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Measurement of the $B^{0}$ lifetime using fully reconstructed hadronic decays in the 2019 Belle II dataset Public
This document presents the measurement of B 0 meson lifetimes using the 2019 Belle II dataset that corresponds to an integrated luminosity of $8.7 \pm 0.2 fb^{-1}$. Each candidate is fully reconstructed with hadronic decay final states on the signal side, while the rest-of-event technique allows to infer the decay vertex position on the other (tag… |
BELLE2-CONF-PH-2020-003 | - | 2020-05-15 |
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14th annual Belle PAC Review meeting : Feb.10-12, 2020Public
B-factory Programme Advisory Committee Full summary report for the annual meeting on 10–12 February 2020 at KEK |
BELLE2-REPORT-2024-016 | - | 2020-05-11 |
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A calibration of the Belle II hadronic tag-side reconstruction algorithm with $B \rightarrow X\ell \nu$ decaysPublic
Tag-side reconstruction is an important method for reconstructing $B$ meson decays with missing energy. The Belle II tag-side reconstruction algorithm, Full Event Interpretation, relies on a hierarchical reconstruction of $B$ meson decays with multivariate classification employed at each stage of reconstruction. Given the large numbers of classifi… |
BELLE2-CONF-PH-2020-005 | - | 2020-05-08 |
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| Dark Photon Searches at B-FactoriesPublic | BELLE2-TALK-CONF-2020-023 | - | 2020-05-04 |
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Recent results on bottomonium from BellePublic
We present recent results on hadronic transitions between bottomonium states obtained by the Belle Collaboration. They include decays of the Upsilon(4S) into lower bottomonia with pi+pi-, eta and eta' transitions. Also discussed is the first observation of the Upsilon(10753) state using a large data sample collected near the Upsilon(10860) resonan… |
BELLE2-TALK-CONF-2020-024 | - | 2020-05-04 |
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Background evaluation at SuperKEKB and Belle IIPublic
The SuperKEKB asymmetric electron-positron collider is the upgrade of the KEKB machine and it is expected to achieve the instantaneous luminosity of $8times10^{35}$ cm$^{-2}$s$^{-1}$, 40 times higher than the record of KEKB. With the increased luminosity, the beam background is expected to grow significantly with respect to KEKB, leading, among ot… |
BELLE2-CONF-PROC-2020-008 | - | 2020-04-22 |
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Reconstruction of B0 -> J/ψKS0 and B+ -> J/ψK+Public
In this public note, we describe the reconstruction of the CP eigenstate of B0-> J/\psi K0S and its control sample of B+ -> J/\psi K+ using the data set taken from the 2019 runs recorded by the Belle II which corresponds to an integrated luminosity of 8.7 /fb. |
BELLE2-NOTE-PL-2020-004 | - | 2020-04-21 |
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Measurement of the branching fraction of $B^{0}\to D^{*-}l^{+}\nu_{l}$ with early Belle II dataPublic
We measure the branching fractions for the decays $B^{0}\to D^{*-}e^{+}\nu_{e}$ and $B^{*0}\to D^{*-}\mu^{+}\nu_{\mu}$ using the first $8.70 \pm 0.09 fb^{-}$ of data collected by the Belle II experiment at the SuperKEKB asymmetric-energy $e^+ e^-$ collider using the decays $D^{*+}\to D^0 \pi^+$ and $D^0\to K^-\pi^+$. |
BELLE2-CONF-PH-2020-002 | - | 2020-04-15 |
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Charmless B decay reconstruction in 2019 dataPublic
We report on the reconstruction of various charmless $B$ decays from electron-positron collisions at the energy corresponding to the $\Upsilon(4S)$ resonance collected with the Belle II detector at the SuperKEKB collider. We use simulation to devise optimized event selections and apply them to the full data set collected in 2019, corresponding to… |
BELLE2-CONF-PH-2020-001 | - | 2020-04-10 |
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Rediscovery of η and η' mesons in early phase 3 Belle II dataPublic
This note contains approved plots of rediscovery η and η' mesons decay with early phase 3 data, corresponding to an integrated luminosity \int Ldt = 5.18 fb −1 . More details on BELLE2-NOTE-PH-2018-038. |
BELLE2-NOTE-PL-2020-003 | - | 2020-04-06 |
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Plots for approval: Full Event Interpretation Reconstruction Performance with 8.7 fb$^{-1}$ of Phase III data in bucket 8 and proc 10.Public
This note presents hadronic FEI performance plots associated with the analysis work presented in BELLE2-NOTE-PH-2019-031 for approval made using proc 10 and bucket 8 data (8.7 fb$^{-1}$) of early phase III data. Plots include a comparison of the classifier output for the tag-side B mesons in data to the shape expected from simulation, fits to the … |
BELLE2-NOTE-PL-2020-002 | - | 2020-04-06 |
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Track Finding at Belle IIPublic
This paper describes the track-finding algorithm that is used for event reconstruction in the Belle II experiment operating at the SuperKEKB B-factory in Tsukuba, Japan. The algorithm is designed to balance the requirements of a high efficiency to find charged particles with a good track parameter resolution, a low rate of spurious tracks, and a r… |
BELLE2-PUB-TE-2020-001 | - | 2020-03-25 |
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Belle2VR: An Interactive Virtual Reality Visualization of GEANT4 Event HistoriesPublic
Belle2VR is a novel interactive virtual reality visualization of the Belle II detector at KEK and the animation therein of GEANT4-simulated event histories. The user, wearing a VR headset, manipulates a gamepad or hand controller(s) to interact with and interrogate the detailed GEANT4 event history over time, to adjust the visibility and transpare… |
BELLE2-CONF-PROC-2020-007 | - | 2020-03-13 |
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Dark Sector Searches at Belle IIPublic
The Belle II experiment at the SuperKEKB energy-asymmetric $e^+ e^-$ collider is a substantial upgrade of the B factory facility at the Japanese KEK laboratory. The design luminosity of the machine is $8\times 10^{35}$ cm$^{-2}$s$^{-1}$ and the Belle II experiment aims to record 50 ab$^{-1}$ of data, a factor of 50 more than its predecessor. Durin… |
BELLE2-TALK-CONF-2020-021 | - | 2020-03-12 |
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Selective background Monte Carlo simulation at Belle IIPublic
The Belle II experiment, beginning data taking with the full detector in early 2019, is expected to produce a volume of data fifty times that of its predecessor. With this dramatic increase in data comes the opportunity for studies of rare previously inaccessible processes. The investigation of such rare processes in a high data volume environment… |
BELLE2-CONF-PROC-2020-006 | - | 2020-03-05 |
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Belle II Pixel Detector Commissioning and Operational ExperiencePublic
The Belle II experiment at the Super Flavour Factory SuperKEKB in Tsukuba, Japan, has started regular operation with its final detector setup in spring 2019. The Belle II vertexing system consists of four layers of double sided silicon strips (SVD) and two layers of DEPFET pixel sensors (PXD). These inner most pixel layers are arranged at radii of… |
BELLE2-CONF-PROC-2020-011 | - | 2020-02-26 |
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Lepton identification in Belle II using observables from the electromagnetic calorimeter and precision trackersPublic
We present a major overhaul to lepton identification for the Belle II experiment, based on a novel multi-variate classification algorithm. Boosted decision trees are trained combining measurements from the electromagnetic calorimeter (ECL) and the tracking system. The chosen observables are sensitive to the different physics that governs interacti… |
BELLE2-CONF-PROC-2020-005 | - | 2020-02-24 |
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Dark Matter searches at Belle IIPublic
The Belle II experiment at the SuperKEKB energy-asymmetric 𝑒+𝑒− collider is a substantial upgrade of the B factory facility at the Japanese KEK laboratory. The design luminosity of the machine is 8×1035 cm−2s−1 and the Belle II experiment aims to record 50 ab−1 of data, a factor of 50 more than its predecessor. Main operation of SuperKEKB has star… |
BELLE2-TALK-CONF-2020-018 | - | 2020-02-24 |
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Beam background evaluation at SuperKEKB and Belle IIPublic
The SuperKEKB asymmetric electron-positron collider is the upgrade of the KEKB machine and it is expected to achieve the instantaneous luminosity of $8\times10^{35}$ cm$^{-2}$s$^{-1}$, 40 times higher than the record of KEKB. With the increased luminosity, the beam background is expected to grow significantly with respect to KEKB, leading, among o… |
BELLE2-TALK-CONF-2020-022 | - | 2020-02-24 |
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Belle II Status and Prospects @ Moscow International School of Physics 2020Public
At the end of 2018 the inner subdetectors, SVD (Silicon Vertex Detector) and PXD (Pixel Detector) were installed in Belle II. By the end of 2019 Belle II has collected a total of 10 fb$^{-1}$. With the early data taken the charged-particles tracking performance of the detector was characterized, reconstruction of known resonances and the capabilit… |
BELLE2-TALK-CONF-2020-013 | - | 2020-02-21 |
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