Search for Exotic Decay of A Higgs Boson into A Dark Photon and a Standard Model Photon in pp Collisions at √s = 13 TeV

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汪本璿(Pen-Hsuan Wang) 查詢紙本館藏

畢業系所

物理學系

論文名稱

(Search for Exotic Decay of A Higgs Boson into A Dark Photon and a Standard Model Photon in pp Collisions at √s = 13 TeV)

相關論文

★ 利用CMS探測器量測7TeV下的Zγ產生截面	★ 以CMS 偵測器在質心質量為8TeV使用雙渺子和三秒子頻道尋找雙電荷希格斯玻色子
★ 在質子對撞能量8TeV下尋找具有雙電子雙渺子末態的激發態輕子	★ Measurement of Zγ production in 5 fb-1 of pp collisions at √s = 7 TeV with the CMS detector
★ Search for a Higgs boson decaying into γ∗γ → eeγ in pp collisions at √s = 8 TeV with the CMS detector	★ Measurement of Z boson production in the electron decay channel in p+Pb collisions at √sNN = 5.02 TeV with the CMS detector
★ 火花偵測器的製成	★ Search for the production of two Higgs bosons in the final state with two photons and two b quarks in proton-proton collision at √s = 13 TeV
★ Search for a Higgs boson decay into γ*γ→μμγ in pp collisions at √s = 13 TeV	★ Search for the rare decays of Z and Higgs bosons to J/ψ plus photon at √s = 13 TeV
★ Measurement of Zγ production cross section in pp collisions at sqrt(s) = 13 TeV with the CMS detector	★ Search for H→Zγ→bbγ produced in association with a Z boson in proton-proton collisions at √s = 13 TeV with the CMS detector at the LHC
★ nono	★ TCAD simulation of silicon detector
★ Assembly and Beam Test Analysis of sPHENIX INTT Detector	★ 研究 Dalitz Higgs 的 Muon 效率用於 Run II 和多變量電子用於 CMS 的 Run III

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摘要(中)

有關暗光子的理論主要是出自於早期天文物理觀測的結果與現有理論不符合，這些觀測結果指出新物理的存在。為了解釋觀測結果，理論學家延伸自標準模型 U(1)群，在 Hidden Sector 中建立了一個新的假設性的 U(1)群。暗光子為此假設性的 U(1)群的介子。歐洲核子物理研究所的大強子對撞機為目前世界上對撞能量最高且高亮度的質子質子對撞機，因此擁有龐大的潛能來尋找 GeV 質量尺度的暗光子。本篇論文利用質子-質子質心能量√s = 13 TeV 的對撞產生希格斯粒子，暗光子則藉由希格斯粒子的稀有衰變來產生，並且通過暗光子的渺子衰變頻道來尋找新的渺子-渺子對不變質量共振來尋找暗光子，此研究使用 2016 年全年度 CMS 所蒐集的資料進
行分析，總亮度為35.9fb-1。

摘要(英)

The hypothesis of Dark Photon(ZD) is motivated by a number of astrophysi- cal observational anomalies which indicate the new physics beyond Standard Model(SM) is existing in our world. The Hidden Sector contains a hypothetical U (1)D gauge group is introduced by extension of the SM. The ZD is a theoretical particle which does not play a role as Dark Matter(DM) itself but play a role as gauge mediator of hypothetical hidden U(1)D gauge group. With the advent of the Large Hadron Collider(LHC), a powerful machine with unprecedented high central-of-mass energies and high luminosities gives the potential to probe the GeV scale ZD. The searches of ZD from exotic Higgs decays and decaying into a muon pair in pp collision with √s = 13 TeV is ongoing by looking for new dilepton invariant mass in sub-GeV scale. This analysis using full 2016 data recorded by CMS detector in integrated luminosity 35.9 fb?1.

關鍵字(中)

★ 稀有希格斯衰變
★ 緊湊渺子線圈
★ 大強子對撞機緊湊渺子線圈

關鍵字(英)

★ Dark photon
★ Exotic Higgs decay
★ Large Hadron Collider
★ Compact Moun Solenoid
★ Hidden sector

論文目次

1 Introduction and Theory Overview 1
1.1 Motivation................................ 1
1.2 The Dark Photon ............................ 2
1.2.1 The Kinematic Mixing ..................... 3
1.2.2 The Production of ZD Via a New Vector-like Fermion Loop 4
1.2.3 The Production of ZD Via Kinematic Mixing in The SM H→ZγProcess ........................ 6
1.3 SignalSearchingandKinematic.................... 8
1.4 ReviewofZDSearches ......................... 10
2 The LHC and CMS detector 13
2.1 Large Hadron Collider ......................... 13
2.2 CMS Detector ............................... 14
2.2.1 Coordinate in CMS....................... 16
2.2.2 Superconducting Magnet ................... 16
2.2.3 Tracking System ........................ 16
2.2.4 Electromagnetic Calorimeter ................. 18
2.2.5 Hadron Calorimeter ...................... 20
2.2.6 Muon System .......................... 20
2.3 Trigger System.............................. 24
2.3.1 Level-1Trigger ......................... 24
2.3.2 High Level Trigger ....................... 24
3 Analysis Strategy 27
3.1 Datasets and Monte Carlo samples.................. 28
3.1.1 Datasets ............................. 28
3.1.2 Monte Carlo Samples ..................... 28
Signal samples ......................... 28
Background Samples...................... 33
3.2 Trigger .................................. 34
3.3 Objects Reconstruction and Identification . . . . . . . . . . . . . . 35
3.3.1 Vertex Reconstruction and Pile-up . . . . . . . . . . . . . . 35
3.3.2 MuonReconstruction ..................... 36
Local Reconstruction...................... 36
Global Reconstruction ..................... 37
Particle Flow Muons...................... 38
Muon Momentum Correction................. 38
3.3.3 Electron and Photon Reconstruction . . . . . . . . . . . . . 39 Clustering............................ 39
Supercluster Energy Correction................ 40
Fine Tuning of Photon Energy Scale and Smearing . . . . . 41
3.4 Objects Selection ............................ 42
3.4.1 Muon Selections ........................ 43
3.4.2 PhotonSelections........................ 44
3.5 Events Selection............................. 45
3.5.1 Higgs Mass Window Cut ................... 45
3.5.2 ?R(μ,μ)Cut .......................... 48
3.5.3 Boosted Kinematic Cut..................... 50
3.6 Corrections on Monte Carlo Sample ................. 51
3.6.1 Pileup Reweighting ...................... 51
3.6.2 ID Scaling Factors........................ 52
Photon SFs............................ 53
Double Muon Trigger SFs ................... 56
Muon SFs ............................ 58
3.7 Selected Events from Data and Acceptance×Efficiency of MC Signal 60
4 Background and Signal Estimation 63
4.1 Background ............................... 63
4.1.1 Sideband Control Region ................... 63
4.1.2 Background Fitting....................... 65
4.2 Signal................................... 67
4.2.1 FSR Recovery .......................... 68
4.2.2 Signal Fitting .......................... 69
5 Systematic Uncertainties 71
5.1 Pileup Reweighting Uncertainty ................... 71
5.2 DoubleMuon Trigger Efficiency Uncertainty . . . . . . . . . . . . 72
5.3 Photon MVA ID Efficiency Uncertainty ............... 72
5.4 Muon ID Efficiency uncertainty.................... 76
5.5 Photon Energy Scale and Smear Uncertainties . . . . . . . . . . . 77
5.6 Muon Momentum Scale and Smear Uncertainties . . . . . . . . . 78
5.7 Background Shape Uncertainties ................... 81
5.8 Total systematic uncertainty...................... 83
6 Result 85
6.1 Cross Section×Branching Ratio Limit ................ 85
6.2 Conclusion................................ 88
Bibliography 91

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指導教授

郭家銘(Chia-Ming Kuo)

審核日期

2018-7-19

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