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Spectrometer and Kinematic Studies for New Physics Searches in Rare $K^+ \to \pi^+ \nu \bar\nu$ Decay at NA62 Experiment at CERN

The main focus of the presented thesis is twofold: First the STRAW spectrometer single track reconstruction efficiency evaluation carried out with $K^+ \to \pi^+ \pi^0$, $K^+ \to \pi^0 \mu^+ \nu$ and $K^+ \to \pi^0 e^+ \nu$ samples on the full 2016-2018 NA62 data set as well as on simulated decays i...

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Detalles Bibliográficos
Autor principal: Kucerova, Zuzana
Lenguaje:eng
Publicado: 2021
Materias:
Acceso en línea:http://cds.cern.ch/record/2756376
Descripción
Sumario:The main focus of the presented thesis is twofold: First the STRAW spectrometer single track reconstruction efficiency evaluation carried out with $K^+ \to \pi^+ \pi^0$, $K^+ \to \pi^0 \mu^+ \nu$ and $K^+ \to \pi^0 e^+ \nu$ samples on the full 2016-2018 NA62 data set as well as on simulated decays is summarized. Secondly a new algorithm for matching kaon candidates with $\pi^+$ tracks based on likelihood hypothesis testing is proposed. Performance of the algorithm is studied with fully reconstructed $K^+ \to \pi^+ \pi^+ \pi^-$ event candidates and results of a part of the $K^+ \to \pi^+ \nu \overline{\nu}$ analysis with the new matching algorithm with the 2017 data sample are presented.