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Title: | B介子至η介子和h介子之二體稀有衰變與電荷宇稱對稱破壞之量測 Measurements of Branching fractions and CP Asymmetries of B→ηh decays |
Authors: | Chou Tat Hoi 許祖達 |
Advisor: | 張寶棣(Pao-Ti Chang) |
Keyword: | B介子,η介子,h介子,衰變,電荷宇稱對稱破壞, B meson,η meson,h meson,decay,CPV, |
Publication Year : | 2011 |
Degree: | 碩士 |
Abstract: | 在此篇論文中,我們使用了日本國家高能加速器中心B介子工廠(KEKB) 及其 Belle 偵測器。我們從 772×106 B介子對中分析了 B介子至η介子和h介子之二體稀有衰變與電荷宇稱對稱破壞。其中η介子由兩個光子或三個π介子重組而成。h介子則分別代表了帶電K介子,電π介子和中性K介子。
最後我們在 B->η K 和 B->η π 衰變中找到超過3σ的電荷宇稱對稱破壞徵兆。同時我們也首次量測到 B->η K^0衰變。 We present the improved measurements of the B -> ηh branching fraction and CP asymmetries using a data sample of 711 fb−1 that contains 771.58 million BB pairs collected on Υ(4S) resonance with the Belle detector at the KEKB asymmetric energy e+e− collider. Here h means π±, K± and K0S . And η is selected in η -> γγ and η -> π+π−π0 decays. The evidence of CP asymmetry for B± -> ηK± is found with 3.8 σ, and 3.0 σ in B± -> ηπ± CP asymmetry. The branching fraction of B0 -> ηK0 is observed with 5.4 σ standard deviation from zero. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/9997 |
Fulltext Rights: | 同意授權(全球公開) |
Appears in Collections: | 物理學系 |
Files in This Item:
File | Size | Format | |
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ntu-100-1.pdf | 11.27 MB | Adobe PDF | View/Open |
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