论文标题
tsallis参数的中心性，横向动量和碰撞能量依赖性在相对论重型离子碰撞中
Centrality, transverse momentum and collision energy dependence of the Tsallis parameters in relativistic heavy-ion collisions
论文作者
论文摘要
在高能重型离子碰撞中产生的物质的热力学特性已经在非扩展的Tsallis统计框架中进行了研究。 The transverse momentum ($p_{\rm T}$)~spectra of identified charged particles (pions, kaons, protons) and all charged particles from the available experimental data of Au-Au collisions at the Relativistic Heavy Ion Collider (RHIC) energies and Pb-Pb collisions at the Large Hadron Collider (LHC) energies are fitted by the Tsallis distribution.拟合参数，$ q $和$ t $分别衡量偏离平衡状态和热级系统的有效温度的偏差程度。 $ p _ {\ rm t} $〜光谱通过tsallis分布功能从外围到中央碰撞的tsallis分布函数很好地描述了各种碰撞能量，从$ \ sqrt {s _ {\ rm nn}} $ = 7.7 GEV到5.02 tev。发现提取的tsallis参数取决于$ p _ {\ rm t} $中的粒子物种，碰撞能量，中心性和拟合范围。对于中央碰撞，$ q $和$ t $都在很大程度上取决于$ p _ {\ rm t} $中的拟合范围。对于大多数碰撞能量，$ Q $随着中心性的作用几乎保持恒定，而$ t $从外围碰撞到中央碰撞。对于给定的中心性，$ Q $系统地增加了碰撞能量的函数，而$ t $的趋势下降。相对于碰撞能量和中心性，$ q $和$ t $的概况图显示了两个参数之间的反相关。
The thermodynamic properties of matter created in high-energy heavy-ion collisions have been studied in the framework of the non-extensive Tsallis statistics. The transverse momentum ($p_{\rm T}$)~spectra of identified charged particles (pions, kaons, protons) and all charged particles from the available experimental data of Au-Au collisions at the Relativistic Heavy Ion Collider (RHIC) energies and Pb-Pb collisions at the Large Hadron Collider (LHC) energies are fitted by the Tsallis distribution. The fit parameters, $q$ and $T$ measure the degree of deviation from an equilibrium state and the effective temperature of the thermalized system, respectively. The $p_{\rm T}$~spectra are well described by the Tsallis distribution function from peripheral to central collisions for the wide range of collision energies, from $\sqrt{s_{\rm NN}}$ = 7.7 GeV to 5.02 TeV. The extracted Tsallis parameters are found to be dependent on the particle species, collision energy, centrality, and fitting ranges in $p_{\rm T}$. For central collisions, both $q$ and $T$ depend strongly on the fit ranges in $p_{\rm T}$. For most of the collision energies, $q$ remains almost constant as a function of centrality, whereas $T$ increases from peripheral to central collisions. For a given centrality, $q$ systematically increases as a function of collision energy whereas $T$ has a decreasing trend. A profile plot of $q$ and $T$ with respect to collision energy and centrality shows an anti-correlation between the two parameters.
