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研究生: 王 晨
Wang, Chen
論文名稱: 在大型強子對撞機上探討類軸子粒子及規範玻色子之耦合使用 Z 玻色子的共同產生過程
Probing the Gauge-boson Couplings of Axion-like Particle with Associated Production Process of Z Boson at the LHC
指導教授: 張敬民
Cheung, Kingman
口試委員: 曾柏彥
Tseng, Po-Yan
陳傳仁
Chen, Chuan-Ren
學位類別: 碩士
Master
系所名稱: 理學院 - 物理學系
Department of Physics
論文出版年: 2024
畢業學年度: 112
語文別: 英文
論文頁數: 34
中文關鍵詞: 粒子物理類軸子粒子大強子對撞機
外文關鍵詞: Particle Physics, ALP, LHC
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  • 本文探討了類軸子粒子與電弱規範波色子的耦合常數$g_{aZZ}$和$g_{aZ\gamma}$。在質心能量14兆電子伏特和目前運行(高光度大型強子對撞機)總光度300逆飛靶(3000逆飛靶)情況下,相關產生過程$pp \to Za \to l^+l^-\gamma \gamma$被考慮。我們展示了在類軸子粒子質量1吉電子伏特到100吉電子伏特區間,兩個耦合係數的靈敏度曲線都比現有約束有著一個數量級的進步。總而言之,本研究強調了此被調查的通道對於限制在未來大型強子對撞機中類軸子粒子耦合的重要性,並提供了對未來類軸子粒子探測實驗的重要資訊。


    This thesis explores the coupling constants, $g_{aZZ}$ and $g_{aZ\gamma}$, of an axion-like particle (ALP) with the electroweak gauge bosons. With center-of-mass energy $\sqrt{s}=14~\text{TeV}$ and integrated luminosities $\mathcal{L}=300~\text{fb}^{-1}$ ($3000~\text{fb}^{-1}$), current run (High-Luminosity LHC), the associated production process $pp \to Za \to l^+l^-\gamma \gamma$ is considered. We show the better sensitivity curves than current limit with one order improvement for both couplings in the mass range of $M_a=1~\text{GeV}-100~\text{GeV}$. As a conclusion, this work highlights how important the examined channels are for limiting the ALP couplings at the future LHC and provides important information for upcoming ALP detection experiments.

    Contents ii List of Tables iv List of Figures v 1 Introduction 1 2 The ALP Model 4 3 Constraints 7 3.1 Z boson decay width 7 3.2 LEP 8 3.3 Triboson 8 3.4 Nonresonant ZZ production 8 3.5 Nonresonant ggF 9 3.6 Photons 9 4 Experiment and Simulation 10 4.1 Events Generation and Simulation 10 4.2 Signal Events 11 4.3 Background Events 14 4.4 Selection Procedures 15 4.4.1 Large mass region 15 4.4.2 Small mass region 18 5 Numerical Result 23 6 Conclusion 29 References 34

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