| Title▼ | Belle II Number▼ | Tags | Submit date▼ | Downloads |
|---|---|---|---|---|
|
Particle Identification in the Belle II DetectorPublic
I describe the Belle II / SuperKEKB project and the particle-identification strategies used in Belle II. (This is a repeat of my FCC-ee talk, with one more PID slide.) |
BELLE2-TALK-CONF-2021-009 | - | 2021-01-14 |
|
|
Detector simulation for a potential upgrade of the vertex detector of the Belle II experimentPublic
This presentation shows some of the work done for the potential upgrade of the vertex detector. It presents the tuning of the digitizer and the performances of the new geometries and CMOS technologies developed for the upgrade. |
BELLE2-TALK-CONF-2021-003 | - | 2021-01-07 |
|
|
Search for Axion-like Particles at Belle IIPublic
Search for Axion-like Particles produced in e+e- collisions at the Belle II experiment. PRL-published results obtained with early calibration & tuning 2018 data. |
BELLE2-TALK-CONF-2021-004 | - | 2021-01-07 |
|
|
Early Belle II measurements of the tau lifetimePublic
The tau-lepton lifetime represents a fundamental parameter within the Standard Model framework, contributing to the test of lepton flavor universality. As the present tau lifetime uncertainty is below 0.2%, a competitive measurement is particularly challenging. The method proposed for the Belle II experiment exploits the tiny beam spot size at the… |
BELLE2-TALK-CONF-2021-005 | - | 2021-01-07 |
|
|
Early charmless measurements at Belle IIPublic
The talk is about the early Belle II measurements of branching fractions, CP asymmetries and longitudinal polarizations in charmless B decays with 2019-2020 data. A sample size of 34.6/fb at the Upsilon(4S) resonance is used. The results are compatible with world averages and provide understanding of the detector performance and analysis tools. |
BELLE2-TALK-CONF-2021-002 | - | 2021-01-07 |
|
|
The Belle II experiment: first results, status, and prospectsPublic
Presented at EPIPHANY XXVII (07-10 January 2021). Overview plenary talk covering Belle II first results, status, and demonstrator analyses results. Key results that had targeted ICHEP2020 and published PRLs. |
BELLE2-TALK-CONF-2021-001 | - | 2021-01-07 |
|
|
The Belle II experiment and first physics resultsPublic
The Belle II experiment has recently started operations at the SuperKEKB e+e− collider, located at the KEK laboratory in Tsukuba (Japan). The unprecedented luminosity that it plans to collect in the next decade (50 ab−1) will allow Belle II to greatly exceed the precision achieved by the first generation of B- factory experiments (BaBar and Belle)… |
BELLE2-TALK-CONF-2020-073 | - | 2020-12-14 |
|
|
Early charmless B physics at Belle IIPublic
We report on the first measurements of branching fractions, CP-violating charge asymmetries, and longitudinal polarization fractions in charmless 𝐵 decays at the Belle II experiment. We use a sample of electron-positron collisions collected in 2019 and 2020 at the Υ(4𝑆) resonance that corresponds to 34.6 fb−1 of integrated luminosity. The results … |
BELLE2-CONF-PROC-2020-022 | - | 2020-12-13 |
|
|
Displaced vertex reconstruction at Belle II: approved plotsPublic
This note contains approved plots for displaced vertex reconstruction at Belle II, using an integrated luminosity of 72.05 fb. Details of the analysis are documented in the supporting physics note BELLE2-NOTE-PH-2020-072. |
BELLE2-NOTE-PL-2020-031 | - | 2020-12-11 |
|
|
Search for a long-lived scalar at Belle II: approved plots for Long-lived particles at Belle II WorkshopPublic
Approved plots for the search for a long-lived scalar particle in b->s decays. The plots show analysis selection variables for simulated background and signal samples, as well as the simulated displaced vertex reconstruction performance at Belle II. |
BELLE2-NOTE-PL-2020-030 | - | 2020-12-10 |
|
|
First Results on $V_{ub}$ and $V_{cb}$ with the Belle II experimentPublic
Precision measurements of $V_{ub}$ and $V_{cb}$ play a central role in tests of the CKM sector of the Standard Model and complement direct measurements of CP violation in B meson decays. In this talk, first studies for measuring $V_{ub}$ and $V_{cb}$ with semi-leptonic decays are presented using collision events recorded at the $\Upsilon(4S)$ r… |
BELLE2-CONF-PROC-2020-020 | - | 2020-12-03 |
|
|
Updates in Charmless B-Meson Decays at Belle IIPublic
We report on first measurement of branching fractions ($\mathcal{B}$) and $CP$ asymmetries ($\mathcal{A}$) in various charmless $B$ decays at Belle II. We utilize a data sample of 34.6 fb$^{-1}$ which is collected in SuperKEKB $e^{+}e^{-}$ collider at the $\Upsilon$(4S) resonance in 2019 and 2020. The analysis procedures, including the Monte Carlo… |
BELLE2-CONF-PROC-2020-019 | - | 2020-12-02 |
|
|
Search for Inelastic Dark Matter at Belle II: plots for approval for Long-lived particles at Belle II WorkshopPublic
Simulation results are presented for the ongoing analysis to search for inelastic Dark Matter (iDM) at Belle II. iDM features a Long-Lived Particle detector signature and an unconstrained parameter space that can be explored with the 2020/2021 Belle II dataset. This note outlines the current iDM selection and presents plots for approval showing … |
BELLE2-NOTE-PL-2020-029 | - | 2020-12-02 |
|
|
Irradiation Burst Studies on Belle II PXD Module ComponentsPublic
The Belle II detector started recording collision data in spring 2019. During physics runs, unexpected irradiation burst events occurred, which exposed the inner detectors and especially the PXD (PiXel Detector) to unwanted levels of prompt irradiation. Dedicated measurement campaigns were carried out at the Mainz Microtron (MAMI), which aimed to … |
BELLE2-MTHESIS-2022-037 | - | 2020-11-11 |
|
|
エアロジェルRICHのためのマルチアノード型HAPD光検出器の開発研究Public
高エネルギー加速器研究機構で行われている ファクトリー実験では、加速器のビーム強度を現在 の 倍に増加するアップグレードが計画されている。このアップグレードに伴い、高精度の 粒子識別装置の改善を目指し、前方エンドキャップに設置された閾値型 を にアップグレードすることが計画さ れている。これは 光を発生させる輻射体と、光検出器から構成される。 は光の検出位置から 放出角度の再構成を行い、 の識別を行う。 を 用いることで までの高運動量領域で 識別能力 を目指す。光検出器には以下のよ うな性能が必要とされる。 ・１光子検出能力 ・ 位置分解能 ・ 磁場耐性 ・広い有効面積 ・放射線耐性 これらの要請を満たす光検出器として我々は… |
BELLE2-MTHESIS-2021-047 | - | 2020-11-11 |
|
|
Study of 𝐵 → 𝜋^−ℓ^+𝜈_ℓ Decays Using Fully Reconstructed ϒ(4𝑆) → 𝐵 \bar 𝐵 Events at the Belle II ExperimentPublic
We present the results of a study of exclusively reconstructed 𝐵 → 𝜋^−ℓ^+𝜈_ℓ decays, where ℓ is an electron or a muon. Complementary 𝐵 meson is reconstructed using the Full Event Interpretation algorithm. We take a piece of MC as a data and using an independent second MC sample try to analyse the method and its implications. We then try to make an… |
BELLE2-MTHESIS-2021-070 | - | 2020-11-11 |
|
|
A novel method for tau-lepton lifetime measurement with early Belle II dataPublic
The Belle II experiment, operating at the SuperKEKB electron-positron collider, is going to collect 50/ab of integrated luminosity by 2030, a factor 50 more than its predecessors. The large cross section for tau pair production at the Y(4S) resonance energy, will yield to about 46 billion produced tau pairs, making Belle II, besides a B-factory, a… |
BELLE2-MTHESIS-2021-019 | - | 2020-11-11 |
|
|
Search for B → τν decay at the Belle II experimentPublic
This thesis project is divided into two parts. In the first part, the sensitivity of the Belle II experiment to the search for B → τ ν decays with a Monte Carlo simulated sample of 1 ab-1 is described. In the second part, it is studied the agreement of the MC simulation with data collected in 2019 corresponding to L = 8.86fb−1. |
BELLE2-MTHESIS-2023-009 | - | 2020-11-11 |
|
|
Measurement of the Flavor Changing Neutral Current Decays B → Kl+l− at the Belle II ExperimentPublic
Flavor Changing Neutral Currents (FCNC) constitute excellent probes for physics beyond the Standard Model, since their branching fractions can be affected by the presence of new, heavy particles as mediators. Of special interest are the B → Kl+l− decays—whereBiseitheraB0 oraB+ meson,KiseitheraK+ oraK0,andliseither a μ or an e— given their relative… |
BELLE2-PTHESIS-2021-012 | - | 2020-11-11 |
|
|
Real-Time Trigger and online Data Reduction based on Machine Learning Methods for Particle Detector TechnologyPublic
Modern particle accelerator experiments are producing immense amounts of data online during their operation. Storing the entire amount of generated data is quickly exceeding reasonable budgets for the data readout infrastructure. This problem is traditionally addressed by using a combination of trigger and data reduction mechanisms that are locate… |
BELLE2-PTHESIS-2021-015 | - | 2020-11-11 |
|