| Title▼ | Belle II Number▼ | Tags | Submit date▼ | Downloads |
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Bottomonium physics at Belle IIPublic
Bottomonium spectroscopy offers excellent opportunities for insights on the behavior of QCD in the non-perturbative regime. In order to guide theorists through the difficult task of modeling non-perturbative QCD phenomena, the experimental measurement of masses, widths, and transition rates of bb¯ states is crucial. Recent analyses of Belle and Be… |
BELLE2-TALK-CONF-2023-020 | - | 2023-01-23 |
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Bottomonium physics at Belle IIPublic
Bottomonium spectroscopy offers excellent opportunities for insights on the behavior of QCD in the non-perturbative regime. In order to guide theorists through the difficult task of modeling non-perturbative QCD phenomena, the experimental measurement of masses, widths, and transition rates of bb¯ states is crucial. Recent analyses of Belle and Be… |
BELLE2-TALK-CONF-2023-003 | - | 2023-01-21 |
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BPAC focused review in autumn 2022: Oct 31-Nov 2,2022Public
B-factory Programme Advisory Committee Complete report for Focused Review Meeting 31 October and 1 November 2022 Remote Meeting |
BELLE2-REPORT-2024-006 | - | 2023-01-16 |
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Measurements of Branching Fraction and time-dependent {\boldmath $C\!P$} Asymmetry in {\boldmath $\Bz\rightarrow \KS\piz$} Decays at Belle~IIPublic
We report the measurements of branching fraction ($\mathcal{B}$) and time dependent $\CP$-violating asymmetry ($\ACP$ and $\SCP$) in the charmless decays $\Bz\to K^0\pi^0$ at Belle~II. A sample of $\ep\en$ collisions, corresponding to $361.5\invfb$ of integrated luminosity, recorded near the $\Upsilon(4S)$ resonance is used for the study. We fin… |
BELLE2-PUB-PH-2023-001 | - | 2023-01-16 |
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The Silicon Vertex Detector of the Belle II ExperimentPublic
Belle II is an experiment taking data at an asymmetric energy e+e- collider, SuperKEKB, which is operated at the Υ(4S) resonance energy. The Belle II vertex detector is composed of an inner two-layer pixel detector (PXD) and an outer four-layer double-sided strip detector (SVD). A deep knowledge of the system has been gained since the start of the… |
BELLE2-CONF-PROC-2023-003 | - | 2023-01-13 |
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Status and prospects for dark sector searches at Belle IIPublic
None |
BELLE2-CONF-PROC-2023-002 | - | 2023-01-01 |
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The TOP counter and determination of bunch-crossing time at Belle IIPublic
At the Belle II experiment a Time-of-Propagation (TOP) counter is used for particle identification in the barrel region. This novel type of particle identification device combines the Cherenkov ring imaging technique with the time-of-flight and therefore it relies on a precise knowledge of the time of collision in each triggered event. We discuss … |
BELLE2-CONF-PROC-2022-022 | - | 2022-12-20 |
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A measurement of the ratio of light-lepton inclusive semileptonic $B$ decay rates $R(X_{e/\mu})$ = $\mathcal{B}(B\to X e \nu)$ / $\mathcal{B}(B\to X \mu \nu)$ using $189\,\mathrm{fb}^{-1}$ of data at Belle~IIPublic
In this work a measurement of the ratio of branching fractions of inclusive semileptonic $B$ meson decays, $R(X_{e/\mu})=\mathcal{B}(B\to X e \nu)/\mathcal{B}(B\to X \mu \nu)$ is reported as a probe of $e-\mu$ universality. Electron-positron collisions collected at the $\Upsilon(4S)$ resonance with the Belle II detector corresponding to $189\,\mat… |
BELLE2-CONF-PROC-2023-006 | - | 2022-12-16 |
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Recent Belle II results related to lepton-flavor universality and violationPublic
The rate of semitauonic $B$ decays has been consistently above theory expectations since these decays were first measured. Also, there are various anomalies in flavour-changing neutral current decays $b->sll$. The low-background collision environment along with the possibility of partially or fully reconstructing one of the two $B$ mesons in the e… |
BELLE2-TALK-CONF-2023-002 | - | 2022-12-05 |
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Recent dark-sector results at Belle IIPublic
Belle II has unique reach for a broad class of models that postulate the existence of dark matter particles with MeV—GeV masses. This talk presents recent world-leading physics results from Belle II searches for dark Higgstrahlung and Zprime decays; as well as the near-term prospects for other dark-sector searches. |
BELLE2-TALK-CONF-2023-001 | - | 2022-12-05 |
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Reconstruction of B→ρℓνℓ decays identified using hadronic decays of the recoil B meson in 2019 -- 2021 Belle II dataPublic
We present results on the semileptonic decays $B^0 \to \rho^- \ell^+ \nu_\ell$ and $B^+ \to \rho^0 \ell^+ \nu_\ell$ in a sample corresponding to 189.9/fb of Belle II data at the SuperKEKB $e^- e^+$ collider. Signal decays are identified using full reconstruction of the recoil $B$ meson in hadronic final states. We determine the total branching fra… |
BELLE2-CONF-PH-2022-029 | - | 2022-11-29 |
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Contribution of Belle/Belle II to the CKM unitarityPublic
This talk reviews updated constraints to the CKM unitarity triangle, in particular new measurements of |Vcb| and |Vub| and of phi3/gamma. |
BELLE2-TALK-CONF-2022-134 | - | 2022-11-24 |
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Measurement of instrumental asymmetries of kaons and pionsPublic
We measure instrumental asymmetries of kaons and pions using $D^0 \to K^-\pi^+$ and $D^- \to K^0_S\pi^-$ decays. We use the data collected by Belle II at the $\Upsilon(4S)$ energy during 2019, 2020 and the first half of 2021 which correspond to 189\,fb$^{-1}$ of integrated luminosity. We study the dependence of the instrumental asymmetries on the … |
BELLE2-NOTE-PL-2022-004 | - | 2022-11-23 |
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Branching fractions and CP asymmetries in B decays through b -> c processes at BellePublic
We report results of the branching fractions for a number of charm B decays including $\APBzero \to \PD^{*+}\Ppiminus$, $\APBzero \to \PD^{*+}\PKminus$, $\APBzero \to \PDplus\Ppiminus$ and $\APBzero \to \PDplus\PKminus$ all measured using $772\times 10^6$ B-meson pairs recorded by the Belle experiment at the KEKB asymmetric-energy $e^+e^-$ collide… |
BELLE2-CONF-PROC-2022-021 | - | 2022-11-15 |
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Lepton flavor universality at Belle and Belle IIPublic
We report the test of lepton flavor universality at Belle and Belle II experiments considering b -> c and b -> s transitions. We use 711/fb and 189/fb of data collected at Y(4S ) resonance from electron-positron collisions for Belle and Belle II, respectively. For the b -> c transition, we present the measurement of lepton-flavor-universality in B… |
BELLE2-CONF-PROC-2022-020 | - | 2022-11-12 |
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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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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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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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Multivariate analysis methods for the optimization of searches for new physics with leptons at Belle IIPublic
This thesis will cover the use of multiple multivariate analysis (MVA) methods ap- proaches for the identification of Leptons in the Belle II experiment. First, I will compare two machine learning techniques in terms of classification and performance, then I will focus on Lepton Flavour universality (LFU) violation in tau decays using multivariate… |
BELLE2-MTHESIS-2024-008 | - | 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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