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arXiv 1302.3424hep-exnucl-ex
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用LHC上的ATLAS探测器在sqrt(s_NN)=2.76TeV的铅-铅碰撞中产生的带电强子的谱和核修正因子

Spectra and nuclear modification factor of charged hadrons produced in lead-lead collisions at sqrt(s_NN)=2.76TeV with the ATLAS detector at the LHC

Petr Balek

摘要:

重离子碰撞中带电粒子谱的测量是研究在这些相互作用中产生的热而致密物质的性质的一种方法。光谱形状的中心依赖性是理解能量损失机制的重要工具。大型强子对撞机上的ATLAS探测器在每个核子-核子对2.76 TeV时积累的积分亮度等于0.15 nb ^{-1}的铅-铅数据。由于ATLAS探测器的卓越性能,以及其在2010年和2011年重离子物理运行中的稳定运行,这些数据允许在宽范围的横动量(0.5- 150 GeV)和赝快度(|eta| <2.5)内测量带电粒子谱及其在不同中心度仓中的比率。在pT= 7 GeV时,测量的中心与外周事件的比率显示了5倍的抑制。在较高的pT下,该比率增加。

英文摘要:

The measurement of charged particle spectra in heavy ion collisions is a way to study properties of hot and dense matter created in these interactions. The centrality dependence of the spectral shape is an important tool to understand the energy loss mechanism. The ATLAS detector at the LHC accumulated integrated luminosity equal to 0.15nb^{-1} of lead-lead data at 2.76TeV per nucleon-nucleon pair. Due to the excellent capabilities of the ATLAS detector, and its stable operation in 2010 and 2011 heavy ion physics runs, these data allow measurements of the charged particle spectra and their ratios in different centrality bins over a wide range of transverse momenta (0.5-150GeV) and pseudorapidity (|eta|<2.5). The measured ratio central to peripheral events shows a suppresion by a factor of 5 at pT=7GeV. At higher pT the ratio increases.

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