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 up to 19.7 fb−1. The resolution of missing transverse momentum, including the effects of pileup interactions and advanced reconstruction algorithms, are measured using events with an identified Z boson or isolated photon.
Highlights
The Compact Muon Solenoid (CMS) detector [1] can detect most species of stable particles produced in proton-proton collisions delivered by the Large Hadron Collider (LHC)
Precise calibration of all reconstructed physics objects is crucial for the E/ T performance, and E/ T is sensitive to multiple proton-proton interactions in the same, earlier, and later bunch crossings
To help identify such events, we have developed a missing transverse energy significance variable, which we will denote by ”E/ T Significance”, or S
Summary
The Compact Muon Solenoid (CMS) detector [1] can detect most species of stable particles produced in proton-proton collisions delivered by the Large Hadron Collider (LHC). 3. Reconstruction of MET We define E/ T as the imbalance in the transverse momentum of all particles in the final state of proton-proton collisions that interact via the electromagnetic or strong forces. The E/ T reconstructed using a particle-flow technique (PF E/ T) is used in the majority of CMS analyses It is defined as the negative vectorial sum over all PF particles transverse momenta. 4. Measurement of the MET resolution The performance of the E/ T reconstruction is assessed using events where an identified Z boson or isolated photon is present. Using the well-measured and well-understood vector boson momentum as a reference, we are able to measure the scale and doi:10.1088/1742-6596/587/1/012006 number of events / 4 GeV. For each additional pileup interaction, the PF E/ T resolution is degraded by around 3.4 GeV in quadrature
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