RHIC能区强子压缩关联的最新进展
Update on the status of Hadronic Squeezed Correlations at RHIC Energies
摘要：
在高能重离子碰撞中，形成了一种热而稠密的介质，在这种介质中，强子质量可能偏离它们的渐近值。如果发生这种质量修改，粒子-反粒子对的压缩背靠背关联（BBC）预计将出现，无论是在费米（fBBC）和玻色子（bBBC）部门。虽然它们的强度是无限的，即使对于有限尺寸的膨胀系统，这些强子压缩关联是非常敏感的时间发射分布。在这里，我们讨论的情况下，这个时间发射是参数化的列维型分布的结果，表明它减少了信号甚至更显着比洛伦兹分布，这已经降低了数量级的影响的强度，相比突然发射。然而，我们表明，信号仍然可以生存，如果该过程的持续时间很短，如果效果是寻找较轻的介子，如K介子。我们将我们的一些结果与最近PHENIX关于K^+K^-对压缩关联的初步数据进行了比较。
英文摘要：
In high energy heavy ion collisions a hot and dense medium is formed, where the hadronic masses may be shifted from their asymptotic values. If this mass modification occurs, squeezed back-to-back correlations (BBC) of particle-antiparticle pairs are predicted to appear, both in the femionic (fBBC) and in the bosonic (bBBC) sectors. Although they have unlimited intensity even for finite-size expanding systems, these hadronic squeezed correlations are very sensitive to their time emission distribution. Here we discuss results in case this time emission is parameterized by a Levy-type distribution, showing that it reduces the signal even more dramatically than a Lorentzian distribution, which already reduces the intensity of the effect by orders of magnitude, as compared to the sudden emission. However, we show that the signal could still survive if the duration of the process is short, and if the effect is searched for lighter mesons, such as kaons. We compare some of our results to recent PHENIX preliminary data on squeezed correlations of K^+K^- pairs.
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