none Study of Zγ-> e+e-γ Process with CMS Detector at Large Hadron Collider

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/7606

Title:	none Study of Zγ-> e+e-γ Process with CMS Detector at Large Hadron Collider
Authors:	吳靖涵;Jing-Han Wu
Contributors:	物理研究所
Keywords:	大強子對撞機;LHC;CMS
Date:	2009-07-03
Issue Date:	2009-09-22 11:00:42 (UTC+8)
Publisher:	國立中央大學圖書館
Abstract:	本篇論文模擬歐洲大強子對撞機在質心能量為14兆電子伏特高能量的運作下，利用CMS偵測器量測對撞產生Z0γ衰變為e+e-γ的事件。文中所使用的蒙地卡羅數據資料經由事件產生器和CMS套裝軟體完整的模擬實際碰撞情況，其中CMS軟體包含了：模擬粒子與偵測器的作用，以及偵測訊號的數位化處理。我們考慮的大量的背景樣本使模擬條件更接近真實情況。所選取的事件在CMS偵測器涵蓋範圍內，Z0衰變產生的電子橫向動量需大於10 GeV/c且所選的光子的橫向動量也需大於20 GeV/c。我們量測到在1 fb-1數據資料中230.00個訊號事件以及126個背景事件通過所使用的選擇條件。其中Z+jets支配了117個背景事件，支配92.86%的背景事件為主要的背景來源。此事件統計上的意義經公式計算得到16.40。因此，利用大強子對撞機運作初期所產生的0.1 fb-1的實驗數據即可量測統計意義大於5的Z0γ事件。 We present a simulation of pp?Z0γ process with the e+e-γ final state at using Compact Muon Solenoid detector at Large Hadron Collider. The Monte Carlo samples are fully simulated through the event generator and CMSSW that includes the detector simulation and digitization. In order to achieve realism, we consider a large set of background samples to in this study. The electrons from Z decay are selected with PTe > 10 GeV/c and the photon is selected with PTγ> 20 GeV/c within the coverage of CMS detector. There are 230 signal events and 126 background events measured after the Zγ selection criteria at 1 fb-1. There are 117 background event form Z+jets process that dominates 92.86 % of the background contribution. The significance is calculated to be 16.40. As a result, the Z0γ process can be established with the signal statistical sensitivity better than 5σ in the early phase of LHC with the integrated luminosity of 0.1 fb-1.
Appears in Collections:	[Graduate Institute of Physics] Electronic Thesis & Dissertation

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