vbid/9783319739304

Description

This thesis presents two production cross-section measurements of pairs of massive bosons using �nal states with leptons, made with the ATLAS detector at the Large Hadron Collider. The �rst measurement, performed using data collected in 2012 at center-of-mass energy � s = 8 TeV, is the �rst �ducial and di?erential cross-section measurement of the production of the Higgs Boson when it decays to four charged leptons (electrons or muons). The second measurement is the �rst �ducial and inclusive production cross-section measurement of WZ pairs at center-of-mass energy � s = 13 TeV using �nal states with three charged leptons. A signi�cant portion of the thesis focuses on the methods used to identify electrons from massive boson decay�important for many �agship measurements�and on assessing the e?ciency of these particle identi�cation techniques. The chapter discussing the WZ pair cross-section measurement provides a detailed example of an estimate of lepton background in the context of an analysis with three leptons in the �nal state.Typham this is the title: Physics with Electrons in the ATLAS Detector