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

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

陳冠昕(Kuan-Hsin Chen)

指導教授 ： 郭家銘

國立中央大學/理學院/物理學系/博士(2014年)

摘要

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。

關鍵字

光子 ； Z玻色子 ； 標準模型 ； 高能物理

並列摘要

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.

並列關鍵字

CMS ； LHC ； Standard Model ； Zγ

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