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請用此 Handle URI 來引用此文件: http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/51624
完整後設資料紀錄
DC 欄位值語言
dc.contributor.advisor王名儒(Min-Zu Wang)
dc.contributor.authorYou-Hao Changen
dc.contributor.author張祐豪zh_TW
dc.date.accessioned2021-06-15T13:41:42Z-
dc.date.available2016-02-15
dc.date.copyright2016-02-15
dc.date.issued2016
dc.date.submitted2016-01-06
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dc.identifier.urihttp://tdr.lib.ntu.edu.tw/jspui/handle/123456789/51624-
dc.description.abstract在大強子對撞機實驗中,同時間在同一粒子對撞中產生多組反應的機率是不可忽略的。這些額外的反應隨著對撞時的質心能量的增加,其發生的機率也隨之增 加,並且變得能夠辨識,甚至於影響分析那些來自主要對撞反應的物理現象。我們探討質心能量為七兆電子伏特的質子質子對撞實驗中單光子加上三個噴流事例的雙部分子散射現象。其中實驗數據是在二零一零年由大強子對撞機實驗的緊湊 渺子線圈偵測器所收集而來,數據的總有效照度約為三十六 皮靶負一次方。藉由分析緊湊秒子線圈偵測器所得數據,並加以重組數據資訊及篩選事例, 我們測量出質子質子對撞後末狀態為一個光子加上三個噴流的事例截面可能性為一百二十四點九 皮靶,統計誤差約為八點九 皮靶,系統誤差約為二十二點六 皮靶。同時 我們也探討了事例中, 光子和三個噴流的空間分布以及橫向動量平衡等有利於觀察雙部分子散射現像的物理量,而藉由蒙地卡羅法來模擬預測且和實際數據作比 對, 使我們了解各種物理模型正確性並對其加以修正。zh_TW
dc.description.abstractThe probability of having more than one interaction per collision is non-negligible at the LHC. These additional interactions might reach a hard scale comparable to the primary scattering and become experimentally distinguishable at high energies. Distributions sensitive to double parton scattering are investigated in the photon + 3 jets final state in proton-proton collisions at a center-of-mass energy of 7 TeV. The data were collected by the CMS experiment at the LHC with an integrated luminosity of 36 pb−1 in 2010. The cross section σ for a final state with a photon and a jet of transverse momentum pT > 75 GeV together with 2 jets of pT > 20 GeV, where the photon and jets are within the fiducial volume of the CMS detector, is measured to be 124.9 ± 8.9 (stat.) ± 22.6 (syst.) pb. The differential cross sections are measured as a function of the difference in azimuthal angles and the transverse momentum balance between the photon-jet pair and the di-jet pair. Further it is investigated whether additional contributions from double par- ton scattering can improve the agreement between the measured data and the Monte Carlo predictions.en
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dc.description.tableofcontents口試委員會審定書 i
Acknowledgment iii
中文摘要 v
Abstract vii
Table of Contents ix
Chapter I Introduction 1
Chapter II Experimental Apparatus 7
II.1 Overview of the LHC....................... 7
II.2 The CMS Detector ........................ 10
II.2.1 Magnet........................... 12
II.2.2 TrackingDetectors..................... 12
II.2.3 Electromagnetic Calorimeter (ECAL) . . . . . . . . . . . 14
II.2.4 Hadronic Calorimeter(HCAL) .............. 17
II.2.5 Jet Reconstruction as CMS ................ 19
II.2.6 MuonSystem ....................... 20
II.2.7 GlobalEventReconstruction ............... 22
II.3 Trigger System .......................... 23
II.3.1 Level-1Trigger(L1).................... 23
II.3.2 High Level Trigger(HLT)................. 24
II.4 Computing ............................ 24
Chapter III Data and Monte Carlo Simulation 29
Chapter IV Event Selection 35
IV.1 Trigger Requirement ....................... 36
IV.2 Pileup Reweighting ........................ 37
IV.3 Photon identification ....................... 40
IV.4 Jetidentification.......................... 42
Chapter V Discriminating observables 49
Chapter VI Photon + 3 jets events at detector level 55
VI.1 DPS performance at detector level ................ 55
VI.2 Purity of isolated prompt photons................. 58
Chapter VII Correction and unfolding 65
VII.1 Acceptance, background, purity and stability . . . . . . . . . . . 66
VII.2 Unfolding with RooUnfold .................... 69
Chapter VIII Systematic Uncertainties 73
VIII.1 Photon energy scale uncertainty ................. 74
VIII.2 Photon energy resolution uncertainty . . . . . . . . . . . . . . . 74
VIII.3 Jet energy scale uncertainty.................... 75
VIII.4 Jet energy resolution uncertainty ................. 76
VIII.5 Model dependence uncertainty .................. 77
VIII.6 Photon identification efficiency uncertainty . . . . . . . . . . . . 77
VIII.7 Pilepup reweighting uncertainty ................. 78
VIII.8 Second Primary Vertex selection Uncertainty . . . . . . . . . . 79
VIII.9 Jet-vertex association Uncertainty . . . . . . . . . . . . . . . . 80
VIII.10 The sample size of Monte Carlo simulation . . . . . . . . . . . 80
VIII.11 HLT efficiency correction uncertainty . . . . . . . . . . . . . . 81
VIII.12 Total systematic uncertainty ................... 81
Chapter IX Results 85
Chapter X Bibliography 91
Bibliography 93
dc.language.isoen
dc.subject基底事件zh_TW
dc.subject量子色動力學zh_TW
dc.subject雙部分子散射現象zh_TW
dc.subject多部分子反應zh_TW
dc.subjectMultiple parton interactionen
dc.subjectDouble parton scatteringen
dc.subjectUnderlying eventen
dc.subjectQCDen
dc.title利用緊湊渺子線圈探討質子質子對撞實驗中單光子加上三個噴流事例的雙部分子散射現象zh_TW
dc.titleStudy of Double Parton Scattering in Photon + 3 Jets Final State in Proton-Proton Collisions at √s = 7TeV in CMSen
dc.typeThesis
dc.date.schoolyear104-1
dc.description.degree博士
dc.contributor.coadvisor巴保祿(Paolo Bartalini),余欣珊(Shin-Shan Yu)
dc.contributor.oralexamcommittee張寶棣(Pao-Ti Chang),陳凱風(Kai-Feng Chen),裴思達(Stathes Paganis)
dc.subject.keyword量子色動力學,基底事件,多部分子反應,雙部分子散射現象,zh_TW
dc.subject.keywordQCD,Underlying event,Multiple parton interaction,Double parton scattering,en
dc.relation.page100
dc.rights.note有償授權
dc.date.accepted2016-01-06
dc.contributor.author-college理學院zh_TW
dc.contributor.author-dept物理研究所zh_TW
顯示於系所單位:物理學系

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