论文标题
关于抑制带电颗粒的考虑和高能重离子碰撞的$π^0 $
Considerations on the suppression of charged particles and $π^0$ in high energy heavy ion collisions
论文作者
论文摘要
与带电粒子和$π^{0} $相关的实验结果，在Brookhaven的相对论重离子对撞机（RHIC）获得了au-au（Cu-cu）碰撞的相对性，并在pb-pb（xe-xe）的CERN上获得了大型强子对撞机（lhc），以使用$ nifife usifify usifify usifify usifify usifify usifify $ rifife andifie $ rifife atifie $ r_ {cp} $，以及新引入的$ r^{n} _ {aa} $和$ r^{n} _ {cp} $作为$ \ langle n_ {part} \ rangle $ and $ \ langle dn_ dn_ {ch ch}/dη\ rangle $ rangle n_ {part} \ langle n_ {part}这些研究集中在实验中证明的最大抑制区域的$ P_T $范围上。提出了对$ r_ {aa} $的核心贡献。提出了对7 TEV处PP碰撞的高电荷粒子多重事件中缺失的抑制作用的考虑。 $ r_ {cp} $和$ r^n_ {cp} $的趋势和$ r_ {aa}^{π^0} $和$（r_ {aa}^n）^n）^{π^{π^0} $作为$ \ \ sqrt at的功能LHC在PB-PB发生冲突中显示出一种抑制作用，该抑制作用从$ \ sqrt {s_ {nn}} $ = 39 GEV高达$ \ sqrt {s_ {nn}} $ = 200 GEV，随后是$ \ \ sqrt的最高能量，然后是$ \ sqrt {s_ colivision {collivion {collivion {collivion {collivion {collivion {collivion {s_ collivion {collivion {collivion {collivion {collivion {collivision。 $（1 -r_ {aa}^{π^0}）/\ langle dn/dy \ rangle $的$（1 -r_ {aa}^{π^0}）的依赖性的明显变化在$ \ sqrt {s_ {s_ {nn}} $ = 62.4-130 gev中得到了证明。
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.
