Improved luminosity determination in pp collisions at √s = 7 TeV using the ATLAS detector at the LHC
Abstract
The luminosity calibration for the ATLAS detector at the LHC during pp collisions at √s = 7 TeV in 2010 and 2011 is presented. Evaluation of the luminosity scale is performed using several luminosity-sensitive detectors, and comparisons are made of the long-term stability and accuracy of this calibration applied to the pp collisions at √s = 7 TeV. A luminosity uncertainty of δL/L = ±3.5 % is obtained for the 47 pb−1 of data delivered to ATLAS in 2010, and an uncertainty of δL/L = ±1.8 % is obtained for the 5.5 fb−1 delivered in 2011.
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