在CMS探測器中觀察雙光子伴隨雙噴流電弱產生過程之靈敏度研究

Abstract

本研究探討在兩光子（diphoton）與兩噴流（2-jet）產生過程中觀察電弱（electroweak）產物的靈敏度。分析使用 CMS 實驗在大型強子對撞機（LHC）上以中心質量能量 √s = 13 TeV 進行的模擬質子-質子碰撞事件，並設計選擇準則以增強電弱訊號相較於主要的強作用（strong interaction）背景。電弱成分透過對雙噴流不變質量 mjj 及贗快度差 ∆η 分布進行模板擬合（template fit）來提取，並選取最佳化的相空間以提高訊號靈敏度。本研究評估不同選擇策略下的統計顯著性，並探討分離電弱貢獻的可行性。結果不僅驗證了模板擬合方法的有效性，亦可作為未來實驗測量的重要參考。

This study presents an investigation of the sensitivity to the electroweak production of a diphoton system accompanied by two jets. The analysis uses simulated proton-proton collision events at a center-of-mass energy of √s = 13 TeV, generated by the CMS experiment at the Large Hadron Collider. Event selections are optimized to enhance the electroweak signal over the dominant strong interaction background. The electroweak contribution is determined via a template fit to the dijet invariant mass (mjj) and pseudorapidity separation (∆η) distributions within a fiducial phase space chosen to maximize signal sensitivity. The study evaluates the expected statistical significance of the signal under different selection strategies and assesses the feasibility of isolating the electroweak contribution. The results provide insight into the effectiveness of the template fitting method and serve as a baseline for future experimental measurements.