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Searching for the QCD critical point in AA collisions at CERN SPS

机译:在CERN SPS的AA碰撞中搜索QCD临界点

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摘要

We investigate the transverse momentum correlations of pairs of opposite charged pions near their production threshold. Through intermittency analysis, we search for power-law dependence on observation scale, as dictated by critical QCD. We analyze the data on the most central collisions in four A systems (A = p, C, Si, Pb) at maximum SPS energy. We find a significant effect for the SiSi system approaching in size the critical QCD predictions as measured by the intermittency index φ{symbol} _2. Absence of this effect in the (π -, π -) sector of the SiSi system gives further support that the observed behavior in the isoscalar mode is of critical origin.
机译:我们研究了成对的带电对子在其生产阈值附近的横向动量相关性。通过间歇性分析,我们根据关键QCD的要求来搜索幂律对观测范围的依赖。我们分析了在最大SPS能量下四个A系统(A = p,C,Si,Pb)中最中心碰撞的数据。我们发现,对于SiSi系统,其大小接近临界QCD预测(通过间断指数φ{symbol} _2进行测量)具有显着影响。 SiSi系统的(π-,π-)扇区中没有这种效应,这进一步证明了在等标量模式下观察到的行为至关重要。

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