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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 | Vishal Bhardwaj, Sourabh Chutia |
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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 | Swarna Maharana |
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The Silicon Vertex Detector of the Belle II experimentPublic
The Belle II silicon vertex detector (SVD) is a four-layer double-sided silicon strip detector installed within the Belle II detector located at KEK, Japan. SVD has been operating smoothly and reliably since the start of data taking in March 2019. The data quality and radiation damage effects have been constantly monitored. In this article, we rep… |
BELLE2-CONF-PROC-2024-006 | Abdul Kaliyar |
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Searches for invisible new particles at Belle IIPublic
Belle II has unique sensitivity for a broad class of models postulating the existence of dark matter particles with masses in the MeV–GeV range. We present recent world-leading results from Belle II searches for several non-SM particles. These include production of 𝑍′ bosons, axion-like particles, and dark scalars in association with two muons in … |
BELLE2-CONF-PROC-2024-005 | Luigi Corona |
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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 | A. Kumar. |
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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 | Michele Aversano |
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Recent highlights from the Belle and Belle II experimentsPublic
The Belle experiment at the KEKB factory in Tsukuba served as a B factory with the primary goal of discovering CP violation (CPV) in B meson decays and confirming the Cabibbo-Kobayashi-Maskawa (CKM) paradigm. It operated until 2018, achieving significant milestones in flavor physics. Building on this legacy, the Belle II experiment is an upgraded … |
BELLE2-CONF-PROC-2024-022 | Yubo Han |
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Searches for lepton-flavour violation in $\tau$ decays at Belle and Belle$~$IIPublic
The Belle II experiment is an upgrade of the Belle experiment, and both have extensive plans to search for new physics, in particular to search for lepton flavour and number and baryon number violations (LFV, LNV and BNV) in tau decays. In the low background environment of the $e^+e^-$ collision experiment, the production cross section for $\tau$ … |
BELLE2-CONF-PROC-2024-021 | Wenzhe Li |
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Quarkonium/QCD results at Belle IIPublic
This proceeding summarizes recent discoveries and interprets exotic multiquark-bound states to probe the fundamentals of QCD at the Belle and Belle II experiments. The results are on a unique data set collected at energies higher than Υ(4S), including searches for the hidden bottom transition between Υ(10750) and 𝜒_𝑏𝐽. |
BELLE2-CONF-PROC-2023-039 | Ming-Chuan Chang |
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Recent Belle II results related to 𝑩 anomaliesPublic
Semileptonic 𝐵-meson decays involving the quark transition 𝑏 → 𝑐𝑙𝜈 provide excellent sensitivity to probe potential lepton-flavour universality violation. This work introduces two recent measurements related to tests of light-lepton flavour universality using a data sample collected at the Υ(4𝑆) resonance on the Belle II experiment corresponding t… |
BELLE2-CONF-PROC-2023-038 | Yulan Fan |
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Semileptonic $B$ decays from Belle and Belle IIPublic
This proceeding summarizes recent measurements of the CKM matrix elements $|V_{cb}|$, $|V_{ub}|$, and lepton-flavor universality tests in semileptonic B decays from the Belle and Belle~II experiments. The decay branching factions $R(D^{*})$ and $R(X)$ are measured with the Belle~II early dataset and the results are found to be consistent with the … |
BELLE2-CONF-PROC-2024-014 | Lu Cao |
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Tau physics at Belle and Belle IIPublic
We present here the major results obtained in tau physics by the Belle and Belle II experiments. For the Belle II experiment, we also discuss prospects for improved measurements of the tau lepton properties, new results in Michel parameters determination, and searches for CP and lepton flavor violation in tau decays. |
BELLE2-CONF-PROC-2024-013 | Denis Bodrov |
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TOP detector for particle identification at Belle IIPublic
The Time-Of-Propagation (TOP) counter is a ring-imaging Cherenkov detector designed to identify the charged hadrons in the barrel region of the Belle II detector. The Belle II experiment collected data delivered by the SuperKEKB accelerator from March 2019 to June 2022. After the first run period (Run1) a long shutdown (LS1) was dedicated to imple… |
BELLE2-CONF-PROC-2024-012 | Ezio Torassa |
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Charm physics at the Belle and Belle II experimentsPublic
We present recent results on charm physics at the Belle and Belle II experiments, covering measurements of charm lifetimes, branching fractions of the decays of charmed mesons and baryons and the decay asymmetry parameters of two-body decays of charmed baryons, searches for rare and forbidden decays, and measurements of $C\!P$ violating parameters… |
BELLE2-CONF-PROC-2024-011 | Longke Li |
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The silicon vertex detector of the Belle II experimentPublic
The silicon vertex detector (SVD) is a four-layer double-sided strip detector installed at the heart of the Belle II experiment, taking data at the high-luminosity $B$-Factory SuperKEKB since 2019. SVD has been operating smoothly and reliably, showing a stable and above-99\% hit efficiency, and a large signal-to-noise ratio in all sensors. In Jun… |
BELLE2-CONF-PROC-2024-010 | Alice Gabrielli |
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A new graph-neural-network flavor tagger for Belle~II and measurement of $\sin2\phi_1$ in $B^0 \to J/\psi K^0_\text{S}$ decaysPublic
We present GFlaT, a new algorithm that uses a graph-neural-network to determine the flavor of neutral $B$ mesons produced in $\Upsilon(4S)$ decays. We evaluate its performance using $B$ decays to flavor-specific hadronic final states reconstructed in a 362 $\mathrm{fb}^{-1}$ sample of electron-positron collisions at the $\Upsilon(4S)$ resonance re… |
BELLE2-CONF-PROC-2024-009 | Petros Stavroulakis |
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Radiative B decays at Belle and Belle IIPublic
Rare decays of B mesons to radiative final states serve as an ideal ground to search for New Physics effects from short range contributions. Being one of the first transitions of the electroweak penguin family to be observed by CLEO in the early 90s, these transitions still serve an impor- tant role in testing the predictions of the Standard Model… |
BELLE2-CONF-PROC-2024-008 | Rahul Tiwary |
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$C\!P$ violation in $D$ meson decays at Belle I/IIPublic
We present recent measurements from the Belle and Belle II experiment related to $CP$ violation in decays of charmed mesons via two complementary approaches. We also propose a new algorithm to determine the flavor of neutral charmed mesons. |
BELLE2-CONF-PROC-2024-007 | Michel Bertemes |
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Study of $B^{+} \to D_{s}^{(*)+}\pi^{0}$ mode at BellePublic
We present here the sensitivity study of the rare decay modes $B^{+} \to D_{s}^{+}\pi^{0}$ and $B^{+} \to D_{s}^{(\ast)+}\pi^{0}$, at Belle using a simulated sample. The {\sc BaBar} collaboration has measured the branching fraction $\mathcal{B}(B^{+} \to D_{s}^{+}\pi^{0}) = (1.5^{+0.5}_{-0.4} \pm 0.1 \pm 0.2) \times 10^{-5}$ with a data sample of … |
BELLE2-CONF-PROC-2024-004 |
Vishal Bhardwaj
Manish Kumar |
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Recent quarkonium results from Belle IIPublic
The Belle II experiment at the SuperKEKB energy-asymmetric $e^+e^-$ collider is the upgraded successor of the $B$-factory facility at the KEK laboratory, Japan. The designed instantaneous luminosity of the machine is $6 \times 10^{35} \rm cm^{-2}s^{-1}$. The Belle II experiment aims to ultimately accumulate 50 ab$^{-1}$ of data, 50 times more than… |
BELLE2-CONF-PROC-2024-003 | Renu Garg |
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