论文标题

$ \ sqrt {s_ \ mathrm {nn}} = 2.4-7.7 $ gev在重合离子碰撞中的两杆碰撞中的两杆碰撞的影响

Effects of a phase transition on two-pion interferometry in heavy-ion collisions at $\sqrt{s_\mathrm{NN}}=2.4-7.7$ GeV

论文作者

Li, Pengcheng, Steinheimer, Jan, Reichert, Tom, Kittiratpattana, Apiwit, Bleicher, Marcus, Li, Qingfeng

论文摘要

汉伯里 - 布朗 - 汤威斯(HBT)相关性在$ \ sqrt {s_ \ mathrm {nn}} = 2.4-7.7〜\ text {gev} $(与固定目标框架中的固定目标框架中的固定目标框架中, $ e _ {\ rm {lab}} = 1.23〜 \ text {to} 〜30〜 \ text {gev/nucleon} $)是使用带有不同状态方程的URQMD模型计算的。在探索的HBT参数中清楚地观察到了在高重子密度下的相变的影响。发现HBT半径上的可用数据,$ r_ {o}/r_ {s} $和$ r^{2} _ {o} -r} -r^{2} _ {2} _ {s} $,在所研究的能源区域中,在较低的状态下,在较低的状态下,在较高的状态下,在较高的状态下,在较高的状态下,在较高的状态下,在较高的状态下,在较高的状态下,在软性方程中,在软性方程中,在软性方程中,在软性方程中,在软性方程中,在软性方程中,在软性方程中,在较高的范围内,在软边缘的状态下,在软边缘的状态下,在软光线中的稳定性,在软光线中均可在软边缘上进行稳定的状态。 QCD状态的高密度方程。研究了两个不同的相变场景对$ r_ {o}/r_ {s} $和$ r^{2} _ {o} -r^{2} _ {s} $的具体效果。发现可以使用HBT数据排除具有低于4倍核饱和密度的状态方程的显着软化状态方程的相变。我们的结果强调,pion的$ r_ {o}/r_ {s} $和$ r^{2} _ {o} -r^{2} _ {2} _ {s} $对状态方程的刚度敏感,并且可以用来限制和理解高baryon dsity dsity Denterion Dentiald Menty Dentery Dentiald Menterion Dentiald Mentery Dentiald Mentery Dentiald Menterion Dential dsative。

Hanbury-Brown-Twiss (HBT) correlations for charged pions in central Au+Au collisions at $\sqrt{s_\mathrm{NN}}=2.4 - 7.7~\text{GeV}$ (corresponding to beam kinetic energies in the fixed target frame from $E_{\rm{lab}}=1.23~\text{to}~30~\text{GeV/nucleon}$) are calculated using the UrQMD model with different equations of state. The effects of a phase transition at high baryon densities are clearly observed in the HBT parameters that are explored. It is found that the available data on the HBT radii, $R_{O}/R_{S}$ and $R^{2}_{O}-R^{2}_{S}$, in the investigated energy region favors a relatively stiff equation of state at low beam energies which then turns into a soft equation of state at high collision energies consistent with astrophysical constraints on the high density equation of state of QCD. The specific effects of two different phase transition scenarios on the $R_{O}/R_{S}$ and $R^{2}_{O}-R^{2}_{S}$ are investigated. It is found that a phase transition with a significant softening of the equation of state below 4 times nuclear saturation density can be excluded using HBT data. Our results highlight that the pion's $R_{O}/R_{S}$ and $R^{2}_{O}-R^{2}_{S}$ are sensitive to the stiffness of the equation of state, and can be used to constrain and understand the QCD equation of state in the high baryon density region.

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