請用此 Handle URI 來引用此文件：
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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 王名儒(Win-Zu Wang) | |
| dc.contributor.author | Pei-Cheng Lu | en |
| dc.contributor.author | 盧沛成 | zh_TW |
| dc.date.accessioned | 2021-05-15T17:56:50Z | - |
| dc.date.available | 2015-07-01 | |
| dc.date.available | 2021-05-15T17:56:50Z | - |
| dc.date.copyright | 2014-07-09 | |
| dc.date.issued | 2014 | |
| dc.date.submitted | 2014-06-24 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/5360 | - |
| dc.description.abstract | 我們使用了日本筑波KEK之B工廠於1998至2010年間收集之771.581百萬BBbar介子對實驗數據。我們量測了B0衰變至η K+ π-三體末態的CP對稱破壞以及各中間態之衰變分支比，藉由Dalitz分析，能夠更清楚完整地了解此衰變的結構。此量測不考慮魅夸克中間態，只聚焦於底夸克至奇夸克的轉換，亦即稀有衰變的部分。至於η的衰變末態，我們只考慮了η → γγ 和 η → π+π-π0。
考慮所有中間態，在η → γγ此分支中，我們量測到的CP對稱破壞為-0.049^{+0.053}_{-0.052}+-0.046，在η → π+π-π0分支則為0.220^{+0.088}_{-0.084}+-0.040$，第一個誤差為統計誤差，第二個則是系統誤差。各中間態的衰變分支比量測結果可在此論文中見到。 | zh_TW |
| dc.description.abstract | We are going to determine the CP asymmetries and to measure branching fractions by Dalitz analysis for the three-body charmless hadronic B decay: B0 → η K+ π-; the branches η → γγ and η → π+π-π0 are considered. This work is based on a data sample of 771.581 million BBbar pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric energy
electron-positron collider. The measured branching fraction for all intermediate states are reported, we also measured Acp of inclusive charmless decay B0 → η(γγ) K+ π- = -0.049^{+0.053}_{-0.052}+-0.046 and that of B0 → η(π+π-π0) K+ π- = $0.220^{+0.088}_{-0.084}+-0.040$, the first error is statistical error and the second one is systematic error. | en |
| dc.description.provenance | Made available in DSpace on 2021-05-15T17:56:50Z (GMT). No. of bitstreams: 1 ntu-103-R99222043-1.pdf: 9625477 bytes, checksum: 50cc0f92872dc350439b48f560e86e0c (MD5) Previous issue date: 2014 | en |
| dc.description.tableofcontents | 1 Introduction 1
1.1 Motivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 Standard Model . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.2.1 Mesons . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.2.2 Exotic Mesons . . . . . . . . . . . . . . . . . . . . . . . 5 1.2.3 B Physics . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1.2.4 The Cabibbo-Kobayashi-Maskawa Matrix . . . . . . . . . 8 1.2.5 CP violation . . . . . . . . . . . . . . . . . . . . . . . . 9 1.3 Dalitz plot analysis . . . . . . . . . . . . . . . . . . . . . . . . . 11 2 Belle Experiment 13 2.1 KEKB B-Factory . . . . . . . . . . . . . . . . . . . . . . . . . . 14 2.2 BELLE Detector . . . . . . . . . . . . . . . . . . . . . . . . . . 15 2.2.1 Beam-line Magnets near the IP and Beam Pipe . . . . . . 17 2.2.2 Extreme Forward Calorimeter (EFC) . . . . . . . . . . . 21 2.2.3 Silicon Vertex Detector (SVD) . . . . . . . . . . . . . . . 22 2.2.4 Central Drift Chamber (CDC) . . . . . . . . . . . . . . . 24 2.2.5 Aerogel Čerenkov Counter System (ACC) . . . . . . . . . 25 2.2.6 Time-of-Flight Counters (TOF) . . . . . . . . . . . . . . 28 2.2.7 Electromagnetic Calorimeter (ECL) . . . . . . . . . . . . 29 2.2.8 Particle Identification of Electrons and Charged Kaons, EID and KID . . . . . . . . . . . . . . . . . . . . . . . . 31 2.2.9 KL and Muon Detection System (KLM) . . . . . . . . . . 32 3 B Reconstruction and Event Selection 35 3.1 Charged Particle Selection . . . . . . . . . . . . . . . . . . . . . 35 3.2 η Reconstruction . . . . . . . . . . . . . . . . . . . . . . . . . . 37 3.3 Best Candidate Selection . . . . . . . . . . . . . . . . . . . . . . 38 3.4 The Modified Mbc . . . . . . . . . . . . . . . . . . . . . . . . . . 39 3.5 Selections Summary . . . . . . . . . . . . . . . . . . . . . . . . 40 4 Background Study 45 4.1 Overview of Backgrounds Study . . . . . . . . . . . . . . . . . . 45 4.2 Continuum Background . . . . . . . . . . . . . . . . . . . . . . . 45 4.2.1 ΔZ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 4.2.2 cosθB . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 4.2.3 Kakuno Super Fox-Wolfram(KSFW) . . . . . . . . . . . 46 4.2.4 Fisher Discriminant . . . . . . . . . . . . . . . . . . . . . 48 4.2.5 Likelihood Ratio(LR) . . . . . . . . . . . . . . . . . . . . 50 4.2.6 Optimization of LR cut . . . . . . . . . . . . . . . . . . . 50 4.3 Generic B Background . . . . . . . . . . . . . . . . . . . . . . . 52 4.4 Rare B Background . . . . . . . . . . . . . . . . . . . . . . . . . 52 4.5 Feedacross Background . . . . . . . . . . . . . . . . . . . . . . . 54 5 Control Sample Study 57 5.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 5.2 Fitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 5.3 Calibration Factor Results . . . . . . . . . . . . . . . . . . . . . 61 5.4 η Selection Check . . . . . . . . . . . . . . . . . . . . . . . . . . 65 6 Amplitude Analysis on Dalitz Plot 69 6.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 6.2 Three-Body Signal Yields . . . . . . . . . . . . . . . . . . . . . . 69 6.3 Signal Amplitude Formalism . . . . . . . . . . . . . . . . . . . . 75 6.3.1 LASS Parametrization . . . . . . . . . . . . . . . . . . . 77 6.4 Efficiency over Dalitz Plot and Smearing . . . . . . . . . . . . . 78 6.5 Sideband Background Modeling . . . . . . . . . . . . . . . . . . 81 6.6 Dalitz Plot Boundary . . . . . . . . . . . . . . . . . . . . . . . . 83 6.7 Fitting and Goodness-of-Fit . . . . . . . . . . . . . . . . . . . . . 84 6.8 Fit Strategy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86 7 Systematics and Efficiency Correction 87 7.1 Tracking uncertainty . . . . . . . . . . . . . . . . . . . . . . . . 87 7.2 PID Identification Uncertainty . . . . . . . . . . . . . . . . . . . 87 7.3 Number of B ‾B pairs uncertainty . . . . . . . . . . . . . . . . . . 89 7.4 Signal PDF(ΔE, Mbc) uncertainty . . . . . . . . . . . . . . . . . 89 7.5 Rare B PDF uncertainty . . . . . . . . . . . . . . . . . . . . . . . 89 7.6 MC efficiency uncertainty . . . . . . . . . . . . . . . . . . . . . 90 7.7 η efficiency correction and systematics . . . . . . . . . . . . . . . 90 7.8 π0 efficiency and systematic error . . . . . . . . . . . . . . . . . 90 7.9 LR cut uncertainty . . . . . . . . . . . . . . . . . . . . . . . . . 91 7.10 Reconstruction Efficiency . . . . . . . . . . . . . . . . . . . . . 91 8 Summary and Conclusion 95 8.1 Fitting Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95 8.2 Floating Background . . . . . . . . . . . . . . . . . . . . . . . . 106 8.3 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106 8.4 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106 A Bias of 2D (ΔE, Mbc) fit 109 B Bias of Dalitz fitter 111 C Figures of Dalitz Plot Sideband Modeling 121 D Dalitz analysis Backup 127 E Results of Inclusive Decay 133 | |
| dc.language.iso | en | |
| dc.title | B介子衰變至η K π之Dalitz分析 | zh_TW |
| dc.title | Dalitz Analysis of Three-body Charmless Hadronic decay B to η K π | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 102-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 張寶棣(Pao-Ti Chang),王正祥(Chung-Hsiang Wang),徐靜戈(Jing-Ge Shiu) | |
| dc.subject.keyword | B介子,貝爾實驗,三體衰變,稀有衰變,Dalitz分析, | zh_TW |
| dc.subject.keyword | B meson,Belle,Three-body decay,Rare decay,Dalitz plot analysis, | en |
| dc.relation.page | 138 | |
| dc.rights.note | 同意授權(全球公開) | |
| dc.date.accepted | 2014-06-25 | |
| dc.contributor.author-college | 理學院 | zh_TW |
| dc.contributor.author-dept | 物理研究所 | zh_TW |
| 顯示於系所單位： | 物理學系 | |
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