Missing ET Reconstruction with the CMS Detector

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 √s = 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.