Reconstruction of signal amplitudes in the CMS electromagnetic calorimeter in the presence of overlapping proton-proton interactions
Reconstruction of signal amplitudes in the CMS electromagnetic calorimeter in the presence of overlapping proton-proton interactions
复制标题
重叠式质子-质子相互作用下CMS电磁量热仪信号幅度的重建
DOI：
10.1088/1748-0221/15/10/p10002
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发表时间：
2020-06
影响因子：
1.3
通讯作者：
Cms Collaboration
中科院分区：
文献类型：
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作者：
Cms Collaboration
本文描述了一种用于重建CMS电磁量能器中钨酸铅晶体产生的信号幅度的模板拟合技术。这种新颖的方法被设计为抑制的信号的数量增加的超时间的相互作用，每个光束交叉以下的加速器聚束间距从50到25 ns的开始运行2的大型强子对撞机的减少的贡献。该算法的执行速度非常快，可以在CMS高级触发器中使用。它也被用于地震事件的重建。从模拟和运行2碰撞数据（2015-2018）获得的结果表明，在从几个GeV到几十个GeV的能量范围内，量热计的能量分辨率有了实质性的提高。
: A template fitting technique for reconstructing the amplitude of signals produced by the lead tungstate crystals of the CMS electromagnetic calorimeter is described. This novel approach is designed to suppress the contribution to the signal of the increased number of out-of-time interactions per beam crossing following the reduction of the accelerator bunch spacing from 50 to 25 ns at the start of Run 2 of the LHC. Execution of the algorithm is sufficiently fast for it to be employed in the CMS high-level trigger. It is also used in the offline event reconstruction. Results obtained from simulations and from Run 2 collision data (2015–2018) demonstrate a substantial improvement in the energy resolution of the calorimeter over a range of energies extending from a few GeV to several tens of GeV.