arXiv 1012.07912010-12hep-ex

用ATLAS探测器测量$\sqrt{s} = 900 GeV$和7 TeV pp碰撞中的带电粒子的潜在事件特征

Measurement of underlying event characteristics using charged particles in pp collisions at $\sqrt{s} = 900 GeV$ and 7 TeV with the ATLAS detector

The ATLAS Collaboration

备注：: 36 pages plus author list (65 pages total), 12 figures, 2 tables
发表信息：: Phys. Rev. D 83 (2011) 112001
DOI：: 10.1103/PhysRevD.83.112001

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摘要：

带电粒子分布的测量，敏感的基础事件，已与ATLAS探测器在LHC进行。测量是基于收集的数据，使用最小偏置触发选择质子-质子碰撞的质心能量为900 GeV和7 TeV。“潜在事件”被定义为强子相互作用的那些方面，不是由于硬散射过程，而是由于质子的其余部分的伴随相互作用。三个区域被定义在方位角相对于最高的PT带电粒子的事件，这样的区域横向占主导地位的动量流是最敏感的基础事件。在这些区域中的每一个中，测量带电粒子多重数、pt密度和平均pt的分布。这些数据显示了一个更高的潜在事件活动比蒙特卡洛模型调整到前LHC数据预测。

英文摘要：

Measurements of charged particle distributions, sensitive to the underlying event, have been performed with the ATLAS detector at the LHC. The measurements are based on data collected using a minimum-bias trigger to select proton-proton collisions at center-of-mass energies of 900 GeV and 7 TeV. The "underlying event" is defined as those aspects of a hadronic interaction attributed not to the hard scattering process, but rather to the accompanying interactions of the rest of the proton. Three regions are defined in azimuthal angle with respect to the highest-pt charged particle in the event, such that the region transverse to the dominant momentum-flow is most sensitive to the underlying event. In each of these regions, distributions of the charged particle multiplicity, pt density, and average pt are measured. The data show a higher underlying event activity than that predicted by Monte Carlo models tuned to pre-LHC data.

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