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arXiv 1802.02022hep-exnucl-ex
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用ATLAS探测器测量铅-铅碰撞中的带电强子谱和核修正因子

Measurement of the charged-hadron spectra and nuclear modification factor in lead--lead collisions with the ATLAS detector

Petr Balek

摘要:

大型强子对撞机(LHC)的ATLAS实验测量了2010年和2011年铅-铅LHC数据中获得的带电强子谱,总积分统计为0.15 nb ${}^{-1}$。与2011年和2013年ATLAS实验获得的积分光度为4.2pb ${}^{-1}$的数据样本的相同质心能量下带电强子的$pp$谱进行了比较。这使得两个碰撞系统的详细比较,在一个广泛的横向动量($0.5<p_{\mathrm{T}}<150$ GeV)和赝快度($|η|<2$)的范围内,在不同的中心间隔的Pb+Pb碰撞。详细介绍了核修饰因子$R_{\mathrm{AA}}$作为中心性、$p_{\mathrm{T}}$和$η$的函数。它表现出明显的$p_{\mathrm{T}}$依赖性,在约7 GeV处具有明显的最小值。在60 GeV以上,它与不确定性范围内的平坦的、中心依赖的值一致。在最中心的碰撞中,该值为$0.55\pm0.01(stat.)\pm0.04(syst.)$。观察到的$R_{\mathrm{AA}}$是一致的平坦的$|η|$依赖在整个横向动量范围内的所有中心类。

英文摘要:

The ATLAS experiment at the Large Hadron Collider (LHC) measures charged hadron spectra obtained in 2010 and 2011 lead-lead LHC data taking periods with total integrated statistics of 0.15nb${}^{-1}$. The results are compared to the $pp$ spectra of charged hadrons at the same centre-of-mass energy based on the data sample with integrated luminosity of 4.2pb${}^{-1}$ obtained by the ATLAS experiment in 2011 and 2013. This allows a detailed comparison of the two collision systems in a wide transverse momentum ($0.5<p_{\mathrm{T}}<150$GeV) and pseudorapidity ($|η|<2$) ranges in different centrality intervals of Pb+Pb collision. The nuclear modification factor $R_{\mathrm{AA}}$ is presented in detail as a function of centrality, $p_{\mathrm{T}}$ and $η$. It shows a distinct $p_{\mathrm{T}}$-dependence with a pronounced minimum at about 7GeV. Above 60GeV, it is consistent with a flat, centrality-dependent, value within the uncertainties. The value is $0.55\pm0.01(stat.)\pm0.04(syst.)$ in the most central collisions. The $R_{\mathrm{AA}}$ is observed to be consistent with flat $|η|$ dependence over the whole transverse momentum range in all centrality classes.

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