Performance of missing transverse momentum reconstruction in proton-proton collisions at 7 TeV with ATLAS

TL;DR

This paper evaluates the performance of missing transverse momentum reconstruction in the ATLAS detector using 7 TeV proton-proton collision data, highlighting calibration methods, systematic uncertainties, and results from various event types.

Contribution

It presents a comprehensive assessment of missing transverse momentum reconstruction performance in ATLAS at 7 TeV, including calibration techniques and systematic uncertainty estimates.

Findings

Reconstruction performance evaluated with real data

Calibration based on reconstructed physics objects

Systematic uncertainties on the momentum scale quantified

Abstract

The measurement of missing transverse momentum in the ATLAS detector, described in this paper, 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 centre-of-mass energy of 7 TeV in 2010. Minimum bias events and events with jets of hadrons are used from data samples corresponding to an integrated luminosity of about 0.3 inverse nb and 600 inverse nb, 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 inverse pb. An estimate of the systematic uncertainty on the missing transverse momentum scale is presented.