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@MASTERSTHESIS{ArrancaMenezesTrigueirosdaSilva:619472,
      author       = {Arranca Menezes Trigueiros da Silva, André Filipe},
      othercontributors = {List, Jenny and Gonçalo, Ricardo and Veloso, Filipe},
      title        = {{E}vent {S}election and {A}ngular {R}econstruction for {W}
                      {B}oson {E}vents at {F}uture $e^+e^-$ {C}olliders},
      school       = {University of Coimbra},
      type         = {Masterarbeit},
      reportid     = {PUBDB-2024-07665},
      pages        = {79},
      year         = {2024},
      note         = {Masterarbeit, University of Coimbra, 2024},
      abstract     = {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
                      $97.8\%$ for the hadronic, $77.6\%$ for single-W , $76.2\%$
                      for semi-leptonic electron, $92.5\%$ for semi-leptonic muon,
                      $62.1\%$ for semi-leptonic tau , and $98.2\%$ for the
                      leptonic channel. Finally, we do a direct comparison to the
                      angular distributions measured at the Large
                      Electron-Positron Collider (LEP) for the qqµν channel. The
                      work of this thesis is in natural units (c = e = ℏ = 1).},
      cin          = {ILC},
      cid          = {I:(DE-H253)ILC-20130206},
      pnm          = {621 - Accelerator Research and Development (POF4-621)},
      pid          = {G:(DE-HGF)POF4-621},
      experiment   = {EXP:(DE-H253)ILC(machine)-20150101},
      typ          = {PUB:(DE-HGF)19},
      url          = {https://bib-pubdb1.desy.de/record/619472},
}