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

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:	[Graduate Institute of Physics] Electronic Thesis & Dissertation

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