2011/01/11 by G. Aad, The ATLAS Collaboration, B. Abbott +98 · 1 citation
Physics and Astronomy · #Algorithm #Astrophysics #Atlas (anatomy) #Atlas detector #Beam (structure) #Calibration #Detector #High-Energy Particle Collisions Research #Large Hadron Collider #Luminosity #Nuclear physics #Optics #Particle Detector Development and Performance #Particle physics #Particle physics theoretical and experimental studies #Physics #Residual #Statistics #Systematic error #hep-ex
paper · pdf · doi:10.1140/epjc/s10052-011-1630-5
published as Eur.Phys.J.C71:1630,2011 · 24 pages plus author list (36 pages total). 9 Figures, 10 Tables, submitted to Journal EPJC
arxiv created 2011/01/11 · openalex publication_date 2011/04/01 · arxiv updated 2015/03/17 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
Abstract Measurements of luminosity obtained using the ATLAS detector during early running of the Large Hadron Collider (LHC) at √(s) = 7 TeV are presented. The luminosity is independently determined using several detectors and multiple algorithms, each having different acceptances, systematic uncertainties and sensitivity to background. The ratios of the luminosities obtained from these methods are monitored as a function of time and of μ , the average number of inelastic interactions per bunch crossing. Residual time- and μ -dependence between the methods is less than 2% for 0< μ <2.5. Absolute luminosity calibrations, performed using beam separation scans, have a common systematic uncertainty of ±11%, dominated by the measurement of the LHC beam currents. After calibration, the luminosities obtained from the different methods differ by at most ±2%. The visible cross sections measured using the beam scans are compared to predictions obtained with the PYTHIA and PHOJET event generators and the ATLAS detector simulation.