Improved luminosity determination in pp collisions at sqrt(s) = 7 TeV using the ATLAS detector at the LHC

TL;DR

This paper details the calibration and evaluation of luminosity measurements for the ATLAS detector during 7 TeV proton-proton collisions at the LHC, achieving uncertainties of 3.5% in 2010 and 1.8% in 2011.

Contribution

It presents a comprehensive luminosity calibration method and stability analysis for ATLAS at 7 TeV, improving measurement precision.

Findings

Luminosity uncertainty of ±3.5% in 2010 data

Luminosity uncertainty of ±1.8% in 2011 data

Stable long-term luminosity calibration over the data-taking period

Abstract

The luminosity calibration for the ATLAS detector at the LHC during pp collisions at sqrt(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 sqrt(s) = 7 TeV. A luminosity uncertainty of Delta L/L = +/- 3.5% is obtained for the 47 pb-1 of data delivered to ATLAS in 2010, and an uncertainty of Delta L/L = +/- 1.8% is obtained for the 5.5 fb-1 delivered in 2011.