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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 | Yi-Jhih Yang | en |
dc.contributor.author | 楊宜知 | zh_TW |
dc.date.accessioned | 2021-06-17T07:41:17Z | - |
dc.date.available | 2019-02-20 | |
dc.date.copyright | 2019-02-20 | |
dc.date.issued | 2019 | |
dc.date.submitted | 2019-02-14 | |
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[2] J.A. Aguilar-Saavedra, ”Top flavor-changing neutral interactions: theoretical expectations experimental detection”, Acta Phys.Polon. B35, 2695–2710 (2004). [3] The CMS collaboration, ”Search for top quark decays via Higgs-boson-mediated flavor-changing neutral currents in pp collisions at √s = 8 TeV”, JHEP 02, 079 (2017). [4] F. Marcastel, CERN Technical Report, No. OPEN-PHO-CHART-2013-001 (2013). [5] ”CMS Detector”, https://cms.cern/detector. [6] CMS Collaboration, ”The CMS experiment at the CERN LHC”, JINST 3, S08004 (2008). [7] CMS Collaboration, ”Measurements of Higgs boson properties in the diphoton decay channel in proton-proton collisions at √s = 13 TeV”, JHEP 11, 185 (2018). [8] CMS Collaboration, ”Performance of the CMS muon detector and muon reconstructionwith proton-proton collisions at √s = 13 TeV”, JINST 13, P06015 (2018). [9] Matteo Cacciari et al, ”The anti-kt jet clustering algorithm”, JHEP04, 063 (2008). [10] The CMS Collaboration, ”Identification of b quark jets at the CMS Experiment in the LHC Run 2”, CMS PAS BTV-15-001. [11] Glen Cowan, Kyle Cranmer, Eilam Gross, Ofer Vitells, ”Asymptotic formulae for likelihood-based tests of new physics”, Eur.Phys.J.C71,1554 (2011) [12] The CMS Collaboration, ”CMS luminosity measurements for the 2016 data-taking period”, CMS PAS LUM-17-001. [13] J. Gao et al., ”CT10 next-to-next-to-leading order global analysis of QCD”, Phys.Rev. D89, no. 3, 033009 (2014). [14] P. D. Dauncey, M. Kenzie, N. Wardle, and G. J. Davies, ”Handling uncertainties in background shapes: the discrete profiling method”, JINST 10, P04015 (2015). [15] The CMS collaboration, ”Search for the flavor-changing neutral current interactions of the top quark and the Higgs boson which decays into a pair of b quarks at √s = 13 TeV”, JHEP06, 102 (2018). [16] The ATLAS Collaboration, ”Search for top quark decays t -> qH, with H -> gamma gamma √s = 13 TeV pp collisions using the ATLAS detector”, JHEP10, 129 (2017). | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/73547 | - |
dc.description.abstract | 本研究旨在尋找頂夸克透過味改變中性流衰變的過程。分析資料為由大強子對撞機緊湊緲子線圈偵測器所搜集之質子質子對撞質心能量13 兆電子伏特且積分光度為35.9逆飛靶恩之所有事件。本研究會著重於分析頂夸克成對生成事件,且其中一頂夸克衰變成底夸克與W玻色子,而另一頂夸克衰變成上夸克(或魅夸克)以及希格斯粒子; 此希格斯粒子最後會衰變成兩個光子。於先前在直心質量8 兆電⼦伏特同一分析之結果顯示,比較觀察與預測的雙光子最終態事件數,前者並無顯著過剩。本研究使用與分析8兆電子伏特資料同一研究流程與方法。 | zh_TW |
dc.description.abstract | The purpose of this study is searching for the top quark decay via flavor changing neutral current. The analyzed data is collected by CMS detector at LHC with 35.9 fb-1 integrated luminosity in pp collisions at √s = 13 TeV.
This study will be focused on Top quark-antiquark events, in which one of the top quarks decays to a bottom quark and a W boson, and the other decays to a charm(or up) quark and a Higgs boson, where Higgs decays to two photons. The previous √s = 8 TeV result shows no significant excess in data by comparing the observed and expected diphoton events of t -> qH process. The same strategy will be adopted in this study. | en |
dc.description.provenance | Made available in DSpace on 2021-06-17T07:41:17Z (GMT). No. of bitstreams: 1 ntu-108-R03222086-1.pdf: 4263903 bytes, checksum: 1c2feb85d624d1a0644865807beaf872 (MD5) Previous issue date: 2019 | en |
dc.description.tableofcontents | Contents
1 Introduction 1 2 Experimental Apparatus 3 2.1 Large Hadron Collider . . . . . . . . . . . . . . . . . . . . . . . . . 3 2.2 Compact Muon Solinoid . . . . . . . . . . . . . . . . . . . . . . . . 3 2.3 Tracking System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.4 Calorimeters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.5 Muon Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3 Data, Triggers and Simulation Samples 7 3.1 Dataset and trigger . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.2 Simulation Samples . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.3 Pile-up Reweighting Procedure . . . . . . . . . . . . . . . . . . . . 9 4 Objects Reconstruction and Identification 11 4.1 Photon Reconstruction and Identification . . . . . . . . . . . . . . 11 4.2 Lepton Identification . . . . . . . . . . . . . . . . . . . . . . . . . . 11 4.3 Jet Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.4 B-tagging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.5 Missing Transverse Energy . . . . . . . . . . . . . . . . . . . . . . . 14 5 Event Selection 15 5.1 Leptonic Channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 5.2 Hadronic Channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 5.3 Optimization of Selections . . . . . . . . . . . . . . . . . . . . . . . 20 6 Selection Results 23 6.1 Expected Yeilds and Selection Efficiency . . . . . . . . . . . . . . 23 6.2 Various Kinematic Distributions of Signal Samples . . . . . . . . 26 6.3 Various Kinematic Distributions of Data and Background Samples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 7 Signal and Background Estimation 39 7.1 Signal Modeling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 7.2 Background Modeling . . . . . . . . . . . . . . . . . . . . . . . . . 43 8 Systematic Uncertainties 46 9 Rusults 49 9.1 Upper Limmits Settings . . . . . . . . . . . . . . . . . . . . . . . . . 49 9.2 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 references 52 | |
dc.language.iso | en | |
dc.title | 於緊湊緲子線圈質心能量十三兆電子伏特中尋找頂夸克對之味改變中性流希格斯衰變成雙光子最終態 | zh_TW |
dc.title | Search for FCNH Top Quark Decay t -> qH with H -> gamma gamma in pp Collisions at at √s = 13 TeV in CMS | en |
dc.type | Thesis | |
dc.date.schoolyear | 107-1 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 呂榮祥(Rong-Shyang Lu),余欣珊(Shin-Shan Yu) | |
dc.subject.keyword | 味改變中性流,頂夸克,希格斯粒子,雙光子,13 兆電子伏特, | zh_TW |
dc.subject.keyword | FCNC,top quark,Higgs,diphoton,13 TeV, | en |
dc.relation.page | 53 | |
dc.identifier.doi | 10.6342/NTU201900591 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2019-02-14 | |
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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