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arXiv 1208.6256hep-ex
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用TeV测量sqrt(s)= 7时质子-质子碰撞总横能与赝快度的关系

Measurements of the pseudorapidity dependence of the total transverse energy in proton-proton collisions at sqrt(s) = 7 TeV with ATLAS

ATLAS Collaboration

摘要:

本文描述了在大型强子对撞机上用ATLAS探测器测量质量中心能量为7 TeV的质子-质子碰撞中粒子横向能量之和与粒子赝快度η的关系。在区域|eta| < 4.8中对两类事件进行测量:需要存在具有低横向动量的粒子的事件和需要具有显著横向动量的粒子的事件。在第二数据集中,在硬散射的横向区域中进行测量。的分布进行比较的各种蒙特卡罗事件发生器,这通常倾向于低估的横向能量在高|eta|的预测。

英文摘要:

This paper describes measurements of the sum of the transverse energy of particles as a function of particle pseudorapidity, eta, in proton-proton collisions at a centre-of-mass energy, sqrt(s) = 7 TeV using the ATLAS detector at the Large Hadron Collider. The measurements are performed in the region |eta| < 4.8 for two event classes: those requiring the presence of particles with a low transverse momentum and those requiring particles with a significant transverse momentum. In the second dataset measurements are made in the region transverse to the hard scatter. The distributions are compared to the predictions of various Monte Carlo event generators, which generally tend to underestimate the amount of transverse energy at high |eta|.

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