2024-11-03
09:10 |
Implementation, Operation and Monitoring of the Data Acquisition System of the Belle II Pixel Detector during Physics Data Taking in 2019 — 2022
/ Simon Reiter ; Sören Lange ; Claudia Höhne
[BELLE2-PTHESIS-2024-021]
Presented on 15 02 2024 PhD
2024
II. Physikalisches Institut
/ Giessen
This paper summarizes my contribution to the real-time data taking of the pixel detector of the Belle II experiment at the High Energy Accelerator Research Organization (KEK) in Tsukuba, Japan. [...]
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2024-10-23
12:49 |
Dalitz Plot Analysis of B0 → K+ π− π0 Decays at the Belle II Experiment
/ Markus Reif ; Thomas Kuhr ; Hans-Guenther Moser
[BELLE2-PTHESIS-2024-020]
Presented on 26 09 2024 PhD
2024
Max Planck Institute for Physics
/ Garching
This thesis reports a determination of the branching fraction (B) and CP-violating charge asymmetry (ACP ) of the three-body decay B0 → K+ π− π0 at the Belle II experiment. [...]
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2024-10-22
16:27 |
Study of the B0->D*-l+vl decay at Belle II for a new measurement of the decay dynamics and |Vcb|
/ Matteo Filipig ; Mirco Dorigo ; Michele Mantovano
[BELLE2-UTHESIS-2024-004]
Presented on 18 10 2024 MSc
2024
University of Trieste
/ Trieste
This is an experimental particle physics thesis that aims to study the exclusive semileptonic decay B0 → D∗−l+νl at Belle II for a new measurement of its decay dynamics and |Vcb|. [...]
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2024-10-22
14:02 |
Study of the reconstruction efficiency of π0 mesons from decays of the lepton τ at the Belle II experiment
/ Ermes Aviano ; Diego Tonelli ; Benigno Gobbo ; Sebastiano Raiz
[BELLE2-MTHESIS-2024-022]
Presented on 18 10 2024 MSc
2024
Università degli Studi di Trieste
/ Trieste
This experimental particle-physics thesis explores a novel approach to the determination of the π0 meson reconstruction efficiency, whose uncertainty is a significant limitation in measurements sensitive to beyond Standard Model physics. [...]
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2024-10-22
04:50 |
Search for lepton flavor universality violation in $\overline{B} \rightarrow D^{*}\tau^{-}\overline{\nu}_{\tau}$ decays using hadronic $B$ tagging at the Belle II experiment
/ Kazuki Kojima ; Toru Iijima
[BELLE2-PTHESIS-2024-019]
Presented on 25 03 2024 PhD
2024
Nagoya University
/ Nagoya
In the standard model of particle physics (SM), lepton flavor universality is an axiom that states that the coupling constants in the interaction between leptons and gauge particles are the same regardless of the lepton flavor $e$, $\mu$, or $\tau$. [...]
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2024-09-24
09:59 |
Measurement of the properties of B0 → π0π0 decays at Belle II
/ Sebastiano Raiz ; Diego Tonelli
[BELLE2-PTHESIS-2024-018]
Presented on 17 05 2024 PhD
2024
University Of Trieste
/ Trieste
This experimental particle-physics thesis reports measurements of the branching fraction and charge-parity (CP) violating decay-rate asymmetry of B0 → π0π0 decays reconstructed in electron-positron collisions with the Belle II detector. [...]
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2024-09-19
09:11 |
Study of sPlot Background Subtraction for Particle Identification Efficiency Determination at Belle II
/ Lars von der Werth ; Stefan Wallner
[BELLE2-UTHESIS-2024-003]
Presented on 29 10 2024 BSc
2024
Max Planck Institut for Physics
/ Garching
Particle identification is a central experimental challenge in the precise measurement of Standard Model parameters and in the search for new physics beyond the standard model at the Belle II experiment. [...]
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2024-09-08
13:16 |
Tests of lepton universality in the rates of inclusive semileptonic B-meson decays at Belle II
/ Henrik Junkerkalefeld ; Jochen Dingfelder ; Peter Lewis ; Florian Bernlochner
[BELLE2-PTHESIS-2024-017]
Presented on 28 06 2024 PhD
2024
Physikalisches Institut
/ Bonn
This thesis presents two precision tests of lepton universality: the first measurement of the ratio of light-lepton branching fractions of inclusive semileptonic $B$-meson decays, $R(X_{e/mu}) = \mathcal{B}(B \to Xe\nu) / \mathcal{B}(B \to X\mu\nu)$, and the first successful measurement of inclusive $B \to X\tau\nu$ decays, measured in a ratio relative to $B \to X\ell\nu$ decays ($\ell = e, \mu$), $R(X_{\tau/\ell}) = \mathcal{B}(B \to X\tau\nu) / \mathcal{B}(B \to X\ell\nu)$. [...]
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2024-09-05
10:09 |
Search for B+ -> K+ nu nubar at Belle II using Graph Neural Networks
/ Merna Abumusabh ; Giulio DUJANY ; Jacopo CERASOLI
[BELLE2-MTHESIS-2024-021]
Presented on 19 06 2024 MSc
2024
IPHC
/ Strasbourg
This work presents the search for the decay of a charged B-meson into a charged kaon and a pair of neutrinos via graph-tagged analysis, which is an approach based on graph neural network, in Belle~II, which is operating at the asymmetric electron-positron collider SuperKEKB located at KEK, Tsukuba, Japan. [...]
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2024-09-03
10:37 |
Implementing the TabNet Deep Learning Algorithm for Selecting τ−→π−π−π+ντ Events from Belle II Data
/ Yannik Fausch
[BELLE2-UTHESIS-2024-002]
Presented on 29 10 2024 BSc
2024
Max Planck Institut for Physics
/ Garching
This thesis aims to compare TabNet, a Deep Learning (DL) algorithm for classi- fication of tabular data, to the established Boosted Decision Tree (BDT) used for event selection of the τ − → π−π−π+ντ decay. [...]
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