Full metadata record
DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | Klingenberg, Reiner | - |
dc.contributor.author | Esch, Hendrik | - |
dc.date.accessioned | 2015-01-16T15:14:01Z | - |
dc.date.available | 2015-01-16T15:14:01Z | - |
dc.date.issued | 2015-01 | - |
dc.identifier.uri | http://hdl.handle.net/2003/33811 | - |
dc.identifier.uri | http://dx.doi.org/10.17877/DE290R-6947 | - |
dc.description.abstract | In 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.language.iso | en | de |
dc.subject | ATLAS | de |
dc.subject | CERN | de |
dc.subject | LHC | de |
dc.subject | B-tagging | en |
dc.subject | Particle physics | en |
dc.subject | Top quark | en |
dc.subject | Top quark mass | en |
dc.subject | Flavour tagging | en |
dc.subject | Neural network | en |
dc.subject | Single top quark production | en |
dc.subject | T-channel | en |
dc.subject.ddc | 530 | - |
dc.title | 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 | en |
dc.type | Text | de |
dc.contributor.referee | Wagner, Wolfgang | - |
dc.date.accepted | 2014-10-24 | - |
dc.type.publicationtype | doctoralThesis | en |
dc.subject.rswk | ATLAS <Teilchendetektor> | de |
dc.subject.rswk | LHC | de |
dc.subject.rswk | t-Quark | de |
dc.subject.rswk | Luminosität <Elementarteilchenphysik> | de |
dc.subject.rswk | Zerfall | de |
dc.subject.rswk | Lepton | de |
dcterms.accessRights | open access | - |
Appears in Collections: | Experimentelle Physik IV |
Files in This Item:
File | Description | Size | Format | |
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Dissertation.pdf | DNB | 28.66 MB | Adobe PDF | View/Open |
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