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| 研究生： |
楊毅 Yi Yang |
|---|---|
| 論文名稱： |
費米實驗室CDFII探測器利用J/psi J/psi Search for ηb in the exclusive decaymodes of J/ψ J/ψ at CDF II Fermilab |
| 指導教授： |
李世昌
Shih-Chang Lee |
| 口試委員: | |
| 學位類別： |
碩士 Master |
| 系所名稱： |
理學院 - 物理學系 Department of Physics |
| 畢業學年度： | 94 |
| 語文別： | 英文 |
| 論文頁數： | 126 |
| 中文關鍵詞： | 費米實驗室 |
| 外文關鍵詞： | Fermilab CDF |
| 相關次數： | 點閱：16 下載：0 |
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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
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