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Belle II Document Server
2,051
records found
641 - 650
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641.
Construction and cosmic ray test of the inner chamber for Belle II CDC and test of readout electronics performance for the specific ionization measurement (in Japanese):(日本語原題)Belle II実験用CDCのInner chamberの製作・宇宙線テストと読み出しエレクトロニクスのエネルギー損失分解能の性能評価
/
Satsuki Minemura
;
Kenkichi Miyabayashi
;
Shoji Uno
[BELLE2-MTHESIS-2022-028]
Presented on 07 03 2014
MSc
2014
Nara Women's University
/ Nara
Belle II実験の中央飛跡検出器(CDC)のinner chamberを製作し宇宙線テストにより設計通り動作することを確認した。また、ガス中を荷電粒子が通過中のエネルギー損失を測定する信号読み出し電子回路の特性を評価し、要求性能を満たすことを確認した。
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642.
Construction of the PIN-PD current monitor system for Belle II electromagnetic calorimeter (in Japanese):(日本語原題)Belle II 実験電磁カロリメーター用PIN-PD バイアス電源モニターシステムの構築
/
Chiho Arai
;
Kenkichi Miyabayashi
[BELLE2-MTHESIS-2022-027]
Presented on 29 02 2016
MSc
2016
Nara Women's University
/ Nara
Belle II実験の電磁カロリメーターでCsI(Tl)シンチレーターの発光を読み出すPINフォトダイオードの電流値をモニターすることは、ビームバックグラウンドによる放射線被曝量を算出するデータとして重要である。逆バイアス電源とPINフォトダイオードの間に適切な抵抗を挿入してその電圧降下を測定するための低雑音・高入力インピーダンスの計測アンプを試作し、要求性能を満たすこと、計測アンプが出力する電圧信号をデータロガーでデジタル化するサイクルが動作中に電磁カロリメーターのCsI(Tl)カウンター信号に雑音の増加はないことを確認した。
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643.
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
/
Sae Yokoyama
;
Kenkichi Miyabayashi
[BELLE2-MTHESIS-2022-026]
Presented on 08 03 2017
MSc
2017
Nara Women's University
/ Nara
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。
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644.
Estimation of wrong flavor tag fraction and Δt resolution by B0 → J/ψK∗0(→ K+π−) mode at Belle II(in Japanese):(日本語原題)Belle II 実験におけるB0 → J/ψK∗0(→ K+π−)モードを用いたフレーバー誤認率とΔt 分解能の評価
/
Aimi Kusudo
;
Kenkichi Miyabayashi
[BELLE2-MTHESIS-2022-025]
Presented on 10 02 2022
MSc
2022
Nara Women's University
/ Nara
B0 → J/ψK∗0(→ K+π−)モードのシミュレーション事象サンプルを用いて、フレーバータグ誤認率を調べ、effective tagging efficiencyを0.3220±0.0020と得た。分解能をtriple Gaussianで表現するモデルを用いてΔt分布をフィットして得たBメソン寿命は1.532 ± 0.004 psで、入力値と無矛盾であることから問題になるバイアスはないことを確かめた。
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645.
Measurement of beam background at the Belle II electromagnetic calorimeter during 2021 operation (in Japanese):(日本語原題)Belle II 実験の2021年運転期間における電磁カロリメーターでのビームバックグラウンド測定
/
Tsukasa Konno
;
Kenkichi Miyabayashi
[BELLE2-MTHESIS-2022-024]
Presented on 10 02 2022
MSc
2022
Nara Women's University
/ Nara
Belle II実験の電磁カロリメーターでCsI(Tl)シンチレーターの発光を読み出すPIN-PD電流モニターのデータを解析し、2021年3月〜6月の運転期間中の放射線被曝はバレル部の前方で0.20 Gy~0.25 Gy、後方で0.33 Gy~0.39 Gy、後方エンドキャップ部の外側で0.40 Gy~0.55 Gy、内側で0.73 Gy~1.02 Gy と算出した。
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646.
Measurements of charm lifetimes at Belle II
/
Nisar Nellikunnummel
[BELLE2-CONF-PROC-2022-017]
21 September 2022
We report on absolute lifetime measurements of charmed hadrons using the data collected by the Belle II experiment between 2019 and 2021. [...]
Revised on 2 November 2022:
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647.
Study of Exclusive $B \to \pi e^+ \nu_e$ Decays with Hadronic Full-event-interpretation Tagging in 189.3 fb$^{-1}$ of Belle II Data
/
Nadia Toutounji
;
Moritz Bauer
;
Pablo Goldenzweig
;
Kevin Varvell
[BELLE2-CONF-PH-2022-008]
16 June 2022
We present a reconstruction of the semileptonic decays $B^0 \to \pi^- e^+ \nu_e$ and $B^+ \to \pi^0 e^+ \nu_e$ in a sample corresponding to 189.3 fb$^{-1}$ of Belle II data, using events where the partner $B$-meson is reconstructed from a large variety of hadronic channels via a tagging algorithm known as the full-event-interpretation. [...]
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648.
Displaced track finding efficiency and detecting new long-lived particles at Belle II
/
Daniel Marcantonio
;
Phillip Urquijo
[BELLE2-MTHESIS-2022-023]
Presented on 11 11 2020
MSc
2020
The University of Melbourne
/ Melbourne
There are numerous extensions to the Standard Model that introduce new particles that have long lifetimes, corresponding to a flight length of centimetres or more in a particle collider. [...]
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649.
Measurement of the branching fraction for the decay $B \to K^{\ast}(892)\ell^+\ell^-$ at Belle II
/
Seema Choudhury
[BELLE2-CONF-PH-2022-009]
20 September 2022
We report a measurement of the branching fraction of $B \to K^{\ast}(892)\ell^+\ell^-$ decays, where $\ell^+\ell^- = \mu^+\mu^-$ or $e^+e^-$, using electron-positron collisions recorded at an energy at or near the $\Upsilon(4S)$ mass and corresponding to an integrated luminosity of $189$ fb$^{-1}$ [...]
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650.
Hadronic $B$ decays at Belle II
/
Sebastiano Raiz
[BELLE2-CONF-PROC-2022-016]
19 September 2022
We report on recent measurements of hadronic $B$ decays using the data set collected from 2019 to 2021 by the Belle~II experiment and corresponding to an integrated luminosity of 189.8 ${\rm fb^{-1}}$. [...]
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