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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/60733

    Title: Search for Pair Production of t*-> t + photon : Estimation of Photon Purity and Study of the Top and W Mass Resolution
    Authors: 蔡芳英;Tsai,Fang-Ying
    Contributors: 物理學系
    Keywords: 自旋3/2頂垮克;pair production of t* to top+photon
    Date: 2013-07-22
    Issue Date: 2013-08-22 11:47:07 (UTC+8)
    Publisher: 國立中央大學
    Abstract: Randall-Sundrum模型提供一個合理的方式解釋新物理和Higgs Boson重量的超大修正,並且預測了一個最輕自旋數為3/2的Kaluza-Klein粒子。我們利用LHC的能量尺度找尋經由pair-production產生的帶有自旋3/2的右旋頂垮克。本篇論文在19.6 fb^(-1)的質子質子對撞數據且總碰撞能量為8 TeV下,利用χ^2 sorting的方法重建t* 粒子, 此方法包含了找mass resolution的值和neutrino在z方向動量正確率最高的解。我們可以利用 χ^2和 Likelihood fitter 去估計data裡那些從標準模型來的主要背景干擾數量。我們利用質心能量在7TeV且數量為2.4到35.9pb^(-1)的單光子數據,來測試這兩種估計方法的正確性。
    Randall-Sundrum model provides a reasonable way to explain the hierarchy problem and it predicts the lightest spin-3/2 Kaluza-Klein particle. We are searching for the singlet top of spin-3/2 through pair-production that may be produced at LHC energies. This thesis presents the χ^2 sorting method, which includes studies of mass resolution and the probability of getting correct solution of neutrino pz to reconstruct spin-3/2 particle at √s=8 TeV using 19.6 fb^(-1)of proton-proton collision data collected by CMS. In order to estimate dominated background in data, we also provide two methods, χ^2 fitter and Likelihood fitter. These methods use inclusive photon at √s=7 TeV and the data sample corresponds from 2.4 to 35.9 pb^(-1).
    Appears in Collections:[物理研究所] 博碩士論文

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