Missing E_T Reconstruction with the CMS Detector

TL;DR

This paper evaluates the performance of missing transverse energy reconstruction in the CMS detector using 7 TeV collision data, highlighting the impact of pile-up and the effectiveness of mitigation techniques.

Contribution

It presents a detailed assessment of missing E_T reconstruction performance with particle-flow techniques and pile-up mitigation in CMS data at 7 TeV.

Findings

Missing E_T spectrum matches MC simulation after corrections

Pile-up degrades missing E_T performance, mitigations improve results

Reconstruction techniques are validated with 4.6 fb-1 of data

Abstract

The CMS experiment uses missing E_T to both measure processes in the Standard Model and test models of physics beyond the Standard Model. These proceedings show the performance of the missing E_T reconstruction evaluated by using 4.6 fb-1 of proton-proton collision data at the center-of-mass energy 7 TeV collected in 2011 with the CMS detector at the Large Hadron Collider. Missing E_T was reconstructed based on a particle-flow technique. Jet energy corrections were propagated to missing E_T. After anomalous signals and events were addressed, the missing E_T spectrum was well reproduced by MC simulation. The multiple proton-proton interactions in a single bunch crossing, pile-up events, degraded the performance of the missing E_T reconstruction. Mitigations of this degradation have been developed.