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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 張寶棣(Paoti Chang) | |
| dc.contributor.author | Chia-Ling Hsu | en |
| dc.contributor.author | 徐嘉伶 | zh_TW |
| dc.date.accessioned | 2021-05-20T20:50:30Z | - |
| dc.date.available | 2012-08-16 | |
| dc.date.available | 2021-05-20T20:50:30Z | - |
| dc.date.copyright | 2011-08-16 | |
| dc.date.issued | 2011 | |
| dc.date.submitted | 2011-08-08 | |
| dc.identifier.citation | [1] Nakamura, K. et al. J. Phys. G37, 075021 (2010).
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/9936 | - |
| dc.description.abstract | 在本論文中我們尋找B介子至不可見末態衰變。此次實驗的測量結果是根據由Belle 偵測器所收集到約六億五千七百萬個B與反B介子事件而得到。由沒有明顯信號，我們給予90%信心水準的衰變機率(B)上限：B(B→invisible)<1.3×10-4 | zh_TW |
| dc.description.abstract | We report a new search for B decays into invisible final states using a data sample of 657 million BB pairs collected at Y(4S) resonance with the Belle detector at the KEKB e+e- collider. The nu nu signals are identified by fully reconstructing the accompanying $B$ mesons and requiring no other charged particles and no extra energy deposited in the calorimeter. By performing maximum likelihood fits to the reconstructed candidates, no significant signal is observed and we set the upper limit on the branching fraction B(B→invisible)<1.3×10-4 at the 90% confidence level. | en |
| dc.description.provenance | Made available in DSpace on 2021-05-20T20:50:30Z (GMT). No. of bitstreams: 1 ntu-100-R96222016-1.pdf: 14566717 bytes, checksum: 93384823e4afc536eefbe8b5c4df51df (MD5) Previous issue date: 2011 | en |
| dc.description.tableofcontents | 1 Introduction 1
1.1 Particle Physics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 The Standard Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.2.1 CP Violation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.2.2 CKM Matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.3 Υ(4S) and B meson . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.4 Motivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2 B Factary at KEK 10 2.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.2 KEKB accelerator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.3 The Beam Pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 2.4 Silicon Vertex Detector (SVD) . . . . . . . . . . . . . . . . . . . . . . . . . 15 2.5 Extreme Forward Calorimeter (EFC) . . . . . . . . . . . . . . . . . . . . . 16 2.6 Central Drift Chamber (CDC) . . . . . . . . . . . . . . . . . . . . . . . . . 16 2.7 Aerogel ˘ Cerenkov Counter (ACC) . . . . . . . . . . . . . . . . . . . . . . . 21 2.8 Time of Flight (TOF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 2.9 Electromagnetic Calorimeter (ECL) . . . . . . . . . . . . . . . . . . . . . . 24 2.10 K L and Muon Detector (KLM) . . . . . . . . . . . . . . . . . . . . . . . . 25 3 Analysis Method 28 3.1 Data Sample . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 3.2 Particle Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 3.2.1 K/π Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 3.2.2 Electron Identification . . . . . . . . . . . . . . . . . . . . . . . . . 29 3.2.3 Muon Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 3.2.4 K L Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 3.3 Full Reconstructed Tagging Method . . . . . . . . . . . . . . . . . . . . . . 31 3.4 Event Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 3.4.1 The Definition of cos θ T . . . . . . . . . . . . . . . . . . . . . . . . 35 3.5 Estimation of background . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 3.6 Control Sample Study . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 3.7 Veto Studies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 3.7.1 Tracks and π 0 veto . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 3.7.2 K L veto . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 4 Extract Strategy and Result 55 4.1 PDF Construction for Fitting . . . . . . . . . . . . . . . . . . . . . . . . . 55 4.1.1 Correlation Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 4.1.2 Null Signal Test with toy MC . . . . . . . . . . . . . . . . . . . . . 61 4.1.3 Toy MC test with the distribution of events in signal box . . . . . . 62 4.2 Systematic uncertainties of Signal Yield . . . . . . . . . . . . . . . . . . . . 63 4.3 Upper Limit Estimation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 4.4 Fit Result . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 4.5 Branching fraction upper limit estimation . . . . . . . . . . . . . . . . . . 69 A Optimazation of E ECL threshold 71 | |
| dc.language.iso | en | |
| dc.title | 尋找B介子衰變至不可見末態粒子 | zh_TW |
| dc.title | Search for B to invisible final states at Belle | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 99-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 熊怡(Yee Bob Hsiung),侯維恕(George Wei-Shu Hou),王名儒(Min-Zu Wang),張敏娟(Ming-Chuan Chang) | |
| dc.subject.keyword | B介子,正子電子加速器,微中子,不可見末態, | zh_TW |
| dc.subject.keyword | B meson,KEKB,neutrino,invisible final state,beyond the Standard Model, | en |
| dc.relation.page | 76 | |
| dc.rights.note | 同意授權(全球公開) | |
| dc.date.accepted | 2011-08-08 | |
| dc.contributor.author-college | 理學院 | zh_TW |
| dc.contributor.author-dept | 物理研究所 | zh_TW |
| 顯示於系所單位： | 物理學系 | |
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