博碩士論文 972402006 詳細資訊




以作者查詢圖書館館藏 以作者查詢臺灣博碩士 以作者查詢全國書目 勘誤回報 、線上人數:10 、訪客IP:54.161.118.57
姓名 陳冠昕(Kuan-Hsin Chen)  查詢紙本館藏   畢業系所 物理學系
論文名稱
(Measurement of Zγ production in 5 fb-1 of pp collisions at √s = 7 TeV with the CMS detector)
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摘要(中) 本篇論文呈現了使用質子-質子對撞、中心能量在7 TeV的 Zγ 生產截面積的量測。其使用的數據為由LHC產生,由CMS偵測器所蒐集得到,其累積光度為5.0 fb-1。此產生截面積量測是針對光子橫向能量大於15 GeV、光子與電子空間分離ΔR(e,γ)大於0.7且電子對的恆定質量大於50 GeV。量測的碰撞產生截面為5.20 ± 0.32(系統誤差) ± 0.32(系統誤差) ± 0.11(光度誤差) pb。結果與標準模型的預測相吻合。
摘要(英) Measurements of Zγ production cross section in proton-proton collisions at √s =7 TeV are presented. The results are based on data recorded by the CMS detector
at the LHC that correspond to an integrated luminosity of 5.0 fb−1. The cross sections are measured for photon transverse energy > 15 GeV, and for separations
between photons and final-state electrons in the pseudorapidity-azimuthal plane of ΔR(e, γ) > 0.7 in eeγ final state. A dielectron invariant mass requirement of di-electron pair > 50 GeV is imposed. The σ(pp → Zγ) × B(Z → e+ e−) is measured to be 5.20 ± 0.13(stat) ± 0.32(syst) ± 0.11(lum) pb. The results are consistent with predictions from the standard model.
關鍵字(中) ★ 光子
★ Z玻色子
★ 標準模型
★ 高能物理
關鍵字(英) ★ CMS
★ LHC
★ Standard Model
★ Zγ
論文目次 1 Introduction 1
2 The Experimental Setup 3
2.1 The Large Hadron Collider . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1.1 The Luminosity of LHC . . . . . . . . . . . . . . . . . . . . . 5
2.2 CMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2.1 The coordinate of CMS detector . . . . . . . . . . . . . . . . . 6
2.2.2 Magnet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2.3 Tracker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2.4 Electromagnetic Calorimeter . . . . . . . . . . . . . . . . . . . 10
2.2.5 Hardronic Calorimeter . . . . . . . . . . . . . . . . . . . . . . 15
2.2.6 Muon Detectors . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3 Overview of Zγ Production 18
3.1 Standard Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.2 Electroweak Theory . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.3 Zγ production and anomalous triple gauge coupling . . . . . . . . . . 22
3.3.1 Standard Model Zγ production . . . . . . . . . . . . . . . . . 22
3.3.2 Anomalous triple gauge coupling . . . . . . . . . . . . . . . . 23
4 Analysis Method 25
4.1 Data and Monte Carlo samples . . . . . . . . . . . . . . . . . . . . . 25
4.1.1 Data samples . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.1.2 Monte Carlo samples . . . . . . . . . . . . . . . . . . . . . . . 25
4.2 Object selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.2.1 Triggers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.2.2 Electron selection . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.2.3 Tag and Probe Method . . . . . . . . . . . . . . . . . . . . . . 32
4.2.4 Photon selection . . . . . . . . . . . . . . . . . . . . . . . . . 44
4.3 Data-Driven Background Methods . . . . . . . . . . . . . . . . . . . . 50
4.3.1 The template method . . . . . . . . . . . . . . . . . . . . . . . 50
4.3.2 The ratio method . . . . . . . . . . . . . . . . . . . . . . . . . 57
5 Measurement of Zγ Production Cross-Section 60
5.1 Event selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
5.2 Determination of backgrounds . . . . . . . . . . . . . . . . . . . . . . 70
5.3 Systematic uncertainties . . . . . . . . . . . . . . . . . . . . . . . . . 76
5.3.1 Systematic uncertainty on N sig . . . . . . . . . . . . . . . . . 76
5.3.2 Systematic uncertainty on F = A s ·  MC . . . . . . . . . . . . 76
5.3.3 Systematic uncertainty ρ eff . . . . . . . . . . . . . . . . . . . 77
5.3.4 Systematic uncertainty on the background estimation . . . . . 78
5.3.5 Systematic uncertainty on lluminosity . . . . . . . . . . . . . . 79
5.3.6 Summary of systematic uncertainties . . . . . . . . . . . . . . 79
5.4 Measurement of the Zγ cross section . . . . . . . . . . . . . . . . . . 82
5.4.1 Production cross section . . . . . . . . . . . . . . . . . . . . . 82
5.4.2 Results of Zγ cross section . . . . . . . . . . . . . . . . . . . . 83
6 Conclustion 86
A Anomalous triple gauge couplings in Zγ production 88
B Cut based photon identification for 2012 dataset 90
B.1 Event selection criteria . . . . . . . . . . . . . . . . . . . . . . . . . . 90
B.2 Tag and probe method . . . . . . . . . . . . . . . . . . . . . . . . . . 91
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指導教授 郭家銘(Chia-Ming Kuo) 審核日期 2014-10-9
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