Performance of the CMS missing transverse momentum reconstruction in pp data at √s = 8 TeV

Performance of the CMS missing transverse momentum reconstruction in pp data at √s = 8 TeV
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CMS 的性能在 pp 数据中缺少横向动量重建,as = 8 TeV

DOI:
10.1088/1748-0221/10/02/p02006
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发表时间:
2015
影响因子:
1.3
通讯作者:
(GRK 1694: D. Haitz)
(GRK 1694: D. Haitz)
中科院分区:
工程技术4区
文献类型:
--
作者:
CMS Collaboration;Khachatryan;Vardan;others;(GRK 1694: D. Haitz)

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利用√S=8TeV质子-质子(PP)数据,给出了缺失横向能量重建算法的性能。对具有异常丢失横向能量的事件进行了研究,并给出了识别和删除这些事件的算法的性能。丢失横向能量的尺度和分辨率,包括多个pp相互作用(堆积)的影响,是使用识别的Z玻色子或孤立光子的事件测量的,并被发现被模拟很好地描述。提出了一种新的遗漏横向能量重建算法,该算法是为了减小大量堆积相互作用对遗漏横向能量分辨率的影响而开发的。这些算法显著降低了丢失的横向能量分辨率对堆积作用的依赖。最后,给出了一种估计丢失横向能量重要性的算法,该算法用于估计重建的丢失横向能量与零标称值的兼容性。
The performance of missing transverse energy reconstruction algorithms is presented using√ s= 8 TeV proton-proton (pp) data collected with the CMS detector. Events with anomalous missing transverse energy are studied, and the performance of algorithms used to identify and remove these events is presented. The scale and resolution for missing transverse energy, including the effects of multiple pp interactions (pileup), are measured using events with an identified Z boson or isolated photon, and are found to be well described by the simulation. Novel missing transverse energy reconstruction algorithms developed specifically to mitigate the effects of large numbers of pileup interactions on the missing transverse energy resolution are presented. These algorithms significantly reduce the dependence of the missing transverse energy resolution on pileup interactions. Finally, an algorithm that provides an estimate of the significance of the missing transverse energy is presented, which is used to estimate the compatibility of the reconstructed missing transverse energy with a zero nominal value.
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