Measurement of charged-particle spectra in Pb+Pb collisions at s N N = 2.76 $$ \sqrt{s_{\mathrm{NN}}}=2.76 $$ TeV with the ATLAS detector at the LHC
Measurement of charged-particle spectra in Pb+Pb collisions at s N N = 2.76 $$ \sqrt{s_{\mathrm{NN}}}=2.76 $$ TeV with the ATLAS detector at the LHC
复制标题
使用 LHC 上的 ATLAS 探测器测量 s N N = 2.76 $$ sqrt{s_{mathrm{NN}}}=2.76 $$ TeV 时 Pb Pb 碰撞中的带电粒子光谱
DOI：
10.1007/jhep09(2015)050
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发表时间：
2015
影响因子：
5.4
通讯作者：
Aad G
中科院分区：
文献类型：
--
作者：
Aad G
在宽横向动量（0.5 < pT < 150 GeV）和伪快度（|η| < 2）范围内，利用ATLAS探测器在√sNN = 2.76TeV下Pb+Pb相互作用和√sNN = 2.76TeV下pp相互作用的积分光度分别为0.15 nb−1和4.2 Pb−1，得到了LHC上Pb+Pb相互作用的带电粒子光谱。对于Pb+Pb碰撞，光谱表现为碰撞中心性的函数，碰撞中心性由位于相互作用点两侧的正向量热计的响应决定。详细介绍了核修饰因子RAA和RCP作为中心性、pT和η的函数。它们表现出明显的pt依赖性，在约7 GeV时最小值明显。在60 GeV以上，在不确定度范围内，RAA与中心性相关值的平台一致。该值为0.55±0.01（stat.）±0.04（系统）在最中心的碰撞。在所有中心性类的整个横向动量范围内，RAA分布与|η|的平坦依赖性一致。
Charged-particle spectra obtained in Pb+Pb interactions at √sNN = 2.76TeV and pp interactions at √sNN = 2.76TeV with the ATLAS detector at the LHC are presented, using data with integrated luminosities of 0.15 nb−1 and 4.2 pb−1, respectively, in a wide transverse momentum (0.5 < pT < 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 calorimeters located on both sides of the interaction point. The nuclear modification factors RAA and RCP are presented in detail as a function of centrality, pT and η. They show a distinct pT-dependence with a pronounced minimum at about 7 GeV. Above 60 GeV, RAA is consistent with a plateau at a centralitydependent value, within the uncertainties. The value is 0.55 ± 0.01(stat.) ± 0.04(syst.) in the most central collisions. The RAA distribution is consistent with flat |η| dependence over the whole transverse momentum range in all centrality classes.