title: WWγ and WZγ production at the ATLAS experiment
creator: Baas, Alessandra Edda
subject: ddc-530
subject: 530 Physics
description: The study of three electroweak gauge bosons is not only a precise test of the electroweak structure of the Standard Model, but it is also sensitive to new physics. In this thesis, the measurement of WWγ and WZγ production in proton−proton collisions is presented, in which events are analysed where the W boson decays leptonically and the other heavy gauge boson decays hadronically. Two decay channels differing in the flavour of the final state lepton are studied: the electron and the muon channel. The analysed proton−proton collisions are recorded in 2012 with the ATLAS experiment at a centre-of-mass energy of √s = 8 TeV and correspond to an integrated luminosity of 20.2 fb⁻¹. Exclusion limits on the production cross section are  derived at 95 % confidence level (CL) in two different phase space regions: one is optimised for the Standard Model production and one for the search of new physics beyond the Standard Model. The best upper limits on the WWγ and WZγ production, determined in this analysis, exclude cross sections above 2.5 times the Standard Model expectation. In addition, Frequentist limits at 95% CL are derived on fourteen different anomalous quartic gauge couplings of mass  dimension eight, using the framework of an effective field theory. The exclusion limits are presented with and without unitarisation.
date: 2017
type: Dissertation
type: info:eu-repo/semantics/doctoralThesis
type: NonPeerReviewed
format: application/pdf
identifier: https://archiv.ub.uni-heidelberg.de/volltextserverhttps://archiv.ub.uni-heidelberg.de/volltextserver/23302/1/PhD_ABaas.pdf
identifier: DOI:10.11588/heidok.00023302
identifier: urn:nbn:de:bsz:16-heidok-233023
identifier:   Baas, Alessandra Edda  (2017) WWγ and WZγ production at the ATLAS experiment.  [Dissertation]     
relation: https://archiv.ub.uni-heidelberg.de/volltextserver/23302/
rights: info:eu-repo/semantics/openAccess
rights: http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html
language: eng