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arXiv 1409.3433hep-ex
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用ATLAS探测器测量在$\sqrt{s}=7$ TeV上$pp$碰撞中对包含Z玻色子产生的基础事件敏感的分布

Measurement of distributions sensitive to the underlying event in inclusive Z-boson production in $pp$ collisions at $\sqrt{s}=7$ TeV with the ATLAS detector

ATLAS Collaboration

摘要:

带电粒子分布敏感的基本事件的属性的测量是包含一个Z-玻色子的事件,衰减到电子或μ子对的包容性样本。测量是基于收集的数据,使用ATLAS探测器在大型强子对撞机在质子-质子碰撞在一个中心的质量能量为7 TeV的积分亮度的$4.6$ fb $^{-1}$。带电粒子多重性和带电粒子的横向动量的分布测量的方位角相对于Z-玻色子方向定义的区域。所测得的分布进行比较,类似的分布测量的射流事件,并实现不同的底层事件模型的各种蒙特卡罗发电机的预测。

英文摘要:

A measurement of charged-particle distributions sensitive to the properties of the underlying event is presented for an inclusive sample of events containing a Z-boson , decaying to an electron or muon pair. The measurement is based on data collected using the ATLAS detector at the LHC in proton-proton collisions at a centre-of-mass energy of 7 TeV with an integrated luminosity of $4.6$ fb$^{-1}$. Distributions of the charged particle multiplicity and of the charged particle transverse momentum are measured in regions of azimuthal angle defined with respect to the Z-boson direction. The measured distributions are compared to similar distributions measured in jet events, and to the predictions of various Monte Carlo generators implementing different underlying event models.

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