Performance of MET reconstruction and pileup mitigation techniques in CMS

TL;DR

This paper evaluates the performance of missing transverse momentum reconstruction in CMS at 8 TeV, demonstrating how advanced algorithms effectively mitigate pileup effects to improve resolution.

Contribution

It introduces and tests advanced MET reconstruction algorithms specifically designed to reduce pileup impact in CMS data analysis.

Findings

Standard MET performance is well modeled by simulation.

Advanced algorithms significantly reduce pileup dependence.

Improved MET resolution with high pileup conditions.

Abstract

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.