| Title▼ | Belle II Number▼ | Tags | Submit date▼ | Downloads |
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Improved Selective Background Monte Carlo Simulation at Belle II with Graph Attention Networks and Weighted EventsPublic
When measuring rare processes such as B → K(∗)νν¯ or B → lνγ, a huge luminosity is required, which means a large number of simulations are necessary to determine signal efficiencies and background contributions. However, this process demands high computation costs while most of the simulated data, in particular in case of background, are discarded… |
BELLE2-MTHESIS-2022-017 | - | 2021-11-11 |
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First Conceptual Design and Studies for a Tracking Time Projection Chamber for the Belle II ExperimentPublic
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. The tracker for the \Btwo experiment, the Central Drift Chamber (CDC), suffers from high occupancy due to large beam backgrounds. While at the current luminosity of the SuperKE… |
BELLE2-MTHESIS-2021-073 | - | 2021-11-11 |
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Study of the time-dependent CP violation at the Belle II experimentPublic
This thesis is devoted to studies of the proper decay-time resolution function and particle decay vertex reconstruction tools, their applicability and role in the studies of time-dependent CP violation at the Belle II experiment. A positive effect of beam spot constraints and new beam spot calibration on the vertex reconstruction precision is see… |
BELLE2-MTHESIS-2023-008 | - | 2021-11-11 |
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Firmware Implementations for the Upgrade of the Data Acquisition System of the Belle II Pixel DetectorPublic
Parts of the ONSEN system firmware ("merger carrier" firmware), integrated in the present PXD readout, have been upgraded to a new FPGA platform, namely Kintex UltraScale 060. The firmware can be used on a new generation of xTCA carrier boards. The modifications include new link protocols (AXI stream) and a MicroBlaze softcore CPU replacing the Po… |
BELLE2-MTHESIS-2021-080 | - | 2021-11-11 |
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Background Analysis for $B^0$ Lifetime and Oscillation Frequency Measurement using Hadronic $B^0\rightarrow D^{(*)-}\pi^+$ Channels at Belle IIPublic
To explain the origin of the observed matter-antimatter asymmetry in the universe, new sources of charge-parity (CP) symmetry violation beyond the standard model of particle physics are required. The oscillation frequency $\Delta m$ in the neutral B meson system is an important parameter in overconstraining standard model predictions for CP violat… |
BELLE2-MTHESIS-2021-076 | - | 2021-11-11 |
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Investigation of B → µ ν_µ with Inclusive Tagging at Belle IIPublic
In this thesis the rare $B \to \mu \nu_{\mu}$ decay was investigated using the inclusive tagging approach. The reconstruction of the tag side $B$ meson kinematics is deteriorated by multiple factors, which were investigated by studying the different reconstruction errors. Measures were employed to improve the reconstruction, but many reconstructio… |
BELLE2-MTHESIS-2021-074 | - | 2021-11-11 |
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Neural Network based Pulse Shape Analysis with the Belle II Electromagnetic CalorimeterPublic
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. The pulse shapes from the particle-dependent scintillation response are nominally analysed with a multi-template off… |
BELLE2-MTHESIS-2021-072 | - | 2021-11-11 |
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A Study of Dark Matter at Electron-Positron Colliders using High Performance ComputingPublic
Even if the Standard Model (SM) describing particles that constitutes the universe and its interactions is well established, the SM cannot explain dark matter. Therefore, little is known about dark matter and is being explored by various means. In this thesis, we study dark matter at electron-positron collider experiments using tool kits utilized … |
BELLE2-MTHESIS-2021-067 | - | 2021-11-11 |
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Search for dark sector physics and performance of the Belle II detector in final state events with muons and large missing energy Public
This thesis presents two different searches for dark sector mediators in final state events consisting of a pair of muons and large missing energy. Both searches are performed using data collected at the Belle II experiment which is located at the SuperKEKB $e^+e^-$-accelerator in Tsukuba, Japan. A first analysis is looking for the simultaneous pr… |
BELLE2-PTHESIS-2022-001 | - | 2021-11-11 |
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Claws An Injection Background Monitoring System for the Second and Third Phase of the SuperKEKB CommissioningPublic
The Belle 2 experiment is a collider-based high energy physics experiment at the intensity and precision frontier and is based at the only collision point of the SuperKEKB collider located at the KEK research institute in Tsukuba, Japan. The B-factory circulates electrons and positrons at asymmetric beam energies of 7 GeV and 4 GeV, respectively, … |
BELLE2-PTHESIS-2024-010 | - | 2021-11-11 |
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Performance study of the SVD detector of Belle II and future upgradesPublic
SuperKEKB is a B factory: an asymmetric e+e- collider designed to operate at a centre-of-mass energy of 10.58 GeV, corresponding to the peak of the Y(4S) vector meson resonance, which decays to a BBbar pair over 96% of the times. The asymmetry between the beam energies (7 GeV for e-, 4 GeV for e+) results in a boosted centre of mass in the laborat… |
BELLE2-MTHESIS-2021-078 | - | 2021-11-11 |
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Sensitivity Study of $B^{+}\rightarrow \mu^{+}\nu$ in the Belle II ExperimentPublic
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. The Monte Carlo method is applied to generate a large amount of dat… |
BELLE2-MTHESIS-2021-068 | - | 2021-11-11 |
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A study on CP violation in the 𝐷0 → 𝜋+𝜋− and 𝐷0 → 𝐾+𝐾− decay channels using the Belle II experiment and a detailed research on the 𝐷∗+ → 𝐷0𝜋+ decays to develop a related analysis software toolPublic
The Belle II experiment started its physics run in 2019 and has accumulated more than 213.49/fb heretofore, and aims to accumulate more than 50/ab until the end of the experiment. Based on the latest BelleII Monte Carlo simulation dataset, this thesis delve into the strategy to search for CP violation effect in the 𝐷0 → 𝜋+𝜋− and 𝐷0 → 𝐾+𝐾− channels… |
BELLE2-MTHESIS-2022-009 | - | 2021-11-11 |
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Analysis of the B+ → K+π+π−γ decay with early Belle II dataPublic
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. The aim of the present work is to pave the way leading to the measurement of the polarization of the photon γ involved in t… |
BELLE2-PTHESIS-2022-003 | - | 2021-11-11 |
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Fast Simulation and Validation of the Time of Propagation Detector at the Belle II ExperimentPublic
The generation of Monte Carlo data is very time- and resource-consuming, which will only increase with higher luminosities of the particle physics experiments. The Time of Propagation detector at the Belle II experiment is the current bottleneck regarding simulation time. This thesis is exploring the concept of replacing the TOP simulation with a … |
BELLE2-MTHESIS-2023-019 | - | 2021-11-11 |
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Trouver le méson B d’origine à l’aide d’un réseau de neurones à graphes à Belle IIPublic
To find new physics beyond Standard Model, the Belle II experiment performs precision measurements to bring to light deviations between theory and experimental data. SuperKEKB collider, located in Tsukuba in Japan, collides electron and positron beams with the energies 7 GeV and 4 GeV. The annihilation of an electron and a positron produces the Υ(… |
BELLE2-MTHESIS-2022-002 | - | 2021-11-11 |
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Laboratory and Simulation studies of Pulse Shape Discrimination in pure CsI and CsI(Tl)Public
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. Experiments such as Belle II target higher luminosities to push the precision frontier. This requires stable detector performance and reliable identification of par… |
BELLE2-MTHESIS-2022-007 | - | 2021-11-11 |
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Search for Axion-Like Particles produced in e+e− collisions and photon energy resolution studies at Belle IIPublic
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. Amongst these is Dark Matter (DM), a kind of matter that would permeate the whole Universe and that so far has been observed only via its gravitationa… |
BELLE2-PTHESIS-2022-004 | - | 2021-11-11 |
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MC study to obtain reconstruction efficiencies to measure branching fraction of D+ -> K+ pi0 modePublic
Measuring the branching fraction of the D meson rare decay is important for validating the theoretical calculations of the standard model. The goal of this thesis is to obtain reconstruction efficiencies that required to measuring the branching fraction of D+ → K+ pi0 mode. The modes are D+ → K+ pi0 as a signal mode, D+ → K- pi0 pi0 as a reference… |
BELLE2-UTHESIS-2021-001 | - | 2021-11-11 |
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Sensitivity study of the charged lepton flavour violating mode B+ to K+ tau+ e- at Belle II.Public
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. In this thesis we outline our analysis searching for the ultra-rare charged lepton flavour violating (CLFV) decay B+ to K+ tau+ e-. This decay is far b… |
BELLE2-MTHESIS-2022-006 | - | 2021-11-11 |
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