文摘

This paper presents the performance of the ATLAS muon reconstruction during the LHC run with \(pp\) collisions at \(\sqrt{s}=7\) -?TeV in 2011-012, 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 \({J/\psi \rightarrow \mu \mu }\) , \(Z \rightarrow \mu \mu \) and \({\Upsilon \rightarrow \mu \mu }\) 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 | 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.