TY  - THES
AU  - Arranca Menezes Trigueiros da Silva, André Filipe
TI  - Event Selection and Angular Reconstruction for W Boson Events at Future e<sup>+</sup>e<sup>−</sup> Colliders
PB  - University of Coimbra
VL  - Masterarbeit
M1  - PUBDB-2024-07665
SP  - 79
PY  - 2024
N1  - Masterarbeit, University of Coimbra, 2024
AB  - The international particle physics community has identified an e+e− Higgs factory as the highest-priority next collider. Such a facility would enable the production of a substantial number ofW bosons. For instance, the ILC would produce 1.2 × 108 W bosons at 250 and 500 GeV, while the FCC program offers similar production rates at 160 and 240 GeV. The production processescomprise W -pair production and single-W production. Both are sensitive to beam polarisation and suited to scrutinize self-couplings of the gauge bosons in the electroweak sector. The measurements of these couplings are a validity test of the Standard Model (SM) with unprecedented precision due to the nature of electron-positron collisions. In addition, the hadronic decays of Wbosons probe elements of the CKM matrix. The goal is to reconstruct the W boson properties through its decay modes. These events correspond to a four fermions final state, being classifiedas semi-leptonic qqℓν, hadronic qqqq, or leptonic ℓνℓν. The work of this thesis consists of building a algorithm capable of a generic categorisation for W boson events and to defineoverlap-free pre-selections for all channels. This event selection will be of use for several analyses on the W decays. This work is based on mini-DST, the lighter successor of the Data Storage Technique (DST) data formats using a full Geant4 based simulation of the International Large Detector (ILD). The categorisation performance is evaluated by a confusion matrix and in each bin we give an efficiency (fraction of events desired). The diagonal of this matrix represents correctly categorised events, based on their Monte-Carlo (MC) truth, for which, after generic channel cuts on event observables, primary lepton correction and reducing beam-induced background, we achieve a final efficiency of 97.8
LB  - PUB:(DE-HGF)19
UR  - https://bib-pubdb1.desy.de/record/619472
ER  -