论文标题
低能量重型离子碰撞中动力学冻结参数的层次结构
Hierarchy of kinetic freeze-out parameters in low energy heavy-ion collisions
论文作者
论文摘要
我们研究了低能重型离子碰撞中Hadron的动力学冻结参数的质量依赖性层次结构。为此，在中央PB+PB碰撞中产生的鉴定的HADRON的横向动量和速度光谱在SPS Energies中获得，范围从$ \ rm E_ {LAB} = 20A-158A $ GEV，在广义的非Boost Invariant Incriant Invar-Invar-Invar-Invar-Invar-Invar-Invar-Invar-Invar-Invar-Invar-Invar-Invar-Incriant Incriant-Incriant Incriant-Incriant Incriant-Incriant Incriant-Incriant Incriant Incriant Incriant Incriant Incrist Model中进行了分析。我们考虑单独的同时适合轻载体（$π^{ - } $，$ k^{\ pm} $）和沉重的奇怪的哈子（$λ$，$ \barλ$，$ ϕ $，$ ϕ $，$ξ^{\ pm} $，$ω^{\ pm pm} $，对于跨度的动量，以及快速的镜头。我们还以$ 158A $ GEV碰撞的速度对Charmonia（$ J/ψ$，$ψ'$）的横向动量光谱进行单独拟合。我们在拟合的动力学冻结参数中发现了明显的质量依赖性层次结构。此外，我们使用分析Landau流动解决方案研究了非统一系统的速度光谱。我们发现，介质中声速的拟合值也显示出相似的层次结构。
We study the mass dependent hierarchy of kinetic freeze-out parameters of hadrons in low energy heavy-ion collisions. For this purpose, the transverse momentum and rapidity spectra of the identified hadrons produced in central Pb+Pb collisions, available at SPS energies ranging from $\rm E_{Lab}=20A-158A $ GeV, are analyzed within a generalized non boost-invariant blast wave model. We consider separate simultaneous fits for light hadrons ($π^{-}$, $K^{\pm}$) and heavy strange hadrons ($Λ$, $\barΛ$, $ϕ$, $Ξ^{\pm}$, $Ω^{\pm}$), for which the transverse momentum spectra as well as rapidity spectra are available. We also perform a separate fit to transverse momentum spectra of charmonia ($J/Ψ$, $Ψ'$) at $158A $ GeV collisions. We find a clear mass dependent hierarchy in the fitted kinetic freeze-out parameters. Further, we study the rapidity spectra using analytical Landau flow solution for non-conformal systems. We find that the fitted value of sound velocity in the medium also shows a similar hierarchy.
