arXiv 1608.040682016-08nucl-th

通过将横向质谱和HBT半径拟合在一起来提取温度和横向流

Extracting temperature and transverse flow by fitting transverse mass spectra and HBT radii together

Ronghua He, Jing Qian, Jianyi Chen, Qingxin Wu, Lei Huo

备注：: 14 pages, 5 figures
发表信息：: Modern Physics Letters A, Vol. 32, No. 9 (2017) 1750052
DOI：: 10.1142/S0217732317500523

摘要：

在局域热平衡和横向膨胀的假设下，用冲击波参数化方法分析了全同π介子和全同K介子的单粒子横向质量谱和HBT半径。在此假设下，温度参数$T$和横向膨胀快度$ρ$对横向质量$m_\text T$谱和HBT半径$R_\text{s}(K_\text T)$的形状敏感。通过对$m_\text{T}$谱和HBT半径$R_\text s (K_\text T)$的拟合，分别观察到$T$和$ρ$之间的负相关和正相关。对于使用冲击波函数的蒙特卡罗模拟，通过利用组合优化函数$χ^2$将$m_T$光谱和HBT半径拟合在一起来提取$T$和$ρ$。利用该方法可以提取蒙特卡罗源的$T$和$ρ$。将该方法应用于RHIC能区的多相输运模型（AMPT），观测到π介子和K介子的$T$和$ρ$有明显的差异，且$T$和$ρ$随碰撞能$\sqrt{s_\text{NN}}$的变化趋势与直接从AMPT模型中提取的结果相似。

英文摘要：

Single particle transverse mass spectra and HBT radii of identical pion and identical kaon are analyzed with a blast-wave parametrization under the assumptions local thermal equilibrium and transverse expansion. Under the assumptions, temperature parameter $T$ and transverse expansion rapidity $ρ$ are sensitive to the shapes of transverse mass $m_\text T$ spectrum and HBT radius $R_\text{s}(K_\text T)$. Negative and positive correlations between $T$ and $ρ$ are observed by fitting $m_\text{T}$ spectrum and HBT radius $R_\text s (K_\text T)$, respectively. For a Monte Carlo simulation using the blast-wave function, $T$ and $ρ$ are extracted by fitting $m_T$ spectra and HBT radii together utilizing a combined optimization function $χ^2$. With this method, $T$ and $ρ$ of the Monte Carlo sources can be extracted. Using this method for A Multi-Phase Transport model (AMPT) at RHIC energy, the differences of $T$ and $ρ$ between pion and kaon are observed obviously, and the tendencies of $T$ and $ρ$ vs collision energy $\sqrt{s_\text{NN}}$ are similar with the results extracted directly from the AMPT model.

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