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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 張寶棣(Paoti Chang) | |
| dc.contributor.author | Yu-Wei Chang | en |
| dc.contributor.author | 張育瑋 | zh_TW |
| dc.date.accessioned | 2021-06-14T16:45:59Z | - |
| dc.date.available | 2008-08-06 | |
| dc.date.copyright | 2008-08-06 | |
| dc.date.issued | 2008 | |
| dc.date.submitted | 2008-07-30 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/40373 | - |
| dc.description.abstract | In the study of B → Λ Λbar h, where h stands for π+, K+, K0 ,K∗+, or K∗0, we observe the charmless decays B0 → Λ Λbar K0 and B0 → Λ Λbar K∗0 with a branching fraction of (4.76{+0.84 −0.68(stat.)} ± 0.60(syst.)) × 10−6 and (2.46{+0.87 −0.72(stat.)} ± 0.34(syst.)) × 10−6, respectively. The statistical significance is 12.4σ and
9.4σ for the signal in the low M(ΛΛbar) region. We also report the following branching fractions or 90% confidence level upper limits: B(B+ → Λ Λbar K+) = (3.38{+0.41 −0.36}±0.41)×10−6, B(B+ → Λ Λbar π+) < 0.94×10−6 in M(ΛΛbar) < 2.85 GeV/c2 region, B(B+ → Λ Λbar K∗+) < 5.01 × 10−6 in M(ΛΛbar) < 2.85 GeV/c2 region, and B(B0 → Λ Λbar D0) < 2.73 × 10−5 in whole M(ΛΛbar) region. The important characteristics of the low M(ΛΛbar) enhancements near threshold and the related angular distributions for the observed modes are presented. These results are obtained from a 605 fb−1 data sample collected near the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric energy e+e− collider. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-14T16:45:59Z (GMT). No. of bitstreams: 1 ntu-97-R95222001-1.pdf: 2398772 bytes, checksum: d873294b6cde287938ef4e983f8118b3 (MD5) Previous issue date: 2008 | en |
| dc.description.tableofcontents | Contents
1 Introduction 1 1.1 Standard Model . . . . . . . . . . . . . . . . . . . . 1 1.2 CP violation . . . . . . . . . . . . . . . . . . . . . 2 1.3 CKM matrix . . . . . . . . . . . . . . . . . . . . . . 2 1.4 B mesons . . . . . . . . . . . . . . . . . . . . . . . 3 1.5 Baryonic B decays . . . . . . . . . . . . . . . . . . 3 2 KEK B-Factory 5 2.1 The introduction of Belle Experiment . . . . . . . . . 5 2.2 KEKB Accelerator . . . . . . . . . . . . . . . . . . . 6 2.3 Belle Detector . . . . . . . . . . . . . . . . . . . . 8 2.3.1 Beam pipe . . . . . . . . . . . . . . . . . . . . . 9 2.3.2 Silicon Vertex Detector(SVD) . . . . . . . . . . . 10 2.3.3 Central Drift Chamber(CDC) . . . . . . . . . . . . 11 2.3.4 Time of Flight(TOF) . . . . . . . . . . . . . . . . 12 2.3.5 Aerogel Cherenkov Counter(ACC) . . . . . . . . . . 12 2.3.6 Electromagnetic Calorimeter(ECL) . . . . . . . . . 14 2.3.7 KL and Muon detection system(KLM) . . . . . . . . . 15 2.3.8 Extreme Forward Calorimeter(EFC) . . . . . . . . . 16 3 Analysis Methods 19 3.1 Event selection . . . . . . . . . . . . . . . . . . . 19 3.1.1 Charged Kaon and Pion Selection . . . . . . . . . . 19 3.1.2 Λ reconstruction . . . . . . . . . . . . . . . . . 19 3.1.3 Neutral Kaon Selection . . . . . . . . . . . . . . 20 3.1.4 K∗ reconstruction . . . . . . . . . . . . . . . . . 20 3.1.5 B reconstruction . . . . . . . . . . . . . . . . . 20 3.2 Background suppression methods . . . . . . . . . . . 21 3.2.1 The New Super Fox-Wolfram Method . . . . . . . . . 22 3.2.2 Information from Upsilon(4S) decay . . . . . . . . 24 3.3 Likelihood Ratio . . . . . . . . . . . . . . . . . . 25 3.3.1 Definition . . . . . . . . . . . . . . . . . . . . 25 3.3.2 Optimization of likelihood ratio cut . . . . . . . 25 3.3.3 Multiple Counting . . . . . . . . . . . . . . . . . 25 3.3.4 Likelihood Fit . . . . . . . . . . . . . . . . . . 25 3.4 Study of other backgrounds . . . . . . . . . . . . . 26 3.4.1 Charm background veto . . . . . . . . . . . . . . . 26 3.4.2 Study of Rare B decay background . . . . . . . . . 26 3.5 Branching fraction determination . . . . . . . . . . 27 3.6 Systematic error . . . . . . . . . . . . . . . . . . 27 3.6.1 Number of BBbar Pairs . . . . . . . . . . . . . . . 27 3.6.2 Tracking Uncertainty . . . . . . . . . . . . . . . 27 3.6.3 Charged Proton/Kaon/Pion Identification . . . . . . 27 3.6.4 Λ Reconstruction . . . . . . . . . . . . . . . . . 28 3.6.5 K0 S Reconstruction . . . . . . . . . . . . . . . . . . . . 28 3.6.6 R Selection . . . . . . . . . . . . . . . . . . . . 28 3.6.7 Multiple Counting . . . . . . . . . . . . . . . . . 28 3.6.8 MC Statistic . . . . . . . . . . . . . . . . . . . 28 3.6.9 MC modeling . . . . . . . . . . . . . . . . . . . . 29 4 Physics Results 33 4.1 Introduction . . . . . . . . . . . . . . . . . . . . 33 4.2 Observation and measurement . . . . . . . . . . . . . 34 4.2.1 Data sample . . . . . . . . . . . . . . . . . . . . 34 4.2.2 Background suppression . . . . . . . . . . . . . . 35 4.2.3 efficiency breakdown list . . . . . . . . . . . . . 35 4.2.4 Fitting PDF determination . . . . . . . . . . . . . 35 4.2.5 Physics results . . . . . . . . . . . . . . . . . . 37 4.2.6 Systematic error . . . . . . . . . . . . . . . . . 48 4.2.7 Stability check . . . . . . . . . . . . . . . . . . 52 4.3 Summary . . . . . . . . . . . . . . . . . . . . . . . 58 | |
| dc.language.iso | en | |
| dc.subject | 介子 強子 衰變 粒子物理 高能物理 粒子碰撞 | zh_TW |
| dc.subject | meson baryon decay particle high energy collider Belle | en |
| dc.title | B介子衰變至ΛΛbar K0/K*0之分支比測量 | zh_TW |
| dc.title | Observation and Measurement of B0 to Λ Λbar K0 and B0 to Λ Λbar K*0 decays at Belle | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 96-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.coadvisor | 王名儒(Min-Zu Wang) | |
| dc.contributor.oralexamcommittee | 侯維恕(Wei-Shu Hou),熊怡(Yee Hsiung) | |
| dc.subject.keyword | 介子 強子 衰變 粒子物理 高能物理 粒子碰撞, | zh_TW |
| dc.subject.keyword | meson baryon decay particle high energy collider Belle, | en |
| dc.relation.page | 60 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2008-07-31 | |
| dc.contributor.author-college | 理學院 | zh_TW |
| dc.contributor.author-dept | 物理研究所 | zh_TW |
| 顯示於系所單位： | 物理學系 | |
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