Measurement of the missing transverse energy with the ATLAS Calorimeter

The measurement of missing transverse momentum in the ATLAS detector makes use of the full event reconstruction and a calibration based on reconstructed physics objects. The performance of the missing transverse momentum reconstruction is evaluated using data collected in $pp$ collisions at a center-of-mass energy of 7 TeV in 2010 and 2011. Minimum bias events and events with jets of hadrons are used from data samples corresponding to an integrated luminosity of about 0.3/nb and 600/nb respectively, together with events containing a Z-boson decaying to two leptons (electrons or muons) or a W-boson decaying to a lepton (electron or muon) and a neutrino from a data sample corresponding to an integrated luminosity of about 36/pb. An estimate of the systematic uncertainty on the missing transverse momentum scale is presented.