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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/97231完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 王名儒 | zh_TW |
| dc.contributor.advisor | Min-Zu Wang | en |
| dc.contributor.author | 林偉哲 | zh_TW |
| dc.contributor.author | Wei-Che Lin | en |
| dc.date.accessioned | 2025-02-27T16:47:10Z | - |
| dc.date.available | 2025-02-28 | - |
| dc.date.copyright | 2025-02-27 | - |
| dc.date.issued | 2025 | - |
| dc.date.submitted | 2025-02-09 | - |
| dc.identifier.citation | [1] B.R.Martion and G.Shaw, Particle Physics, 4th Edition, John Wiley & Sons, Ltd, The Atrium, Southern Gate, Chichester, West Sussex, PO19 8SQ, United Kindom, 2017.
[2] M.Thomson, Modern Particle Physics, Cambridge University Press, University Print-ing House, Cambridge CB2 8BS, United Kindom, 2013. [3] S. Navas et al., Review of Particle Physics, Phys. Rev. D 110, 030001 (2024). [4] K. F. Chen et al., Measurement of branching fractions and polarization in B —> phi K(*) decays, Phys. Rev. Lett. 91, 201801 (2003). [5] T. Abe et al., Belle II Technical Design Report, KEK-REPORT-2010-1 (2010). [6] D. J. Lange, The EvtGen particle decay simulation package, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 462, 152 (2001), BEAUTY2000, Proceedings of the 7th Int. Conf. on B-Physics at Hadron Machines. [7] S. Patra and V. Bhardwaj, MC decay tagging using generated level information with GenMCTagTool, Technical Report BELLE2-NOTE-TE-2021-002, Belle II, 2021. [8] J.-H.Su, Particle Identification of K0L with ECL, Technical Report BELLE2-NOTE-TE-2024-006, Belle II, 2024. [9] M. Tanabashi et al., Review of Particle Physics, Phys. Rev. D 98, 030001 (2018). | - |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/97231 | - |
| dc.description.abstract | 本研究探討了 B 介子的潛在衰變模式 B0 → ϕ KL0。研究分析了積分亮度為 699.235 f b−1 的蒙地卡羅樣本，以模擬由 SuperKEKB 加速器產生的正子電子對碰撞事件。應用訓練過的多變量分析（MVA）分類器來有效區分 KL0 介子與背景噪音。而為了完成信號事件的重建，我們添加了特定的限制條件。在積分亮度為 365.29 f b−1下，我們得到的信號產量為137 ± 36。 | zh_TW |
| dc.description.abstract | This study investigates the potential decay mode B0 → ϕ KL0 of B mesons. The research analyzes 699.235 f b−1 Monte-Carlo samples to simulate e+ e− collisions produced by the SuperKEKB accelerator. A trained multivariate analysis ( MVA ) classifier is applied to effectively distinguish KL0 from background noise. Specific constraints are added to fulfill the reconstruction of signal events. The resulting signal yields are 137 ± 36 under luminosity 365.29 f b−1. | en |
| dc.description.provenance | Submitted by admin ntu (admin@lib.ntu.edu.tw) on 2025-02-27T16:47:10Z No. of bitstreams: 0 | en |
| dc.description.provenance | Made available in DSpace on 2025-02-27T16:47:10Z (GMT). No. of bitstreams: 0 | en |
| dc.description.tableofcontents | Verification Letter from the Oral Examination Committee i
誌謝 iii 摘要 v Abstract vii Contents ix List of Figures xiii List of Tables xv 1 Introduction 1 1.1 The Standard Model 1 1.2 Motivation 3 1.2.1 Mixing of neutral kaons 3 1.2.2 B0 → ϕ K0 decay 4 1.2.3 CP violation in interference 4 2 Belle II experiments 7 2.1 SuperKEKB accelerator 7 2.2 Pixel Detector (PXD) 9 2.3 Silicon Vertex Detector (SVD) 10 2.4 Central Drift Chamber (CDC) 10 2.5 Particle Identification (PID systems) 11 2.5.1 Time of Propagation (TOP) 11 2.5.2 Aerogel Ring-Imaging Cherenkov detector (ARICH) 11 2.6 Electromagnetic Calorimeter (ECL) 12 2.7 KL and Moun detector (KLM) 12 3 Event Selections 13 3.1 Monde-Carlo Samples 13 3.1.1 Signal Samples 13 3.1.2 Background Samples 13 3.2 Reconstruction and Selections 14 3.2.1 Reconstruction of ϕ 14 3.2.2 Reconstruction of KL0 15 3.2.3 Reconstruction of B0 15 4 Continuum Suppression 21 4.1 Training Variables 22 4.2 Best Candidate Selection 26 5 Signal Extraction 31 5.1 Fitting Strategy 31 5.2 PDF Modeling 35 5.3 Extended Maximum Likelihood Fit 36 5.4 Fitter Test 37 6 Conclusion 47 A Decay Table for the Generation of Signal MC 49 B Distribution of Continuum Suppression Training Variables 51 Bibliography 57 | - |
| dc.language.iso | en | - |
| dc.title | 以蒙地卡羅法尋找Belle ll實驗中B介子至ϕK_L^0介子之衰變事件 | zh_TW |
| dc.title | MC study for B0 → ϕK_L^0 decay at Belle ll | en |
| dc.type | Thesis | - |
| dc.date.schoolyear | 113-1 | - |
| dc.description.degree | 碩士 | - |
| dc.contributor.oralexamcommittee | 張寶棣;徐靜戈;張敏娟 | zh_TW |
| dc.contributor.oralexamcommittee | Pao-Ti Chang;Jing-Ge Shiu;Ming-Chuan Chang | en |
| dc.subject.keyword | Belle ll 實驗,B介子,B衰變,蒙地卡羅方法,超級B介子工廠,長命K介子, | zh_TW |
| dc.subject.keyword | Belle ll,B meson,B decay,Monde-Carlo method,SuperKEKB,K_0^L, | en |
| dc.relation.page | 58 | - |
| dc.identifier.doi | 10.6342/NTU202500482 | - |
| dc.rights.note | 同意授權(限校園內公開) | - |
| dc.date.accepted | 2025-02-10 | - |
| dc.contributor.author-college | 理學院 | - |
| dc.contributor.author-dept | 物理學系 | - |
| dc.date.embargo-lift | 2025-02-28 | - |
| 顯示於系所單位： | 物理學系 | |
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