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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/7461


    Title: 費米實驗室CDFII探測器利用J/psi J/psi 衰變途徑尋找eta_b粒子之研究;Search for ηb in the exclusive decay modes of J/ψ J/ψ at CDF II Fermilab
    Authors: 楊毅;Yi Yang
    Contributors: 物理研究所
    Keywords: 費米實驗室;Fermilab CDF
    Date: 2006-06-23
    Issue Date: 2009-09-22 10:58:16 (UTC+8)
    Publisher: 國立中央大學圖書館
    Abstract: 本篇論文是使用美國費米加速器實驗室CDF探測器之1.1fb 數據,利用兩個J/ψ 都衰變至兩個muon之途徑尋找ηb粒子。我們發現有3 個候選事例包括3.6 個背景 事例在我們的搜尋範圍內(9.0 至9.5GeV)。而本篇論文我們給出了ηb的生成截 面,相對於從B強子來的J/ψ的生成截面: 5.0 10 3 ?In this thesis, we present the search for eta_b in CDF by looking into the exclusive eta_b decays into two J/psi where both J/psi decay into di-muon. Using the 1.1 fb^-1 data, we observed 3 candidate events with expected 3.6 background events in the search window, 9.0 to 9.5 GeV. The eta _b production cross section, in relative to the cross section of b-Hadron decay to J/psi X, is measured in this analysis. The upper limit for eta_b production cross section with rapidity |y|<0.6, when multiplied by the decay branching fractions, is found to be < 5.0 * 10^-3
    Appears in Collections:[物理研究所] 博碩士論文

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