請用此 Handle URI 來引用此文件：
http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/48466完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 張寶棣(Pao-Ti Chang) | |
| dc.contributor.author | Yen-Wei Tung | en |
| dc.contributor.author | 董彥緯 | zh_TW |
| dc.date.accessioned | 2021-06-15T06:57:58Z | - |
| dc.date.available | 2012-02-20 | |
| dc.date.copyright | 2011-02-20 | |
| dc.date.issued | 2011 | |
| dc.date.submitted | 2011-01-27 | |
| dc.identifier.citation | [1] M. Herrero,”THE STANDARD MODEL”, arXiv:hep-ph/98122242
[2] T.D. Lee, C.N. Yang ,”Question of Parity Conservation in Weak Inter-action”, Phys. Rev. 104, 254258 (1956). [3] C.S. Wu ,”Experimental Test of Parity Conservation in Beta decay”, Phys. Rev. 105, 14131415 (1957). [4] J.H. Christenson, et al.,”Evidence for the 2π decay of the K0S meson”, Phys. Rev. Lett. 13, 128140 (1964). [5] Makoto Kobayashi and ToshihideMaskawa, ”CP-Violation in the Renor-malizable Theory ofWeak Interaction”, Prog. Theor. Phys. Vol. 49 Page 652 (1972). [6] S. W. Herb, D. C. Hom, L. M. Lederman, J. C. Sens, H. D. Snyder, and J. K. Yoh, ”Observation of a Dimuon Resonance at 9.5 GeV in 400-GeV Proton-Nucleus Collisions”, Phys. Rev. Lett. 39, 252255 (1977). [7] M. Hazumi, Phys. Lett. B 583, 285 (2004). [8] S. Kurokawa, E. Kikutani, ”Overview of the KEKB accelerators”, Nu-clear Instruments and Methods in Physics Research A 499 (2003) 1-7. [9] M. T. Cheng et al. Letter of intent for a study of CP violation in B meson decays; KEK Report, 94-2 1994 [10] http://nobelprize.org/nobelprizes/physics/laureates/2008/ [11] A. Abashian et al. (Belle Collaboration), Nucl. Instr. and Meth. A 479, 117 (2002). [12] BELLE HOME PAGE http://belle.kek.jp [13] A. Abashian et al. Nucl. Instr. and Meth. A 491, 69-82 (2002). [14] The EvtGen home page http://www.slac.standford.edu/lange/EvtGen/ [15] GEANT - Detector Description and Simulation Tool http://wwwasd.web.cern.ch/wwwasd/geant/index.html [16] Particle data group http://pdg.lbl.gov [17] F.Fang, Study of KS ! π+π− Selection, Belle Note 323 (2000). [18] Geoffray C. Fox and Stephen Wolfram, Phys. Rev. Lett. 41, 1581 - 1585 (1978). [19] Y. T. Shen , ”Improve Measurements of Branching Fraction and CP Asymmetry in B to ϕϕK Decays”, Belle Note 941 (2006). [20] B. Aubert et al. (BABAR Collaboration), Phys. Rev. D81:051101, 2010. [21] G. Punzi (2003), physics/0308063. [22] H. Albrecht et al. (ARGUS Collaboration), Phys. Lett. B 229, 304 (1989). [23] S-wave Breit Wigner distribution http://en.wikipedia.org/wiki/Cauchy distribution [24] B. Bhuyan, Tracking Systematics: Using Partially reconstructed D∗ Decays, Belle Analysis Meeting (09/20/2010). [25] S. Nishida, Study of Kaon and Pion Identification Using Inclusive D* Sample, Belle Note 779 (2005). [26] S.W. Lin, P. Chang, Br. of hh with 449 million BB pairs, Belle Note 901 (2006). [27] Search for CP-violating charge asymmetry in B± to J/ψK± http://belle.kek.jp/results/summer10/b2jpsik/ | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/48466 | - |
| dc.description.abstract | 在本論文中，我們利用772百萬個BB介子對，觀測B0介子衰變至ϕϕK0的分支比。藉由日本國家高能加速器中心B介子工廠貝爾偵測器，所產生目前世界最多的觀測數據，我們首度證實了B0到ϕϕK0的衰變確實存在，訊號的顯著性為6.0個標準差，且其衰變的分支比為
BF(B0到ϕϕK0) = (2.86 +0.81-0.70(統計誤差) +-0.20(系統誤差))×10^(-6)我們同時研究B介子衰變至末態五個K介子之分支比： 不含c夸克的衰變：B→ϕϕ K，ϕK+ K- K，K+ -K- K+ K- K 包含c垮克的衰變：B±→ηcK±；ηc到ϕϕ，ϕK+ K-，K+ K- K+ K- B±→J/ψK±；J/ψ→ϕK+ K-，K+ K- K+ K- 我們也證實了以上的衰變均確實存在，但對於帶正負電B介子的衰變，並無明顯的量測到電荷宇稱之不對稱性。 而在ηc衰變至K+ K- K+ K-的研究中，我們也測量了ηc的自然寬度，其寬度 = 39.54 +7.37-6.35(統計誤差) +-2.29(系統誤差) MeV/c2 | zh_TW |
| dc.description.provenance | Made available in DSpace on 2021-06-15T06:57:58Z (GMT). No. of bitstreams: 1 ntu-100-R96222051-1.pdf: 15527920 bytes, checksum: 658711813393b53ebd280d6bd05ed704 (MD5) Previous issue date: 2011 | en |
| dc.description.tableofcontents | 1 Particle Physics 1
1.1 Standard Model . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 CP violation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.3 CKM matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.4 Υ and B mesons . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.5 Motivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2 KEK B-Factory 7 2.1 KEKB Accelerator . . . . . . . . . . . . . . . . . . . . . . . . 7 2.2 Belle Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.2.1 Beam Pipe . . . . . . . . . . . . . . . . . . . . . . . . . 13 2.2.2 Silicon Vertex Detector (SVD) . . . . . . . . . . . . . . 14 2.2.3 Extreme Forward Calorimeter (EFC) . . . . . . . . . . 15 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) . . . . . . . . . . . . . 21 2.2.7 Electromagnetic Calorimeter (ECL) . . . . . . . . . . . 23 2.2.8 KL and Muon Detector (KLM) . . . . . . . . . . . . . 24 2.2.9 Solenoid and Iron Yoke . . . . . . . . . . . . . . . . . . 25 3 Analysis Method 27 3.1 Basic Event Selection . . . . . . . . . . . . . . . . . . . . . . . 27 3.1.1 Charged Tracks Selection . . . . . . . . . . . . . . . . . 28 3.1.2 K/π Identification . . . . . . . . . . . . . . . . . . . . 29 3.1.3 K0 Selection . . . . . . . . . . . . . . . . . . . . . . . . 29 3.1.4 Reconstruction of B Candidates . . . . . . . . . . . . . 30 3.2 Continuum Background Suppression . . . . . . . . . . . . . . 32 3.2.1 Event Shape Variables . . . . . . . . . . . . . . . . . . 32 3.2.2 Fisher Discriminant . . . . . . . . . . . . . . . . . . . . 34 3.2.3 Likelihood Ratio (LR) and LR Optimization . . . . . . 35 3.3 BB Background Study . . . . . . . . . . . . . . . . . . . . . . 41 3.4 B→K+K−K+K−Kπ Background . . . . . . . . . . . . . . . 43 3.5 Branching Fraction . . . . . . . . . . . . . . . . . . . . . . . . 44 3.5.1 The definition . . . . . . . . . . . . . . . . . . . . . . . 44 3.5.2 Signal extraction . . . . . . . . . . . . . . . . . . . . . 44 3.5.3 PDF correction . . . . . . . . . . . . . . . . . . . . . . 45 3.6 The Error Study . . . . . . . . . . . . . . . . . . . . . . . . . 48 4 The Measurement of Charmless B→ϕϕK Decays 49 4.1 Date Sample . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 4.2 The Fitting Strategies . . . . . . . . . . . . . . . . . . . . . . 49 4.2.1 B→K+K−K+K−K . . . . . . . . . . . . . . . . . . . 51 4.2.2 B→ϕϕK . . . . . . . . . . . . . . . . . . . . . . . . . 51 4.2.3 B→ϕK+K−K . . . . . . . . . . . . . . . . . . . . . . 53 4.3 The Fitting Results . . . . . . . . . . . . . . . . . . . . . . . . 54 5 The Related Charmonium Decays 61 5.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 5.2 Fitting Strategy . . . . . . . . . . . . . . . . . . . . . . . . . . 62 5.2.1 B±→ηc(J/ψ)K±→K+K−K+K−K± . . . . . . . . . 62 5.2.2 B±→ηc(J/ψ)K±→ϕK+K−K± . . . . . . . . . . . . 62 5.2.3 B±→ηcK±, ηc→ϕϕ . . . . . . . . . . . . . . . . . . 63 5.3 The Fitting Results . . . . . . . . . . . . . . . . . . . . . . . . 63 6 The Summary 67 6.1 The Systematic Error Study . . . . . . . . . . . . . . . . . . . 67 6.2 The BF of All Decays . . . . . . . . . . . . . . . . . . . . . . 69 6.3 Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 A The Ensemble Test 77 B The Significance including Systematic Uncertainties 83 C The Branching Fraction of the Control Sample 87 | |
| dc.language.iso | zh-TW | |
| dc.title | 測量B0介子衰變至φφK0之分支比與B介子衰變至末態為五個K介子之分析 | zh_TW |
| dc.title | Observation of B0→φφK0 and study of B meson decays to the five kaons final state | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 99-1 | |
| 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),陳凱風(Kai-Feng Chen) | |
| dc.subject.keyword | 衰變,分支比,貝爾偵測器, | zh_TW |
| dc.subject.keyword | decay,branching fraction,Belle detector, | en |
| dc.relation.page | 91 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2011-01-28 | |
| 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 | |
文件中的檔案：
| 檔案 | 大小 | 格式 | |
|---|---|---|---|
| ntu-100-1.pdf 目前未授權公開取用 | 15.16 MB | Adobe PDF |
系統中的文件，除了特別指名其著作權條款之外，均受到著作權保護，並且保留所有的權利。