Measurement of the top quark mass in topologies enhanced with single top quarks produced in the t-channel using flavour tagging and a neural network with ATLAS data at √s = 8TeV

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dc.contributor.advisorKlingenberg, Reiner
dc.contributor.authorEsch, Hendrik
dc.contributor.refereeWagner, Wolfgang
dc.date.accepted2014-10-24
dc.date.accessioned2015-01-16T15:14:01Z
dc.date.available2015-01-16T15:14:01Z
dc.date.issued2015-01
dc.description.abstractIn this thesis a measurement of the top quark mass in topologies that have been enhanced with single-top quark decays in the t-channel produced via weak interactions is presented. The dataset consists of proton-proton collisions at a centre-of-mass energy of sqrt(s) = 8 TeV collected with the ATLAS detector at the LHC with a total integrated luminosity of L = 20.3 1/fb. Selected events contain exactly one charged lepton - which can be either an electron or a muon -, missing transverse energy and two jets with exactly one of the two being b-tagged. The techniques of b-tagging used to identify jets induced by heavy quarks is explained further. In addition, the signal is enhanced using a neural network based discriminant that combines the ability to discriminate between signal and background of several correlated variables. To determine the mass of the top quark a template method is used in combination with the mass sensitive variable, m(l b), which is the invariant mass of the lepton and the b-tagged jet. The top quark mass is measured as m(top) = [172.2 +/- 0.7 (stat.) +/- 1.9 (syst.)] GeV.en
dc.identifier.urihttp://hdl.handle.net/2003/33811
dc.identifier.urihttp://dx.doi.org/10.17877/DE290R-6947
dc.language.isoende
dc.subjectATLASde
dc.subjectCERNde
dc.subjectLHCde
dc.subjectB-taggingen
dc.subjectParticle physicsen
dc.subjectTop quarken
dc.subjectTop quark massen
dc.subjectFlavour taggingen
dc.subjectNeural networken
dc.subjectSingle top quark productionen
dc.subjectT-channelen
dc.subject.ddc530
dc.subject.rswkATLAS <Teilchendetektor>de
dc.subject.rswkLHCde
dc.subject.rswkt-Quarkde
dc.subject.rswkLuminosität <Elementarteilchenphysik>de
dc.subject.rswkZerfallde
dc.subject.rswkLeptonde
dc.titleMeasurement of the top quark mass in topologies enhanced with single top quarks produced in the t-channel using flavour tagging and a neural network with ATLAS data at √s = 8TeVen
dc.typeTextde
dc.type.publicationtypedoctoralThesisen
dcterms.accessRightsopen access

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