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arXiv 1504.04337hep-exnucl-ex
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用LHC上的ATLAS探测器测量$\sqrt{{s}_\mathsf{NN}} = 2.76$ TeV上Pb+Pb碰撞的带电粒子谱

Measurement of charged-particle spectra in Pb+Pb collisions at $\sqrt{{s}_\mathsf{NN}} = 2.76$ TeV with the ATLAS detector at the LHC

ATLAS Collaboration

备注：
36 pages plus author list + cover pages (57 pages total), 18 figures, 4 tables, published in JHEP09(2015)050. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2011-03/
发表信息：
JHEP09(2015)050
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摘要：

在LHC的ATLAS探测器上获得的0.15 nb的${}^{-1}$的Pb+Pb相互作用在$\sqrt{{s}_\mathsf{NN}}=2.76$ TeV和4.2 pb的${}^{-1}$的pp相互作用在$\sqrt{s}=2.76$ TeV的带电粒子谱在宽的横动量（$0.5 < p_{\mathrm{T}} < 150$ GeV）和赝快度（$|η|<2$）范围内。对于Pb+Pb碰撞，光谱作为碰撞中心的函数，这是由位于相互作用点两侧的前向量热计的响应确定的。详细介绍了核修饰因子$R_{\mathrm{AA}}$和$R_{\mathrm{CP}}$作为中心性、$p_{\mathrm{T}}$和$η$的函数。他们表现出明显的$p_{\mathrm{T}}$的依赖性与一个明显的最小值在约7 GeV。在60 GeV以上，$R_{\mathrm{AA}}$在不确定性范围内与中心依赖值的平台一致。在最中心的碰撞中，该值为$0.55\pm0.01(stat.)\pm0.04(syst.)$。的$R_{\mathrm{AA}}$分布是一致的平坦的$|η|$依赖在整个横向动量范围内的所有中心类。

英文摘要：

Charged-particle spectra obtained in 0.15 nb${}^{-1}$ of Pb+Pb interactions at $\sqrt{{s}_\mathsf{NN}}=2.76$TeV and 4.2 pb${}^{-1}$ of pp interactions at $\sqrt{s}=2.76$ TeV with the ATLAS detector at the LHC are presented in a wide transverse momentum ($0.5 < p_{\mathrm{T}} < 150$ GeV) and pseudorapidity ($|η|<2$) range. For Pb+Pb collisions, the spectra are presented as a function of collision centrality, which is determined by the response of the forward calorimeter located on both sides of the interaction point. The nuclear modification factors $R_{\mathrm{AA}}$ and $R_{\mathrm{CP}}$ are presented in detail as function of centrality, $p_{\mathrm{T}}$ and $η$. They show a distinct $p_{\mathrm{T}}$-dependence with a pronounced minimum at about 7 GeV. Above 60 GeV, $R_{\mathrm{AA}}$ is consistent with a plateau at a centrality-dependent value, within the uncertainties. The value is $0.55\pm0.01(stat.)\pm0.04(syst.)$ in the most central collisions. The $R_{\mathrm{AA}}$ distribution is consistent with flat $|η|$ dependence over the whole transverse momentum range in all centrality classes.

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