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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 王名儒(Ming-Zu Wang) | |
| dc.contributor.author | Chun-Hung Chen | en |
| dc.contributor.author | 陳俊宏 | zh_TW |
| dc.date.accessioned | 2021-06-15T13:25:26Z | - |
| dc.date.available | 2016-06-11 | |
| dc.date.copyright | 2016-06-11 | |
| dc.date.issued | 2016 | |
| dc.date.submitted | 2016-05-10 | |
| dc.identifier.citation | [1] (Particle Data Group) http://pdg.lbl.gov/
[2] G. Crawford et al:, Physics Review D Vol. 45 Num. 3 (1995) [3] http://www2.kek.jp/accl/introKEKB/gaiyo.html [4] A. Abashian et al:(Belle Collaboration), Nuclear Instruments and Meth- ods in Physics Research A 479 117232 (2002) [5] http://robbep.web.cern.ch/robbep/EvtGen/GuideEvtGen.pdf [6] http://hep. .infn.it/geant.pdf [7] https://www.ifh.de/CHEP97/paper/244.ps [8] http://osksn2.hep.sci.osaka-u.ac.jp/ taku/doc/paw.pdf [9] https://root.cern.ch/download/doc/Users Guide 5 26.pdf [10] (Belle internal page) http://belle.kek.jp/secured/wiki/doku.php?id=software: x mdst [11] Y.-Y. Chang, M.-Z. Wang et al:, Phys. Rev. Lett. 115, 221803 (2015) [12] (Belle internal page) http://belle.kek.jp/secured/wiki/doku.php?id=software:bpsmear [13] (Belle internal page) http://belle.kek.jp/secured/wiki/doku.php?id=software:addbg [14] M. Feindt et al:, Nucl.Instrum.Meth.A654:432-440 (2011) [15] (Belle internal page) http://belle.kek.jp/secured/wiki/doku.php?id=software:fullreconstruction:n[16] K.-F. Chen, T.-L. Kuo, Y.-J. Lee (Belle internal), Belle note 684 (2004) [17] Alexei Sibidanov and Kevin Varvell (Belle internal), Belle note 1206 (2011) [18] Bipul Bhuyan (Belle internal), Belle note 1165 (2010) [19] Wolfgang Dungel (Belle internal) Belle note 1176 (2011) [20] Kai-Jen Tien (Belle internal), Belle note 1279 (2012) | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/51114 | - |
| dc.description.abstract | 本論文探討含 Λ 終態的帶電 B 介子衰變。利用來自日本高能加速
器研究機構 KEKB 之 Belle 偵測器在非對稱能量之電子正子對撞中 所產生的實驗數據分析，裡面含有 771 百萬來自 Υ(4S) 衰變的 B 介子對事件。分析方法採用以神經網路演算法為基礎的強子標籤法來 辨識其中一個 B 介子，再用剩餘的粒子重建 Λ/反Λ。 此實驗的結果以在對撞質心中 Λ/反Λ 的動量分佈呈現。 | zh_TW |
| dc.description.abstract | In this thesis, I report the study of inclusive charged B meson decay to Λ X, based on a data sample of about 772 million BBbar pairs collected with the Belle detector at KEKB asymmetric-energy e+e- collider at the Υ(4S) resonance. Events are selected by a fully reconstructed B meson using hadronic tagging method and then search for Λ baryons from the rest of the particles. The measured result is presented as inclusive momentum spectrum of Λ/anti-Λ particle in the e+e- center-of-mass frame. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-15T13:25:26Z (GMT). No. of bitstreams: 1 ntu-105-R01222022-1.pdf: 11340816 bytes, checksum: 43a7e6778232467c3c0d03f4e1cc50ad (MD5) Previous issue date: 2016 | en |
| dc.description.tableofcontents | 1 Introduction 1
1.1 Standard Model . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.1.1 Feynman Diagram . . . . . . . . . . . . . . . . . . . . 3 1.1.2 CKM Matrix . . . . . . . . . . . . . . . . . . . . . . . 3 1.1.3 Symmetry . . . . . . . . . . . . . . . . . . . . . . . . . 6 1.1.4 CP Violation . . . . . . . . . . . . . . . . . . . . . . . 7 1.2 B Meson Physics . . . . . . . . . . . . . . . . . . . . . . . . . 8 1.3 Motivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2 Belle Experiment 11 2.1 Introduction to the Belle Experiment . . . . . . . . . . . . . . 11 2.2 KEKB Accelerator . . . . . . . . . . . . . . . . . . . . . . . . 11 2.3 Belle Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 2.3.1 Beam Pipe . . . . . . . . . . . . . . . . . . . . . . . . . 14 2.3.2 Silicon Vertex Detector . . . . . . . . . . . . . . . . . . 16 2.3.3 Extreme Forward Calorimeter . . . . . . . . . . . . . . 17 2.3.4 Central Drift Chamber . . . . . . . . . . . . . . . . . . 19 2.3.5 Aerogel Cherenkov Counter . . . . . . . . . . . . . . . 21 2.3.6 Time of Flight . . . . . . . . . . . . . . . . . . . . . . . 22 2.3.7 Electromagnetic Calorimeter . . . . . . . . . . . . . . . 25 2.3.8 KL and Moun Detector . . . . . . . . . . . . . . . . . . 28 2.3.9 Solenoid and Iron Yoke . . . . . . . . . . . . . . . . . . 28 2.4 Particle Identication . . . . . . . . . . . . . . . . . . . . . . . 29 2.5 Trigger System . . . . . . . . . . . . . . . . . . . . . . . . . . 29 2.6 Data Acquisition System . . . . . . . . . . . . . . . . . . . . . 30 3 Analysis 33 3.1 Blind Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 3.2 Analysis Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 3.2.1 EvtGen . . . . . . . . . . . . . . . . . . . . . . . . . . 33 3.2.2 GSIM . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 3.2.3 BASF . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 3.2.4 PAW . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 3.2.5 ROOT & RooFit . . . . . . . . . . . . . . . . . . . . . 36 3.3 Data Sample . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 3.3.1 Fix mdst Module and Hadronic Skim . . . . . . . . . . 38 3.3.2 Monte Carlo Simulation . . . . . . . . . . . . . . . . . 38 3.4 Hadronic B Tagging Method . . . . . . . . . . . . . . . . . . . 39 3.5 Event Selection . . . . . . . . . . . . . . . . . . . . . . . . . . 43 3.5.1 Tag Side Selection . . . . . . . . . . . . . . . . . . . . 43 3.5.2 Signal Side Selection . . . . . . . . . . . . . . . . . . . 44 3.6 Figure of Merit . . . . . . . . . . . . . . . . . . . . . . . . . . 46 4 Measurement of xp Distribution 49 4.1 Limit of xp Set by Relativistic Kinematics . . . . . . . . . . . 49 4.2 Binning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 4.3 Signal Extraction . . . . . . . . . . . . . . . . . . . . . . . . . 50 4.3.1 Identication of Signal Btag . . . . . . . . . . . . . . . 51 4.3.2 Background Subtraction . . . . . . . . . . . . . . . . . 51 4.3.3 Contamination of Neutral B Meson . . . . . . . . . . . 54 4.4 Monte Carlo Eciency . . . . . . . . . . . . . . . . . . . . . . 58 4.5 Fit Results on Real Data . . . . . . . . . . . . . . . . . . . . . 60 4.5.1 Reconstruction Result . . . . . . . . . . . . . . . . . 60 4.5.2 Reconstruction Result . . . . . . . . . . . . . . . . . 63 4.6 Multiplicity Calculation . . . . . . . . . . . . . . . . . . . . . 65 4.7 Systematic Uncertainty . . . . . . . . . . . . . . . . . . . . . . 67 4.7.1 Number of B B Pairs . . . . . . . . . . . . . . . . . . . 67 4.7.2 Tag Calibration . . . . . . . . . . . . . . . . . . . . . . 68 4.7.3 Charged Track Finding . . . . . . . . . . . . . . . . . . 68 4.7.4 Charged Particle Identication . . . . . . . . . . . . . . 69 4.7.5 Selection . . . . . . . . . . . . . . . . . . . . . . . . 69 4.7.6 Subdecay Branching Fraction . . . . . . . . . . . . . 70 4.7.7 Signal PDF Shape . . . . . . . . . . . . . . . . . . . . 70 4.7.8 MC Statistics . . . . . . . . . . . . . . . . . . . . . . . 70 4.8 Measured xp Distribution . . . . . . . . . . . . . . . . . . . . . 70 5 Conclusion 75 A Number of B B Pairs in HadronB(J) Skim 77 B Fit Results for the Study of B0 Contamination 79 B.1 The First Sample . . . . . . . . . . . . . . . . . . . . . . . . . 80 B.1.1 Λ Reconstruction Result . . . . . . . . . . . . . . . . . 80 B.1.2 Λbar Reconstruction Result . . . . . . . . . . . . . . . . . 83 B.2 The Second Sample . . . . . . . . . . . . . . . . . . . . . . . . 85 B.2.1 Λ Reconstruction Result . . . . . . . . . . . . . . . . . 85 B.2.2 Λbar Reconstruction Result . . . . . . . . . . . . . . . . . 88 C Fit Results on Exclusive MC Samples 91 C.1 B+ →Λbarpπ+ π- Decay Mode . . . . . . . . . . . . . . . . . . . 91 C.1.1 Λ Reconstruction Result . . . . . . . . . . . . . . . . . 91 C.1.2 Λbar Reconstruction Result . . . . . . . . . . . . . . . . . 94 C.2 B+ →pΛbar π0 Decay Mode . . . . . . . . . . . . . . . . . . . . . 96 C.2.1 Λ Reconstruction Result . . . . . . . . . . . . . . . . . 96 C.2.2 Λbar Reconstruction Result . . . . . . . . . . . . . . . . . 98 C.3 B+ →J/ψ Λbar p Decay Mode . . . . . . . . . . . . . . . . . . . . 101 C.3.1 Λ Reconstruction Result . . . . . . . . . . . . . . . . . 101 C.3.2 Λbar Reconstruction Result . . . . . . . . . . . . . . . . . 102 C.4 B+ → pΛbar D0bar Decay Mode . . . . . . . . . . . . . . . . . . . . 103 C.4.1 Λ Reconstruction Result . . . . . . . . . . . . . . . . . 103 C.4.2 Λbar Reconstruction Result . . . . . . . . . . . . . . . . . 105 Bibliography 109 | |
| dc.language.iso | en | |
| dc.title | 用強子標籤法研究含 Λ 終態的B 介子衰變 | zh_TW |
| dc.title | Study of Inclusive Lambda Decay with Hadronic Tag at Belle | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 104-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 張寶棣(Pao-Ti Chang),張敏娟(Ming-Chuan Chang),徐靜戈(Jing-Ge Shiu) | |
| dc.subject.keyword | B介子,貝爾實驗,強子標籤法,Λ重子,包容性衰變, | zh_TW |
| dc.subject.keyword | B meson,Belle experiment,hadronic tag,inclusive decay,lambda, | en |
| dc.relation.page | 110 | |
| dc.identifier.doi | 10.6342/NTU201600244 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2016-05-10 | |
| 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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