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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 熊怡 | |
| dc.contributor.author | Cheng-Chin Chiang | en |
| dc.contributor.author | 江政錦 | zh_TW |
| dc.date.accessioned | 2021-06-15T02:21:56Z | - |
| dc.date.available | 2009-08-20 | |
| dc.date.copyright | 2009-08-20 | |
| dc.date.issued | 2009 | |
| dc.date.submitted | 2009-08-19 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/43455 | - |
| dc.description.abstract | 在本論文中我們測量了 B 介子衰變至兩個向量介子（VV）的機率，包括 B0 → ρ0 ρ0，B0 → K*0 anti-K*0 以及 B0 → K*0 K*0。此次實驗的測量結果是根據由 Belle 偵測器所收集到約六億五千七百萬個 B 與 反 B 介子事件而得到。我們也另外測量了所有可能 B 介子衰變至 π+π-π+π-，K+π-K-π+ 以及 K+π-K+π- 最終態的機率。測量結果顯示這些衰變模式的機率分別為：B0 → ρ0 ρ0 的衰變機率小於 1.0 × 10-6；B0 → K*0 anti-K*0 的衰變機率小於 0.8 × 10-6；B0 → K*0 K*0 的衰變機率小於 0.2 × 10-6。根據 B0 → ρ0 ρ0 衰變機率的測量結果，我們進一步縮小了電荷宇稱破壞裡其中一個係數（φ2）的範圍到 91.7±14.9 度。此外，我們也發現 B 介子衰變有可能衰變到 ρ0π+π-，非共振態 π+π-π+π- 以及非共振態 K+π-π+π，因此我們也分別給出了這些 B 介子衰變模式的機率以及其上限。 | zh_TW |
| dc.description.provenance | Made available in DSpace on 2021-06-15T02:21:56Z (GMT). No. of bitstreams: 1 ntu-98-D93222026-1.pdf: 26733462 bytes, checksum: cb4cb3be0caef538ad8f4973709caf6a (MD5) Previous issue date: 2009 | en |
| dc.description.tableofcontents | 1 Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
2 C P Violation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19 2.1 The Standard Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 2.2 The Kobayashi-Maskawa Mechanism . . . . . . . . . . . . . . . . . . . . . 21 2.3 Quantum Mechancis of B Decays . . . . . . . . . . . . . . . . . . . . . . . 24 2.4 Three Catagories of C P Violation . . . . . . . . . . . . . . . . . . . . . . . 27 2.5 Upsilon(4S) -> BB Decay . . . . . . . . . . . . . . . . . . . . . . . . . . 29 2.6 B0-B0 Mixing and B decays to CP Eigenstates . . . . . . . . . . . . . . . . . . . 30 3 The B ->VV Decays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37 3.1 General Formalism of Angular Analysis . . . . . . . . . . . . . . . . . . . . 37 3.2 Helicity Bases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 3.3 Transverse Bases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 3.4 B0 ->rho0 rho0 Decay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 3.5 B0 ->K*0 anti-K*0 and B0 -> K*0 K*0 Decays . . . . . . . . . . . . . . . . 46 4 The KEKB Accelerator and Belle Detector . . . . . . . . . . . . . . . . . . . .48 4.1 The KEKB Accelerator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 4.2 The Beam Pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 4.3 Silicon Vertex Detector (SVD) . . . . . . . . . . . . . . . . . . . . . . . . . 51 4.4 Extreme Forward Calorimeter (EFC) . . . . . . . . . . . . . . . . . . . . . 55 4.5 Central Drift Chamber (CDC) . . . . . . . . . . . . . . . . . . . . . . . . . 55 4.6 Aerogel ̆Cerenkov Counter (ACC) . . . . . . . . . . . . . . . . . . . . . . . 59 4.7 Time of Flight (TOF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 4.8 Electromagnetic Calorimeter (ECL) . . . . . . . . . . . . . . . . . . . . . . 62 4.9 KL and Muon Detector (KLM) . . . . . . . . . . . . . . . . . . . . . . . . 64 5 The Preliminary of Data Analysis . . . . . . . . . . . . . . . . . . . . . . . . . .66 5.1 Particle Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 5.1.1 Kaon/Pion Identification . . . . . . . . . . . . . . . . . . . . . . . . 66 5.1.2 Electron Identification . . . . . . . . . . . . . . . . . . . . . . . . . 68 5.1.3 Muon Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 5.2 Flavor Tagging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 5.2.1 Flavor Tagging Algorithm . . . . . . . . . . . . . . . . . . . . . . . 73 5.2.2 Track-level Flavor Tagging . . . . . . . . . . . . . . . . . . . . . . . 76 5.2.3 Event-level Flavor Tagging . . . . . . . . . . . . . . . . . . . . . . . 77 5.3 Kinematic Fit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78 5.4 Particle Selection and Cuts . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 6 Event Reconstruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .81 6.1 Mbc and Delta E Variables. . . . . . . . . . . . . . . . . . . . . . . . . .81 6.2 M (pi+pi-) vs. M(pi+pi-) Dalitz plot . . . . . . . . . . . . . . . . . . . 81 6.3 M (K+pi-) vs. M (K-pi+) Dalitz plot . . . . . . . . . . . . . . . . . . . 84 6.4 b -> c Veto . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84 6.5 Pcm(3pi) and M(3pi) Cuts . . . . . . . . . . . . . . . . . . . . . . . . . . 84 7 Monte Carlo Simulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .86 7.1 Signal B Decays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86 7.2 b -> u, d, s Background (Rare B Decays) . . . . . . . . . . . . . . . . . . . 86 7.3 b -> c Background (Generic B Decays) . . . . . . . . . . . . . . . . . . . . 86 7.4 e+e- -> qq (q=u,d,s and c) (Continuum Background) . . . . . . . . . 91 8 Continuum Background Suppression . . . . . . . . . . . . . . . . . . . . . . . . . .93 8.1 Event Shape Variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93 8.1.1 Thrust Angle . . . . . . . . . . . . . . . . . . . . . . . . . 93 8.1.2 Sphericity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94 8.1.3 B Flight Direction . . . . . . . . . . . . . . . . . . . . . . . 95 8.1.4 Super Fox-Wolfram Momenta . . . . . . . . . . . . . . . . . . . . . 95 8.2 Fisher Discriminant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97 8.3 Combined Event Shape Variables . . . . . . . . . . . . . . . . . . . . . . . 98 8.4 Likelihood Ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101 8.5 Figure of Merit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101 9 Signal Extraction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .106 9.1 4-D ML Fit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106 9.2 4-D ML Fit Bias Correction . . . . . . . . . . . . . . . . . . . . . . . . . . 109 9.3 2-D ML Fit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111 9.4 Mbc and Delta E PDFs Calibration . . . . . . . . . . . . . . . . . . . . 113 9.5 Decay Branching Fraction . . . . . . . . . . . . . . . . . . . . . . . . . . . 115 10 Pro jections of Data Fits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .119 10.1 B0 -> rho0 rho0 Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119 10.2 B0 -> K*0 anti-K*0 Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124 10.3 B0 -> K*0 K*0 Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131 11 Cross Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .134 11.1 The Branching Fractions of Control Samples . . . . . . . . . . . . . . . . . 134 11.2 The Branching Fraction of B0 -> phi K*0 . . . . . . . . . . . . . . . . . . . . 137 11.3 Signal Yields in B0 -> K*0 K*0 Signal Region . . . . . . . . . . . . . . . . . 138 12 Systematic Study . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .141 12.1 B0 -> rho0 rho0 Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141 12.2 B0 -> K*0 anti-K*0 Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143 12.3 B0 -> K*0 K*0 Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145 13 Conclusions and Discussions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .147 13.1 Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147 13.2 Constraints on CKM Phase 13.3 Discussions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156 A 4-D ML Fit PDFs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .157 A.1 B0 -> K*0 anti-K*0 Analysis . . . . . . . . . . . . . . . . . . . . . . . . 157 B 4-D ML Fit Bias Corrections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .163 B.1 B0 -> rho0 rho0 Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163 B.2 B0 -> K*0 anti-K*0/K*0 K*0 Analysis . . . . . . . . . . . . . .. . . . . . . . 166 B.3 PULL Distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174 Bibliography . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .178 | |
| dc.language.iso | en | |
| dc.subject | 電荷宇稱破壞 | zh_TW |
| dc.subject | 高能物理 | zh_TW |
| dc.subject | B介子物理 | zh_TW |
| dc.subject | CP Violation | en |
| dc.subject | B Physics | en |
| dc.subject | High Energy Physics | en |
| dc.title | B介子衰變至兩個向量介子的分析 | zh_TW |
| dc.title | Search for Rare B→VV Decays, Including B→ρ0 ρ0, B→K*0 anti-K*0, and B→K*0 K*0 | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 97-2 | |
| dc.description.degree | 博士 | |
| dc.contributor.coadvisor | 張寶棣 | |
| dc.contributor.oralexamcommittee | 王正祥,侯維恕,王名儒,張敏娟 | |
| dc.subject.keyword | 高能物理,電荷宇稱破壞,B介子物理, | zh_TW |
| dc.subject.keyword | High Energy Physics,CP Violation,B Physics, | en |
| dc.relation.page | 181 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2009-08-19 | |
| 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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