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arXiv 1708.08152nucl-thhep-lathep-phnucl-ex
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强子谱引起的冻结系统学

Freezeout systematics due to the hadron spectrum

Sandeep Chatterjee, Debadeepti Mishra, Bedangadas Mohanty, Subhasis Samanta

摘要:

我们利用强子谱研究了重离子碰撞中冻结面的系统学。怀疑的共振状态,尚未被实验证实,在确定的冻结表面的作用进行了研究。我们研究了两种不同的冻结方案--统一冻结方案,其中所有强子都假定冻结在相同的热态上;和味依赖的顺序冻结方案,其中不同的冻结热态分别适用于含价奇异夸克和不含价奇异夸克的强子。分析了平均强子产额和净质子及净电荷分布的标度方差。我们发现冻结温度$T$下降了$\sim5\%$,而无量纲冻结参数$μ_B/T$和$VT^3$($μ_B$和$V$分别是重子化学势和冻结时的体积)对输入强子谱的系统性不敏感.在$T$和$VT^3$中观察到的味道层次的暗示,只有确认的共振幸存的强子谱的系统学。这是更突出的$\sqrt{s_{NN}}\sim10 - 100$ GeV之间的最大层次的$T\sim10\%$和$VT^3\sim40\%$。然而,由于强子谱的系统学及其衰变性质,热参数的不确定性使我们无法对味层次结构进行定量估计。

英文摘要:

We investigate systematics of the freezeout surface in heavy ion collisions due to the hadron spectrum. The role of suspected resonance states that are yet to be confirmed experimentally in identifying the freezeout surface has been investigated. We have studied two different freezeout schemes - unified freezeout scheme where all hadrons are assumed to freezeout at the same thermal state and a flavor dependent sequential freezeout scheme with different freezeout thermal states for hadrons with or without valence strange quarks. The data of mean hadron yields as well as scaled variance of net proton and net charge distributions have been analysed. We find the freezeout temperature $T$ to drop by $\sim5\%$ while the dimensionless freezeout parameters $μ_B/T$ and $VT^3$ ($μ_B$ and $V$ are the baryon chemical potential and the volume at freezeout respectively) are insensitive to the systematics of the input hadron spectrum. The observed hint of flavor hierarchy in $T$ and $VT^3$ with only confirmed resonances survives the systematics of the hadron spectrum. It is more prominent between $\sqrt{s_{NN}}\sim10 - 100$ GeV where the maximum hierarchy in $T\sim10\%$ and $VT^3\sim40\%$. However, the uncertainties in the thermal parameters due to the systematics of the hadron spectrum and their decay properties do not allow us to make a quantitative estimate of the flavor hierarchy yet.

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