论文标题
在LHC Energies中探索$ pp $和$ a-a $碰撞的QGP阶段
Exploring the QGP phase above the deconfinement temperature in $pp$ and $A-A$ collisions at LHC energies
论文作者
论文摘要
在目前的工作中，我们分析了在LHC Energies $ \ sqrt s = $ 5.02和13 TEV由Alice Collocoration使用Color Cline -String Percolation Model（CSPM）发布的LHC Energies $ \ sqrt $ \ sqrt $ \ sqrt $ \ sqrt s = $ 5.02和13 TEV的碰撞的带电粒子的横向动量光谱。对于$ \ sqrt {s_ {nn}} = $ 2.76和5.02 tev的重离子Pb-pb以及xe-xe at $ \ sqrt {s_ {nn}} = $ 5.44 TEV。初始温度在$ {\ it pp} $碰撞中以低和高多样性事件提取。对于$ a-a $碰撞，温度是作为中心性的作用而获得的。 从$ pp $和$ a-a $碰撞的温度缩放时，将在横向相互作用区域缩放时获得。我们对PB-PB和XE-XE碰撞的结果表明，$ \ bm \ bm \ varepsilon/t^{4} $上方t $ \ sim $ 210 meV，并达到$ \ bm \ bm \ bm \ varepsilon/t^{4} \ sim $ 16处于温度$ 230的理想气体和gluons的理想气体和gluons的价值。如果$ pp $碰撞，只有$ \ bm \ varepsilon/t^{4} \ sim $ 10对应于$ \ sim $ 30的自由度。
In the present work we have analyzed the transverse momentum spectra of charged particles in high multiplicity ${\it pp}$ collisions at LHC energies $\sqrt s = $ 5.02 and 13 TeV published by the ALICE Collaboration using the Color String Percolation Model (CSPM). For heavy ions Pb-Pb at $\sqrt {s_{NN}} =$ 2.76 and 5.02 TeV along with Xe-Xe at $\sqrt {s_{NN}} = $ 5.44 TeV have been analyzed. The initial temperature is extracted both in low and high multiplicity events in ${\it pp}$ collisions. For $A-A$ collisions the temperature is obtained as a function of centrality. A universal scaling in the temperature from $pp$ and $A-A$ collisions is obtained when multiplicity is scaled by the transverse interaction area.From the measured energy density $\bm \varepsilon$ and the temperature the dimensionless quantity $\bm \varepsilon/T^{4}$ is obtained. Our results for Pb-Pb and Xe-Xe collisions show a sharp increase in $\bm \varepsilon/T^{4}$ above T $\sim$ 210 MeV and reaching the ideal gas of quarks and gluons value of $\bm \varepsilon/T^{4} \sim$ 16 at temperature $\sim $ 230 MeV. In case of $pp$ collisions only $\bm \varepsilon/T^{4} \sim $ 10 corresponding to $\sim$ 30 degrees of freedom.
