| dc.contributor.advisor | Lai, Stan Prof. Dr. | |
| dc.contributor.author | Ördek, Serhat | |
| dc.date.accessioned | 2021-02-15T10:03:48Z | |
| dc.date.available | 2021-02-15T10:03:48Z | |
| dc.date.issued | 2021-02-15 | |
| dc.identifier.uri | http://hdl.handle.net/21.11130/00-1735-0000-0005-156E-9 | |
| dc.identifier.uri | http://dx.doi.org/10.53846/goediss-8436 | |
| dc.identifier.uri | http://dx.doi.org/10.53846/goediss-8436 | |
| dc.language.iso | eng | de |
| dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/ | |
| dc.subject.ddc | 530 | de |
| dc.title | Investigation of the CP properties of VBF Higgs production in hadronic final states of H → τ τ decays with the ATLAS detector | de |
| dc.type | doctoralThesis | de |
| dc.contributor.referee | Lai, Stan Prof. Dr. | |
| dc.date.examination | 2021-01-28 | |
| dc.subject.gok | Physik (PPN621336750) | de |
| dc.description.abstracteng | A test of CP invariance of the VBF Higgs production process is presented in the τ τ
final state. For this, a profile likelihood fit using a matrix-element observable method is
employed to test whether a CP-odd component is present in the coupling. The analysis
is carried out using 36.1 fb −1 of proton-proton collision data recorded at a centre-of-
mass energy of 13 TeV with the ATLAS detector at the LHC. It constrains the value
of the CP violation inducing parameter d ̃ to [−0.090, 0.035] at the 68% confidence level.
This result is compatible with the Standard Model expectation of d ̃ = 0 and no CP
violation. Particular emphasis is put on the final state including two hadronically-
decaying τ leptons.
Additionally, a measurement of the efficiencies of τ -lepton triggers is presented. These
triggers are necessary to collect the data on which the measurement of d ̃ is based. Lastly,
an ongoing measurement of Higgs-boson production cross-sections in the τ τ final state
using 139 fb −1 of data is discussed, including an improved method of estimating back-
ground contributions in the final state with two hadronically-decaying τ leptons. | de |
| dc.contributor.coReferee | Quadt, Arnulf Prof. Dr. | |
| dc.subject.eng | Higgs boson | de |
| dc.subject.eng | CP violation | de |
| dc.identifier.urn | urn:nbn:de:gbv:7-21.11130/00-1735-0000-0005-156E-9-2 | |
| dc.affiliation.institute | Fakultät für Physik | de |
| dc.identifier.ppn | 1748349198 | |