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Luminosity determination in pp collisions at s=7 TeV using the ATLAS detector at the LHC

ATLAS, Collaboration; Aad, Georges; Abbott, Brad; Abdallah, Jalal; Abdelalim, A. A.; Buanes, Trygve
Peer reviewed, Journal article
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URI
https://hdl.handle.net/1956/5255
Date
2011-04-27
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  • Department of Physics and Technology [1816]
Original version
https://doi.org/10.1140/epjc/s10052-011-1630-5
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.
Description
There are approximately 2250 authors. Only a few of them have been given author entries in addition to the Collaboration.
Publisher
Springer
Copyright
Copyright The Author(s) 2011

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