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arXiv 2209.07073hep-phnucl-th
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54.4 GeV Au-Au碰撞中强子物质集体性质的分析

Analyses of the collective properties of hadronic matter in Au-Au collisions at 54.4 GeV

M. Waqas, G. X. Peng, M. Ajaz, A. Haj Ismail, E. A. Dawi

备注：
14 pages, 7 figures
发表信息：
Physical Review D (2022)
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摘要：

在修正的Hagedorn函数框架下研究了$p_T$ = 54.4 GeV的Au-Au碰撞中的奇异强子横动量谱.提取了动力学冻结温度$T_0$、横向流速$β_T$、动力学冻结体积$V$、平均横向动量$<p_T>$、熵参数$n$和多重性参数$N_0$。我们报告说，所有这些参数增加的中心碰撞。与周边碰撞相比，中心碰撞中较大的动力学冻结温度、横向流速、动力学冻结体积和熵参数（n）表明中心碰撞中颗粒的早期解耦。此外，所有上述参数都是质量相关的。大质量颗粒的动力学冻结温度（$T_0$）、熵参数$n$和平均横向动量（$<p_T>$）较大，而横向流速（$β_T$）、动力学冻结体积（$V$）和多重性参数（$N_0$）则相反.较大的$T_0$、$n$和较小的$β_T$以及$V$表明较重颗粒的早期冻结，而较大的$<p_T>$表明较重颗粒的径向流动效应较强。每个颗粒的单独参数组显示了多动力学冻结方案，其中质量依赖的动力学冻结体积显示了体积差异冻结方案。我们还检验了不同参数之间的相关性，包括$T_0$与$T_0$、$T_0$与$V$、$β_T$与$V$、$<p_T>$与$T_0$、$<p_T>$与$β_T$、$<p_T>$与$V$、$n$与$T_0$、$n$与$β_T$、$n$与$V$之间的相关性，并且观察到它们都彼此呈正相关，这验证了我们的结果。

英文摘要：

We investigated the strange hadrons transverse momentum ($p_T$) spectra in Au-Au collision at $\sqrt {s_{NN}}$ = 54.4 GeV in the framework of modified Hagedorn function with embedded flow. We extracted the kinetic freeze-out temperature $T_0$, transverse flow velocity $β_T$, kinetic freeze-out volume $V$, mean transverse momentum $<p_T>$, the entropy parameter $n$ and the multiplicity parameter $N_0$. We reported that all these parameters increase towards the central collisions. The larger kinetic freeze-out temperature , transverse flow velocity, kinetic freeze-out volume and the entropy parameter (n) in central collisions compared to peripheral collisions show the early decoupling of the particles in central collisions. In addition, all the above parameters are mass dependent. The kinetic freeze-out temperature ($T_0$), the entropy parameter $n$ and mean transverse momentum ($<p_T>$) are larger for massive particles, while the transverse flow velocity ($β_T$), kinetic freeze-out volume ($V$) and the multiplicity parameter ($N_0$) show the opposite behavior. Larger $T_0$, $n$ and smaller $β_T$ as well as $V$ of the heavier particles indicates the early freeze-out of the heavier particles, while larger $<p_T>$ for the heavier particles evince that the effect of radial flow is stronger in heavier particles. The separate set of parameters for each particle shows the multiple kinetic freeze-out scenario, where the mass dependent kinetic freeze-out volume shows the volume differential freeze-out scenario. We also checked the correlation among different parameters, which include the correlation of $T_0$ and $β_T$, $T_0$ and $V$, $β_T$ and $V$, $<p_T>$ and $T_0$, $<p_T>$ and $β_T$, $<p_T>$ and $V$, $n$ and $T_0$, $n$ and $β_T$, and $n$ and $V$, and they all are observed to have positive correlations with each other which validates our results.

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