Measurement of Zγ production in 5 fb-1 of pp collisions at √s = 7 TeV with the CMS detector

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/66101

Title:	Measurement of Zγ production in 5 fb-1 of pp collisions at √s = 7 TeV with the CMS detector
Authors:	陳冠昕;Chen,Kuan-Hsin
Contributors:	物理學系
Keywords:	光子;Z玻色子;標準模型;高能物理;CMS;LHC;Standard Model;Zγ
Date:	2014-10-09
Issue Date:	2014-11-24 15:21:39 (UTC+8)
Publisher:	國立中央大學
Abstract:	本篇論文呈現了使用質子-質子對撞、中心能量在7 TeV的 Zγ 生產截面積的量測。其使用的數據為由LHC產生，由CMS偵測器所蒐集得到，其累積光度為5.0 fb-1。此產生截面積量測是針對光子橫向能量大於15 GeV、光子與電子空間分離ΔR(e,γ)大於0.7且電子對的恆定質量大於50 GeV。量測的碰撞產生截面為5.20 ± 0.32(系統誤差) ± 0.32(系統誤差) ± 0.11(光度誤差) pb。結果與標準模型的預測相吻合。;Measurements of Zγ production cross section in proton-proton collisions at √s =7 TeV are presented. The results are based on data recorded by the CMS detector at the LHC that correspond to an integrated luminosity of 5.0 fb−1. The cross sections are measured for photon transverse energy > 15 GeV, and for separations between photons and ﬁnal-state electrons in the pseudorapidity-azimuthal plane of ΔR(e, γ) > 0.7 in eeγ ﬁnal state. A dielectron invariant mass requirement of di-electron pair > 50 GeV is imposed. The σ(pp → Zγ) × B(Z → e+ e−) is measured to be 5.20 ± 0.13(stat) ± 0.32(syst) ± 0.11(lum) pb. The results are consistent with predictions from the standard model.
Appears in Collections:	[Graduate Institute of Physics] Electronic Thesis & Dissertation

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