Speed of Sound and Baryon Cumulants in Heavy-Ion Collisions,Physical Review Letters

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Speed of Sound and Baryon Cumulants in Heavy-Ion Collisions
Physical Review Letters ( IF 8.1 ) Pub Date : 2021-07-23 , DOI: 10.1103/physrevlett.127.042303
Agnieszka Sorensen _{1,

2} , Dmytro Oliinychenko ₃ , Volker Koch ₂ , Larry McLerran ₃

Affiliation

We present a method that may allow an estimate of the value of the speed of sound as well as its logarithmic derivative with respect to the baryon number density in matter created in heavy-ion collisions. To this end, we use well-known observables: cumulants of the baryon number distribution. In analyses aimed at uncovering the phase diagram of strongly interacting matter, cumulants gather considerable attention as their qualitative behavior along the explored range of collision energies is expected to aid in detecting the QCD critical point. We show that the cumulants may also reveal the behavior of the speed of sound in the temperature and baryon chemical potential plane. We demonstrate the applicability of such estimates within two models of nuclear matter and explore what might be understood from known experimental data.

中文翻译：

重离子碰撞中的声速和重子累积量

我们提出了一种方法，可以估计声速的值及其相对于重离子碰撞中产生的物质中的重子数密度的对数导数。为此，我们使用众所周知的可观察量：重子数分布的累积量。在旨在揭示强相互作用物质相图的分析中，累积量引起了相当大的关注，因为它们在探索的碰撞能量范围内的定性行为有望帮助检测 QCD 临界点。我们表明，累积量还可以揭示声速在温度和重子化学势平面中的行为。我们证明了这种估计在两个核物质模型中的适用性，并探索了从已知实验数据中可以理解的内容。

更新日期：2021-07-23

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