Search for Higgs boson decays to llγ with the CMS detector in proton-proton collisions at √s = 13 TeV with 137 fb-1

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/83547

Title:	Search for Higgs boson decays to llγ with the CMS detector in proton-proton collisions at √s = 13 TeV with 137 fb-1
Authors:	李明晏;Lee, Ming-Yan
Contributors:	物理學系
Keywords:	大強子對撞機;緊湊渺子偵測器;希格斯粒子;稀有希格斯衰變;LHC;CMS;Higgs;rare decay
Date:	2020-07-29
Issue Date:	2020-09-02 15:48:26 (UTC+8)
Publisher:	國立中央大學
Abstract:	本論文研究希格斯粒子衰變至Z玻色子及光子之衰變頻道，其中Z玻色子衰變至雙輕子，雙輕子在此為電子對與渺子對。本分析使用數據為大型強子對撞機之質子-質子對撞於中心質量13兆電子伏特收集於緊湊渺子線圈偵測器，對應光亮度為137fb-1。本分析使用動力學重整(kinematic refit)、終態光子復原 (final state radition photon recovery)及多變量分析 (MultiVariate Analysis)改善分析靈敏度，這些方法相較於以篩選條件為主的分析改善了24%的靈敏度。預測觀測上限在95%信心水準下，可得到1.7倍標準模型觀測值對應於顯著水準1.4 個標準差。;This thesis describes the Higgs decays to dilepton plus one photon with dilepton from the Z pole. This analysis is performed using a dataset recorded by the CMS experiment at the LHC from proton-proton collisions at a center of mass energy of 13TeV corresponding to an integrated luminosity of 137 fb−1. This analysis inte- grated the kinematic refit, final state photon radiation recovery ,and multivariate analysis(MVA) methods to boost the sensitivity. These techniques bring a 24% improvement compare to the cutbased analysis. Limits are set on the cross-section of a standard model Higgs boson for 125GeV at 95% confidence level is about 1.7 times the standard model prediction for the expected results with the p-value corresponding 1.4σ.
Appears in Collections:	[Graduate Institute of Physics] Electronic Thesis & Dissertation

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