2022-04-1718:01 Laboratory and Simulation studies of Pulse Shape Discrimination in pure CsI and CsI(Tl) / Munira Khan ; Torben Ferber ; Kerstin Tackmann [BELLE2-MTHESIS-2022-007] Presented on 11 11 2021 MSc 2021 DESY / Hamburg In the search for physics beyond the Standard Model, research in particle physics aims to probe particle interactions at high energies and strives for better precision on measurements [...] Fulltext: PDF; 2022-04-0700:08 Search for Axion-Like Particles produced in e+e− collisions and photon energy resolution studies at Belle II / Michael De Nuccio ; Torben Ferber [BELLE2-PTHESIS-2022-004] Presented on 19 10 2021 PhD 2021 DESY / Hamburg Despite the great successes achieved by the Standard Model (SM) in explaining and predicting the behavior and existence of particles, multiple phenomena are yet to be given a satisfying explanation. [...] Fulltext: PDF; 2022-04-0616:42 Analysis of the B+ → K+π+π−γ decay with early Belle II data / Borys KNYSH ; Francois LE DIBERDER [BELLE2-PTHESIS-2022-003] Presented on 07 10 2021 PhD 2021 IJCLab / Orsay Abstract: The document presents the analysis of the decay of the B+ meson into the K+π+π−γ final state using the early data of the Belle II exper- iment, that is located at the SuperKEKB collider in the KEK laboratory, Japan. [...] Fulltext: PDF; 2022-04-0610:30 Measurement of CKM angle $\boldsymbol {\phi_3}$ from $\boldsymbol {B^\pm \to D(K_S^{0}h^-h^+)h^\pm}$ decays at Belle and Belle~II / Niharika Rout ; Jim Libby [BELLE2-PTHESIS-2022-002] Presented on 04 04 2016 PhD 2016 IIT Madras / Chennai The thesis reports the measurement of the CKM unitarity triangle angle $\phi_{3}$ using a model-independent Dalitz plot analysis of $B^{\pm} \to D(K_{S}^{0}h^{+}h^{-})K^{\pm}$ ($h = \pi$ or $K$) decays, where $D$ can either be a $D^0$ or a $\bar{D^0}$, which currently provides the best sensitivity [...] Fulltext: PDF; 2022-04-0408:09 Identification of slow pions by Support Vector Machines: Identifizierung von langsamen Pionen durch Support Vector Machines / Timo Schellhaas ; Jens Sören Lange [BELLE2-UTHESIS-2022-001] Presented on 28 03 2022 BSc 2022 II. Institute of Physics / Giessen Slow pions are classified based upon a pattern recognition algorithm using 9x9 pixel matrices in the PXD as input pattern [...] Fulltext: PDF; 2022-03-3120:40 Search for dark sector physics and performance of the Belle II detector in final state events with muons and large missing energy / Michel Bertemes ; Gianluca Inguglia ; Christoph Schwanda [BELLE2-PTHESIS-2022-001] Presented on 20 10 2021 PhD 2021 Institut für Hochenergiephysik (HEPHY) / Vienna This thesis presents two different searches for dark sector mediators in final state events consisting of a pair of muons and large missing energy. [...] Fulltext: PDF; 2022-03-3016:28 Sensitivity study of the charged lepton flavour violating mode B+ to K+ tau+ e- at Belle II. / Trevor Shillington ; Steven Robertson [BELLE2-MTHESIS-2022-006] Presented on 01 10 2021 MSc 2021 McGill University / Montreal, QC Belle II is a B factory experiment for the SuperKEKB electron-positron collider located at the KEK laboratory in Tsukuba, Japan, operating near the Upsilon(4S) resonance, at an energy of 10.58 GeV. [...] Fulltext: PDF; 2022-03-2412:36 Study of charmless B → η′K decays with the Belle II experiment / Valeria Fioroni ; Stefano Lacaprara [BELLE2-MTHESIS-2022-005] Presented on 13 12 2021 MSc 2021 Dipartimento di Fisica e Astronomia “Galileo Galilei” / Padova The study of penguin-dominated B0 → η′K0S decays provides a good test of the Standard Model, since the CP violation measurement in this mode is sensitive to the presence of new physics effects in the loop. [...] Fulltext: PDF; 2022-03-2016:25 Development of a Semi-Inclusive Tagging Algorithm and Implementation of a Continuum Suppression in the Full Event Interpretation for the Belle II Experiment / Gianna Mönig [BELLE2-MTHESIS-2022-004] Presented on 31 08 2021 MSc 2021 Physikalisches Institut Bonn / Bonn In this thesis a novel hybrid approach to tag-side reconstruction is presented, where the tag-side is only partially reconstructed in order to improve the purity compared to the inclusive tagging, while retaining a high efficiency. [...] Fulltext: PDF; 2022-02-0316:58 SEARCH FOR B → K (∗) ν ν̄ DECAYS IN BELLE II / Lucas MARTEL ; Isabelle RIPP-BAUDOT ; Giulio DUJANY [BELLE2-MTHESIS-2022-003] Presented on 18 06 2020 MSc 2020 Universite de Strasbourg / Strasbourg, France The B → K (∗) ν ν̄ decay channel, never discovered to this day, is actively sought for in the Belle II experiment. [...] Fulltext: PDF;