Abstract
High-precision measurements of Standard Model (SM) processes provide information on different aspects contributing to the process, such as parton distribution functions (PDFs), and comparisons with the current precision reached theoretically on the calculations of the cross sections of such processes. This document describes ATLAS measurements, performed at different centre-of-mass energies, of vector boson (W and Z) cross sections and cross-section ratios. It also discusses measurements of ratios of Z-boson and top-quark pair production cross sections, which provide important information on the proton PDFs. Finally, a measurement involving the di-lepton decay channel of top-quark pairs at 8 TeV is presented, because of its direct sensitivity to the gluon PDF.
Highlights
High-precision measurements of Standard Model (SM) processes provide information on different aspects contributing to the process, such as parton distribution functions (PDFs), and comparisons with the current precision reached theoretically on the calculations of the cross sections of such processes
Precision measurement of inclusiv√e W+, W− and Z/γ∗ production cross sections at s = 7 TeV. This incredibly precise measurement of W and Zboson cross se√ctions in the leptonic decay channels was performed at s = 7 TeV with the ATLAS detector [1], using data corresponding to an integrated luminosity of 4.7 fb−1 [2]
The backgrounds are small in both decay channels and they are evaluated using Monte Carlo (MC) simulation, apart from the multijet background, which originates from QCD events faking leptons and missing energy and it is not so-well reproduced by MC simulation
Summary
High-precision measurements of Standard Model (SM) processes provide information on different aspects contributing to the process, such as parton distribution functions (PDFs), and comparisons with the current precision reached theoretically on the calculations of the cross sections of such processes. This incredibly precise measurement of W and Zboson cross se√ctions in the leptonic decay channels was performed at s = 7 TeV with the ATLAS detector [1], using data corresponding to an integrated luminosity of 4.7 fb−1 [2].
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