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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 張寶棣(Pao-Ti Chang) | |
| dc.contributor.author | Yu-Wei Chang | en |
| dc.contributor.author | 張育瑋 | zh_TW |
| dc.date.accessioned | 2021-06-16T13:36:33Z | - |
| dc.date.available | 2013-07-31 | |
| dc.date.copyright | 2013-07-26 | |
| dc.date.issued | 2013 | |
| dc.date.submitted | 2013-07-16 | |
| dc.identifier.citation | BIBLIOGRAPHY
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/62251 | - |
| dc.description.abstract | 作為標準模型的眾多延伸模型之一， 若系統含有一希格斯玻色子在樹圖的層次下只與向量玻色子耦合， 則此系統被人們稱做為fermiophobic希格斯玻色子模型。在這樣的基準模型下，若是希格斯玻色子的不變質量越低， 其衰變到兩個光子的分支比將會獲得越大幅度的增強， 因此雙光子衰變管道在此變成了適合用來尋找這種希格斯玻色子的黃金管道。
此分析在110到150GeV/c^2的搜尋範圍內尋找fermiophobic希格斯玻色子衰變到兩個光子的蹤跡， 目標事件的搜尋藉著基準模型的特性被更進一步地細分成數個不同的事件類型以增加分析的靈敏度。其中以兩個光子伴隨著兩個噴流的類別顯得特別重要， 因其主要的生成機制來自於向量玻色子的融合生成， 善加利用此機制的特性能在目標訊號及背景訊號的比率上得到非常好的成果。 此分析使用了緊湊緲子線圈偵測器所紀錄到的大強子對撞機於2011年在7TeV對撞質心能量下運轉時所產生的5.1 fb^-1之質子與質子的對撞資料， 與2012前半年在8TeV質心能量下所產生的5.3 fb^-1的對撞資料。在95%的信心水準下，不變質量由110到147GeV/c^2之fermiophobic希格斯玻色子都遭到排除。 | zh_TW |
| dc.description.abstract | As one of extensions of the Standard Model, a model in which a Higgs boson couples only to the vector bosons at tree level is referred to as a fermiophobic Higgs model. With this benchmark model, the branching ratio of h_f -> gamma gamma is much enhanced in the low Higgs mass region, and thus the diphoton decay channel becomes a golden channel.
In this analysis, the search for a fermiophobic Higgs boson decaying into 2 photons in the mass region 110–150 GeV/c^2 is reported. The event search is further divided into several event classes to improve the sensitivity based on the characteristic signature of the fermiophobic Higgs boson. The dijet tagged event class, which well exploits the signature of the Higgs boson from the Vector Boson Fusion production and has an excellent signal to background ratio in the search range, is a very important event class in this search. Using data correspond to an integrated luminosity of 5.1 fb^-1 at sqrt(s) = 7 TeV and of 5.3 fb^-1 at sqrt(s) = 8 TeV recorded by the Compact Muon Solenoid detector at the Large Hadron Collider in 2011 and 2012, a fermiophobic Higgs boson is excluded at 95% confidence level in the mass range 110–147 GeV/c^2. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-16T13:36:33Z (GMT). No. of bitstreams: 1 ntu-102-D97222017-1.pdf: 9468444 bytes, checksum: 70ba4df1564ea9654ead5f3639ce40e0 (MD5) Previous issue date: 2013 | en |
| dc.description.tableofcontents | CONTENTS
Abstract : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : i Acknowledgements : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : iii List of Contents : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : v List of Figures : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : ix List of Tables : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : xv 1. Introduction of Fermiophobic Benchmark Scenario : : : : : : : : : : : : : : : : : : : : : : 1 1.1 The Standard Model of Particle Physics . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.1.1 Gauge Field Theories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.1.2 The Higgs Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.2 Beyond the Standard Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 1.2.1 Two Higgs Doublet Models . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 1.3 The Fermiophobic Higgs in 2HDM . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 1.3.1 Searches for The Fermiophobic Higgs Boson in the Past . . . . . . . . . . . . 14 2. The LHC and CMS Experment : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 15 2.1 The Large Hadron Collider . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 2.2 The CMS Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 2.2.1 Superconducting Magnet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 2.2.2 Inner Tracking System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 2.2.3 Electromagnetic Calorimeter . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 2.2.4 Hadron Calorimeter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 2.2.5 Muon System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 2.2.6 Trigger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 3. Reconstruction of Physics Objects at CMS : : : : : : : : : : : : : : : : : : : : : : : : : : : 27 3.1 Reconstruction of Basic Objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 3.1.1 Track . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 3.1.2 Vertex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 3.1.3 ECAL Cluster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 3.1.4 HCAL Tower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 3.1.5 Standalone Muon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 3.2 Reconstruction of Physics Observables . . . . . . . . . . . . . . . . . . . . . . . . . . 32 3.2.1 Muon Reconstruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 3.2.2 Electron Reconstruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 3.2.3 Photon Reconstruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 3.3 Particle Flow Reconstruction Algorithm . . . . . . . . . . . . . . . . . . . . . . . . . 35 3.3.1 PF Jet Reconstruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 3.3.2 PF Missing Transverse Energy Reconstruction . . . . . . . . . . . . . . . . . 37 4. Analysis Method and Strategy : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 39 4.1 Rates and Cross Sections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 4.2 Datasets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 4.2.1 Data Samples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 4.2.2 Signal Monte Carlo Samples . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 4.2.3 Background Monte Carlo Samples . . . . . . . . . . . . . . . . . . . . . . . . 43 4.2.4 Pile-up Reweighting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 4.3 High Level Trigger Selections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 4.4 Vertex Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 4.4.1 Base Algorithms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 4.4.2 Combination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 4.5 Photon Energy Reconstruction and Identification . . . . . . . . . . . . . . . . . . . . 50 4.5.1 Photon Energy Reconstruction . . . . . . . . . . . . . . . . . . . . . . . . . . 51 4.5.2 Variables for Photon Identification . . . . . . . . . . . . . . . . . . . . . . . . 52 4.5.3 Photon Identification Selections . . . . . . . . . . . . . . . . . . . . . . . . . 55 4.6 Signal Extraction Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 4.6.1 Extended Unbinned Maximum Likelihood Method . . . . . . . . . . . . . . . 57 4.6.2 Signal Model Strategy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 4.6.3 Background Model Strategy . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 4.7 Statistical Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 4.7.1 Combination Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 4.7.2 Profile Likelihood Asymptotic Approximation . . . . . . . . . . . . . . . . . 60 4.7.3 p-value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 5. Common Systematic Uncertainties : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 63 6. Search for the Exclusive Di-jet Tag Subchannels : : : : : : : : : : : : : : : : : : : : : : : : 67 6.1 Analysis Strategy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 6.2 Jet Selection Variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 6.3 Optimization of Selection Criteria . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 6.3.1 Pile-up Jet Substraction Criteria in 2012 . . . . . . . . . . . . . . . . . . . . . 72 6.4 Signal and Background Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 6.4.1 Signal Modeling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 6.4.2 Background Modeling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76 6.5 Systematic Uncertainties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76 6.5.1 Signal Efficiency due to Photon ID and Reconstruction . . . . . . . . . . . . . 76 6.5.2 Signal Efficiency due to Jet Reconstruction . . . . . . . . . . . . . . . . . . . 76 6.5.3 Theoretical Uncertainties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 6.6 Results of the Di-jet Tag Selections . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82 6.6.1 Signal Yields . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82 6.6.2 Fitting Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82 6.6.3 Exclusion Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82 7. Search for the exclusive MET Tag Subchannel : : : : : : : : : : : : : : : : : : : : : : : : : 89 7.1 Analysis Strategy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89 7.2 Particle Flow Emiss_T Corrections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89 7.3 Optimization of the EBEB Category . . . . . . . . . . . . . . . . . . . . . . . . . . . 90 7.4 Event Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91 7.5 Signal and Background Modeling . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93 7.6 Systematic Uncertainty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94 7.7 Limit and Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95 8. Combined Result of Search for the Fermiophobic hf -> γγ Decays at CMS : : : : : : : : : 97 8.1 Description of Exclusive Lepton Tag Event Classes . . . . . . . . . . . . . . . . . . . 97 8.1.1 Event Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97 8.1.2 Analysis Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99 8.1.3 Fitted Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99 8.2 Description of Inclusive Event Classes . . . . . . . . . . . . . . . . . . . . . . . . . . 101 8.2.1 Event Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101 8.2.2 Analysis Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102 8.2.3 Fitted Results. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103 8.3 Combined Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104 8.3.1 Statistical Interpretation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104 8.3.2 Summary of 2011 Search . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104 8.3.3 Summary of 2012 Search . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106 8.3.4 Summary of the Combined Search of 2011+2012 . . . . . . . . . . . . . . . . 106 9. Conclusions : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 111 Appendix 113 A. Tables of Energy Scale and Energy Resolution Corrections : : : : : : : : : : : : : : : : : : 115 B. Summary Table of the Systematic Uncertainty : : : : : : : : : : : : : : : : : : : : : : : : : 121 Bibliography : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 131 | |
| dc.language.iso | en | |
| dc.subject | 高能粒子物理 | zh_TW |
| dc.subject | 緊湊緲子線圈偵測器 | zh_TW |
| dc.subject | 大強子對撞機 | zh_TW |
| dc.subject | CMS | en |
| dc.subject | HEP | en |
| dc.subject | LHC | en |
| dc.title | 尋找fermiophobic希格斯玻色子至兩個光子的衰變 | zh_TW |
| dc.title | Search for a Fermiophobic Higgs Boson Decaying into Two Photons at CMS | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 101-2 | |
| dc.description.degree | 博士 | |
| dc.contributor.oralexamcommittee | 李湘楠(Hsiang-Nan Li),王名儒(Min-Zu Wang),陳凱風(Kai-Feng Chen),侯維恕(Wei-Shu Hou),何小剛(Xiao-Gang He) | |
| dc.subject.keyword | 高能粒子物理,緊湊緲子線圈偵測器,大強子對撞機, | zh_TW |
| dc.subject.keyword | HEP,CMS,LHC, | en |
| dc.relation.page | 131 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2013-07-17 | |
| 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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| ntu-102-1.pdf 未授權公開取用 | 9.25 MB | Adobe PDF |
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