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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 | Bo-Yuan Yang | en |
dc.contributor.author | 楊博淵 | zh_TW |
dc.date.accessioned | 2021-06-17T02:16:27Z | - |
dc.date.available | 2018-01-04 | |
dc.date.copyright | 2018-01-04 | |
dc.date.issued | 2017 | |
dc.date.submitted | 2017-09-29 | |
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/68278 | - |
dc.description.abstract | 本篇論文使用了強子標籤法在 Belle 實驗中尋找 B → K(∗)νν ̄ 之衰 變。K(∗) 指的是 K+, K∗+, K∗0 和 Ks。本篇論文的宗旨是基於“Search for B → h(∗)νν ̄” [1] 之研究上,針對其訊號效率值做一些更深入的最 佳化。與前述研究 [1] 不同的是,本篇論文在 Sb 分佈中分割七到九個 區間,並在每個區間上採取獨立研究。實驗數據是由日本高能加速器 研究機構 B 介子工廠 (KEKB) 之 Belle 偵測器在能量不對稱之電子正 子對撞器中所收集,來自 Υ(4S) 共振態衰變的 772 百萬 BB 介子對。 量測結果中沒有發現顯著性的訊號,本篇論文計算了在每個 Sb 區間中 的衰變區間分支比。本篇論文也計算了 Sb 小於 0.3 的衰變分支比和在 90% 的信心水準下的分支比上限值。在 Sb 小於 0.3 的 90% 信心水準之 分支比上限值計算中,本篇論文得到了B(B+ →K+νν ̄)<1.09×10−5, B(B+ → K∗+νν ̄) < 3.16 × 10−5, B (B → K∗0νν ̄) < 1.80 × 10−5 和 B(B0 → Ksνν ̄) < 0.81 × 10−5。此計算結果顯示本論文所得到的分支 比上限值為目前世界上最低最好的。 | zh_TW |
dc.description.abstract | This thesis reports the study of the B decay channels B → K(∗)νν ̄ with hadronic tag, the K(∗) refer to K+, K∗+, K∗0 and Ks. This study optimized the signal efficiency comparing with previous study“Search for B → h(∗)νν ̄” [1], with the full Belle Υ (4S) data sample and perform the bin-by-bin study on full Sb spectrum. The complete data sample of 772 million BB ̄ pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric energy electron-positron collider are analyzed in this study. As there is no significant signal yield, this thesis obtain the center value partial branching ratio for each bin and also set the 90 % C.L. upper limit. For SB < 0.3 region of B(B+ → K+νν ̄) < 1.09 × 10−5, B(B+ → K∗+νν ̄) < 3.16 × 10−5, B (B → K∗0νν ̄) < 1.80 × 10−5 and B(B0 → Ksνν ̄) < 0.81 × 10−5. This thesis set the world best upper limit for B → K(∗)νν ̄. | en |
dc.description.provenance | Made available in DSpace on 2021-06-17T02:16:27Z (GMT). No. of bitstreams: 1 ntu-106-R03245010-1.pdf: 13178579 bytes, checksum: 347ce639999bbc0ab61acd358176af59 (MD5) Previous issue date: 2017 | en |
dc.description.tableofcontents | Abstract v
1 Introduction 1 1.1 StandardModel............................... 1 1.1.1 QuarksandLeptons ........................ 2 1.1.2 The Higgs Boson.......................... 3 1.2 TheCabbibo-Kobayashi-MaskawaMatrix................. 3 1.3 B Physics.................................. 5 1.4 CPViolation................................. 7 1.5 Motivation.................................. 8 2 The Belle Experiment 13 2.1 KEKBAccelerator ............................. 13 2.2 BelleDetector................................ 16 2.2.1 BeamPipe ............................. 18 2.2.2 Silicon Vertex Detector(SVD)................... 21 2.2.3 ExtremeForwardCalorimeter(EFC) . . . . . . . . . . . . . . . 22 2.2.4 CentralDriftChamber(CDC) ................... 24 2.2.5 AerogelČherenkovCounter(ACC) ................ 26 2.2.6 TimeofFlight(TOF)........................ 28 2.2.7 electromagnetic calorimeter(ECL) ................ 30 2.2.8 KLandMuondetectionsystem(KLM) .............. 32 3 Event Selection and Reconstruction 35 3.1 DataSample................................. 35 3.1.1 BlindAnalysis ........................... 35 3.1.2 BackgroundMonteCarlosample ................. 36 3.1.3 SignalMonteCarlosample..................... 36 3.2 EventSelection ............................... 37 3.2.1 HadronicTag............................ 37 3.2.2 ParticleSelectionCriterion..................... 38 3.2.3 BasicSelection........................... 39 4 Model Independent Study 49 4.1 SbDistribution ............................... 49 4.2 Neural-Network training .......................... 49 4.2.1 KakunoSuperFox-Wolfram(KSFW) ............... 51 4.2.2 Training result ........................... 53 4.2.3 Optimization ............................ 53 5 Fitting and Counting strategy 63 5.1 Counting strategy.............................. 63 5.1.1 SignalBoxandSidebandDetermination. . . . . . . . . . . . . . 64 5.1.2 Background estimation....................... 65 5.2 FittingStrategy ............................... 68 5.2.1 Probability Distribution Functions Modeling . . . . . . . . . . . 69 5.2.2 EnsembleTest ........................... 70 5.3 MeasurementsofBranchingFraction.................... 76 6 Control Sample Study 79 6.1 EventSelection ............................... 79 6.2 Signal extraction .............................. 80 6.3 Measurement ................................ 84 6.3.1 BranchingFractionCalibration................... 84 7 Results 87 7.1 ExpectedCountingResults......................... 87 7.2 ExpectedFittingResults .......................... 88 7.3 SystematicUncertainties .......................... 90 7.3.1 NumberofBB ̄ ........................... 91 7.3.2 Trackinguncertainty ........................ 91 7.3.3 K/πPIDuncertainty ........................ 91 7.3.4 Tagefficiencyuncertainty ..................... 91 7.3.5 Ksandπ0reconstructionuncertainty ............... 92 7.3.6 Neurobayessystematicuncertainty. . . . . . . . . . . . . . . . . 92 7.4 SystematicUncertaintiesonBackgroundLevel . . . . . . . . . . . . . . 92 7.5 UpperLimitEstimationforBranchingFraction . . . . . . . . . . . . . . 95 7.6 PhysicsResult................................ 97 7.6.1 Counting Part............................ 97 7.6.2 FittingPart ............................. 99 7.7 Conclusion .................................102 A Neurobayes systematic uncertainty 103 B Blinded distribution and the Monte Carlo expectation 107 Bibliography 117 | |
dc.language.iso | en | |
dc.title | 使用強子標籤法在 Belle 實驗尋找 B 介子衰變至 K(∗)νν 之分析 | zh_TW |
dc.title | Search for B → K(∗)νν with Hadronic Tag at Belle Experiment | en |
dc.type | Thesis | |
dc.date.schoolyear | 106-1 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 王名儒(Min-Zu Wang),張敏娟(Ming-Chuan Chang),王正祥(Cheng-Hsiang Wang),徐靜戈(Jing-Ge Shiu) | |
dc.subject.keyword | 強子標籤法,電弱 B 衰變,B 介子,Belle 實驗,稀有 B 衰變, | zh_TW |
dc.subject.keyword | Hadronic tag,Electroweak B decay,B meson,Belle experiment,rare B decay, | en |
dc.relation.page | 123 | |
dc.identifier.doi | 10.6342/NTU201704242 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2017-09-29 | |
dc.contributor.author-college | 理學院 | zh_TW |
dc.contributor.author-dept | 應用物理研究所 | zh_TW |
顯示於系所單位: | 應用物理研究所 |
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