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Belle II Document Server

2,011 records found  604 - 613  jump to record:

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604.	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。 Fulltext: PDF; Detailed record - Similar records
605.	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。 Fulltext: PDF; Detailed record - Similar records
606.	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: PDF; Detailed record - Similar records
607.	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. [...] Fulltext: PDF; Detailed record - Similar records
608.	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. [...] Fulltext: PDF; Detailed record - Similar records
609.	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$^{-1}$ [...] Fulltext: PDF; Detailed record - Similar records
610.	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 ${\rm fb^{-1}}$. [...] Fulltext: PDF; Detailed record - Similar records
611.	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. [...] Fulltext: PDF; Detailed record - Similar records
612.	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. [...] Fulltext: PDF; Detailed record - Similar records
613.	Search for B→Kνν decays with a machine learning method at the Belle II experiment / Cyrille Praz ; Alexander Glazov [BELLE2-PTHESIS-2022-010] Presented on 23 08 2022 PhD 2022 DESY / Hamburg (Germany) This thesis documents a search for the rare decay of a B meson into a K meson and a pair of neutrinos at the Belle II experiment, which is located along the SuperKEKB energy-asymmetric electron-positron collider. [...] Fulltext: PDF; Detailed record - Similar records

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