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

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姓名

楊毅(Yi Yang) 查詢紙本館藏

畢業系所

物理學系

論文名稱

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 decaymodes of J/ψ J/ψ at CDF II Fermilab )

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摘要(中)

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

摘要(英)

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

關鍵字(中)

★ 費米實驗室

關鍵字(英)

★ Fermilab CDF

論文目次

1. Introduction 1
2. Experimental Apparatus 9
3. Analysis 47
4. Conclusion 83
Bibilography 87
A. Analysis for the eta_b -> J/psi J/psi Channel (Mode 3) 90
B. Analysis for the eta_b -> J/psi phi Channel (Mode 3) 103
C. Toy Mote Carlo Testing 109
D. Projection of J/psi Fit Results 113
E. Statistic 123

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指導教授

李世昌(Shih-Chang Lee)

審核日期

2006-7-14

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