| Title▼ | Belle II Number▼ | Tags | Submit date▼ | Downloads |
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Belle II 実験レベル 1 トリガーのための3 次元飛跡再構成アルゴリズムの開発Public
Belle II 実験は SuperKEKB 加速器での電子陽電子衝突で生成された B 中間子や D 中間子、τ... |
BELLE2-MTHESIS-2024-012 | - | 2024-11-11 |
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Measurement of the properties of B0→π0π0 decays at Belle II Public
This experimental particle-physics thesis reports measurements of the branching fraction and charge-parity (CP) violating decay-rate asymmetry of B0 → π0π0 decays reconstructed in electron-positron collisions with the Belle II detector. These quantities constrain parameters of potential processes not described by the Standard Model of particle phy… |
BELLE2-PTHESIS-2024-012 | - | 2024-11-11 |
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Study of the reconstruction efficiency of π0 mesons from decays of the lepton τ at the Belle II experimentPublic
This experimental particle-physics thesis explores a novel approach to the determination of the π0 meson reconstruction efficiency, whose uncertainty is a significant limitation in measurements sensitive to beyond Standard Model physics. I aim to determine the π0 reconstruction efficiency by comparing the rates of τ− → π− π^0 ντ with τ− → π− ντ de… |
BELLE2-MTHESIS-2024-022 | - | 2024-11-11 |
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Study of monolithic CMOS pixel sensors in the Belle II experiment upgradePublic
Belle II is a particle physics experiment located at the KEK laboratory in Tsukuba (Japan). The detector is a general-purpose spectrometer to study electron-positron collisions produced by the SuperKEKB accelerator, a second generation flavor-factory which operates at the luminosity frontier, holding the world record of instantaneous luminosity wi… |
BELLE2-MTHESIS-2024-016 | - | 2024-11-11 |
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Search for B+ -> K+ nu nubar at Belle II using Graph Neural NetworksPublic
This work presents the search for the decay of a charged B-meson into a charged kaon and a pair of neutrinos via graph-tagged analysis, which is an approach based on graph neural network, in Belle~II, which is operating at the asymmetric electron-positron collider SuperKEKB located at KEK, Tsukuba, Japan. B+ -> K+ nu nubar is a flavour changing … |
BELLE2-MTHESIS-2024-021 | - | 2024-11-11 |
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Study of the B0->D*-l+vl decay at Belle II for a new measurement of the decay dynamics and |Vcb|Public
This is an experimental particle physics thesis that aims to study the exclusive semileptonic decay B0 → D∗−l+νl at Belle II for a new measurement of its decay dynamics and |Vcb|. Belle II is a particle physics experiment that focuses on weak-interaction processes of heavy quarks to search for indirect indications of non-standard-model physics. Th… |
BELLE2-UTHESIS-2024-004 | - | 2024-11-11 |
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Search for lepton flavor universality violation in $\overline{B} \rightarrow D^{*}\tau^{-}\overline{\nu}_{\tau}$ decays using hadronic $B$ tagging at the Belle II experimentPublic
In the standard model of particle physics (SM), lepton flavor universality is an axiom that states that the coupling constants in the interaction between leptons and gauge particles are the same regardless of the lepton flavor $e$, $\mu$, or $\tau$. This universality has been demonstrated by various experiments. On the other hand, in the semi-lept… |
BELLE2-PTHESIS-2024-019 | - | 2024-11-11 |
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Measurement of the properties of B0 → π0π0 decays at Belle IIPublic
This experimental particle-physics thesis reports measurements of the branching fraction and charge-parity (CP) violating decay-rate asymmetry of B0 → π0π0 decays reconstructed in electron-positron collisions with the Belle II detector. These quantities constrain parameters of potential processes not described by the Standard Model of particle phy… |
BELLE2-PTHESIS-2024-018 | - | 2024-11-11 |
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Search for radiative $D_s$ decaysPublic
The study of weak radiative decays of charmed mesons is still in its developing stage. The weak decays of $D$ mesons pose challenges due to significant final-state interactions. However, decays mediated by $c \rightarrow u \gamma$ transitions can be affected by potential contributions coming from the non-minimal supersymmetry, which is an new phys… |
BELLE2-CONF-PROC-2024-027 | - | 2024-11-10 |
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Hadronic $B$ decays at Belle and Belle IIPublic
The Belle and Belle II B-factories have collectively gathered an extensive 1.1~ab$^{-1}$ dataset of $e^+ e^-$ collisions at the $\Upsilon(4S)$ resonance, resulting in the production of numerous $B\bar{B}$ pairs. This allows for precise measurements of hadronic $B$ decays, which is essential to test Quantum Chromodynamics (QCD) and refine theoretic… |
BELLE2-CONF-PROC-2024-025 | - | 2024-11-08 |
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Study of Radiative Decays of X(3872) Using the Belle and the Belle II Detectors.Public
We present here a preliminary Monte Carlo (MC) simulation study of $X(3872)\to J/\psi\gamma$ and $X(3872)\rightarrow \psi(2S)\gamma$ in the decay of $B\to (c\bar{c}\gamma)K$ where $B$ stands for $B^{\pm}$, $B^0$ and $K$ stands for $K^\pm$, $K^0_S$. The previous Belle measurement did not find any significant signal for $X(3872)\rightarrow \psi(2S)\… |
BELLE2-CONF-PROC-2024-026 | - | 2024-11-08 |
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Upgrade of the Belle II Vertex Detector with monolithic active pixel sensorsPublic
The Belle II experiment at the SuperKEKB accelerator in Japan is dedicated to exploring physics beyond the Standard Model by performing high-precision measurements of heavy-flavor processes. The SuperKEKB will undergo a major upgrade during a second long shutdown to achieve the target luminosity of 6$\times$10$^{35}$ cm$^{-2}$s$^{-1}$. The vertex … |
BELLE2-CONF-PROC-2024-024 | - | 2024-10-16 |
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BPAC focused review in autumn 2024: Sep 24-25,2024Public
B-factory Programme Advisory Committee Report for Focused Review Meeting of Fall 2024 |
BELLE2-REPORT-2024-046 | - | 2024-10-14 |
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Quantum tests with entangled B meson pairs at the Belle and Belle II ExperimentsPublic
Quantum tests with entangled B meson pairs at the Belle and Belle II Experiments |
BELLE2-TALK-CONF-2024-118 | - | 2024-10-01 |
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Experimental overview: exclusive Vcb at Belle IIPublic
This talk will provide an experimental overview of both inclusive and exclsuive Vcb & Vub determinations at Belle and Belle II. |
BELLE2-TALK-CONF-2024-120 | - | 2024-09-30 |
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Belle II at SuperKEKB: status and perspectivesPublic
Belle II at SuperKEKB: status and perspectives |
BELLE2-TALK-CONF-2024-119 | - | 2024-09-29 |
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Measurements of $\left|V_{cb}\right|$ and $\left|V_{ub}\right|$ at Belle and Belle$~$IIPublic
The Belle and Belle$~$II experiments have collected a 1.1 ab$^{-1}$ sample of collisions at the $\Upsilon(4S)$ resonance. These data, with low particle multiplicity and constrained initial state kinematics, are an ideal environment to study semileptonic and leptonic decays of the $B$ meson. Combined with theoretical inputs, measurements of both in… |
BELLE2-CONF-PROC-2024-023 | - | 2024-09-27 |
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Simultaneous analysis of B->Dlnu and B->D*lnu to improve the determination of |Vcb|Public
We propose a simultaneous analysis of $B\to D\ell\nu$ and $B\to D^*\ell\nu$ decays to measure model-independent observables for the determination of $|V_{cb}|$. The $B\to D^*\ell\nu$ decays is partially reconstructed, removing systematic uncertainty on $|V_{cb}|$ from the soft-pion reconstruction. By assuming equality of the semileptonic decay wid… |
BELLE2-TALK-CONF-2024-124 | - | 2024-09-23 |
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Measurement of the B -> D*lnu form factor at BellePublic
Measurement of the B -> D*lnu form factor at Belle |
BELLE2-TALK-CONF-2024-122 | - | 2024-09-23 |
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Combining R(D(*)) measurements at Belle IIPublic
The R(D(*)) ratio is an excellent test of Lepton Flavor Universality, that promises to elucidate the nature of potential Beyond the Standard Model physical processes. In this talk, we present the latest R(D(*)) measurements from the Belle II experiment. Additionally, we explore a likelihood based combination of different analyses relying on orthog… |
BELLE2-TALK-CONF-2024-123 | - | 2024-09-23 |
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