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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 張寶棣 | |
| dc.contributor.author | Ruei-Jhu Li | en |
| dc.contributor.author | 李蕊竹 | zh_TW |
| dc.date.accessioned | 2021-06-16T17:39:34Z | - |
| dc.date.available | 2012-08-17 | |
| dc.date.copyright | 2012-08-17 | |
| dc.date.issued | 2012 | |
| dc.date.submitted | 2012-08-14 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/64301 | - |
| dc.description.abstract | 本篇論文為尋找輕質量希格斯波色子(A0 )的存在證據。實
驗地點位於日本高能加速機構,使用了158百萬個Υ(2S)。根據 次最小超對稱模型(NMSSM)的預測,輕質量希格斯波色子可藉 由衰變通道: Υ(2S) → γA0 以及 Υ(2S) → Υ(1S)π + π − ; Υ(1S) → γA0 產生。我們的研究包括 A0 → μ+ μ− 和 A0 → τ + τ − 的結果。 由於並未找到輕質量希格斯波色子的存在證據,我們給予90%信 心水準的衰變機率乘積的上限: B(Υ(2S) → γA0 ) × B(A0 → μ+ μ− ) = (0.02 − 3.11) × 10−6 in the mass range 0.214 ≤ mA0 ≤ 9.00 B(Υ(2S) → γA0 ) × B(A0 → τ + τ − ) = (1.22 − 16.46) × 10−5 in the mass range 3.59 ≤ ma0 ≤ 9.19 B(Υ(1S) → γA0 ) × B(A0 → μ+ μ− ) = (0.005 − 3.54) × 10−6 in the mass range 0.212 ≤ mA0 ≤ 9.0 B(Υ(1S) → γA0 ) × B(A0 → τ + τ − ) = (5.06 − 64.68) × 10−5 in the mass range 3.59 ≤ mA0 ≤ 9.16 | zh_TW |
| dc.description.abstract | We report search for a light Higgs boson (A0 ) using 158 mil
lion Υ(2S) events collected with the Belle detector in the KEKB e+ − e− collider. The Higgs boson is identified in the decays Υ(2S) → γA0 and Υ(2S) → Υ(1S)π + π − , Υ(1S) → γA0 . Results from both A0 → μ+ μ− and A0 → τ + τ − decays are presented. We did not find evidence for the existence of A0 , the 90% C.L. upper limit on the product of braching fractions is given: B(Υ(2S) → γA0 ) × B(A0 → μ+ μ− ) = (0.02 − 3.11) × 10−6 in the mass range 0.214 ≤ mA0 ≤ 9.00 B(Υ(2S) → γA0 ) × B(A0 → τ + τ − ) = (1.22 − 16.46) × 10−5 in the mass range 3.59 ≤ ma0 ≤ 9.19 B(Υ(1S) → γA0 ) × B(A0 → μ+ μ− ) = (0.005 − 3.54) × 10−6 in the mass range 0.212 ≤ mA0 ≤ 9.0 B(Υ(1S) → γA0 ) × B(A0 → τ + τ − ) = (5.06 − 64.68) × 10−5 in the mass range 3.59 ≤ mA0 ≤ 9.16 | en |
| dc.description.provenance | Made available in DSpace on 2021-06-16T17:39:34Z (GMT). No. of bitstreams: 1 ntu-101-R98222023-1.pdf: 69022965 bytes, checksum: 3aadf3a1f42e7bb7cb7f8bd1fae0960d (MD5) Previous issue date: 2012 | en |
| dc.description.tableofcontents | 1 Introduction 1
1.1 Motivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 Analysis Strategy . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.3 Data Sample and Monte Carlo Simulation . . . . . . . . . . . 3 2 Event Selection 5 2.1 Skim Criteria . . . . . . . . 5 2.2 Track Selection . . . . . . . 7 2.3 Particle Identification . . . . 7 2.4 Additional Selection of Each Mode . . 8 2.5 Best Candidate . . . . . . . 9 2.6 Backgrounds . . . . . . . . . 9 3 Signal Extraction. . . .14 3.1 γμ+ μ− , γτ + τ − (τ τ → eμ) , π + π − γμ+ μ− with mμμ>3.1 GeV and π + π − γτ + τ − (τ τ → eμ) events . . . . . .14 3.1.1 γμ+ μ− event . . . . . . . . . . . . . .18 3.1.2 γτ + τ − (τ τ → eμ) event . . . . . . . .20 3.1.3 π + π − γμ+ μ− event . . . . . . . . . . .22 3.1.4 π + π − γτ + τ − (τ τ → eμ) event . . . . .24 3.2 π + π − γμ+ μ− event with mμμ < 3.1 GeV . . .25 4 Correction Factors and Uncertainties 27 5 Results 33 6 Conclusion 36 A Belle Experiment 39 A.1 KEKB Accelerator . . . . . . . . . . . . . . . . . . . . . . . . 39 A.2 Belle Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 A.3 Beam Pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 A.4 Silicon Vertex Detector (SVD) . . . .45 A.5 Central Drift Chamber (CDC) . . . .46 A.6 Aerogel ~Cerenkov Counter (ACC) . .47 A.7 Time of Flight Counter (TOF) . . . .47 A.8 Electromagnetc Calorimeter (ECL) .48 A.9 Extreme Forward Calorimeter (EFC)49 A.10 KL and Muon Detector (KLM) . . .49 B Details of Setting Event Selections 52 B.1 γμ+ μ− event . . . . . . . . . . . .52 B.2 γτ + τ − (τ τ → eμ) event . . . . . .53 B.3 π + π − γμ+ μ− event . . . . . . . . .55 B.4 π + π − γτ + τ − (τ τ → eμ) event . . .57 | |
| dc.language.iso | en | |
| dc.subject | 希格斯粒子 | zh_TW |
| dc.subject | (2S) | zh_TW |
| dc.subject | light Higgs boson | en |
| dc.subject | (2S) | en |
| dc.title | ϒ(2S)衰變至希格斯粒子之探尋 | zh_TW |
| dc.title | Search for a light Higgs boson in ϒ(2S) decay | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 100-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 王名儒,侯維恕,熊怡 | |
| dc.subject.keyword | 希格斯粒子,ϒ,(2S), | zh_TW |
| dc.subject.keyword | light Higgs boson,ϒ,(2S), | en |
| dc.relation.page | 57 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2012-08-15 | |
| 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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