Li Li-Li, Haj Ismail Abd Al Karim
Department of Basic Sciences, Shanxi Agriculture University, Jinzhong 030801, China.
College of Humanities and Sciences, Ajman University, Ajman P.O. Box 346, United Arab Emirates.
Entropy (Basel). 2022 Nov 24;24(12):1720. doi: 10.3390/e24121720.
We analyzed the transverse momentum pT spectra of various strange hadrons KS0, Λ(Λ¯) and Ξ-(Ξ¯+) at mid-rapidity () in different centrality intervals from Au+Au collisions at sNN= 54.4 GeV. The pT spectra of these strange hadrons are investigated by the Tsallis-like distribution, which satisfactorily fits the experimental data. The bulk properties of the medium produced in ultra-relativistic heavy-ion collisions at the kinetic freeze-out are reflected by measuring the hadron spectra. The effective temperature , transverse flow velocity βT, and mean pT along with other parameters that are strongly dependent on centrality and particle specie are extracted. The effective temperature of multi-strange particle (Ξ-(Ξ¯+)) is larger as compared to singly-strange particles Λ(Λ¯) and KS0. Furthermore, the kinetic freeze-out temperature , transverse flow velocity βT. and mean pT (⟨pT⟩) show a decreasing trend towards lower centrality, while the entropy parameter increases from central to peripheral collisions. In addition, a positive correlation of ⟨pT⟩ and and a negative correlation of and are also reported.
我们分析了在质心系能量(s_{NN}=54.4) GeV的金金碰撞中，不同中心度区间下，各种奇异强子(K^0_S)、(\Lambda(\bar{\Lambda}))和(\Xi^-(\bar{\Xi}^+))在中快度（）处的横向动量(p_T)谱。这些奇异强子的(p_T)谱通过类Tsallis分布进行研究，该分布能很好地拟合实验数据。通过测量强子谱来反映在相对论重离子碰撞中动力学冻结时产生的介质的整体性质。提取了有效温度、横向流速(\beta_T)、平均(p_T)以及其他强烈依赖于中心度和粒子种类的参数。与单奇异粒子(\Lambda(\bar{\Lambda}))和(K^0_S)相比，多奇异粒子（(\Xi^-(\bar{\Xi}^+))）的有效温度更高。此外，动力学冻结温度、横向流速(\beta_T)和平均(p_T)（(\langle p_T\rangle)）呈现出向更低中心度降低的趋势，而熵参数从中心碰撞到周边碰撞增加。此外，还报道了(\langle p_T\rangle)与的正相关以及与的负相关。
