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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 陳凱風(Kai-Feng Chen) | |
dc.contributor.author | Pei-Rong Yu | en |
dc.contributor.author | 余佩容 | zh_TW |
dc.date.accessioned | 2021-06-17T08:22:22Z | - |
dc.date.available | 2021-06-01 | |
dc.date.copyright | 2021-02-22 | |
dc.date.issued | 2021 | |
dc.date.submitted | 2021-02-08 | |
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/74160 | - |
dc.description.abstract | 本研究使用由緊湊渺子螺線圈偵測器收集之質心能量13兆電子伏特質子對撞資料,測量向量玻色子和希格斯粒子共伴產生下,希格斯粒子衰變至雙W玻色子後進一步衰變至輕子態之訊號強度。 從2016年至2018年質子對撞資料中累積光度至137逆飛靶恩的數據中,根據向量玻色子的種類和其衰變後之輕子數量,分成四個子分析後各別進行優化處理和雜訊估計,以達到最佳結果。 測量之訊號強度結果為$1.85^{+0.47}_{-0.44}$,其誤差範圍相對於粒子物理標準模型的理論預測略有差別 | zh_TW |
dc.description.abstract | Measurement of signal strength of the SM Higgs boson in proton-proton collisions at a center-of-mass energy √s =13 $\TeV$ are performed. With events contain the Higgs boson associating with vector boson decays into a pair of leptonic-decay W bosons, there are four final channels, WH2l, WH3l, ZH3l, and ZH4l, to handle the two, three, and four leptons final states respectively. The analysis is based on data collected by the CMS detector at the LHC in 2016, 2017, and 2018, and corresponds to an integrated luminosity of $137.1 \fbinv$. The total Higgs boson signal strength compared to the standard model prediction is measured to $1.85^{+0.47}_{-0.44}$. | en |
dc.description.provenance | Made available in DSpace on 2021-06-17T08:22:22Z (GMT). No. of bitstreams: 1 U0001-2501202118284400.pdf: 19561866 bytes, checksum: 643229af60b45cb11d78b2dd6603aa3d (MD5) Previous issue date: 2021 | en |
dc.description.tableofcontents | 1 Introduction 1 1.1 Overview of VH Channels 4 1.1.1 WH→3l+EmissT 4 1.1.2 ZH→4l+EmissT 5 1.1.3 ZH→3l+EmissT 6 1.1.4 WH→2l+EmissT 7 1.2 Thesis Organization 7 2 Theoretical Interpretation 9 2.1 Overview of the Standard Model 9 2.2 Gauge invariance and massless boson 14 2.3 The Higgs Mechanism 16 2.4 The Higgs Mechanism under the Standard Model 19 2.5 Higgs Production and Decay at LHC 23 3 Experimental Apparatus 26 3.1 The Large Hadron Collider 26 3.2 The Compact Muon Solenoidetector 32 3.2.1 Superconducting magnet 34 3.2.2 Tracking system 35 3.2.3 Electromagnetic calorimeter 38 3.2.4 Hadron calorimeter 40 3.2.5 Muon system 41 4 Physical Object Reconstruction 45 4.1 Particle Flow 45 4.2 Track Reconstruction 47 4.3 Vertex Reconstruction 47 4.4 Muon 48 4.5 Electron 50 4.6 Jets 52 4.7 b-jets 53 4.8 Missing Transverse Energy 55 5 Data and Monte Carlo Samples 57 5.1 Data and Triggers 57 5.2 MC Sample 58 6 Physical Object Selection 61 6.1 Muons 61 6.2 Electrons 63 6.3 Fake Estimation 65 6.4 Jets 66 6.5 B-tagging 67 6.6 Missing Transverse Energy 67 7 Analysis Strategy 68 7.1 Pre-selection and event categorization 71 7.2 BDT implementation in anlaysis 72 7.2.1 Multivariate Technique and Boosted Decision Tree 73 7.2.2 Gradient BDT parameter 78 7.2.3 BDT Input Variable and selection for BDT traning 79 7.2.4 BDT Distributions 80 7.2.5 BDT Result 88 8 Background Estimation 92 8.1 ZγControl Region 92 8.2 WZControl Region 94 8.3 Top-like Control Region from Fakes 101 9 Systematic Uncertainties 107 9.1 Description of Systematics 107 9.2 Implementation of Systematic Uncertainties 111 9.3 WH3l Systematics and Impacts 114 10 Result and Combination 118 10.1 WH3l Result 118 10.2 VH Combination 122 10.3 Event Yields 127 10.4 Posterior Kinematic Plots 130 11 Conclusion 134 A Preshower (ES) Alignment 137 A.1 Algorithm 140 A.2 Selection 142 A.2.1 Result and Validation 142 A.3 Alignment work in 2017 143 References 145 | |
dc.language.iso | en | |
dc.title | 在緊湊渺子螺線圈質心能量十三兆電子伏特中使用希格斯粒子衰變到雙輕子衰變態的W玻色子測量向量玻色子及希格斯粒子共伴產生之訊號強度 | zh_TW |
dc.title | Measurements of H→WW in VH production mode with leptonic decays at √s = 13 TeV in CMS experiment | en |
dc.type | Thesis | |
dc.date.schoolyear | 109-1 | |
dc.description.degree | 博士 | |
dc.contributor.oralexamcommittee | 裴思達(Stathes Paganis),呂榮祥(Rong-Shyang Lu),張寶棣(Pao-Ti Chang),郭家銘(Kuo Chia-Ming),何小剛(Xiao-Gang He) | |
dc.subject.keyword | 高能物理,粒子物理,高能實驗,緊湊渺子線圈,希格斯粒子, | zh_TW |
dc.subject.keyword | High energy physics,particle physics,CMS,LHC,Higgs boson,13 TeV, | en |
dc.relation.page | 148 | |
dc.identifier.doi | 10.6342/NTU202100163 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2021-02-14 | |
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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