| Title▼ | Belle II Number▼ | Tags | Submit date▼ | Downloads |
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Radiative B decays at Belle and Belle IIPublic
Radiative B decays at Belle and Belle II. |
BELLE2-TALK-CONF-2022-008 | - | 2021-11-22 |
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Semi-leptonic decays with tau at Belle II Public
Prospects of semi-leptonic decays with taus are discussed in this talk, with a focus on R(D) and R(D*), $B \rightarrow X\tau \nu$, and $\B \rightarrow \tau \nu $. Developments in the Belle II software and analysis chain relevant to these measurements are also mentioned. |
BELLE2-TALK-CONF-2021-135 | - | 2021-11-17 |
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Measurement of the inclusive semileptonic B meson branching fraction in 62.8/fb of Belle II dataPublic
We report a measurement of the branching fraction of inclusive semileptonic B meson decays B -> Xc l nu in Υ(4S) -> BBbar data recorded by the Belle II experiment at the SuperKEKB asymmetric-energy e+e- collider and corresponding to 62.8/fb of integrated luminosity. Only a charged lepton (electon or muon) is reconstructed and the signal yield is d… |
BELLE2-CONF-PH-2021-012 | - | 2021-11-17 |
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Search for the Rare Decay $B^+ \to \ell^+ \nu_\ell \gamma$ with the Full Event Interpretation at the Belle II ExperimentPublic
See thesis |
BELLE2-MTHESIS-2023-029 | - | 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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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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Measurement of the pion transition form factor in the single-tag one-pion production process e+e--> e (e) pi^0.Public
This thesis reports the results of the feasibility study of the one-pion production in the single-tag two-photon processes in the e+e- collisions at Belle II. Analysis of the selection criteria and trigger effects has been carried out with MCs as well as a small amount (10 fb^-1) of the data. |
BELLE2-MTHESIS-2022-015 | - | 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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Search for lepton flavour violating B meson decays at the Belle experimentPublic
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. These processes are extremely suppressed in Standard Model interactions and have predicted decay rates many orders of magnitude below the experimental sensitivity of today’s and futur… |
BELLE2-MTHESIS-2021-071 | - | 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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Ecient Physics Signal Selectors for the First Trigger Level of the Belle II Experiment based on Machine LearningPublic
A neural network based z-vertex trigger is developed for the first level trigger of the upgraded flavor physics experiment Belle II at the high luminosity B factory SuperKEKB in Tsukuba, Japan. Using the hit and drift time information from the central drift chamber, a pool of expert neural networks estimates the 3D track parameters of the single t… |
BELLE2-PTHESIS-2023-015 | - | 2021-11-11 |
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Analysis on the Lepton Flavor Violating Decay τ -> μ π0 in Belle IIPublic
This work focuses on the lepton flavor violating decay τ → μπ0 with the goal to explore the prospects of finding New Physics in this particular channel. Belle and BaBar found the upper limit for the branching ratio of this decay to be (τ → μπ0)/tot < 2.7 · 10−8 while having an available luminosity of Lint = 901 fb−1. In the analysis, the decay s… |
BELLE2-MTHESIS-2023-036 | - | 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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The study of B0 to J/ψ eta in Belle II Experiment at KEKPublic
We study the decay of 𝐵0 → 𝐽⁄𝜓 eta based on the Belle data samples at the Υ(4𝑆) resonance and compare to the results in PRL 2007 “Observation of the Decay 𝐵0 → 𝐽⁄𝜓 eta ” and PRD 2012 “Measurement of 𝐵0 → 𝐽⁄𝜓 eta(′) and constraint on the eta − eta′ mixing angle”. The branching fraction is (9.5 ± 1.7 ± 0.8) × 10^−6, and the significance is 8.1 𝜎 in … |
BELLE2-MTHESIS-2023-026 | - | 2021-11-11 |
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Search for invisible decays of dark photon at Belle IIPublic
The Standard Model of particle physics displays a good description of the nature of fundamental particles. However, there are some inconsistencies between theory and experimental evidence. One of the observations made through astronomy and cosmology but is not explained by the Standard Model is dark matter. Many theories have been made to explain … |
BELLE2-MTHESIS-2023-015 | - | 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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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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Noise Waveform Generation Using GANs and Charged Particle Identification Using Pulse Shape Discrimination in the Belle II Electromagnetic CalorimeterPublic
This thesis investigates the use of generative adversarial networks (GANs) as an alternative method to simulate noise waveforms for Belle II CsI(Tl) calorimeter crystals. Presented is a deep convolutional GAN (DCGAN) trained using background waveforms recorded in the ECL during a physics run. Results are presented showing good agreement in the dis… |
BELLE2-MTHESIS-2022-010 | - | 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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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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