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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 王名儒(Min-Zu Wang) | |
| dc.contributor.author | Jui-Te Wei | en |
| dc.contributor.author | 魏瑞德 | zh_TW |
| dc.date.accessioned | 2021-06-14T17:20:50Z | - |
| dc.date.available | 2008-09-02 | |
| dc.date.copyright | 2008-09-02 | |
| dc.date.issued | 2008 | |
| dc.date.submitted | 2008-07-24 | |
| dc.identifier.citation | [1] The particle Adventure
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/41161 | - |
| dc.description.abstract | B+->p‾pK+ and B+->p‾pπ+
We study the characteristics of the low mass p‾p enhancement near threshold in the baryonic B decays: B+->p‾pK+ and B+->p‾pπ+. We observe that the proton polar angle distributions in the p‾p helicity frame in the two decays have the opposite polarity, and measure the forward-backward asymmetries as a function of the p‾p mass for the p‾pK+ mode. We also search for the intermediate two-body decays, B+->‾p ++ and B+->p‾ 0, and set upper limits on their branching fractions: B(B+->‾p ++) < 0.14 × 10^-6 and B(B+->p‾ 0) < 1.38×10^-6. These results are obtained from a data sample of 449 million BB pairs collected near the Upsilon(4S) resonance with the Belle detector at KEKB. B+->p‾Λγ, p‾Λπ0 and B0->p‾Λπ− To further understand the mechanism in the low p‾p mass for baryonic B decays. We review the study of B+->p‾Λγ, p‾Λπ0 and B0->p‾Λπ− done by Y.-J. Lee (NTUHEP group) in 2006. The branching fractions and angular distributions of the three decays are remeasured with the same data sample, and the results are consistent with Lee’s study. In adition, we also measure the anisotropy parameter ‾α of the secondary proton from decays. The results are ‾α(B+->p‾Λγ) = −0.57 ± 0.33(stat) ± 0.10(syst), ‾α(B+->p‾Λπ0) = −0.27 ± 0.33(stat) ± 0.10(syst), and ‾α(B+->p‾Λπ−) = −0.28 ± 0.21(stat) ± 0.10(syst). B->πℓ+ℓ− We also present a search for the B+->π+ℓ+ℓ− and B0->π0ℓ+ℓ− decays, with a data sample of 657 million BB pairs. By performing maximum likelihood fits to the reconstructed candidates, no significant signal is observed and we set the upper limit on the isospin-averaged branching fraction B(B->πℓ+ℓ−) < 6.2 × 10^-8 at the 90% confidence level. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-14T17:20:50Z (GMT). No. of bitstreams: 1 ntu-97-R94222073-1.pdf: 1321531 bytes, checksum: 9be004ffa35cc7b221013c725d3521d4 (MD5) Previous issue date: 2008 | en |
| dc.description.tableofcontents | 1 Introduction 1
1.1 Particle Physics . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 The Standard Model . . . . . . . . . . . . . . . . . . . . . . . 2 1.2.1 CKM matrix . . . . . . . . . . . . . . . . . . . . . . . 2 1.2.2 CP violation . . . . . . . . . . . . . . . . . . . . . . . 4 1.3 Motivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.3.1 B meson . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.3.2 Baryonic B decays . . . . . . . . . . . . . . . . . . . . 5 1.3.3 Leptonic B decays . . . . . . . . . . . . . . . . . . . . 6 2 KEK B-Factory 9 2.1 KEKB Accelerator . . . . . . . . . . . . . . . . . . . . . . . . 9 2.2 Belle Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.2.1 Beam Pipe . . . . . . . . . . . . . . . . . . . . . . . . . 12 2.2.2 Silicon Vertex Detector (SVD) . . . . . . . . . . . . . . 13 2.2.3 Extreme Forward Calorimeter (EFC) . . . . . . . . . . 14 2.2.4 Central Drift Chamber (CDC) . . . . . . . . . . . . . . 16 2.2.5 Aerogel Cherenkov counter system (ACC) . . . . . . . 18 2.2.6 Time-of-Flight Counters (TOF) . . . . . . . . . . . . . 19 2.2.7 Electromagnetic Calorimeter (ECL) . . . . . . . . . . . 22 2.2.8 KL and Muon Detector (KLM) . . . . . . . . . . . . . 24 3 Analysis Method 27 3.1 Analysis Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 3.1.1 BASF . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 3.1.2 EvtGen and GSIM . . . . . . . . . . . . . . . . . . . . 27 3.1.3 PAW, Mn Fit and MINUIT . . . . . . . . . . . . . . . 29 3.2 B Meson Reconstruction . . . . . . . . . . . . . . . . . . . . . 30 3.3 Background Suppression . . . . . . . . . . . . . . . . . . . . . 32 3.3.1 Event shape variables . . . . . . . . . . . . . . . . . . . 33 3.3.2 Fisher discriminant . . . . . . . . . . . . . . . . . . . . 35 3.3.3 KSFW and BB suppression . . . . . . . . . . . . . . . 36 3.3.4 Peaking background veto . . . . . . . . . . . . . . . . . 39 3.4 Figure of Merit . . . . . . . . . . . . . . . . . . . . . . . . . . 40 3.5 Extraction of Signals . . . . . . . . . . . . . . . . . . . . . . . 43 3.6 Systematic Study . . . . . . . . . . . . . . . . . . . . . . . . . 47 4 Physics Results 51 4.1 p‾pK+ and p‾pπ+ Study . . . . . . . . . . . . . . . . . . . . . . 51 4.1.1 BF Measurement and Mp‾p Distribution . . . . . . . . . 53 4.1.2 Angular Distribution . . . . . . . . . . . . . . . . . . . 53 4.1.3 Search for Two-body B Decays . . . . . . . . . . . . . 57 4.1.4 CP Violation . . . . . . . . . . . . . . . . . . . . . . . 58 4.2 B->p‾Λγ, p‾Λπ0 and p‾Λπ− Checks . . . . . . . . . . . . . . . . . . . 59 4.2.1 Anisotropy parameter ‾α . . . . . . . . . . . . . . . . . 59 4.3 Search for B->πℓ+ℓ− . . . . . . . . . . . . . . . . . . . . . . 63 4.4 Discussion and Conclusion . . . . . . . . . . . . . . . . . . . . 65 4.4.1 Baryonic B decays . . . . . . . . . . . . . . . . . . . . 65 4.4.2 Search for B->πℓ+ℓ− decay . . . . . . . . . . . . . . . 67 A Published Papers 75 | |
| dc.language.iso | en | |
| dc.subject | 高能實驗 | zh_TW |
| dc.subject | B介子 | zh_TW |
| dc.subject | high energy physics | en |
| dc.subject | B meson | en |
| dc.subject | hep | en |
| dc.title | B介子衰變至p pbar K/π之研析與尋找B->πll衰變 | zh_TW |
| dc.title | Study of the B decays B->ppK/πand Search for B->πll decay | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 96-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 張寶棣(Paoti Chang),侯維恕(Wei-Shu Hou),熊怡(Yee Hsiung) | |
| dc.subject.keyword | B介子,高能實驗, | zh_TW |
| dc.subject.keyword | B meson,hep,high energy physics, | en |
| dc.relation.page | 75 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2008-07-26 | |
| 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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