利用CMS探測器測量Wγ的偶合; The measurement of Wγ production in CMS

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/43852

Title:	利用CMS探測器測量Wγ的偶合;The measurement of Wγ production in CMS
Authors:	李學威;Syue-Wei Li
Contributors:	物理研究所
Keywords:	高能實驗;aTGC;CMS;di-boson
Date:	2010-07-11
Issue Date:	2010-12-08 14:23:18 (UTC+8)
Publisher:	國立中央大學
Abstract:	電弱理論包含了玻色子偶合並且適當地描述光子與W玻色子間的偶合。新物理可能影響玻色子自身的交互作用和改變動量的分布（例如：增加cross section，與標準模型比較，光子的橫向動量（pT）增加）。因此，對於Ｗγ的測量可以提供一個好的機會去測試電弱理論的結構。這篇論文利用CMS探測器分析Ｗγ的cross section並選擇W衰變為電子當作訊號事件。這篇論文也利用數據分析去估算背景事件。最後，Ｗγ的測量cross section為12.5±2.0（系統誤差）pb。 The electroweak (EW) theory includes the tri-linear vector boson coupling and well describes the coupling of the photon to the W boson. New physics may affect the self-interactions of vector bosons and alter the kinematic distributions, for example, enhanced cross section and higher photon pT excess as compared to the Standard Model. Thus, the measurements of Wγ production provide a good opportunity to test the structure of the non-Abelian character of EW theory. This thesis presents a study for the cross-section measurement of Wγ production with electron and photon in final state at CMS at sqrt(s) = 10 TeV. A data-driven method of estimating background is also shown and the measured cross-section of Wγ production is 12.5 ± 2.0 (syst.) pb.
Appears in Collections:	[物理研究所] 博碩士論文

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