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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 | Jui-Fa Tsai | en |
dc.contributor.author | 蔡瑞發 | zh_TW |
dc.date.accessioned | 2021-06-16T09:45:35Z | - |
dc.date.available | 2017-02-16 | |
dc.date.copyright | 2017-02-16 | |
dc.date.issued | 2017 | |
dc.date.submitted | 2017-01-24 | |
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/59928 | - |
dc.description.abstract | 此論文發表第一個尋找頂夸克對的電荷宇稱(CP)破壞現象。此研究利用 T-odd 三重乘積組合之可觀測量來做非對稱量測,其T為時間反轉運算子。此實驗是基於 8 TeV中心質量的質子對撞資料數據而進行分析,而數據量為 19.7 fb-1 並由緊湊緲子線圈偵測器(CMS)所收集。此分析關注於對撞結果的事件含有至少四個噴流以及一個電子或渺子。其 T-odd 可觀測量均由頂夸克對衰變粒子的線性獨立四動量而組成。最後的非對稱量測結果顯示沒有CP 破壞效應的徵兆,並吻合標準模型的預測。 | zh_TW |
dc.description.abstract | We present the first search for CP violation in top quark-antiquark pair events. The search is based on asymmetries in T-odd triple product correlation observables, where T is the time reversal operator. The analysis is based on a sample of proton-proton collisions at sqrt(s)=8TeV collected by the CMS experiment, corresponding to an integrated luminosity of 19.7fb^-1. The analysis is performed with events having exactly one electron or muon and at least four jets. The T-odd observables are measured using the linearly independent four-momentum vectors associated with top quark production and decay. The measured asymmetries exhibit no evidence for CP-violating effects, in agreement with the standard model prediction. | en |
dc.description.provenance | Made available in DSpace on 2021-06-16T09:45:35Z (GMT). No. of bitstreams: 1 ntu-106-F00222072-1.pdf: 12108873 bytes, checksum: 4a33c8281547057ae6ada75fbfab513a (MD5) Previous issue date: 2017 | en |
dc.description.tableofcontents | 1 Introduction 1
1.1 T-oddtripleproductsformeasurementCPV . . . . . . . . . . . . . . 1 1.1.1 Example for constructing T-odd triple product . . . . . . . . . 2 1.1.2 GeneralcaseforT-oddtripleproduct . . . . . . . . . . . . . . 4 1.2 PossiblemodelstogenerateCPviolationintt. . . . . . . . . . . . . . 5 1.2.1 ObservablesusedinLHC ..................... 6 1.2.2 Theoreticalpredictionofasymmetries . . . . . . . . . . . . . . 11 1.3 Experimentalanddataanalysisstrategy................. 11 2 The CMS detector 13 2.1 Structureanddesign ............................ 15 2.2 Trackerdetector............................... 17 2.3 ECALdetector................................ 18 2.4 HCALdetector ............................... 19 2.5 Muonchamber ............................... 19 3 Data and simulated samples 21 3.1 Data...................................... 21 3.2 Simulatedsamples ............................. 23 4 Event selections and object selections 29 4.1 Objectselections............................... 30 4.1.1 Primaryvertex ........................... 31 4.1.2 Electron ............................... 33 4.1.3 Muon................................. 35 4.1.4 Jetandb-tag............................. 38 4.1.4.1 b-tagging algorithm and selections . . . . . . . . . . 42 4.1.5 bbjetsseparation.......................... 46 4.2 Eventselections ............................... 49 4.2.1 Signalregion ............................ 49 4.2.1.1 Performance of the bb separation with MC . . . . . . 50 4.2.1.2 Final event candidates and additional corrections . . 53 4.2.2 Controlregions ........................... 57 4.2.2.1 0b-jetcontrolsample .................. 58 4.2.2.2 2CSVLb-jetscontrolsample.............. 59 5 Asymmetric bias studies 63 5.1 A0CPinsimulatedsamples ......................... 64 5.2 Detectorandreconstruction ........................ 66 5.3 CSVb-taggingdiscriminator........................ 69 5.4 Differentresponsesofbandbjet ..................... 69 5.5 Leptonchargemisidentification...................... 71 6 Background estimation 75 6.1 Templatefit ................................. 76 6.1.1 Binnedtemplates.......................... 77 6.1.2 Event extraction with likelihood function . . . . . . . . . . . . 79 6.1.2.1 Likelihoodfunction ................... 79 6.1.2.2 Extendedlikelihoodfunction . . . . . . . . . . . . . 80 6.1.2.3 Application........................ 82 6.2 Fittedresults................................. 83 6.2.1 Uncertaintiesoffittedresults ................... 84 6.3 Backgroundestimation........................... 86 6.3.1 Optimisationcut .......................... 87 6.3.2 A0CPextraction............................ 89 6.4 Closuretests................................. 89 7 Systematic uncertainties 93 7.1 Simulationuncertainties .......................... 93 7.1.1 Correctionuncertainties...................... 94 7.1.1.1 Pileupmodeling..................... 94 7.1.1.2 LeptonIDandisolation................. 94 7.1.1.3 Jetenergycorrections .................. 95 7.1.1.4 btaggingscalefactors.................. 95 7.1.2 Theoreticaluncertainties...................... 96 7.1.2.1 Partondistributionfunction . . . . . . . . . . . . . . 96 7.1.2.2 ttmodeling........................ 96 7.1.2.3 Topquarkmass ..................... 97 7.1.2.4 ToppT ........................... 97 7.1.3 Summeryofsimulationuncertainties . . . . . . . . . . . . . . 98 7.2 Fituncertainties............................... 99 7.3 Asymmetryuncertainties .........................101 8 Results 105 8.1 Experimentalsensitivitystudy ......................105 8.1.1 Estimationofdilutionfactors...................106 8.1.2 Validationinsimulatedsamples .................107 8.1.3 Dilutionsourceestimation.....................108 8.2 Asymmetrymeasurements ........................112 8.2.1 Blindingtests ............................113 8.2.2 Unblindedmeasurements.....................114 9 Summary 119 Appendices 121 A Dilution correction factors 123 A.1 Case1-Misstaggingeffectonly .....................124 A.2 Case2-Misstaggingandinversebbtaggingeffect . . . . . . . . . . . 125 B Error propagation of AC P 129 C Phase 1 silicon pixel detector upgrade 131 C.1 Coldboxlaboratory.............................132 C.2 Qualificationtests..............................134 D Preshoweralignment 137 D.1 Selection ...................................139 D.2 Resultsandvalidation ...........................140 E b-tagging commissioning in tt 143 E.1 Dataandsimulatedsample ........................143 E.2 ttevents ...................................144 E.3 Interestingvariables ............................145 Referances 147 | |
dc.language.iso | en | |
dc.title | 尋找電荷宇稱破壞在質子對撞後頂夸克對的產生與衰變 | zh_TW |
dc.title | Search for CP violation in top quark-antiquark production and decay in proton-proton collisions | en |
dc.type | Thesis | |
dc.date.schoolyear | 105-1 | |
dc.description.degree | 博士 | |
dc.contributor.oralexamcommittee | 王嵩銘,張元翰,徐百嫺,熊怡,何小剛 | |
dc.subject.keyword | 高能物理,粒子物理,高能實驗,粒子加速器,頂夸克,電荷宇稱破壞, | zh_TW |
dc.subject.keyword | High energy physics,particle physics,top,quark,CPV,CP violation,CMS,CERN, | en |
dc.relation.page | 150 | |
dc.identifier.doi | 10.6342/NTU201700205 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2017-01-24 | |
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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