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

Khachatryan, V. and Sirunyan, A. M. and Tumasyan, A. and Adam, W. and Bergauer, T. and Filipovic, Nicolas and Bencze, György and Hajdu, Csaba and Hidas, Pál and Horváth, Dezső and Siklér, Ferenc and Veszprémi, Viktor and Vesztergombi, György and Zsigmond, Anna Júlia and Karancsi, János and Molnár, József and Trócsányi, Zoltán and Ujvári, Balázs and Veres, Gábor (2015) Performance of the CMS missing transverse momentum reconstruction in pp data at √s = 8 TeV. JOURNAL OF INSTRUMENTATION, 10 (2). ISSN 1748-0221

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Abstract

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 algo- rithms used to identify and remove these events is presented. The scale and resolu- tion 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 en- ergy reconstruction algorithms developed specifically to mitigate the effects of large numbers of pileup interactions on the missing transverse energy resolution are pre- sented. These algorithms significantly reduce the dependence of the missing trans- verse 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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