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系統識別號 U0026-1308202017453800
論文名稱(中文) 用STAR探測器在√s =200GeV的金離子與金離子對撞實驗中利用雙渺子末態量測 Υ 粒子的生成抑制現象
論文名稱(英文) Measurements of the Υ suppression in Au-Au collisions at √s = 200 GeV via the dimuon decay channel at the STAR experiment
校院名稱 成功大學
系所名稱(中) 物理學系
系所名稱(英) Department of Physics
學年度 108
學期 2
出版年 109
研究生(中文) 張哲嘉
研究生(英文) Zhe-Jia Zhang
電子信箱 xdxxxx4713@gmail.com
學號 L26061155
學位類別 碩士
語文別 英文
論文頁數 65頁
口試委員 指導教授-楊毅
口試委員-章文箴
口試委員-陳炳志
中文關鍵字 STAR  MTD  quarkonium  Υ  RAA 
英文關鍵字 STAR  MTD  quarkonium  Υ  RAA 
學科別分類
中文摘要 位於美國布魯克海文國家實驗室 (Brookhaven National Laboratory) 的相對論性重離子對撞機 (Relativistic Heavy Ion Collider) 中的 STAR 實驗於 2014 年完成了渺子探測器 (Muon Telescope Detector) 的安裝,使我們能夠藉由雙渺子衰變來研究夸克偶對 (quarkonium) 相關的物理。
在這篇論文中,我們結合了於 2014 及 2016 年收集的質心能量為 200 GeV 的金離子金離子對撞實驗數據,藉由測量核抑制因子 (nuclear modification factor, RAA) 來研究 Υ 粒子在金離子金離子對撞實驗中受到夸克膠子電漿態 (quark gluon plasma) 影響而產生的生成抑制現象。
英文摘要 The Solenoid Tracker At RHIC (STAR) is one of the most important high energy nuclear physics experiments in the world and the only on-going experiment at Relativistic Heavy Ion Collider, which is located at Brookhaven National Laboratory. The Muon Telescope Detector (MTD) is dedicated for identifying and triggering muons at STAR and it was installed in 2014. This allows us to study physics using muon final states.
In this thesis, we used the data of Au-Au collision at √sNN =200GeV which is collected in 2014 and 2016 to study the suppression effect for Υ(1, 2, 3S) due to the quark gluon plasma (QGP) created in heavy-ion collisions by measuring the Υ nuclear modification factor (RAA).
論文目次 Abstract in Chinese................................... i
Abstract in English ................................... ii
Acknowledgements................................... iii
Contents......................................... iv
List of Tables ...................................... vii
List of Figures...................................... ix
1. Introduction..................................... 1
2. Theoretical overview ................................ 2
2.1 The Standard Model of particle physics................... 2
2.2 TheΥ mesons................................. 3
2.3 Quark-Gluon Plasma and Nuclear Modification Factor RAA . . . . . . . . . 4
3 Experimentalapparatus ............................... 9
3.1 Relativistic Heavy Ion Collider (RHIC) ................... 9
3.2 The STAR Experiment ............................ 9
3.3 MagnetSystem ................................ 11
3.4 Time Projection Chamber (TPC)....................... 11
3.5 Time-of-Flight (ToF) ............................. 11
3.6 Muon Telescope Detector (MTD)....................... 13
4 Event selections................................... 15
4.1 Data sets and basic selections......................... 15
4.2 Embedding samples.............................. 15
4.3 Selection of muon pT ............................. 16
4.3.1 Muon identification: Straight cut method . . . . . . . . . . . . . . 16
4.3.2 Signal extraction and the selection of muon pT . . . . . . . . . . . 17
5 Measurement of Υ RAA ............................... 20
5.1 Muon identification: Likelihood ratio method . . . . . . . . . . . . . . . . 20
5.2 The Υ signal extraction............................ 24
5.3 Efficiencies correction ............................ 24
5.3.1 Υ kinematic acceptance ....................... 30
5.3.2 TPC tracking efficiency ....................... 31
5.3.3 Υ MTD geometry acceptance .................... 34
5.3.4 MTD related efficiency........................ 34
5.3.5 Muon identification efficiency.................... 36
5.3.6 The efficiency-corrected yields of Υ................. 36
5.4 The upper limit of the number of Υ(3S) ................... 38
5.5 Systematic uncertainties ........................... 40
5.5.1 Signal extraction ........................... 40
5.5.2 TPC tracking efficiency ....................... 41
5.5.3 MTD related efficiency........................ 48
5.5.4 Muon identification efficiency.................... 48
5.5.5 Total uncertainties .......................... 51
5.6 Results..................................... 57
5.7 Futurework.................................. 62
6 Conclusions..................................... 63
References........................................ 64
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