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B -> Xu l nu inclusive study at Belle IIPublic
This talk will review the inclusive B->Xu l nu measurements at Belle and present the status of ongoing activities at Belle II with a focus on the potential improvements in the analysis strategies. |
BELLE2-TALK-CONF-2024-121 | - | 2024-09-23 |
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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 | - | 2024-09-22 |
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Searches for CLFV in tau and hadron decays at Belle and Belle IIPublic
Rates of lepton-flavor violation in charged lepton decays are enhanced in many beyond-the-standard-model theories. The low-background samples of e+e−→τ+τ− events collected by Belle and Belle II allow world-leading searches for such decays with tau leptons. We present Belle II results for the decays τ→ℓV0, where V0 is a neutral vector meson, τ→3μ, … |
BELLE2-TALK-CONF-2024-125 | - | 2024-09-16 |
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Measurements of electroweak penguin and lepton-flavour violating $B$ decays to final states with missing energy at Belle and Belle IIPublic
Electroweak penguin and lepton-flavour violating $B$ decays are key focuses of the Belle II physics program. These processes are particularly challenging due to the presence of neutrinos in the final states, resulting in `missing energy' in the rare $b\to s$ transitions. Using electron-positron collision data collected at the $\Upsilon(4S)$ resona… |
BELLE2-CONF-PROC-2024-020 | - | 2024-09-11 |
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Belle II input to HVPPublic
We present the status on measurements related to hadronic vacuum polarization contribution to muon g-2 at the Belle II |
BELLE2-TALK-CONF-2024-126 | - | 2024-09-09 |
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Measurements of hadronic B decay rates at Belle and Belle IIPublic
The Belle and Belle~II experiments have collected a 1.1~ab$^{-1}$ sample of $e^+ e^-\to B\bar{B}$ collisions at the $\Upsilon(4S)$. The study of hadronic $B$ decays in these data allow the precise measurement of absolute branching fractions and angular distributions of the decay products. These measurements provide tests of QCD and enable the gene… |
BELLE2-CONF-PROC-2024-019 | - | 2024-08-28 |
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Precision measurements of $\tau$ lepton decays at Belle IIPublic
The Belle$~$II experiment has collected a $424~\mathrm{fb}^{-1}$ sample of $e^+e^-$ collision data at centre-of-mass energies near the $\Upsilon(nS)$ resonances. This sample contains 389 million $e^+e^-\to \tau^+\tau^{-}$ events, which we use for precision tests of the standard model. We present measurements of leptonic branching fractions, lepton… |
BELLE2-TALK-CONF-2024-114 | - | 2024-08-26 |
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Recent results from Belle and Belle IIPublic
The Belle II experiment has collected 424 fb$^{-1}$ sample of $e^+e^-$ collisions produced by the asymmetric SuperKEKB collider, at a centre-of-mass energy equal to or near the mass of the $\Upsilon(4S)$ resonance. Ninety-percent of the sample is at the $\Upsilon(4S)$ resonance, which decays to $B$-meson pairs. The predecessor experiment, Belle, c… |
BELLE2-TALK-CONF-2024-116 | - | 2024-08-26 |
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Semileptonic and missing energy B decays at Belle IIPublic
The Belle II experiment has collected a 364 $fb^{-1}$ sample of collisions at the $\Upsilon (4S)$ resonance. This dataset, with its low particle multiplicity and well-constrained initial state, provides an ideal environment for studying semileptonic and missing energy B decays. In this talk, I will present recent results on these decays, emphasizi… |
BELLE2-TALK-CONF-2024-115 | - | 2024-08-26 |
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Belle II Data Management PlanPublic
The primary focus of this document is to detail the Belle II policy ensuring that Belle II data will be reliably maintained in a form accessible to Belle II members. |
BELLE2-REPORT-2024-045 | - | 2024-08-24 |
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BSM discovery potential at Belle IIPublic
BSM discovery potential at Belle II |
BELLE2-TALK-CONF-2024-117 | - | 2024-08-19 |
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Status and Prospects of Studies on Exotic Hadrons at Belle IIPublic
Hidden-flavour states are being actively studied at Belle II; the programme is currently focussed on energy scan data taken above the Upsilon(4S). Several results will be discussed, including constraints on the properties of the Upsilon(10753), and analyses combining Belle and Belle II data. Prospects for further results will also be set out, incl… |
BELLE2-TALK-CONF-2024-113 | - | 2024-08-19 |
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Rare B decays at e+e− collidersPublic
The rare decays of B mesons offer a prime opportunity to test predictions of the Standard Model and to search for effects beyond the Standard Model. The coherent production of B mesons at e+e− colliders provides a clean experimental setup for these studies. In this paper, we discuss the recent results of rare B decays from the Belle and Belle II e… |
BELLE2-CONF-PROC-2024-018 | - | 2024-08-15 |
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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 | - | 2024-08-15 |
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Bottomonium and exotic spectroscopyPublic
This proceedings summarize the most recent measurements of exotic bottomonium states to probe the fundamentals of QCD at the Belle, Belle II and LHCb experiments. |
BELLE2-CONF-PROC-2024-017 | - | 2024-08-10 |
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ALP searches at e+e- colliders, including Belle (II), BaBar and BESS III as applicablePublic
Low-energy, high-luminosity electron-positron (e+e−) colliders are ideally suited for probing light particles predicted by theories beyond the Standard Model, thanks to their large datasets and precise resonance reconstruction capabilities. This talk will present the latest results from searches for Axion-Like Particles (ALPs) at e+e− colliders, f… |
BELLE2-TALK-CONF-2024-112 | - | 2024-08-04 |
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Working Safely at KEKPublic
Safety document for KEK users, primarily working on Belle II. Updated 2024. |
BELLE2-REPORT-2024-043 | - | 2024-07-29 |
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Measurements of lepton-flavour universality in semileptonic B decays at Belle and Belle IIPublic
The Belle and Belle II experiments have collected a $1.1$\,ab$^{-1}$ sample of $e^{+}e^{-} \rightarrow B\bar B$ collisions at the $\Upsilon(4S)$ resonance. These data, with low particle multiplicity, constrained initial state kinematics and excellent lepton identification, are an ideal environment to study lepton-flavour universality in semilepton… |
BELLE2-CONF-PROC-2024-015 | - | 2024-07-21 |
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Searches for Dark Sector Particles at Belle and Belle IIPublic
The Belle and Belle II experiment have collected samples of $e^+e^-$ collision data at centre-of-mass energies near the $\Upsilon(nS)$ resonances. These data have constrained kinematics and low multiplicity, which allow searches for dark sector particles in the mass range from a few MeV to 10 GeV. The latest dark sector results by Belle and Bell… |
BELLE2-CONF-PROC-2024-016 | - | 2024-07-21 |
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Precision measurements of $\tau$ lepton decays at Belle IIPublic
Present the precision test of LFU and measurement of tau mass. |
BELLE2-TALK-CONF-2024-092 | - | 2024-07-18 |
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