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Abstract
This paper presents the performance of the ATLAS muon reconstruction during the LHC
run with \(pp\) collisions at \(\sqrt{s}=7-8\) TeV in 2011-2012, focusing mainly on data
collected in 2012. Measurements of the reconstruction efficiency and of the momentum
scale and resolution, based on large reference samples of \(J/\psi\to \mu\mu\), \(Z\to
\mu\mu\) and \(\Upsilon\to\mu\mu\) decays, are presented and compared to Monte Carlo
simulations. Corrections to the simulation, to be used in physics analysis, are provided.
Over most of the covered phase space (muon \(|\eta|<2.7\) and \(5 \lesssim p_{\mathrm{T}}
\lesssim 100\) GeV) the efficiency is above \(99\%\) and is measured with per-mille precision.
The momentum resolution ranges from \(1.7\%\) at central rapidity and for transverse
momentum \(p_{\mathrm{T}} \simeq 10\) GeV, to \(4\%\) at large rapidity and \(p_{\mathrm{T}}
\simeq 100\) GeV. The momentum scale is known with an uncertainty of \(0.05\%\) to \(0.2\%\)
depending on rapidity. A method for the recovery of final state radiation from the
muons is also presented.
Comments 21 pages plus author list + cover pages (34 pages total), 21 figures,
2 tables, submitted to EPJC, All figures including auxiliary figures are
available at
http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/PERF-2014-05/