Performance of the CMS missing transverse energy reconstruction in pp data at sqrt(s) = 8 TeV

TL;DR

This paper evaluates the performance of missing transverse energy reconstruction algorithms in CMS pp collision data at 8 TeV, introducing new algorithms to mitigate pileup effects and assess the significance of missing energy.

Contribution

The paper presents novel algorithms for missing transverse energy reconstruction that reduce pileup dependence and introduces a significance estimator for missing energy.

Findings

Reconstructed missing transverse energy scale and resolution match simulations.

New algorithms significantly mitigate pileup effects on missing energy resolution.

The significance estimator effectively assesses the compatibility of missing energy with zero.

Abstract

The performance of missing transverse energy reconstruction algorithms is presented using sqrt(s) = 8 TeV proton-proton (pp) data collected with the CMS detector. Events with anomalous missing transverse energy are studied, and the performance of algorithms used to identify and remove these events is presented. The scale and resolution 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 energy reconstruction algorithms developed specifically to mitigate the effects of large numbers of pileup interactions on the missing transverse energy resolution are presented. These algorithms significantly reduce the dependence of the missing transverse 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.