Yetkin, Elif Aslı2020-11-062020-11-062020-091748-0221https://hdl.handle.net/11411/2488https://doi.org/10.1088/1748-0221/15/09/P0901859 pagesWith increasing instantaneous luminosity at the LHC come additional reconstruction challenges. At high luminosity, many collisions occur simultaneously within one proton-proton bunch crossing. The isolation of an interesting collision from the additional "pileup" collisions is needed for effective physics performance. In the CMS Collaboration, several techniques capable of mitigating the impact of these pileup collisions have been developed. Such methods include charged-hadron subtraction, pileup jet identification, isospin-based neutral particle "delta beta" correction, and, most recently, pileup per particle identification. This paper surveys the performance of these techniques for jet and missing transverse momentum reconstruction, as well as muon isolation. The analysis makes use of data corresponding to 35.9 fb(-1) collected with the CMS experiment in 2016 at a center-of-mass energy of 13 TeV. The performance of each algorithm is discussed for up to 70 simultaneous collisions per bunch crossing. Significant improvements are found in the identification of pileup jets, the jet energy, mass, and angular resolution, missing transverse momentum resolution, and muon isolation when using pileup per particle identification.1 Introduction 1 2 The CMS detector 2 3 Data and simulated samples 3 4 The CHS and PUPPI algorithms 5 4.1 Data-to-simulation comparison for variables used within PUPPI 7 5 Jet reconstruction 9 5.1 Jet energy and angular resolutions 10 5.2 Noise jet rejection 12 5.3 Pileup jet rejection 16 6 W, Z, Higgs boson, and top quark identification 22 6.1 Jet substructure reconstruction 22 6.2 Identification performance and pileup 24 7 Missing transverse momentum resolution 27 8 Muon isolation 28 9 Summary 34 The CMS collaboration 39eninfo:eu-repo/semantics/openAccessLarge detector-systems performanceCalorimetersCalorimeter methodsArticle10.1088/1748-0221/15/09/P09018Q3WOS:000577273400018