Electroweak heavy flavour precision observables: connecting open dots with the FCC-ee
| dc.contributor.advisor | Kröninger, Kevin | |
| dc.contributor.author | Röhrig, Lars | |
| dc.contributor.referee | Simon, Frank | |
| dc.contributor.referee | Emmanuel, Perez | |
| dc.date.accepted | 2024-10-30 | |
| dc.date.accessioned | 2024-12-11T08:45:30Z | |
| dc.date.available | 2024-12-11T08:45:30Z | |
| dc.date.issued | 2024 | |
| dc.description.abstract | The heaviest third-generation fermions are expected to be most sensitive to effects from Beyond the Standard Model (BSM) physics, which will be probed with very high precision at a possible FCC-ee. In this thesis, a novel approach to measuring Electroweak Precision Observables in the beauty-quark sector is pioneered using exclusively reconstructed beauty-hadrons as hemisphere-flavour taggers for the partial decay-width ratio Rb and the forward-backward asymmetry AFBb, which receive virtual contributions from the heaviest states of the Standard Model (SM): top quarks, Higgs, and W± boson. This approach effectively eliminates the contamination from light-quark physics events and reduces leading systematic uncertainties; arising from background contamination, tagging-efficiency correlations, and radiated gluon corrections by exploiting the geometric and kinematic properties of beauty hadrons. This results in a total relative uncertainty of the order of 0.01 % for both observables. From AFBb, the weak mixing angle can be determined with a relative precision of 0.002 %. Building on this innovative methodology, the thesis is extended to the top-quark sector by extracting the sensitivity of top-quark observables to SM Effective Field Theory operators, which describe the effects of BSM physics by extending the SM with higher-dimensional operators on energy scales that are currently inaccessible. In a FCC-ee environment, top-quark pairs are reconstructed, and the expected observational precision is used to derive constraints on the Wilson coefficients that are up to a factor of five and three more stringent than those derived from top-quark measurements at LHC and HL-LHC, respectively. | en |
| dc.identifier.uri | http://hdl.handle.net/2003/43276 | |
| dc.identifier.uri | http://dx.doi.org/10.17877/DE290R-25108 | |
| dc.language.iso | en | |
| dc.subject | FCC-ee | en |
| dc.subject | Heavy flavours | en |
| dc.subject | Electroweak precision observables | en |
| dc.subject.ddc | 530 | |
| dc.title | Electroweak heavy flavour precision observables: connecting open dots with the FCC-ee | en |
| dc.type | Text | |
| dc.type.publicationtype | PhDThesis | |
| dcterms.accessRights | open access | |
| eldorado.secondarypublication | false |