9-13 July 2012
Measurement of the Missing Transverse Momentum based on tracks in proton-proton collisions at sqrt(s) = 7 TeV centre-of-mass energy with the ATLAS detector
Presented by Mrs. Claire LEE on 10 Jul 2012 from 15:30 to 15:50
Type: Oral Presentation
Track: Track B - Nuclear, Particle and Radiation Physics
The estimation of missing transverse energy (MET) is essential for a wide range of physics analyses, from Standard Model and precision electroweak measurements to searches for the Higgs boson and new physics such as supersymmetry. The MET is calculated using measurements from the ATLAS calorimeters, and while the performance and systematics of the calorimeter and MET is well understood, the measurement itself is highly dependent on pileup in the event. We calculate the missing transverse momentum (or, track MET) using tracks coming from the signal vertex to get a pileup-independent alternative measurement of the MET, with uncorrelated systematic effects. The track MET also is less affected by cosmics and beam background due to the quality cuts required to include a track in the calculation. We present the performance of the track MET measurement in ATLAS in several physics processes, and discuss its application in Higgs boson searches.
Simon Connell, University of Johannesburg email@example.com