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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 裴思達(Stathes Paganis) | |
| dc.contributor.author | You-Ying Li | en |
| dc.contributor.author | 李侑穎 | zh_TW |
| dc.contributor.author | f04222020 | |
| dc.date.accessioned | 2022-11-23T09:12:44Z | - |
| dc.date.available | 2021-08-20 | |
| dc.date.available | 2022-11-23T09:12:44Z | - |
| dc.date.copyright | 2021-08-20 | |
| dc.date.issued | 2021 | |
| dc.date.submitted | 2021-08-12 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/79823 | - |
| dc.description.abstract | 此論文主要描寫藉由希格斯玻色子的雙光子衰變態中測量向量玻色子及希格斯玻色子共絆產生的截面積研究以及相關的背景知識，此測量使用從 2016 至 2018 年，藉由緊湊緲子螺線圈收集的質心能量 13 兆電子伏特的質子對撞事件，其總亮度達到 137 逆飛靶。分析策略採用”簡化型模板截面積“架構去提升向量玻色子及希格斯玻色子共絆產生的靈敏度，並提供此共絆產生的運動學結構之測量。這個架構根據不同的產生機制以及運動學去分割向量玻色子及希格斯玻色子共絆產生的截面積到不同的區域，同時，對撞事件也被區分成不同的類別去豐富這些類別所瞄準的區域，此外，每個類別也採用促進式決策樹去優化此共絆產生的靈敏度。經過對所有類別裡的雙光子不變質量的分佈進行最尖端的同步擬合後，測量到向量玻色子及希格斯玻色子共絆產生的訊號強度為 1.34^{+0.36}_{-0.33} ，一致的顯著度相對於背景達到 4.7 個標準差。另外，向量玻色子及希格斯玻色子共絆產生的截面積在不同的產生機制以及運動學也被測量，全部的結果符合標準模型的預測。 | zh_TW |
| dc.description.provenance | Made available in DSpace on 2022-11-23T09:12:44Z (GMT). No. of bitstreams: 1 U0001-0608202111424600.pdf: 24466482 bytes, checksum: 6be07332c472b5886f43331f348f65b7 (MD5) Previous issue date: 2021 | en |
| dc.description.tableofcontents | Introduction 1 Higgs boson and associated VH production 3 1.1 Standard Model 4 1.1.1 Particle 4 1.1.2 Interaction 7 1.2 Higgs mechanism 13 1.2.1 Spontaneous symmetry breaking and Higgs mechanism 14 1.2.2 Higgs mechanism in the Standard Model 16 1.2.3 Higgs hunting 20 1.3 Higgs boson at the LHC 22 1.3.1 Production of the Higgs boson at the LHC 23 1.3.2 Decay of the Higgs boson 25 1.3.3 What is next? 29 1.4 Associated VH production and STXS 31 2 The CMS experiment 36 2.1 Large hadron collider 36 2.1.1 Machine design 37 2.1.2 Luminosity and pileup 38 2.1.3 Proton injection and operational cycle 40 2.2 Compact muon solenoid 41 2.2.1 Coordinate system 42 2.2.2 Inner tracker system 43 2.2.3 Electromagnetic calorimeter 44 2.2.4 Hadron calorimeter 47 2.2.5 Solenoid magnet system 49 2.2.6 Muon detector 49 2.3 Trigger 52 2.3.1 Level-1 trigger 53 2.3.2 High Level Trigger 54 3 Event reconstruction and selection 55 3.1 Particle flow element 56 3.1.1 Inner track and vertex reconstruction 56 3.1.2 Calorimeter cluster reconstruction 58 3.2 Muon 60 3.2.1 Muon reconstruction 60 3.2.2 Muon identification and isolation 61 3.3 Photon and Electron 63 3.3.1 Photon/Electron reconstruction 64 3.3.2 Energy calibration 68 3.3.3 Diphoton vertex identification 69 3.3.4 Photon identification 72 3.3.5 Diphoton identification 75 3.3.6 Electron identification 77 3.4 Jet 77 3.4.1 Jet reconstruction 78 3.4.2 Jet identification 79 3.5 Missing energy 82 4 Event categorization 86 4.1 Categorization for the VH STXS stage 0 86 4.1.1 ZH Leptonic category 88 4.1.2 WH Leptonic category 89 4.1.3 VH MET category 96 4.1.4 VH Hadronic category 100 4.2 Multivariate analysis 106 4.2.1 Boost decision tree technique 108 4.2.2 VH Leptonic BDT 112 4.2.3 VH Hadronic BDT 118 4.3 Categorization for the VH STXS stage 1.2 124 4.3.1 Migration of the STXS stage 1.2 bins in the VH Leptonic categories 126 4.3.2 Analysis categories at the stage 1.2 129 5 Signal and background modelling 135 5.1 Signal modelling 135 5.2 Background modelling 136 5.3 Systematic uncertainties 141 5.3.1 Theoretical uncertainties 143 5.3.2 Experimental uncertainties 145 6 Results 148 6.1 Statistical methodology 149 6.2 Signal strength modifier 152 6.3 Simplified template cross sections 154 6.3.1 STXS at Stage 0 156 6.3.2 SXTS at Stage 1.2 156 Conclusion 162 A STXS results 164 Bibliography 166 | |
| dc.language.iso | en | |
| dc.subject | 簡化型模板截面積 | zh_TW |
| dc.subject | 大型強子對撞機 | zh_TW |
| dc.subject | 緊湊緲子螺線圈 | zh_TW |
| dc.subject | 標準模型 | zh_TW |
| dc.subject | 向量玻色子及希格斯玻色子 | zh_TW |
| dc.subject | 雙光子衰變 | zh_TW |
| dc.subject | diphoton | en |
| dc.subject | CMS | en |
| dc.subject | STXS | en |
| dc.subject | LHC | en |
| dc.subject | VH | en |
| dc.subject | Standard Model | en |
| dc.title | 在對撞能量十三兆電子伏特的緊湊渺子螺線圈實驗中透過希格斯玻色子的雙光子衰變態去測量向量玻色子及希格斯玻色子共伴產生之截面 | zh_TW |
| dc.title | Measurements of the associated VH production cross section in the H to γγ channel at sqrt(s) = 13 TeV in the CMS experiment | en |
| dc.date.schoolyear | 109-2 | |
| dc.description.degree | 博士 | |
| dc.contributor.oralexamcommittee | 陳凱風(Hsin-Tsai Liu),呂榮祥(Chih-Yang Tseng),張寶棣, 張敬民,郭家銘 | |
| dc.subject.keyword | 大型強子對撞機,緊湊緲子螺線圈,標準模型,向量玻色子及希格斯玻色子,雙光子衰變,簡化型模板截面積, | zh_TW |
| dc.subject.keyword | LHC,CMS,Standard Model,VH,diphoton,STXS, | en |
| dc.relation.page | 171 | |
| dc.identifier.doi | 10.6342/NTU202102141 | |
| dc.rights.note | 同意授權(全球公開) | |
| dc.date.accepted | 2021-08-13 | |
| dc.contributor.author-college | 理學院 | zh_TW |
| dc.contributor.author-dept | 物理學研究所 | zh_TW |
| 顯示於系所單位： | 物理學系 | |
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| U0001-0608202111424600.pdf | 23.89 MB | Adobe PDF | 檢視/開啟 |
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