev的入射能量范围内的高能量重离子碰撞中的质子和π在amicroscopic传输模型中的入射能量范围内的定向流。 标准的屈光度传输方法没有描述类似于或等于20 GEV的根S（NN）下方的定向流的崩溃。 相比之下，模拟状态的柔化效果的模型，该模型可以很好地解析了星星协作最近获得的定向流数据的行为[物理。 rev. lett。 112,162301（2014）]。 我们详细分析了如何生成定向流程。 特别地，我们发现，需要在两个核的重叠区域处软化状态的有效方程，即系统达到高焦孔密度状态的反应阶段，以说明在辐射传输方法内观察到的质子定向流的塌陷 。

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