| Title▼ | Belle II Number▼ | Tags | Submit date▼ | Downloads |
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Optimization of the PID algorithms at the Belle II ExperimentPublic
Particle identification in the Belle II experiment involves utilizing information from various sub-detectors to classify six different species of charged particles: electrons, muons, charged pions, charged kaons, protons, and deuterons. Previous studies have demonstrated that directly adding log-likelihoods from each detector for each hypothesis i… |
BELLE2-MTHESIS-2023-038 | - | 2023-11-11 |
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Search for a heavy neutral lepton that mixes predominantly with the tau neutrinoPublic
Heavy neutral leptons (HNLs) are highly motivated as a solution to the problems of neutrino masses, dark matter and the baryon asymmetry of the universe. In light of tight limits set by previous searches for HNLs that mix with electron and muon neutrinos, we search for an HNL that mixes predominantly with the tau neutrino. Such an HNL can be produ… |
BELLE2-MTHESIS-2023-016 | - | 2023-11-11 |
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Measurements of $CP$ asymmetries in $D^0 \to \pi^+ \pi^- \pi^0$ decays in Dalitz plot regions at Belle IIPublic
We perform a search for charge-parity violation (CPV) in the density of events in a binned Dalitz plot of $D^*$-tagged $D^0 \to \pi^+ \pi^- \pi^0$ decays. The data used for this analysis is 362~$\text{fb}^{-1}$ of $\Upsilon(4S)$ data collected at Belle II from 2019--2022. We develop a novel binned Dalitz analysis method to determine local CPV; our… |
BELLE2-PTHESIS-2023-009 | - | 2023-11-11 |
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Search for B+ --> K+ tau tau with Belle and Belle II experimentsPublic
In recent years, some deviations from the Standard Model (SM) have been observed in semileptonic B-meson decays, such as departures from lepton flavour universality in the b --> sll and b --> c tau nu transitions quantified by the R(K(*)) and R(D(*)) ratios. This generated a considerable interest in the flavour physics community: the pattern of an… |
BELLE2-PTHESIS-2023-016 | - | 2023-11-11 |
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Study of Sudden Beam Losses of SuperKEKB and Development of 3D Track Hardware Trigger using Machine Learning at Belle IIPublic
The Belle II Experiment, located at the SuperKEKB asymmetric electron-positron collider in Japan, is at the next generation of B-factories, aiming to explore new physics (NP) in the flavor sector and enhance the precision of Standard Model (SM) measurements. SuperKEKB is expected to achieve the luminosity of $6 \times 10^{35} , \text{cm}^{-2} \tex… |
BELLE2-MTHESIS-2023-037 | - | 2023-11-11 |
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The Alignment of Belle II ARICH Detector and its Influence on the PID Performance (In Japanese) BelleII実験におけるARICH検出器のアライメントと粒子識別性能への影響Public
We performed the alignment of Belle II ARICH detector, and studied its influence on the particle ID performance. |
BELLE2-MTHESIS-2024-005 | - | 2023-11-11 |
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Measurement of the branching fraction and CP asymmetry of B0 → π0 π0 decays at Belle IIPublic
his thesis presents a measurement of the branching fraction and CP -violation asymmetry in B0 → π0π0 decays. The analysis uses a sample that corresponds to 198 × 106 BB pairs, collected by the Belle II experiment at the SuperKEKB accelerator in Tsukuba, Japan. Among collider experiments, only Belle II can efficiently record B0 → π0π0 events at rat… |
BELLE2-PTHESIS-2024-003 | - | 2023-11-11 |
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Search for the B+ to K+ nu anti-nu decay in the Belle II experimentPublic
This thesis describes the first search for the decay of a charged B meson into a charged kaon and a pair of neutrinos using a hadronic tagging method at the Belle II experiment, operating at the asymmetric electron-positron collider SuperKEKB located at KEK, Tsukuba, Japan. The B+ to K+ nu anti-nu decay operates, at the quark level, through a b to… |
BELLE2-PTHESIS-2023-019 | - | 2023-11-11 |
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Measurement of the properties of B+ → ρ+ρ0 decays at Belle IIPublic
This experimental particle-physics thesis reports measurements of properties of B+ → ρ+ρ0 decays for the determination of the quark-mixing matrix angle α = arg(−(VtdV ∗)/(VudV ∗ )), a fundamental parameter of quark dynamics. The analysis tb ub uses the full data set of electron-positron collisions at the Υ(4S) resonance produced by the energy-asym… |
BELLE2-PTHESIS-2023-017 | - | 2023-11-11 |
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Towards a Precision Measurement of Angular Observables in B decays at Belle IIPublic
The flavour changing neutral current b → sl+l− is considered to be one of the most promising particle transitions to search for new physics at the current point of time. It cannot occur directly in the Standard Model, but only through higher order processes, and is therefore highly suppressed. This suppression of the Standard Model amplitude makes… |
BELLE2-MTHESIS-2024-007 | - | 2023-11-11 |
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Evaluation of the Radiation Hardness of MPPCs for Belle II ARICH Upgrade (In Japanese) BelleII実験ARICH検出器アップグレードに向けた光検出器MPPCの放射線耐性の評価Public
Evaluated the radiation hardness of MPPCs for Belle II ARICH Upgrade. |
BELLE2-MTHESIS-2024-004 | - | 2023-11-11 |
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The study of K0L Identification with ECL Information at Belle II experimentPublic
We can study K0L through K0L particle list reconstructed from ECL cluster or KLM cluster. Particle identification (PID) can help separate K0L from other particles, like γ, neutron, anti-neutron and other neutral particles. This thesis shows the establishment, method, performance and the comparison of K0L particle identification by using only ECL i… |
BELLE2-MTHESIS-2023-035 | - | 2023-11-11 |
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Search for new physics in charged lepton flavor violating processes at the Belle II experiment.Public
In particle physics, charged Lepton Flavor Violating (cLFV) processes have not been observed. If they were observed, they would necessarily lead to new physics scenarios. The τ lepton is the heaviest lepton in the Standard Model of particle physics. It is the only lepton heavy enough to decay into leptons or hadrons; moreover, its production mecha… |
BELLE2-PTHESIS-2023-014 | - | 2023-11-11 |
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| Measurement of R(D*) with Inclusive B Meson Tagging at Belle IIPublic | BELLE2-MTHESIS-2024-014 | - | 2023-11-11 |
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Radiation tolerance studies of the double sided silicon strip sensorPublic
The B meson decays can be studied precisely and compared with the standard model (SM) to search for new physics of elementary particles. The Belle II experiment, which has an accelerator and detector in Tsukuba, Ibaraki, Japan, is also called the “B factory” experiment, and produces many B mesons and can precisely measure their decays. Currently, … |
BELLE2-MTHESIS-2023-002 | - | 2023-11-11 |
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The Belle II Silicon Vertex DetectorsPublic
Design, performance, and outlook of SVD and PXD |
BELLE2-TALK-CONF-2023-173 | - | 2023-11-07 |
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Status and Prospects of Belle IIPublic
Status and Prospects of Belle II |
BELLE2-TALK-CONF-2023-187 | - | 2023-11-07 |
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B+ -> K+ nu nubar at Belle IIPublic
B+→K+𝜈𝜈̅ and other highlights from Belle II |
BELLE2-TALK-CONF-2023-188 | - | 2023-11-07 |
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Recent time-dependent measurements of 𝑪𝑷 violation at Belle IIPublic
We report on new time-dependent \CP violation measurements using the full dataset of \belletwo collected between 2019-2022 and on improved analysis software. Hadronic penguin decays, which proceed via a $b \to \qqbar s$ transition, are loop dominated, and thus sensitive to new physics. in this class, we measure the time-dependent \CP violation pa… |
BELLE2-CONF-PROC-2023-044 | - | 2023-11-06 |
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Searches for Quantum Decoherence at Belle and Belle IIPublic
Entaglement of B0 in Y(4s) decays. Check of Bell`s Inequality Decohrence and time dependent B0 oscillations and TDCPV Measurement at Belle Palns at Belle II |
BELLE2-TALK-CONF-2023-189 | - | 2023-11-06 |
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