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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 王名儒(Minzu Wang) | |
| dc.contributor.author | Pei-Cheng Lu | en |
| dc.contributor.author | 盧沛成 | zh_TW |
| dc.date.accessioned | 2021-06-17T00:19:49Z | - |
| dc.date.available | 2020-03-03 | |
| dc.date.copyright | 2020-03-03 | |
| dc.date.issued | 2020 | |
| dc.date.submitted | 2020-02-12 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/66038 | - |
| dc.description.abstract | 日本筑波KEK之B工廠(包括了KEKB 加速器以及BELLE 偵測器) 於1998 至2010 年間收集了772 百萬BB 介子對實驗數據，藉著準確的粒子分辨率以及粒子的四動量，我們使用了這些BB 介子對，量測了B+衰變至pΛK+K− 以及B+ 衰變至pΛK+K+ 四體衰變分支比及中間態衰變分支比。藉由分析各中間態的量測，我們能夠更清楚了解此衰變的結構。在此量測中，我們發現了四個新衰變態: genuine fourbody decay of B(B+ → pΛK+K−) = (4.10+0.45−0.43± 0.50)×10−6、genuine fourbody decay of B(B+ → pΛK+K+) = (3.70+0.39−0.37±0.44)×10−6、B(B+ → pΛϕ) = (7.95±2.09±0.77) × 10−7 and B(ηc → p¯ΛK− +c.c.) = (2.83+0.36−0.34± 0.35) × 10−3 )。這裡B指的是粒子的衰變分支比。根據我們對Λ−c 的了解，Λ−c 為udc 態，Λ−c 與Λ 皆為IJP = 0(1/2+)，以上量測與B(B0 → p¯Λ−c π+π−) > B(B+ → p¯Λ−c π+)的衰變分支比結構類似。新的魅粒子態也同時被發現，可根據此實驗結果對於魅粒子態有更進一步的了解。 | zh_TW |
| dc.description.abstract | From 1998 to 2010, the B factory (including KEKB accelerator and BELLE detector)at KEK collected 772 million BB pairs. With the precise identification and measurement of four-momentum of particles, we finished the studies: genuine four-body decay of B(B+ → pΛK+K−) = (4.10+0.45−0.43± 0.50)×10−6、genuine four-body-decay of B(B+ → pΛK+K+) = (3.70+0.39−0.37± 0.44)×10−6、B(B+ →pΛϕ) = (7.95 ± 2.09 ± 0.77) × 10−7 and B(ηc → p¯ΛK− +c.c.) = (2.83+0.36−0.34±0.35) × 10−3. Here B is the branching fraction of the particles. According to our understanding of Λ−c , Λ−c is udc state, Λ−c and Λ are IJP = 0(1/2+). The hierarchical structure seems to exist, e.g., B(B0 → p¯Λ−c π+π−) > B(B+ → p¯Λ−c π+).
We also found a new charmonium decay mode, ηc → p¯ΛK− +c.c., which can be compared with the measured decay mode, J/ψ → p¯ΛK− +c.c., thus we could have a clearer understanding on charmonium system. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-17T00:19:49Z (GMT). No. of bitstreams: 1 ntu-109-D03222017-1.pdf: 7814013 bytes, checksum: ca353cf454c7c2c2f626dd3022d8109f (MD5) Previous issue date: 2020 | en |
| dc.description.tableofcontents | 1 Introduction 1
1.1 Motivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 Standard Model . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.2.1 Mesons and Baryons . . . . . . . . . . . . . . . . . . . . 3 1.2.2 B Physics . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1.2.3 The Cabibbo-Kobayashi-Maskawa Matrix . . . . . . . . . 7 1.2.4 CP violation . . . . . . . . . . . . . . . . . . . . . . . . 9 2 Belle Experiment 11 2.1 KEKB BFactory. . . . . . . . . . . . . . . . . . . . . . . . . . 11 2.2 BELLE Detector . . . . . . . . . . . . . . . . . . . . . . . . . . 13 2.2.1 Beamline Magnets near the IP and Beam Pipe . . . . . . 18 2.2.2 Extreme Forward Calorimeter (EFC) . . . . . . . . . . . 18 2.2.3 Silicon Vertex Detector (SVD) . . . . . . . . . . . . . . . 21 2.2.4 Central Drift Chamber (CDC) . . . . . . . . . . . . . . . 22 2.2.5 Aerogel Čerenkov Counter System (ACC) . . . . . . . . . 24 2.2.6 TimeofFlight Counters (TOF) . . . . . . . . . . . . . . 26 2.2.7 Electromagnetic Calorimeter (ECL) . . . . . . . . . . . . 29 2.2.8 Particle Identification of Electrons and Charged Kaons, EID and KID . . . . . . . . . . . . . . . . . . . . . . . . 31 2.2.9 KL and Muon Detection System (KLM) . . . . . . . . . . 32 3 Introduction 35 3.1 B Reconstruction and Event Selection . . . . . . . . . . . . . . . 35 3.2 Charged Track Selection . . . . . . . . . . . . . . . . . . . . . . 35 3.3 Λ Reconstruction . . . . . . . . . . . . . . . . . . . . . . . . . . 36 3.4 Best Candidate Selection . . . . . . . . . . . . . . . . . . . . . . 36 3.5 D0 and D∗0 veto . . . . . . . . . . . . . . . . . . . . . . . . . . 36 3.6 Signal Monte Carlo(MC) . . . . . . . . . . . . . . . . . . . . . . 36 3.7 Selections Summary . . . . . . . . . . . . . . . . . . . . . . . . 37 3.8 Possible Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 4 Background Study 39 4.1 Overview of Backgrounds Study . . . . . . . . . . . . . . . . . . 39 4.2 Continuum Suppression . . . . . . . . . . . . . . . . . . . . . . . 39 4.2.1 ΔZ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 4.2.2 cosθB . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 4.2.3 Kakuno Super FoxWolfram( KSFW) . . . . . . . . . . . 40 4.2.4 q × r . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 4.3 Best FOM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 4.4 BB Background . . . . . . . . . . . . . . . . . . . . . . . . . . 44 5 Study of Intermediate States 47 5.1 B+ → pΛK+K− . . . . . . . . . . . . . . . . . . . . . . . . . . 47 5.2 B+ → pΛK+K+ . . . . . . . . . . . . . . . . . . . . . . . . . . 48 5.3 Issue of Dibaryonic Threshold Enhancement . . . . . . . . . . . . 49 6 2D Fitting of Data 51 6.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 6.2 2D Fitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 6.3 Measurement of Inclusive Decay . . . . . . . . . . . . . . . . . . 56 6.4 Fourbody Decay . . . . . . . . . . . . . . . . . . . . . . . . . . 58 7 Fitting of Data for Resonance Modes 61 7.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 7.2 3D Fitter and 4D Fitter . . . . . . . . . . . . . . . . . . . . . . . 64 7.3 Results of Fitting . . . . . . . . . . . . . . . . . . . . . . . . . . 68 7.3.1 (B+ → J/ψK+) × (inclusive J/ψ → pΛK−) . . . . . . 71 7.3.2 (B+ → ηcK+) × (inclusive ηc → pΛK−) . . . . . . . . 71 7.3.3 (B+ → χc1K+) × (inclusive χc1 → pΛK−) . . . . . . . 73 7.3.4 (B+ → pΛϕ) × (ϕ → K+K−) . . . . . . . . . . . . . . 75 7.3.5 (B+ → Λ(1520)ΛK+) × (Λ(1520) → pK−) . . . . . . . 77 7.3.6 (B+ → ηcK+) × (ηc → Λ(1520)Λ) × (Λ(1520) → pK−) 79 7.3.7 (B+ → J/ψK+) × (J/ψ → Λ(1520)Λ) × (Λ(1520) → pK−) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 7.3.8 (B+ → Λ(1520)ΛK+) × (Λ(1520) → pK+) . . . . . . . 81 8 Conclusion 83 8.1 Summary of Measured Branching Fractions . . . . . . . . . . . . 83 8.2 Decay Process of Dibaryonic System . . . . . . . . . . . . . . . . 83 9 Systematic Error Study 85 9.1 Tracking Uncertainty . . . . . . . . . . . . . . . . . . . . . . . . 85 9.2 Number of B ¯B Pairs Uncertainty . . . . . . . . . . . . . . . . . . 85 9.3 Dibaryonic system(X””bb) Uncertainty in MC . . . . . . . . . . . 85 9.4 Proton Identification Uncertainty . . . . . . . . . . . . . . . . . . 87 9.5 Kaon Identification Uncertainty . . . . . . . . . . . . . . . . . . 87 9.6 Signal PDF(ΔE, Mbc and Mres) Uncertainty . . . . . . . . . . . . 87 9.7 MC Efficiency Uncertainty . . . . . . . . . . . . . . . . . . . . . 90 9.8 qq Suppression Uncertainty . . . . . . . . . . . . . . . . . . . . . 91 9.9 Λ Selection Uncertainty . . . . . . . . . . . . . . . . . . . . . . . 93 9.10 D0 and D∗0 veto Uncertainty . . . . . . . . . . . . . . . . . . . . 93 9.11 Summary of Systematic Errors . . . . . . . . . . . . . . . . . . . 94 A Signal MC Efficiencies with Each Cut 97 A.1 B+ → pΛK+K− . . . . . . . . . . . . . . . . . . . . . . . . . . 97 A.2 B+ → pΛK+K+ . . . . . . . . . . . . . . . . . . . . . . . . . . 102 B Plots of Variables for qq Suppression 107 B.1 B+ → pΛK+K− . . . . . . . . . . . . . . . . . . . . . . . . . . 107 B.2 B+ → pΛK+K+ . . . . . . . . . . . . . . . . . . . . . . . . . . 112 C Spectra of Invariant Mass 117 C.0.1 B+ → pΛK+K− . . . . . . . . . . . . . . . . . . . . . . 117 C.0.2 B+ → pΛK+K+ . . . . . . . . . . . . . . . . . . . . . . 123 C.0.3 Combined Data . . . . . . . . . . . . . . . . . . . . . . . 127 D Signal Monte Carlo-PHSP 129 E Signal Monte Carlo-Xbb 131 F Efficiency Corrections 133 F.1 Kaon ID Efficiency Correction(εkID) . . . . . . . . . . . . . . . . 133 F.2 Proton ID Efficiency Correction(εpID) . . . . . . . . . . . . . . . 136 G Models of Resonance Mass 139 H Plots of Xbb distribution 141 I Float Variables in Fitting for Resonance Modes 145 J 2D Trigger Maintenance at BELLE II 147 J.1 BELLE II Detector . . . . . . . . . . . . . . . . . . . . . . . . . 147 J.2 Level 1 Trigger System in BELLE II Experiment . . . . . . . . . 148 J.3 The connection between boards . . . . . . . . . . . . . . . . . . . 148 J.4 Early Check of 2D Data . . . . . . . . . . . . . . . . . . . . . . . 149 J.5 The Updating of 2D Firmware . . . . . . . . . . . . . . . . . . . 152 J.6 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152 | |
| dc.language.iso | en | |
| dc.subject | B介子衰變 | zh_TW |
| dc.subject | 魅子中間態 | zh_TW |
| dc.subject | 雙重子衰變 | zh_TW |
| dc.subject | Decay of B meson | en |
| dc.subject | Intermediate decay of charmonium | en |
| dc.subject | Dibaryonic decay | en |
| dc.title | B+ 介子衰變至p Λ-bar K+ K−以及p-bar Λ K+ K+ 之分析 | zh_TW |
| dc.title | B+ decaying to p Λ-bar K+ K− and p-bar Λ K+ K+ | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 108-1 | |
| dc.description.degree | 博士 | |
| dc.contributor.oralexamcommittee | 張寶棣(Pao-Ti Chang),王正祥(Chung-Hsiang Wang),徐靜戈(Jing-Ge Shui),張敏娟(Ming-Juan Chang) | |
| dc.subject.keyword | B介子衰變,雙重子衰變,魅子中間態, | zh_TW |
| dc.subject.keyword | Decay of B meson,Dibaryonic decay,Intermediate decay of charmonium, | en |
| dc.relation.page | 157 | |
| dc.identifier.doi | 10.6342/NTU202000406 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2020-02-13 | |
| dc.contributor.author-college | 理學院 | zh_TW |
| dc.contributor.author-dept | 物理學研究所 | zh_TW |
| 顯示於系所單位： | 物理學系 | |
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