标题： CMS中MET重建及堆叠抑制技术的性能 显示英文标题

标题： Performance of MET reconstruction and pileup mitigation techniques in CMS

摘要： 缺失横向动量重建算法的性能使用CMS探测器采集的8 TeV质子-质子碰撞数据进行展示，对应的积分亮度为$12.2 \pm 0.5$ $\mathrm{fb^{-1}}$ 。 通过已识别的Z玻色子或孤立光子事件测量缺失横向动量的尺度和分辨率以及多质子-质子相互作用（堆叠）的影响。 这些一般由模拟很好地描述。 还开发了先进的缺失横向动量重建算法，专门用于减轻大量堆叠相互作用对缺失横向动量分辨率的影响。 使用这些先进算法，缺失横向动量分辨率与堆叠相互作用的依赖性显著降低。 显示英文摘要

摘要： The performance of missing transverse momentum reconstruction algorithms is presented using 8 TeV pp collision data collected with the CMS detector, corresponding to an integrated luminosity of $12.2 \pm 0.5$ $\mathrm{fb^{-1}}$. The scale and resolution of missing transverse momentum and the effects of multiple proton-proton interactions (pileup), are measured using events with an identified Z boson or isolated photon. They are in general well described by the simulation. Advanced missing transverse momentum reconstruction algorithms are also developed specifically to mitigate the effects of large numbers of pileup interactions on missing transverse momentum resolution. Using these advanced algorithms, the dependence of the missing transverse momentum resolution on pileup interactions is reduced significantly.