2021-09-0213:30 Tagged Analysis of $B^0\to\pi^-\ell^+\nu_\ell$ at Belle / Jonathan Wolfgang Grumke ; Jochen Dingfelder ; Peter Lewis [BELLE2-MTHESIS-2021-075] Presented on 25 08 2021 MSc 2021 Physikalisches Institut / Bonn Using the FEI algorithm with simulated data for hadronic tagging in the reconstruction of $B^0\to\pi^-\ell^+\nu_\ell$ results in a signal yield of $626\pm 39$ when applying the same selections as Sibidanov et al., who used the FR algorithm and obtained a signal yield of $463\pm 28$. [...] Fulltext: PDF; 2021-09-0213:19 Investigation of B → µ ν_µ with Inclusive Tagging at Belle II / Daniel Jacobi ; Prof. Dr. Jochen Dingfelder ; Dr. Peter Lewis ; Svenja Katharina Granderath [BELLE2-MTHESIS-2021-074] Presented on 25 08 2021 MSc 2021 Physikalisches Institut / Bonn In this thesis the rare $B \to \mu \nu_{\mu}$ decay was investigated using the inclusive tagging approach. [...] Fulltext: PDF; 2021-09-0207:05 First Conceptual Design and Studies for a Tracking Time Projection Chamber for the Belle II Experiment / Andreas Löschcke Centeno ; Jochen Dingfelder ; Peter Lewis [BELLE2-MTHESIS-2021-073] Presented on 30 08 2021 MSc 2021 Physikalisches Institut / Bonn This thesis deals with simulating a tracking time projection chamber (TPC) for the \Btwo experiment at the SuperKEKB accelerator and using the simulation for first studies. [...] Fulltext: PDF; 2021-08-2016:01 Searches for an invisible Z' and for the dark Higgsstrahlung A'h' process in μ⁺μ⁻ plus missing energy final states at Belle II / Marcello Campajola ; Guglielmo De Nardo ; Francesco Di Capua [BELLE2-PTHESIS-2021-016] Presented on 24 06 2021 PhD 2021 Università di Napoli "Federico II" / Napoli (IT) The work presented in this thesis concerns two searches for dark sector mediators in \emep\ annihilations at the center-of-mass energy of 10.58~GeV with the Belle II experiment [...] 2021-08-0911:48 Real-Time Trigger and online Data Reduction based on Machine Learning Methods for Particle Detector Technology / Steffen Baehr ; Juergen Becker [BELLE2-PTHESIS-2021-015] Presented on 16 07 2020 PhD 2020 KIT / Karlsruhe Modern particle accelerator experiments are producing immense amounts of data online during their operation. [...] Fulltext: PDF; 2021-07-2013:12 Neural Network based Pulse Shape Analysis with the Belle II Electromagnetic Calorimeter / Stella Katharina Wermuth ; Dr. Torben Ferber ; Prof. Dr. Oliver Gerberding [BELLE2-MTHESIS-2021-072] Presented on 22 06 2021 MSc 2021 DESY / Hamburg The Belle II experiment, located at the SuperKEKB e+e- collider in Japan, uses pulse shape analysis techniques to distinguish electromagnetically and hadronically interacting particles within the CsI(Tl) electromagnetic calorimeter. [...] Fulltext: PDF; 2021-07-1911:21 Search for lepton flavour violating B meson decays at the Belle experiment / Mateusz Kaleta ; Andrzej Bożek [BELLE2-MTHESIS-2021-071] Presented on 26 01 2021 MSc 2021 - / - The work of the thesis is concerned about searching for Lepton Flavour Violating B meson decays, B+ →K+τ±μ∓, in the experimental environment of the Belle experiment. [...] Fulltext: PDF; 2021-07-1316:08 Study of 𝐵 → 𝜋^−ℓ^+𝜈_ℓ Decays Using Fully Reconstructed ϒ(4𝑆) → 𝐵 \bar 𝐵 Events at the Belle II Experiment / Yaroslav Kulii ; Thomas Kuhr [BELLE2-MTHESIS-2021-070] Presented on 15 09 2020 MSc 2020 Ludwig Maximilian University / Munich We present the results of a study of exclusively reconstructed 𝐵 → 𝜋^−ℓ^+𝜈_ℓ decays, where ℓ is an electron or a muon. [...] Fulltext: PDF; 2021-07-0212:25 Construction of Angular Observables Sensitive to New Physics in $\bar B\to D^*\tau^-\bar \nu_\tau$ Decays and Measurements of Differential Cross Sections of $\bar B\to D^*\ell^-\bar\nu_\ell$ Decays with Hadronic Tagging at Belle / Kilian Lieret ; Thomas Kuhr ; Martin Jung ; Gerhard Buchalla [BELLE2-MTHESIS-2021-069] Presented on 16 09 2018 MSc 2018 Ludwig Maximilian University of Munich / Munich Recent measurements of $\bar B\to D^{(*)}\ell^-\bar\nu_\ell$ cross sections at Belle, BaBar, and LHCb challenge lepton universality and thus the Standard Model at a combined confidence level close to four standard deviations. [...] 2021-07-0203:02 Sensitivity Study of $B^{+}\rightarrow \mu^{+}\nu$ in the Belle II Experiment / Yen-Ting Chin ; Pao-Ti Chang [BELLE2-MTHESIS-2021-068] Presented on 25 01 2021 MSc 2021 National Taiwan University / Taipei, Taiwan In this study, we intend to estimate the statistical significance of $B^{+}\rightarrow \mu^{+}\nu$ when various amounts of Belle II data are available in the future, assuming that the Standard Model estimation of the branching fraction of $B^{+}\rightarrow \mu^{+}\nu$ is correct. [...] Fulltext: PDF;