Measurement of the muon reconstruction performance of the ATLAS detector using 2011 and 2012 LHC proton–proton collision data
(CERN, 1211 Geneva 23, Switzerland); G. Aad (CPPM, Aix-Marseille Université and CNRS/IN2P3, Marseille, France); B. Abbott (Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman, OK, USA); J. Abdallah (Institute of Physics, Academia Sinica, Taipei, Taiwan); S. Abdel Khalek (LAL, Université Paris-Sud and CNRS/IN2P3, Orsay, France); et al - Show all 2892 authors
This paper presents the performance of the ATLAS muon reconstruction during the LHC run with pp collisions at s=7 â8 TeV in 2011â2012, 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/Ïâμμ , Zâμμ and Î¥âμμ 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 |η|<2.7 and 5â²pTâ²100  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 pTâ10  GeV, to 4% at large rapidity and pTâ100  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.