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研究生:李彥頡
研究生(外文):Yen-Jie Lee
論文名稱:B介子衰變至超子的發現
論文名稱(外文):Measurement of Charmless Hyperonic B Decays at BELLE
指導教授:王名儒
指導教授(外文):Min-Zu Wang
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:物理研究所
學門:自然科學學門
學類:物理學類
論文種類:學術論文
論文出版年:2004
畢業學年度:92
語文別:英文
論文頁數:108
中文關鍵詞:衰變重子B介子超子高能B工廠時間對稱性破壞稀有衰變CP破壞
外文關鍵詞:baryonBelleKEKLambdahyperonic decayCP violationbaryonic decayT violationhigh energy physicsB mesonB factoryhyperonhyperonic decaycharmless decayrare decay
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  本篇論文乃是在尋找B介子衰變至超子的稀有衰變。所使用的實驗數據是由位於日本國家高能加速器中心B介子工廠(KEKB)的Belle偵測器由不對稱能量的正負電子對撞所取得的。
  我們首度發現B^0->pΛbar π^-以及B^+->ΛΛbar K^+這兩種特殊的稀有衰變。而其衰變分率各為(3.97+1.00-0.80±0.56) × 10^-6以及(2.91+0.90-0.70±0.38) × 10^-6。而相關的B0�郭齮NK-,B0�郭齮U0π-以及B+�都NΛπ+衰變其信號尚不明顯。我們分別給予90%信心水準的衰變分率上限各為: < 8.2 × 10^-7 , < 3.8 × 10^-6以及 < 2.8 × 10^-6。
We report the first observation of the charmless hyperonic B decays, B^0-->pΛbar π^- and B^+ --> Λ Λbar K^+ using a data sample recorded at the Upsilon(4S) resonance
with the Belle detector at KEKB. The measured branching fractions are B(B^0 --> p Λbar π^- ) = (3.97+1.00
-0.80 +- 0.56) x 10^-6 and B(B^+ --> Λ Λbar K^+) =
(2.91+0.90-0.70 +- 0.38) x 10^-6. We also perform a search for the related decay modes B^0--> p Λbar K^-, B^0--> pΣ^0bar π^- , and B^+ --> Λ Λbar π^+, but do not find significant signals. We set 90% confidence-level upper limit for these modes: B(B^0--> p Λbar K^-)< 8.2x10^-7 , B(pΣ^0bar π^- ) < 3.8x10^-6 and B(B^+ --> Λ Λbar π^+) < 2.8x10^-6.
Chapter 1 Introduction -----------------------1
Chapter 2 KEK B-Factory ----------------------9
Chapter 3 Analysis Method --------------------25
Chapter 4 Observation of B^0--> pΛπ- --------34
Chapter 5 Observation of B+ --> ΛΛ K+--------60
Chapter 6 Conclusions and Prospects ----------91
Appendix A Λ selection systematic error -----103
Appendix B Published papers------------------108
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