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arXiv 2008.00686nucl-exhep-ph
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高能重离子碰撞中带电粒子和$π^0$的抑制

Considerations on the suppression of charged particles and $π^0$ in high energy heavy ion collisions

M. Petrovici, A. Lindner, A. Pop

备注：
ICHEP 2020
发表信息：
Phys. Rev. C 103, 034903 (2021)
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摘要：

本文根据通常的核修正因子$R_{AA} $和$R_{CP}$，对在布鲁克海文相对论重离子对撞机（RHIC）上获得的Au-Au（Cu-Cu）碰撞和在CERN大型强子对撞机（LHC）上获得的Pb-Pb（Xe-Pb）碰撞的带电粒子和$π^{0}$抑制的实验结果进行了汇编。以及新引入的$R^{N}_{AA}$和$R^{N}_{CP}$作为$\langle N_{part} \rangle$和$\langle dN_{ch}/dη\rangle$的函数。这些研究集中在实验中证明的最大抑制区域中的PDMATHAMT范围。$R_{AA}$的核心贡献。本文讨论了7 TeV pp碰撞中高带电粒子多重数事件的丢失抑制。在RHIC的Au-Au碰撞和在LHC的Pb-Pb碰撞中测量的带电粒子的$R_{CP}$和$R^N_{CP}$以及$R_{AA}^{π^0}$和$(R_{AA}^N)^{π^0}$作为$\sqrt{s_{NN}}$的函数的趋势显示出从$\sqrt{s_{NN}}$ = 39 GeV到$\sqrt{s_{NN}}$ =200 GeV的抑制变大，随后在Pb-Pb碰撞中饱和到最高能量$\sqrt{s_{NN}}$ =5.02 TeV。在$\sqrt{s_{NN}}$ =62.4 - 130 GeV的区域中，作为碰撞能量的函数，最中心碰撞的$(1-R_{AA}^{π^0})/\langle dN/dy \rangle$的依赖性发生了明显变化。

英文摘要：

Experimental results related to charged particle and $π^{0}$ suppression obtained at the Relativistic Heavy Ion Collider (RHIC) at Brookhaven for Au-Au (Cu-Cu) collisions and at the Large Hadron Collider (LHC) at CERN for Pb-Pb (Xe-Xe) collisions are compiled in terms of the usual nuclear modification factors, $R_{AA} $ and $R_{CP}$, and of the newly introduced $R^{N}_{AA}$ and $R^{N}_{CP}$ as a function of $\langle N_{part} \rangle$ and $\langle dN_{ch}/dη\rangle$. The studies are focused on a $p_T$ range in the region of maximum suppression evidenced in the experiments. The core contribution to $R_{AA}$ is presented. Considerations on the missing suppression in high charged particle multiplicity events for pp collisions at 7 TeV are presented. The trends of $R_{CP}$ and $R^N_{CP}$ for charged particles and $R_{AA}^{π^0}$ and $(R_{AA}^N)^{π^0}$ as a function of $\sqrt{s_{NN}}$, measured at RHIC in Au-Au collisions and at LHC in Pb-Pb collisions, show a suppression that becomes larger from $\sqrt{s_{NN}}$ = 39 GeV up to $\sqrt{s_{NN}}$=200 GeV, followed by a saturation up to the highest energy of $\sqrt{s_{NN}}$ =5.02 TeV in Pb-Pb collisions. A clear change in the dependence of $(1-R_{AA}^{π^0})/\langle dN/dy \rangle$ for the most central collisions as a function of collision energy is evidenced in the region of $\sqrt{s_{NN}}$ =62.4 - 130 GeV.

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