论文标题
通过CERN LHC的CMS实验的电子和光子重建和识别
Electron and photon reconstruction and identification with the CMS experiment at the CERN LHC
论文作者
论文摘要
通过在LHC处的CMS实验，对电子和光子的重建和识别算法提出了性能。报告的结果基于在13 TEV的质量中心能量收集的质子 - 普罗顿碰撞数据，并于2016-2018记录，对应于136 fb $^{ - 1} $的集成光度。还显示了从$ \ sqrt {s_ \ mathrm {nn}} = $ 5.02 TEV收集的铅铅碰撞数据获得的结果。创新技术用于重建检测器中的电子和光子信号并优化能量分辨率。在最终状态下具有电子和光子的事件用于测量记录事件中的能量分辨率和能量尺度的不确定性。质子蛋白碰撞数据中Z玻色子衰减中产生的电子的测得的能量分辨率范围为2％至5％，具体取决于探测器材料中的Bremsstrahlung的电子伪损失和能量损失。在质子 - 蛋白质碰撞中，在枪管（端盖）区域的不确定性小于0.1（0.3）％的不确定性测量相同范围的能量尺度，在重离子碰撞中，枪管（Endcap）区域中的能量尺度大于1（3）％。 Z Boson衰减的电子的时序分辨率与完整的2016-2018 Proton-Proton碰撞数据集测量为200 ps。
The performance is presented of the reconstruction and identification algorithms for electrons and photons with the CMS experiment at the LHC. The reported results are based on proton-proton collision data collected at a center-of-mass energy of 13 TeV and recorded in 2016-2018, corresponding to an integrated luminosity of 136 fb$^{-1}$. Results obtained from lead-lead collision data collected at $\sqrt{s_\mathrm{NN}} =$ 5.02 TeV are also presented. Innovative techniques are used to reconstruct the electron and photon signals in the detector and to optimize the energy resolution. Events with electrons and photons in the final state are used to measure the energy resolution and energy scale uncertainty in the recorded events. The measured energy resolution for electrons produced in Z boson decays in proton-proton collision data ranges from 2 to 5%, depending on electron pseudorapidity and energy loss through bremsstrahlung in the detector material. The energy scale in the same range of energies is measured with an uncertainty smaller than 0.1 (0.3)% in the barrel (endcap) region in proton-proton collisions and better than 1 (3)% in the barrel (endcap) region in heavy ion collisions. The timing resolution for electrons from Z boson decays with the full 2016-2018 proton-proton collision data set is measured to be 200 ps.
