| Title▼ | Belle II Number▼ | Tags | Submit date▼ | Downloads |
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Plans for exotic bottomonium-like states at Belle IIPublic
{Large mass, non-relativistic dynamics, large energy level spacing and clear experimental signature are unique characteristics of the bottomonium states that make this sector so rich with a wide range of opportunities for new studies, ranging from the the spin structure of QCD to the extensions of the standard model Lagrangian, from the non-$q\bar… |
BELLE2-CONF-PROC-2017-034 | - | 2017-12-14 |
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Belle II Experiment: Status and UpgradePublic
The Belle II experiment at the asymmetric e^+ e^− SuperKEKB collider will start its operation in 2018 and will collect the data at the integrated luminosity of 50ab^−1 . This high luminosity will shed light on new physics beyond the Standard Model via high precision measurements of heavy flavor decays and searches for rare signal events. In this w… |
BELLE2-CONF-PROC-2017-035 | - | 2017-12-14 |
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Radiative and Electroweak Penguin B decays at Belle IIPublic
The radiative and electroweak penguin $B$ decays proceed via one-loop diagram and are sensitive to new physics. Recently LHCb reported two anomalies in $B \to K^{(*)} \ell^+ \ell^-$ decays; One is the angular observables P5' with 3.4$\sigma$ significance which suggests $C_9^{\rm NP} = -1, and the other is lepton flavor non-universality in low … |
BELLE2-TALK-CONF-2017-106 | - | 2017-12-14 |
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Dark Sector Physics with Belle IIPublic
The next-generation B-factory experiment Belle II at SuperKEKB will start physics data taking in 2018. SuperKEKB is an asymmetric e+e- collider that will operate with 40 times of the instantaneous luminosity of its predecessor, KEKB. Belle II/SuperKEKB aims to collect 50 times more data compared to Belle/KEK. Belle II offers the possibility to sea… |
BELLE2-TALK-CONF-2018-003 | - | 2017-12-11 |
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Prospects of semi-leptonic B decays and CKM parameters from B decays with the Belle II experimentPublic
A range of flavour physics observables show tensions with their corresponding Standard Model expectations: measurements of semi-leptonic flavour-changing neutral current processes and ratios of semi-leptonic tree-level decays involving τ and light leptons show both deviations of the order of four standard deviations. If confirmed, both would be an… |
BELLE2-TALK-CONF-2018-002 | - | 2017-12-11 |
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Measurement of beam background in phase-1 operation of SuperKEKB electron-positron collider (in Japanese):（日本語原題）SuperKEKB電子・陽電子衝突型加速器の第１期試験運転におけるビームバックグラウンド測定Public
SuperKEKB 加速器のビーム衝突点付近にシンチレーション検出器を2個設置して、2016 年2 月から6 月にかけて行われたPhase-1 試験運転で、電子ビームのみ電流値480 mAで蓄積して鉛直方向のビームサイズ50ミクロンに絞った状況ではタウ シェック散乱由来のバックグラウンドの割合が76.6±1.7 %であることを示した。 |
BELLE2-MTHESIS-2022-026 | - | 2017-11-11 |
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Study of multivariate techniques in the search of the decay channel $B^{0} \rightarrow D^{-}\pi{-}\mu^{+}\mu^{+}$ at the Belle II experimentPublic
In this work, we apply and compare three different multivariate classification methods based on machine learning techniques in order to study the decay channel B 0 → D − π − μ + μ + in the Bell II experiment, located in the B-factory SuperKEKB. In this channel the total lepton number L is violated by two units, ∆L = 2. Up to now, there is no exper… |
BELLE2-MTHESIS-2018-004 | - | 2017-11-11 |
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Preparing for Success Search for a Heavy Non-qqbar Meson in Y(6S) Decays at Belle IIPublic
While qqbar mesons and qqq baryons are ubiquitous in particle physics, the higher order qqqbarqbar mesons and qqqqq baryons are rarely seen, despite being completely allowed by quantum chromodynamics. In 2016, an analysis using data collected with the Belle detector at the KEKB asymmetric e+e- collider found evidence for a qqqbarqbar meson of 1061… |
BELLE2-MTHESIS-2020-005 | - | 2017-11-11 |
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Belle II 実験Aerogel RICH 検出器のための光検出器制御システムの開発Public
高エネルギー加速器研究機構で行われるBelle II 実験は、前身のBelle 実験に比べ50 倍もの積分 ルミノシティでの大統計を用いて標準模型を超える新物理現象の探索を行う実験である。Belle II 検 出器は7 つの検出器から成り、Aerogel RICH(Ring Imaging CHerenkov、ARICH) 検出器はBelle II 実験において、エンドキャップ部における荷電=K 中間子の識別を担う。ARICH 検出器は輻射 体であるエアロゲルと光検出器HAPD(Hybrid Avalanche Photo Detector) の2 層構造になってお り、荷電粒子が輻射体を通過する際に円錐状に発生するチェレンコフ光を後段のHAPD で2 次元の リングイメージとして観測し、… |
BELLE2-MTHESIS-2021-033 | - | 2017-11-11 |
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Development and performance of the track finder for the Belle II Vertex DetectorPublic
Belle II is the general purpose detector that will be operated at the second generation B-Factory SuperKEKB and it is currently in an advanced construction stage in KEK (Japan). SuperKEKB is a high luminosity asymmetric e^+e^- collider (peak luminosity up to 8 X 10^35 cm^-2s^-1), with the center-of-mass energy tuned on the peak of the Y(4S) resona… |
BELLE2-MTHESIS-2018-001 | - | 2017-11-11 |
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Belle II 実験ARICH 用光検出器のためのモニターシステムの開発Public
Belle II 実験は茨城県つくば市にある高エネルギー加速器研究機構(KEK) にて建設中である電 子・陽電子衝突型加速器SuperKEKB を用いた大規模素粒子実験で2018 年開始予定である。現 在までに理解されている標準理論を超えた物理で予言される新粒子を直接生成してその性質を調 べるエネルギーフロンティア実験に対し、Belle II 実験はB 中間子などの稀崩壊を大量に観測す ることにより間接的に新物理を探索するルミノシティフロンティア実験と呼ばれ、ここでは新物 理の寄与は標準模型との「差異」として現れると考えられる。前身のBelle 実験では新物理探索 に不十分であった稀崩壊事象の統計量をBelle II 実験では50 倍の統計量と共に測定器の精度向 上によって、この「差異」を… |
BELLE2-MTHESIS-2021-034 | - | 2017-11-11 |
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Feasibility study of ghost hits reduction in Silicon Vertex Detector for Belle II experimentPublic
Belle II experiment is a next generation B-factory that is aimed to study many excit- ing and intriguing topics in the research of New Physics, located in Tsukuba, Japan. It is expected to collect around 50 times more data than its predecessor, Belle, mostly thanks to 40 times higher luminosity provided by SuperKEKB over the original KEKB accelera… |
BELLE2-MTHESIS-2021-058 | - | 2017-11-11 |
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Measurement of the performance of the photodetectors for Belle II ARICH and the development of the evaluation method with cosmic raysPublic
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BELLE2-MTHESIS-2017-004 | - | 2017-11-11 |
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| Study for deformation of Belle II SVD ladders due to detector coolingPublic | BELLE2-MTHESIS-2017-005 | - | 2017-11-11 |
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Design and Simulation of Beam-Background Monitors in the Vicinity of the Electromagnetic Calorimeter for the Belle II ExperimentPublic
The upgrade of the KEKB to the SuperKEKB accelerator is being followed by the update of the Belle detector to the Belle II detector. The design instantaneous luminosity of SuperKEKB is 8$\cdot$10$^{35}$~cm$^{-2}$s$^{-1}$, forty times higher than that at KEKB. The new high-luminosity environment will bring an increase in the beam background. Due to… |
BELLE2-MTHESIS-2017-007 | - | 2017-11-11 |
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Measurement of the time dependent asymmetry in the decay $B^{0} \longrightarrow K_{S}^{0} \pi^{0} \gamma$ using the Silicon Vertex Detector of the Belle II experimentPublic
My thesis work is in the context of the Belle II experiment, a new generation of B factories that is currently in construction in Tsukuba (Japan) at the KEK laboratory. It is placed on the $e^{+} e^{-}$ accelerator machine SuperKEKB, which is planned to achieve the highest instant luminosity ever obtained, $\mathcal{L} = 8\cdot 10^{35} cm^{-2} s^{… |
BELLE2-MTHESIS-2017-011 | - | 2017-11-11 |
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Material Budget Studies for the Belle-II Detector Public
The Belle II experiment at the KEK laboratory in Tsukuba, Japan is currently undergoing commissioning, with first physics data anticipated in 2018. Understanding the material distribution of detector components is of critical importance for precision $e^+e^-$ collider experiments like Belle II, as the density and distribution of this material impa… |
BELLE2-MTHESIS-2017-012 | - | 2017-11-11 |
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Studies to determine the branching ratio f+- of the decay Y(4S) -> B+B-Public
(none) |
BELLE2-UTHESIS-2018-003 | - | 2017-11-11 |
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Characterisation of the Final Components of the Belle II Pixel Detector and Energy Calibration using Source MeasurementsPublic
In this master’s thesis, the final iterations of the matrix and chips were for the first time tested together in preparation of the module mass production. A set of four characterisation scans was performed, finding parameter spaces for the matrix voltages, the digitisation process, the chips’ communication and for sending the data off the module.… |
BELLE2-MTHESIS-2022-021 | - | 2017-11-11 |
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Measurement of the branching fraction f00: Y(4S) -> B0 B0barPublic
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BELLE2-UTHESIS-2018-004 | - | 2017-11-11 |
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