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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/72270完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 張寶棣 | |
| dc.contributor.author | Yu-Chieh Ku | en |
| dc.contributor.author | 辜禹傑 | zh_TW |
| dc.date.accessioned | 2021-06-17T06:32:27Z | - |
| dc.date.available | 2018-08-21 | |
| dc.date.copyright | 2018-08-21 | |
| dc.date.issued | 2018 | |
| dc.date.submitted | 2018-08-16 | |
| dc.identifier.citation | [1] ”CKM group wiki page ”. URL:http://belle.kek.jp/secured/wiki/doku.php?id=physics:ckm:htag.
[2] ”Elementary Particle Interaction(Wikipedia)”. URL:https://en.wikipedia.org/wiki/Standard_Model#/media/File:Elementary_particle_interactions_in_the_Standard_Model.png. [3] J. Conradet al. ”Including systematic uncertainties in confidence interval construction for Poisson statistics”. PHYSICAL REVIEW D, 67, 2003. [4] A. Badin and A. A. Petrov. ”Searching for light Dark Matter in heavy meson decays”. Phys. Rev. D, 82, 2010. [5] G. Buchalla and A. J. Buras. ”QCD corrections to rare K- and B-decays for arbitrary top quark mass”. Nuclear Physics B, 400(1-3):225–239,1993. [6] Da-Xin Zhang Cai-Dian Lü. ”B S (B d ) → ν ν̄γ”. PHYSICS LETTERS B, pages 348–352, 1996. [7] Athanasios Dedes and Herbi Dreiner. ”Attempts at explaining the NuTeV observation of dimuon events”. Phys.Rev. D65, 2001. [8] A. Abashian et al. ”The Belle detector”. Nucl. Instruments Methods Phys. Res. Sect, A Accel. spectrometers,Detect.Assoc.Equip., 479.1:117–232, 2002. [9] J.P. Lees et al. ”Improved Limits on B 0 Decays to Invisible Final States and to ν ν̄γ”. Phys.Rev. D86, 2012. [10] Michael Feindt et al. “A hierarchical NeuroBayes-based algorithm for full reconstruction of B mesons at B factories”. Nucl. Instruments Methods Phys. Res.Sect. A Accel. Spectrometers, Detect. Assoc. Equip.,654.1:432–440, 2011. [11] S. Kurokawa et al. ”Overview of the KEKB accelerators”. Nucl. Instruments Methods Phys. Res. Sect, A Accel. spectrometers,Detect. Assoc.Equip., 499.1:1–7, 2003. [12] L. Hinz. ”Lepton ID efficiency correction and systematic error”. Bellenote 954, 2006. [13] Chia-Ling Hsu. ”Study of B → invisiblef inalstate”. Bellenote 1159,2012. [14] Vladimir Kulikovskiy. ”Adding a systematic uncertainty to the signal estimation in the on/off-zone measurements”. arXiv:1303.5195 [stat.AP],2013. [15] S. Neubauer. “ new full reconstruction tool using NeuroBayes”. Bellenote 1167, 2012. [16] S. Nishida. ”Study of kaon and pion identification using inclusive D*sample”. Bellenote 779, 2005. [17] Giovanni Punzi. ”sensitivity of searches for new signals and its optimization”. Conf. Stat. Probl. Part. Physics, Astrophys. Cosmol, page 5,2003. [18] A. Sibidanov and K. Varvel. ”Exclusive B → πlν B → ρlν and B → ωlν Decays using New Full Reconstruction Tagging”. Bellenote 1206, 2012. | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/72270 | - |
| dc.description.abstract | 本篇論文使用了強子標籤法在 Belle 實驗中尋找 B 0 → (γ)νν̅ 之稀有衰變,並借此探討標準模型外的新物理之可能性。本篇論文的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正負電子對狀器中所蒐集,來自 Υ(4S) 衰變的 771 百萬 B0 B0bar介子對。本篇論文使用了強子標籤法完整重組對狀事件中的一顆 B 介子,並藉著要求剩餘事件中沒有帶電粒子、中性 π 介子 及中性 K 介子,以描述B 0 → (γ)νν̅ 之訊號,本篇論文最終呈現 90%信心水準之下由蒙地卡羅模擬所求得的衰變分支上限值。 | zh_TW |
| dc.description.abstract | We perform a study to search for the decays B 0 → ν ν̄ and B 0 → ν ν̄γ using a sample of 771 million B- B̄ pairs collected with the Belle detector on the Υ(4S) resonance at KEK e + e − collider. The two resonance signature is identified by fully reconstructing the accompanying B meson that decays hadronically and requiring no charged particles, neutral pions and neutral kaons in the signal side. The branching fraction upper limits at 90% confidence level is presented. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-17T06:32:27Z (GMT). No. of bitstreams: 1 ntu-107-R05222024-1.pdf: 6447467 bytes, checksum: 6d1805dd78a63e8bc0b20a40ed7c1efb (MD5) Previous issue date: 2018 | en |
| dc.description.tableofcontents | Abstract iii
1 Introduction 1 1.1 The Standard Model.............................1 1.2 Motivation.....................................2 2 The Belle Experiment 5 2.1 KEKB Accelerator...............................5 2.2 Belle Detector.................................5 2.2.1 Beam Pipe....................................7 2.2.2 Extreme Forward Calorimeter(EFC).............9 2.2.3 Silicon Vertex Detector(SVD)................10 2.2.4 Central Drift Chamber(CDC)..................11 2.2.5 Aerogel Cherenkov counter system(ACC).......13 2.2.6 Time of Flight(TOF).........................14 2.2.7 Electromagnetic Calorimeter(ECL)............16 2.2.8 K L and Muon Detector(KLM)..................17 3 Data Sample 21 3.1 Samples.......................................21 3.2 B 0 → γν ν̄ Model..............................22 4 Selections 24 4.1 Hadronic Tagging and Tag Side Selections......24 4.2 E ECL ........................................24 4.3 cosθ T........................................24 4.4 Photon .......................................25 4.5 Track veto ...................................26 4.6 π 0 veto .....................................27 4.7 K L veto .....................................28 5 Neural Network 30 5.1 Tag side Neural Network ......................30 5.2 Shape variables Neural Network ...............30 5.3 Training Results .............................31 5.4 Two dimensional optimization on FOM ..........34 6 Fitter Construction(B 0 → ν ν̄) 37 6.1 Components ...................................37 6.2 Increase statistics ..........................38 6.3 Off Resonance data ...........................39 6.4 Fitting function .............................42 6.5 Pull test ....................................43 7 Control Sample 50 7.1 Modes and approach............................50 7.2 Particles Identification .....................50 7.3 Event Selections .............................51 7.4 E ECL shape in signal MC .....................52 7.5 Correction factor and systematic error........53 7.6 Control Sample Validity ......................55 8 Upper Limit Estimation 64 8.1 Systematic Uncertainty on Signal Efficiency...64 8.1.1 Full Recon correction on Efficiency.........64 8.1.2 Summary.....................................67 8.2 Counting Method...............................67 8.2.1 Expected Background in box..................68 8.2.2 Upper Limit Estimation......................70 8.3 Fitting Method................................71 8.3.1 Uncertainty of pdf modeling.................73 8.3.2 Upper limit estimation......................74 9 Conclusion 77 10 Appendix 78 10.1 Training variables distribution comparison in each bin ..................................................78 | |
| dc.language.iso | en | |
| dc.title | 使用強子標籤法在 Belle 實驗中尋找 B 介子衰變至(γ)νν̅ 之分析 | zh_TW |
| dc.title | Search for B 0 → (γ)νν̅ at Belle | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 106-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 王名儒,徐靜戈,張敏娟,王正祥 | |
| dc.subject.keyword | B介子,稀有B衰變,Belle 實驗, | zh_TW |
| dc.subject.keyword | B meson,rare B decay,Belle experiment, | en |
| dc.relation.page | 81 | |
| dc.identifier.doi | 10.6342/NTU201803480 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2018-08-16 | |
| 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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