| Title▼ | Belle II Number▼ | Tags | Submit date▼ | Downloads |
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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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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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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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Inclusive B-Meson Tagging for an R(D*) Measurement at Belle IIPublic
The world average of previous R(D(*)) measurements, defined as R(D(*)) = BR(B -> D(*) tau nu) / BR(B -> D(*) l nu) with l = e, mu, shows a 3.3 sigma deviation from Standard Model predictions, which could indicate some New Physics phenomenon, such as the existence of Leptoquarks. This analysis uses simulations from the Belle II experiment at the Su… |
BELLE2-MTHESIS-2023-032 | - | 2022-11-11 |
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Anomaly Detection in Searches for Inelastic Dark Matter with a Dark Higgs at Belle IIPublic
In recent years a complementary search paradigm to classical searches has gained traction in the high energy physics community. While classical searches select regions of interest in the data based on a simulation of potential signal models, anomaly detection seeks to identify data regions, that are anomalous with respect to the data. Such searche… |
BELLE2-MTHESIS-2023-003 | - | 2022-11-11 |
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Investigation of Belle II Experiment Sensitivity to Magnetic MonopolesPublic
The possibility of searching for magnetic monopoles with a magnetic charge value of 68.5𝑒 in the mass range 50 – 4600 MeV in the Belle II collider experiment was investigated. The values of the flight lengths of magnetic monopoles of different masses are obtained, the efficiency of the level one trigger for the registration of magnetic monopoles … |
BELLE2-MTHESIS-2022-019 | - | 2022-11-11 |
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Tagged analysis of semileptonic B decays with uncharmed vector mesons at BellePublic
The tagged analysis of semileptonic B decays with uncharmed vector mesons at Belle |
BELLE2-MTHESIS-2022-011 | - | 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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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 a visibly decaying Z' dark boson at Belle II in e^+e^- --> mu^+mu^-mu^+mu^- events.Public
The Standard Model (SM) of fundamental particles and interactions is a highly predictive theory. Despite this, it cannot be considered as a complete description of the nature, because of the many observed phenomena which are not taken into account. Among these phenomena not predicted by the SM, there are observations which could be explained throu… |
BELLE2-PTHESIS-2023-008 | - | 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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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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Search for the Lepton Flavor Violating B+ → K+ τ (e, μ) decays with the Belle and Belle II detectorsPublic
For over a decade, many deviations from the Standard Model have been observed in semileptonic B-meson decays, for example, the departure from the lepton flavor universality in b → sll and b → c τ ν transitions. Many New Physics (NP) models trying to explain these results also predict a violation of the leptonic flavor (LFV). In this context, we ar… |
BELLE2-PTHESIS-2023-018 | - | 2022-11-11 |
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Study of resonant B0 -> Xd/s l+l- branching ratiosPublic
The thesis focuses on resonant processes of B → Xℓℓ decay using 1 ab^−1 Monte-Carlo simulated data at Belle II. The channels being analysed are B0 → K0s J/ψ,B0 → K0s ψ(2S),B0 →π0 J/ψ,B0 → π0 ψ(2S),B0 → K∗(K+π−)γ∗,B0 → ρ0 γ∗. At the loop level, the cross section of the decay modes of B0 → Xd/s ℓ+ℓ− is dependant on the matrix elements Vcd and Vcs. S… |
BELLE2-MTHESIS-2022-038 | - | 2022-11-11 |
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Search for B→Kνν decays with a machine learning method at the Belle II experimentPublic
This thesis documents a search for the rare decay of a B meson into a K meson and a pair of neutrinos at the Belle II experiment, which is located along the SuperKEKB energy-asymmetric electron-positron collider. This decay has never been observed, its branching fraction is predicted with accuracy in the standard model of particle physics, and is … |
BELLE2-PTHESIS-2022-010 | - | 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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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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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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Searches for the rare 𝑩+ −> 𝑲+ v v̄ and 𝑩𝟎 −> 𝑲∗𝟎 v v̄ decays using an inclusive tagging method at the Belle II experimentPublic
This thesis presents two searches for the rare B → K(∗)νν ̄ decays at the Belle II experiment, operating at the SuperKEKB asymmetric-energy electron-positron collider, at the KEK laboratories in Tsukuba, Japan. The B → K(∗)νν ̄ decays are based on the b → sνν ̄ flavour-changing neutral-current transition. This process is forbidden at the Born level i… |
BELLE2-PTHESIS-2022-011 | - | 2022-11-11 |
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Analysis of D∗0 −→ D0(K−π+) π0(γγ) in Belle-II experiment Public
The decay mode D∗0 → D0(K−π+)π0(γγ) has been studied using 100 f b−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. It has been designed to make precise measurements of weak interaction parameters and find ne… |
BELLE2-MTHESIS-2022-035 | - | 2022-11-11 |
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