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Belle II Document Server
2,028
records found
620 - 629
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620.
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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621.
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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622.
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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623.
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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624.
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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625.
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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626.
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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627.
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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628.
Measurement of the branching fractions and CP asymmetries of B+ → π+π0 and B+ → K+π0 decays in 2019-2021 Belle II data
/
Thibaud Humair
;
Hans-Günther Moser
;
Justin Skorupa
[BELLE2-CONF-PH-2022-008]
19 September 2022
We determine the branching fractions B and CP asymmetries ACP of the decays B+ → π+π0 and B+ → K+π0. [...]
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629.
Semileptonic and rare decays at Belle II
/
Daniel Dorner
[BELLE2-CONF-PROC-2022-015]
19 September 2022
The Belle II collaboration presents their first measurements of the magnitude of the Cabibbo-Kobayashi-Maskawa matrix elements $|V_{cb}|$ and $|V_{ub}|$, as well as their first branching fraction measurement of $B\rightarrow K^*\ell^+\ell^-$ based on up to 189.26 fb$^{-1}$ of data collected at the $\Upsilon(4S)$ resonance. [...]
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