none Study of the process: pp→Z0Z0→μ+μ-μ+μ- at CMS

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题名:	none Study of the process: pp→Z0Z0→μ+μ-μ+μ- at CMS
作者:	許峪銘;Yu-ming Hsu
贡献者:	物理研究所
关键词:	希格斯粒子;大型強子對撞機;Higgs particle;Large Hadron Collider
日期:	2008-07-07
上传时间:	2009-09-22 10:59:24 (UTC+8)
出版者:	國立中央大學圖書館
摘要:	希格斯機制(Higgs Mechanism)是由彼得?希格斯於西元1964年所提出來用以解釋一般的基本粒子與較特別的玻色子W±和Z0的質量來源。在2008年以前，尚未有任何一個實驗可以直接地探測到希格斯粒子，然而，這個情形可能隨著將在2008年歐洲粒子物理研究中心的大型強子對撞機的開始運作而有所改變。研究於大型強子對撞機的pp→Z0Z0→μ+μ-μ+μ- 此衰變過程是尋找希格斯玻色子衰變過程時的其中一種背景過程，透過對這個過程的研究將會對於分辨希格斯玻色子衰變與其它的背景衰變有所幫助。為了能夠更準確的分析真實的數據樣本，預先發展一套合理的分析步驟是非常重要的。在此篇論文中，CMS的觀測能力與pp→Z0Z0→μ+μ-μ+μ- 衰變過程的研究將藉由完整地模擬訊號與背景事件的蒙地卡羅數據樣本來提供，而從此實驗分析的結果，在每fb-1下約每5.98個pp→Z0Z0→μ+μ-μ+μ-訊號事件會有0.53個背景事件，此處的背景事件主要是的衰變過程(0.15events/ fb-1)。 The Higgs Mechanism, which explains the origin of mass of elementary particles in general and of the W± and Z0 bosons in particular, was theorized in 1964 by Peter Higgs. Before 2008, there has been not any experiment which can directly detect the Higgs particle. However, this situation may change with the operation of the Large Hadron Collider at CERN which is going to start in 2008. The pp→Z0Z0→μ+μ-μ+μ- process studied at Large Hadron Collider is one of the background processes for searching the signal Higgs boson decaying processes. The study of this process will help to distinguish the Higgs boson decaying process from other background processes. In order to be more precise to analyze the real-data samples, it is important to develop a reasonable set of analyzing steps. From the contents of this thesis, the CMS potential for the observation and study of the pp→Z0Z0→μ+μ-μ+μ- process is provided with fully-simulated signal and background Monte-Carlo data samples. From the final results of the data analysis in the experiment, there are about 5.98 pp→Z0Z0→μ+μ-μ+μ- signal events with 0.53 background events per fb-1 expected, where the background is dominated mainly by the process (0.15events/ fb-1) with four final-state muons.
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