论文标题
$ pp $，$ p $+pb，pb+pb和xe+xe Collisions的充电 - hadron生产在$ \ sqrt {s _ {_ {_ \ text {nn}}} = 5 $ tev with LHC的Atlas检测器
Charged-hadron production in $pp$, $p$+Pb, Pb+Pb, and Xe+Xe collisions at $\sqrt{s_{_\text{NN}}}=5$ TeV with the ATLAS detector at the LHC
论文作者
论文摘要
This paper presents measurements of charged-hadron spectra obtained in $pp$, $p$+Pb, and Pb+Pb collisions at $\sqrt{s}$ or $\sqrt{s_{_\text{NN}}}=5.02$ TeV, and in Xe+Xe collisions at $ \ sqrt {s _ {_ \ text {nn}}}} = 5.44 $ tev。 ATLAS检测器在LHC记录的数据具有25 pb $ {}^{ - 1} $，28 nb $ {}^{ - 1} $，0.50 nb $ {}^{ - 1} $，和3 $ B $ $ $ $ $ b $ {}^{ - 1} $相应的整体集成发光度。核修饰因子$ r_ {p \ text {pb}} $和$ r_ \ text {aa} $是通过比较重型离子中的光谱和$ pp $碰撞的各种带电粒子横向动量和伪造性的。核修饰因子$ r_ {p \ text {pb}} $显示了一个高于统一的中等增强功能，最大值为$ p _ {\ mathrm {t}}} \大约3 $ gev;增强在PB驱动方向上更强。 PB+PB和XE+XE碰撞中的核修饰因子具有重要的，中心依赖性的抑制。他们显示出类似的独特$ p _ {\ mathrm {t}} $ - 依赖性，其本地最大值为$ p _ {\ mathrm {\ mathrm {t}}} \大约2 $ gev和$ p _ {\ mathrm {t}}}} \ of的本地最小值。这种依赖性在更中心的碰撞中更可区分。找不到明显的$ |η| $依赖性。还提供了几个理论预测的全面比较。他们通常在中央碰撞中和$ p _ {\ mathrm {t}} $中的$ r_ \ text {aa} $更好地描述了大约10到100 GEV。
This paper presents measurements of charged-hadron spectra obtained in $pp$, $p$+Pb, and Pb+Pb collisions at $\sqrt{s}$ or $\sqrt{s_{_\text{NN}}}=5.02$ TeV, and in Xe+Xe collisions at $\sqrt{s_{_\text{NN}}}=5.44$ TeV. The data recorded by the ATLAS detector at the LHC have total integrated luminosities of 25 pb${}^{-1}$, 28 nb${}^{-1}$, 0.50 nb${}^{-1}$, and 3 $μ$b${}^{-1}$, respectively. The nuclear modification factors $R_{p\text{Pb}}$ and $R_\text{AA}$ are obtained by comparing the spectra in heavy-ion and $pp$ collisions in a wide range of charged-particle transverse momenta and pseudorapidity. The nuclear modification factor $R_{p\text{Pb}}$ shows a moderate enhancement above unity with a maximum at $p_{\mathrm{T}} \approx 3$ GeV; the enhancement is stronger in the Pb-going direction. The nuclear modification factors in both Pb+Pb and Xe+Xe collisions feature a significant, centrality-dependent suppression. They show a similar distinct $p_{\mathrm{T}}$-dependence with a local maximum at $p_{\mathrm{T}} \approx 2$ GeV and a local minimum at $p_{\mathrm{T}} \approx 7$ GeV. This dependence is more distinguishable in more central collisions. No significant $|η|$-dependence is found. A comprehensive comparison with several theoretical predictions is also provided. They typically describe $R_\text{AA}$ better in central collisions and in the $p_{\mathrm{T}}$ range from about 10 to 100 GeV.
