在緊湊渺子線的質心對撞能量為 13 兆電子伏特的數據裡, 用字母法輔以突起搜尋之方法來尋找類 Z 玻色子衰變為 Z 玻色子及希格斯粒子在衰變為輕子與底垮克

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張祐祥(Yu-Hsiang Chang) 查詢紙本館藏

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論文名稱

在緊湊渺子線的質心對撞能量為 13 兆電子伏特的數據裡, 用字母法輔以突起搜尋之方法來尋找類 Z 玻色子衰變為 Z 玻色子及希格斯粒子在衰變為輕子與底垮克
(Using Alphabet Assisted Bump Hunt to Search for Z′ to Zh to ll bb at sqrt(s)=13 TeV with the CMS Detector)

相關論文

★ 7 TeV 和2.76 TeV 質子對撞下，光子散射截面積的測量	★ Search for Pair Production of t*-> t + photon : Estimation of Photon Purity and Study of the Top and W Mass Resolution
★ 以大型強子對撞機裡的緊湊渺子線圈偵測器尋找重夸克在半輕子頻道衰變成頂夸克和光子	★ Search for Z′→Zh→llbb in pp Collisions at √s =8 TeV Using the CMS Detector at the LHC
★ Search for heavy resonances decaying into a Z boson and a Higgs boson in the 2l2b final state in pp collisions at √s = 13 TeV	★ 從質子質子對撞在質量中心能量 13 兆電子伏特利用緊湊渺子偵測器尋找重粒子衰變到一對希格斯粒子於四個底夸克最終態
★ Study of the b-tagging Scale Factor using the tt ̅ Events from pp collisions at √s =13 TeV with the CMS Detector	★ 在大型強子對撞機的緊湊渺子線圈偵測器，使用13兆電子伏特的質子-質子對撞尋找會衰變到一對希格斯玻色子且最終狀態為四個底夸克的重共振態
★ 在與希格斯玻色子有關聯的暗物質搜索中去測量深度雙底夸克標記校正因子的誤判率	★ The Study of the Di-Higgs Production via Vector Boson Fusion Channel for the Phase II CMS at √? =14 TeV
★ 於尋找單希格斯粒子中研究噴流子結構可觀測量	★ The analysis of the TASEH CD102 data
★ 找尋具有長生命週期新粒子的物理模型所預測的暗物質	★ Toward discovering the low-mass dark matter: Constraints on Searches of Low-mass Weakly Interacting Massive Particle (WIMP) with Earth Attenuation Effect incorporated && Exploring the physics of germanium internal amplification for low-energy detection

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摘要(中)

用 2016 年在緊湊秒子線圈從質心對撞能量為 13 兆電子伏特的大型強子對撞機的數據來進行一個對類 Z 新粒子的搜尋, 這個數據對應到的積分亮度為 35.8 fb^{-1}。在這個分析中,類 Z 新粒子的衰變頻道是只針對類 Z 新粒子衰變到 Z 玻色子和希格斯粒子來討論,其中希格斯粒子會再衰變為正反底垮克對,而 Z 玻色子則是以輕子頻道來衰變。因為希格斯粒子是被高度地推進,所以兩個底垮克的方向相當平行且被重建在一個半徑為 0.8 的胖噴流裡。雙底垮克標記演算法和希格斯粒子質量區間的要求是被施加來減少背景事件。剩下的背景事件是由字母法輔以突起搜尋之方法來估計。字母法是用來估計在信號區域的事件數,而信號區域和控制區域的同步擬合用來決定形狀。

摘要(英)

A search for a new particle Z’ is performed in the data collected by the CMS detector in 2016 at the LHC center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.8 fb^{-1}. The decay channel of Z’ is focused on Z’ to Z H, and the Higgs boson decays to b bar while the Z boson decays leptonically. Since the Higgs boson is highly boosted, the two b-quarks are collimated and thus reconstructed in a fat jet with a radius of 0.8. The double-b tagger algorithm and the Higgs mass window cut are applied to reduce the background events. The remaining background events are estimated by the ALPHABET assisted Bump Hunt method, where the ALPHABET method constraints the event yields in the signal region, and the simultaneous fit in both the signal region and the control region determines the shape.

關鍵字(中)

★ 底垮克
★ 緊湊秒子線圈
★ 大型強子對撞機

關鍵字(英)

★ CMS
★ LHC
★ b-tagging
★ Higgs boson

論文目次

1 Introduction 1

1.1 TheoryMotivation ........................... 1

1.2 AnalysisStrategy ............................ 4

2 The Experimental Setup 5

2.1 LargeHadronCollider ......................... 5

2.2 CompactMuonSolenoid........................ 5

2.2.1 Tracker.............................. 7

2.2.2 ElectromagneticCalorimeter ................. 7

2.2.3 HadronicCalorimeter ..................... 8

2.2.4 Magnet.............................. 9

2.2.5 MuonSystem .......................... 10

3 Datasets and Simulation Samples 11

3.1 Data.................................... 11

3.2 Trigger .................................. 12

3.3 MonteCarlosample .......................... 15

3.3.1 Signal............................... 15

3.3.2 Background ........................... 16

4 Event Selection 19

4.1 VertexandPileUp............................ 19

4.2 Electrons................................. 19

4.3 Muons .................................. 21

4.4 Jets .................................... 22

4.5 JetMass.................................. 23

4.6 b-Tagging................................. 24

4.7 FinalSelection.............................. 25

5 Data MC comparison 29

6 Background Estimation 37

6.1 Alphabet................................. 37

6.2 AlphabetAssistedBumpHunt(AABH) ............... 45

6.2.1 Alphabet............................. 45

6.2.2 Methodvalidation ....................... 47

6.2.3 BumpHunt ........................... 49

6.2.4 Signalmodeling......................... 50

6.2.5 ZHmodeling .......................... 53

6.2.6 simultaneousfit......................... 54

7 Systematic Uncertainties 57

7.1 Pile-up .................................. 58

7.2 Double-btagger............................. 58

7.3 HiggsMassTagging .......................... 58

7.4 JetEnergyScaleandResolution.................... 59

7.5 JetmassScaleandResolution ..................... 59

7.6 Trigger .................................. 60

7.7 LeptonIDandScale........................... 60

7.8 QCDscaleandPDF........................... 64

7.9 Luminosity................................ 64

7.10Pass-FailRatioFit............................ 64

7.11SizeoftheControlRegion....................... 65

7.12Sizeofthesimulatedsignalsample.................. 66

7.13 SummaryoftheSystematicUncertainties . . . . . . . . . . . . . . 66

8 Result. . . . . . . . . . . . . . 69

9 Summary. . . . . . . . . . . . . . 73

Bibliography. . . . . . . . . . . . . . 75

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指導教授

余欣珊(Shin-Shan Yu)

審核日期

2019-8-20

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