| Title▼ | Belle II Number▼ | Tags | Submit date▼ | Downloads |
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| Domain-Specific Language for Querying Particle PropertiesPublic | BELLE2-MTHESIS-2024-013 | - | 2022-11-11 |
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Search for an Invisible Boson in Tau Decays with Early Belle II Data and Development of New Analysis Methods for Tau PhysicsPublic
The Belle II experiment at SuperKEKB – an asymmetric e+e− collider – aims at a total integrated luminosity of 50 ab−1 to pursue a rich program of Standard Model and Beyond the Standard Model physics. Belle II collected about 427.79 fb−1 at the Υ (4S) resonance until the middle of 2021. This thesis presents a search for the hypothetical lepton-flav… |
BELLE2-PTHESIS-2024-009 | - | 2022-11-11 |
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Search for rare B to charm decays at Belle and sensitivity study for Phi3 at Belle IIPublic
The objective of this work is to search for the rare decay modes like B^{+} → D^{(∗)+}_{s}η, D^{(∗)+}_{s}K0, D^{+}η, and D^{+}K0 along with the branching fraction measurement of B^{0} → D^{0}η and ̄B^{0} → D^{0}K^{0} decay modes. To perform these studies, we used the data sample corresponding to an integrated luminosity of 711 fb^{−1} collected wi… |
BELLE2-PTHESIS-2023-007 | - | 2022-11-11 |
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Predicting injection backgrounds at SuperKEKB using neural networks.Public
Every process that has ever been observed in particle physics respects the conservation of baryon and lepton numbers. That means every time a particle is created or destroyed, a corresponding antiparticle is also created or destroyed at the same time. Following this principle, the difference between the number of particles and the number of antipa… |
BELLE2-UTHESIS-2022-002 | - | 2022-11-11 |
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Measuring the Weinberg Angle at the Belle II ExperimentPublic
The Weinberg angle is known precisely only at high energies around the Z0 mass. At Belle II, we have the opportunity to measure it at much lower energies via e+e− → μ+μ− as a process. A measurement could solve the issue of the deviation observed by the NuTeV experiment. I calculate the differential cross section for this process at tree-level to r… |
BELLE2-MTHESIS-2024-010 | - | 2022-11-11 |
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Optimizing the sensitivity to the 𝜏 → l 𝛾 decay with a novel tag approach at Belle IIPublic
The measurement of the 𝜏 → l 𝛾 decay, where l can be a muon or an electron, is of great interest for high energy physics. In the Standard Model, where charged lepton flavour is conserved, this decay is heavily suppressed and can only occur at loop level with very low probability (∼ 𝒪(10−54)). However, several new physics models predict scenarios w… |
BELLE2-MTHESIS-2024-017 | - | 2022-11-11 |
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| Search for the B+ -> K+ nu nubar Decay at Belle II Using a Tagged Analysis ApproachPublic | BELLE2-MTHESIS-2024-015 | - | 2022-11-11 |
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Optimisation of the Data Reduction for the Belle II Pixel Detector and Development of a new Track Finding Algorithm using the Belle II Vertex DetectorPublic
The Belle II experiment, located at the SuperKEKB collider in Tsukuba, Japan, is recording data at world record luminosities in order to provide world-leading results in the field of particle physics in the future. To achieve this goal, it is equipped with two layers of pixel detector (PXD) and a four layered strip detector (SVD). Due to the stron… |
BELLE2-PTHESIS-2022-005 | - | 2022-11-11 |
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Dark shower investigations at Belle II for strongly interacting dark sectorsPublic
The so far unresolved question of the nature of dark matter has led to the development of a multitude of particle physics models that all meet current experimental and theoretical constraints, but differ greatly in the experimental signatures they predict. One idea that has been gaining popularity is that there could be a whole family of dark matt… |
BELLE2-MTHESIS-2023-030 | - | 2022-11-11 |
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Analisi del materiale del rivelatore di vertice di Belle II e caratterizzazione di prototipi per possibili sviluppi futuri.Public
Questa tesi si articola in due argomenti principali: nella prima parte analizzo il contenuto in materiale del rivelatore di vertice, mentre nella seconda parte presento l’attuale sviluppo di VTX, il rivelatore di vertice a pixels che nel 2026- 2027 andr`a a sostituire quello attuale VXD. L’analisi del material budget `e stata effettuata confrontan… |
BELLE2-MTHESIS-2023-022 | - | 2022-11-11 |
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Measurement of the time dependent CP Asymmetry of $B \to K^* \gamma$ decays in the Belle II experimentPublic
The Standard Model of particle physics, which describes the fundamental particles and their interactions, is the most successful theory in the history of science. For decades it has been tested by numerous scientific collaborations with great success. However, the theory remains incomplete. In order to find evidence of physics beyond the Standard … |
BELLE2-PTHESIS-2023-002 | - | 2022-11-11 |
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Analysis of Signal Yield and Branching Fraction of D*0 to D0 gamma; D0 to K- pi+Public
The decay mode D∗0 → D0(K−π+)gamma has been studied using 100 fb-1 of Monte Carlo simulated data generated using Belle-II software framework. Belle II experiment is the successor of the Belle experiment at the KEKB accelerator facility in Tsukuba, Japan. We measure the mass difference (∆M) between the D∗0and D0 mesons using simulated data. We also… |
BELLE2-MTHESIS-2022-034 | - | 2022-11-11 |
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Estimation of wrong flavor tag fraction and Δt resolution by B0 → J/ψK∗0(→ K+π−) mode at Belle II(in Japanese):（日本語原題）Belle II 実験におけるB0 → J/ψK∗0(→ K+π−)モードを用いたフレーバー誤認率とΔt 分解能の評価 Public
B0 → J/ψK∗0(→ K+π−)モードのシミュレーション事象サンプルを用いて、フレーバータグ誤認率を調べ、effective tagging efficiencyを0.3220±0.0020と得た。分解能をtriple Gaussianで表現するモデルを用いてΔt分布をフィットして得たBメソン寿命は1.532 ± 0.004 psで、入力値と無矛盾であることから問題になるバイアスはないことを確かめた。 |
BELLE2-MTHESIS-2022-025 | - | 2022-11-11 |
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Development of the readout software for the luminosity online monitor of the Belle II detectorPublic
In 2018, the Belle II experiment began at the SuperKEKB collider, with a design luminosity of $6\cdot10^{35}$ s$^{-1}$cm$^{-2}$. When studying rare decays, it is necessary to carefully monitor the process of data acquisition, as well as to overview the correct operation of the accelerator and detector. One of the methods to do so is luminosity mea… |
BELLE2-MTHESIS-2023-018 | - | 2022-11-11 |
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Development of Λ baryons reconstruction and its application to the search for a stable hexaquark at Belle IIPublic
QCD-motivated models for hadrons predict an assortment of exotic hadrons, with structures more complex than the quark-antiquark mesons and the threequark baryons of the ordinary hadron classification. Among these, one of the most advertised cases refers to the H dibaryon, a six-quark state with the quark content of two A baryons first suggested b… |
BELLE2-PTHESIS-2023-011 | - | 2022-11-11 |
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Upgrade of Two Dimensional Track Trigger on Central Drift Chamber aimed for Belle II Targeted LuminosityPublic
The Belle II experiment hosted by KEK has started taking physics data since 2019, committed to finding new physics beyond the Standard Model. The SuperKEKB has been upgraded to collide e− and e+ beams with a designed luminosity of 6×1035 cm−2s−1 which is 30 times higher than the predecessor, the Belle experiment. Accompanied by the higher luminosi… |
BELLE2-MTHESIS-2023-012 | - | 2022-11-11 |
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Measurement of beam background at the Belle II electromagnetic calorimeter during 2021 operation (in Japanese):（日本語原題）Belle II 実験の2021年運転期間における電磁カロリメーターでのビームバックグラウンド測定Public
Belle II実験の電磁カロリメーターでCsI(Tl)シンチレーターの発光を読み出すPIN-PD電流モニターのデータを解析し、2021年3月〜6月の運転期間中の放射線被曝はバレル部の前方で0.20 Gy～0.25 Gy、後方で0.33 Gy～0.39 Gy、後方エンドキャップ部の外側で0.40 Gy～0.55 Gy、内側で0.73 Gy～1.02 Gy と算出した。 |
BELLE2-MTHESIS-2022-024 | - | 2022-11-11 |
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Models for axion like particles ALP and sensitivity studies at Belle II experimentPublic
The Standard Model (SM) of particle physics is the theory used to describe the constituent of matter and the fundamental forces acting between them. It is capable of describing a great deal of physical phenomena, but today it is believed to be a non-complete theory. In fact it fails to give explanations to open questions, such as the strong CP pro… |
BELLE2-MTHESIS-2023-028 | - | 2022-11-11 |
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Search for the visible ττ decay of a Z′ dark boson in µµττ final state with Belle IIPublic
In this thesis we investigate the possibility of detecting these new particles in the mass range 3.6-10 GeV/c2 through their decays in a τ+τ− pair in e+e− → µ+µ−τ+τ− events. In particular we search for the visible decay of a Z’ dark boson into a τ+τ− pair with the data collected by the Belle II detector in the first half of 2020, corresponding to … |
BELLE2-PTHESIS-2022-007 | - | 2022-11-11 |
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Performance studies of Thin Fine-Pitch Silicon Vertex Detector for Belle II Vertex Detector upgradePublic
The Belle II experiment located at KEK, Tsukuba (Japan) precisely measures the Standard Model parameters analyzing various flavor physics processes to search for new physics beyond the Standard Model. The Belle II aims to accumulate a large data set of 50 ab−1 and to make this target achievable in reasonable time scale, the KEKB collider was upgra… |
BELLE2-MTHESIS-2023-005 | - | 2022-11-11 |
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