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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 張寶棣 | |
| dc.contributor.author | Chia-Hao Tu | en |
| dc.contributor.author | 涂嘉豪 | zh_TW |
| dc.date.accessioned | 2021-06-15T11:14:00Z | - |
| dc.date.available | 2016-08-25 | |
| dc.date.copyright | 2016-08-25 | |
| dc.date.issued | 2016 | |
| dc.date.submitted | 2016-08-21 | |
| dc.identifier.citation | [1] Wikipedia, http://en.wikipedia.org/wiki/File:Standard_Model_of_
Elementary_Particles.svg [2] Wikipedia, http://en.wikipedia.org/wiki/File:Elementary_particle_ interactions.svg [3] “CP violation”, https://en.wikipedia.org/wiki/CP_violation [4] J. H. Christenson, J. W. Cronin, V. L. Fitch, and R. Turlay, “Evidence for the 2 Decay of the K02 Meson”, Phys. Rev. Lett. 13, 138–140 (1964). [5] A. D. Sakharov, “Violation of CP Invariance, c Asymmetry, and Baryon Asymmetry of the Universe”, Pisma Zh. Eksp. Teor. Fiz. 5, 32–35 (1967). [6] Ashton B. Carter and A. I. Sanda, “CP Nonconservation in Cascade Decays of B Mesons”, Phys. Rev. Lett. 45, 952–954 (1980). [7] K. Abe et al. (Belle Collaboration), “Observation of Large CP Violation in the Neutral B Meson System”, Phys. Rev. Lett. 87, 091802 (2001). [8] S. W. Herb et al., “Observation of a Dimuon Resonance at 9.5 GeV in 400-GeV Proton-Nucleus Collisions”, Phys. Rev. Lett. 39, 252–255 (1977). [9] T. E. Browder and K. Honscheid, B mesons, Prog. Part. Nucl. Phys. 35, 0, 81 219 (1995). [10] “The Upsilon System”, http://www.lns.cornell.edu/public/lab-info/upsilon.html [11] J. Beringer et al. (Particle Data Group), “Review of Particle Physics”, Phys. Rev. D86, 010001 (2012). [12] Michael Feindt et al., “A Hierarchical NeuroBayes-based Algorithm for Full Reconstruction of B Mesons at B Factories”, Nucl. Instrum. Methods Phys. Res. Sect. A654, 432-440 (2011). [13] C. et al. Bobeth, “Bs,d ! ℓ+ℓ− in the Standard Model with Reduced Theoretical Uncertainty”, Phys. Rev. Lett. 112, 101801 (2014). [14] B. Aubert et al., “A Search for the rare decay B0 ! + − at BABAR”, Phys.Rev.Lett.96:241802 (2006). [15] A. Abashian et al. (Belle Collaboration), “The Belle detector”, Nucl. Instrum. Methods Phys. Res. Sect. A 479, 1, 117–232 (2002). [16] Z. Natkaniec et al. (Belle SVD2 Group), “Belle SVD2 Vertex Detector”, Nucl. Instrum. Methods Phys. Res. Sect. A 568, 1, 269-273 (2006). [17] K. miyabayashi, “Belle Electromagnetic Caloriment”, Nucl. Instrum. Methods Phys. Res. Sect. A 494, 1V3, 298-302 (2002). [18] “BASF Overview” (Belle internal), http://belle.kek.jp/secured/wiki/doku.php?id=software:basf [19] Chun-Hung Chen, “Study of inclusive lambda decay with hadronic tag at belle”, NTU master thesis (2016). [20] H.Kakuno, “Measurement of B(B− > Xul ) and |Vub| through Mx reconstruction with Simulated Annealing technique” (Belle internal), Belle Note 615 (2003). [21] Geoffrey C. Fox and Stephen Wolfram, “Observables for the Analyzis of Evnet Shapes in e+e− Annihilation and Other Processes”, Phys. Rev. Lett. 41, 1581-1585 (1978). [22] S. Kumar, “KLM response to Klong ± and K±”, Belle Note 351 (2010). BIBLIOGRAPHY 61 [23] “NeuroBayes”, https://twiki.cern.ch/twiki/bin/view/Main/NeuroBayes [24] Giovanni Punzi, “Sensitivity of searches for new signals and its optimization”, PHYSTAT2003,SLAC Sep. 8-11 (2003). [25] C. Jacoby L. Hinz and J. Wicht, “Lepton Efficiency and Systematic Error for Experiments 21 to 27” (Belle internal), Belle Note 777 (2004). [26] L. Hinz, Lepton ID Efficiency Correction and Systematic Error (Belle internal), Belle Note 954 (2006). [27] CMikihiko Nakao, Study of Kaon and Pion Identification Using Inclusive D Sample (Belle internal), Belle Note 779 (2005). [28] A. Sibidanov and K. Varvell, “Exclusive B ! Xulμ Decays Using New Full Reconstruction Tagging” (Belle internal), Belle Note 1206 (2011). [29] “Number of B Events in HadronB(J) (Belle internal)”, http://belle.kek.jp/secured/nbb/nbb.html [30] B. Bhuyan, “High PT tracking efficiency using partially reconstructed D decays” (Belle internal), Belle Note 1165 (2010). | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/49026 | - |
| dc.description.abstract | 我們在日本筑波KEKB電子-正子對撞機中，使用Belle偵測器中量測的771.581百萬BB介子進行數據分析。我們量測B0 介子衰變至濤子對的事例，而且我們考慮三種濤的衰變模式(τ->e,μ,π)，兩個濤粒子總共六種末態粒子的事例，因為末態粒子有2~4個微中子，所以我們使用強子標籤法來重建事例。為了進一步分辨訊號和背景，我們使用類神經網路演算法來提升訊躁比。我們得到的結果並沒有達到3個標準差之顯著度,在90\%的信心水準下得到的衰變機率上限是1.56 × 10E-3。與之前的量測結果相較，此次量測結果對於量測B介子衰變至τ+τ−有所提升，並提供了於Belle II實驗進行分析的方法。 | zh_TW |
| dc.description.abstract | We perform a search for B0->τ+τ−, based on a data sample of 772 million BB pairs collected at the (4S) resonance with the Belle detector at the KEKB asymmetric-energy e−e+ collider. We consider three τ decay modes ( τ->e,μ,π), which corresponds to six sub-decay final states of B. Since there are 2~4 neutrinos in the final state for signals, we employ the hadronic tagging method to fully reconstruct the accompanying B mesons. The signal and background separation is achieved using the NeuroBaye package with various kinematic variables. No significant signal is found, and we estimate the upper limit of branching fraction at 90% confidence level: B(B0->τ+τ−) < 1.56 × 10E−3. So far the obtained upper limit is the most stringent. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-15T11:14:00Z (GMT). No. of bitstreams: 1 ntu-105-R02222070-1.pdf: 16315575 bytes, checksum: 080cd5de07e8828e6b39e449383d93c1 (MD5) Previous issue date: 2016 | en |
| dc.description.tableofcontents | 1 Introduction 1
1.1 StandardModel............................... 1 1.1.1 CMKMatrix ............................ 2 1.1.2 CPViolatioin ........................... 3 1.2 BPhysics.................................. 4 1.3 FullReconstruction............................. 5 1.4 Motivation.................................. 7 2 The Belle Experiment 9 2.1 TheKEKBAccelerator........................... 10 2.2 BelleDetector................................ 11 2.2.1 BeamPipe ............................. 13 2.2.2 SiliconVertexDetector(SVD)................... 13 2.2.3 ExtremeForwardCalorimeter(EFC) . . . . . . . . . . . . . . . 17 2.2.4 CentralDriftChamber(CDC) ................... 19 2.2.5 AerogelČherenkovCounter(ACC) ................ 21 2.2.6 TimeofFlight(TOF)........................ 22 2.2.7 ElectromagneticCalorimeter(ECL) ................ 24 2.2.8 KLandMuondetectionsystem(KLM) .............. 26 2.3 BelleAnalysisFramework ......................... 26 3Signal Reconstruct and Event Selection 29 3.1 DataSample................................. 29 3.1.1 BlindAnalysis ........................... 29 3.2 ParticleIdentification............................ 29 3.2.1 ExcludeDaughtersfromneutralparticle . . . . . . . . . . . . . . 30 3.2.2 Duplicatedtracksremoval ..................... 30 3.2.3 ChargedParticleidentification................... 31 3.3 EvectSelection ............................... 32 3.3.1 Signalcandidate .......................... 32 3.3.2 TagSideSelection ......................... 33 3.3.3 SignalSideSelection........................ 35 3.3.4 RareBDecaysBackground .................... 39 3.3.5 Efficiencyselectionflow...................... 39 3.4 NeurobayeAlgorithm............................ 40 3.4.1 Neurobaye ............................. 40 3.4.2 Optimization ............................ 41 4Signal Extraction and Fitting 45 4.1 FittingStrategy ............................... 45 4.2 ProbabilityDistributionFunctionsModeling. . . . . . . . . . . . . . . . 46 4.2.1 Comparisons between MC and Data in sideband region . . . . . . 46 4.2.2 CorrectionofPDFofEECL .................... 47 4.3 MeasurementsofBranchingFraction.................... 48 4.4 EnsembleTest................................ 49 4.5 Control Sample Study (B0 → D∗−(D ̄0(K+π−)π−)l+ν) . . . . . . . . . 51 5 Result 55 5.1 Fitresult................................... 55 5.2 SystematicUncertainties .......................... 56 5.3 UpperLimitEstimation........................... 57 5.4 Conclusion ................................. 58 Bibliography 59 | |
| dc.language.iso | en | |
| dc.subject | τ輕子 | zh_TW |
| dc.subject | 高能實驗 | zh_TW |
| dc.subject | B介子 | zh_TW |
| dc.subject | τ | en |
| dc.subject | high energy | en |
| dc.subject | B meson | en |
| dc.title | B 介子衰變至 τ+τ− 之分析 | zh_TW |
| dc.title | Search for B0 → τ+τ− at Belle | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 104-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 王名儒,徐靜戈,王正祥 | |
| dc.subject.keyword | 高能實驗,B介子,τ輕子, | zh_TW |
| dc.subject.keyword | high energy,B meson,τ, | en |
| dc.relation.page | 61 | |
| dc.identifier.doi | 10.6342/NTU201601987 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2016-08-21 | |
| 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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