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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 王名儒 | |
| dc.contributor.author | You-Hao Chang | en |
| dc.contributor.author | 張祐豪 | zh_TW |
| dc.date.accessioned | 2021-06-15T02:23:57Z | - |
| dc.date.available | 2012-08-20 | |
| dc.date.copyright | 2009-08-20 | |
| dc.date.issued | 2009 | |
| dc.date.submitted | 2009-08-18 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/43589 | - |
| dc.description.abstract | 藉由CDF實驗的數據,使得我們可以在LHC真正運作之前,來以蒙地卡羅法研析模擬的數據,由此來用現行的各種理論模型推測LHC開始運作後,其數據所可能有的各種行為分佈等等.
由此我們特別研析LHC中的MBUE事例,來了解低能量的資料數據分佈,藉此來推測當對撞能量提升到LHC實驗所擁有的14TeV數據行為,並依此來調整在模擬時所使用的各種理論模型還有模擬數據的產生器. | zh_TW |
| dc.description.abstract | The Tevatron experiments provide us very good information for the QCD modelings of event generators. However, in the LHC era, the collisions is in di fferent region of phase-space from that of Tevatron. A Naive rescaling of cross-sections will not work. The current modeling of non-trivial interplay of perturbative (multiple parton interactions) and non-perturbative (beam remnants, ISR, FSR) aspects based on Tevatron data have large di fferences when extrapolated to the LHC energy.
The charged particle and transverse momentum densities relative to the leading jet in di erent regions are examined. The simulation is done with the CMS detector under the start-up LHC conditions where the pile-up e ect can be neglected. This study is devoted to discriminating among di erent models and to help us to understand the QCD Monte Carlo models. Information obtained from this study will be useful to improve/tune Monte Carlo models which were only validated with the low energy Tevatron data. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-15T02:23:57Z (GMT). No. of bitstreams: 1 ntu-98-R96222043-1.pdf: 8374458 bytes, checksum: 436bf346a561c2ef16f9d35bb563163e (MD5) Previous issue date: 2009 | en |
| dc.description.tableofcontents | Contents
1 Introduction 1 1.1 Hard Interactions of Quarks and Gluons . . . . . . . . . . . . 1 1.2 Parton showers . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.3 The Underlying Event in Proton-Proton Interactions . . . . . 3 1.4 Multiple Parton Interaction in Proton-Proton Collisons . . . . 5 1.5 Observables to Study the Underlying Event . . . . . . . . . . 5 1.5.1 Charged-Jet Topologies and the Underlying Event . . . 6 1.5.2 Multiple Interaction and the Transverse Region . . . . 7 2 The Compact Muon Solenoid Experiment at LHC 11 2.1 The Large Hadron Collider (LHC) at CERN . . . . . . . . . . 11 2.2 Compact Muon Solenoid (CMS) . . . . . . . . . . . . . . . . . 13 2.2.1 Superconducting Magnet . . . . . . . . . . . . . . . . . 15 2.2.2 Inner Tracking System . . . . . . . . . . . . . . . . . . 16 2.2.3 Track Reconstruction with the CMS Tracker . . . . . . 20 2.2.4 Alignment Strategy for the CMS Tracker . . . . . . . . 23 2.2.5 Electromagnetic Calorimeter . . . . . . . . . . . . . . . 25 2.2.6 Hadron Calorimeter . . . . . . . . . . . . . . . . . . . . 25 2.2.7 Jet Reconstruction at CMS . . . . . . . . . . . . . . . 27 2.2.8 Plans for Jet Energy Corrections at CMS . . . . . . . . 28 2.2.9 Forward Detectors . . . . . . . . . . . . . . . . . . . . 28 2.2.10 Muon System . . . . . . . . . . . . . . . . . . . . . . . 29 2.2.11 Trigger . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 2.2.12 Data Acquisition . . . . . . . . . . . . . . . . . . . . . 33 2.2.13 Computing . . . . . . . . . . . . . . . . . . . . . . . . 34 3 Simulated Samples and Triggers 39 3.1 CSA07 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 3.2 SUMMER08 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 4 Studying the Underlying Event 43 4.1 Physics Object Reconstruction Studies . . . . . . . . . . . . . 44 4.1.1 Track Reconstruction Studies . . . . . . . . . . . . . . 44 4.1.2 Charged-Jet Studies . . . . . . . . . . . . . . . . . . . 45 4.2 Event Selection and Physics Object Selection . . . . . . . . . . 45 4.3 CSA07 Monte Carlo Data Validation . . . . . . . . . . . . . . 47 4.3.1 CSA07: Multiplicity and momentum densities in different region . . . . . . . . . . . . . . . . . . . . . 47 4.3.2 CSA07: Distribution of the distance R . . . . . . . . 49 4.3.3 CSA07: The energy ratio of charged and calorimetric jets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 4.3.4 CSA07: Density measurements v.s. event hard scale . . 51 4.4 SUMMER08 Monte Carlo Data Validation . . . . . . . . . . . 56 4.4.1 SUMMER08: Multiplicity and momentum densities in dierent region . . . . . . . . . . . . . . . . . . . . 56 4.4.2 SUMMER08: Density measurements v.s. event hard scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 5 Summary and Conclusions 67 | |
| dc.language.iso | en | |
| dc.title | 以蒙地卡羅法研析大強子對撞機的MBUE事例 | zh_TW |
| dc.title | Monte-Carlo Data Validation of the Minimum Bias and Underlying Events at LHC | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 97-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 熊怡,張寶棣,侯維恕,張敏娟 | |
| dc.subject.keyword | 高能物理,大強子對撞機,MBUE,CMS, | zh_TW |
| dc.subject.keyword | high energy physics,LHC,MBUE,CMS, | en |
| dc.relation.page | 72 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2009-08-18 | |
| 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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