Search for Pair Production of   t*-> t + photon   : Estimation of Photon Purity and Study of the Top and W Mass Resolution

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姓名

蔡芳英(Fang-Ying Tsai) 查詢紙本館藏

畢業系所

物理學系

論文名稱

Search for Pair Production of t*-> t + photon : Estimation of Photon Purity and Study of the Top and W Mass Resolution
(Search for Pair Production of t*-> t + photon : Estimation of Photon Purity and Study of the Top and W Mass Resolution)

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摘要(中)

Randall-Sundrum模型提供一個合理的方式解釋新物理和Higgs Boson重量的超大修正，並且預測了一個最輕自旋數為3/2的Kaluza-Klein粒子。我們利用LHC的能量尺度找尋經由pair-production產生的帶有自旋3/2的右旋頂垮克。本篇論文在19.6 fb^(-1)的質子質子對撞數據且總碰撞能量為8 TeV下，利用χ^2 sorting的方法重建t* 粒子, 此方法包含了找mass resolution的值和neutrino在z方向動量正確率最高的解。我們可以利用 χ^2和 Likelihood fitter 去估計data裡那些從標準模型來的主要背景干擾數量。我們利用質心能量在7TeV且數量為2.4到35.9pb^(-1)的單光子數據，來測試這兩種估計方法的正確性。

摘要(英)

Randall-Sundrum model provides a reasonable way to explain the hierarchy problem and it predicts the lightest spin-3/2 Kaluza-Klein particle. We are searching for the singlet top of spin-3/2 through pair-production that may be produced at LHC energies. This thesis presents the χ^2 sorting method, which includes studies of mass resolution and the probability of getting correct solution of neutrino pz to reconstruct spin-3/2 particle at √s=8 TeV using 19.6 fb^(-1)of proton-proton collision data collected by CMS. In order to estimate dominated background in data, we also provide two methods, χ^2 fitter and Likelihood fitter. These methods use inclusive photon at √s=7 TeV and the data sample corresponds from 2.4 to 35.9 pb^(-1).

關鍵字(中)

★ 自旋3/2頂垮克

關鍵字(英)

★ pair production of t* to top+photon

論文目次

Content
摘要 I
Abstract II
誌謝 III
Chapter 1 Introduction 1
1.1 The Standard Model 1
1.2 Search of Heavy Quark t* 3
1.2.1 The Randall-Sundrum Model 3
1.2.2 Basics of Kaluza-Klein theory 5
1.2.3 Spin-3/2 excitations in the R-S Model 7
Chapter 2 CMS Detector in LHC 11
2.1 The Large Hadron Collider 11
2.2 The Compact Muon Solenoid Detector 12
2.2.1 Tracker 15
2.2.2 Electromagnetic Calorimeter 17
2.2.3 Hadronic Calorimeter 18
2.2.4 Muon Chamber 19
2.2.5 Magnet system 20
Chapter 3 Reconstruction of Physics Objects 21
3.1 Software Setup 21
3.1.1 Event Generator 21
3.1.2 Detector Simulation 22
3.1.3 Trigger Simulation 22
3.2 Final-State Objects Reconstruction 22
3.3 Photon Reconstruction 24
3.3.1 Photon Selection Variables 24
3.3.2 Track Finding for Conversion 26
3.4 Electron Reconstruction 27
3.4.1 Electron Selection Variables 28
3.4.2 Photon Conversion Rejection 29
3.5 Muon Reconstruction 30
3.6 Jet Reconstruction 30
Chapter 4 Analysis 32
4.1 Monte Carlo Simulation of Background 32
4.1.1 Estimation of Inclusive Photon 34
4.1.2 Photon Purity 39
4.2 Mass χ2 Sorting 43
4.2.1 Longitudinal Momentum of the Neutrino 43
4.2.2 Mass Resolution 45
Chapter 5 Conclusion 50
Appendix 51
Efficiency 51
Mass Resolution 52
Reference 57

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指導教授

余欣珊(Shin-Shan Yu)

審核日期

2013-7-22

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