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Title: | B介子至強子二體稀有衰變之量測與B介子衰變至K介子與π介子的直接電荷宇稱對稱破壞之證據 Measurement of Charmless Hadronic Two-Body Rare B Meson Decays and Evidence of Direct CP Violation in B -> K+pi- at Belle |
Authors: | Yuan Chao 趙元 |
Advisor: | 張寶棣(Paoti Chang) |
Keyword: | B介子,稀有衰變,直接電荷宇稱對稱破壞,Belle偵測器,衰變分支比, B meson,B physics,direct cp violation,DCPV,rare decay,Belle Detector,KEK,branching fraction, |
Publication Year : | 2005 |
Degree: | 博士 |
Abstract: | 基於Belle偵測器所收集到253/fb的資料,我們量測了B介子至不含魅夸克的強子之稀有二體衰變,其中包含了K與π介子兩種強子。在這些衰變模式中,測量了它們衰變分支比以及直接電荷宇稱的不對稱性。基於3.9個標準差,我們得到了B介子衰變至K介子與π介子的直接電荷宇稱對稱破壞之證據。同時,以5.8個標準差的信心水準,我們觀測到了B介子衰變至兩個中性π介子的衰變模式。 With integrated luminosity 253/fb data acquired at Belle, we have studied two body charmless hadronic B-> h h decay modes, where h stands for charged or neutral K/pi mesons. Among these modes, we have measured the branching fractions and charge asymmetries. The evidence of charge asymmetry for B^0 -> K^+pi^- is found with 3.9 sigma and the branching fraction of B^0 -> pi^0 pi^0 is observed with 5.8 sigma standard deviation from zero. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/36387 |
Fulltext Rights: | 有償授權 |
Appears in Collections: | 物理學系 |
Files in This Item:
File | Size | Format | |
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ntu-94-1.pdf Restricted Access | 6.88 MB | Adobe PDF |
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