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  2. 理學院
  3. 物理學系
請用此 Handle URI 來引用此文件: http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/32074
完整後設資料紀錄
DC 欄位值語言
dc.contributor.advisor何小剛(Xiao-Gang He)
dc.contributor.authorShu-Yu Hoen
dc.contributor.author何書宇zh_TW
dc.date.accessioned2021-06-13T03:30:32Z-
dc.date.available2011-08-08
dc.date.copyright2011-08-08
dc.date.issued2011
dc.date.submitted2011-07-29
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dc.identifier.urihttp://tdr.lib.ntu.edu.tw/jspui/handle/123456789/32074-
dc.description.abstract我們考慮了最簡單的暗物質模型之一,SM3+D,此模型結合了標準模型和
一個新的規範單態實純量場,我們將這個新的純量場取名為暗子D,它可以作為
所謂的“弱作用大質量粒子 ”的暗物質候選者,同時我們也討論了一個延伸模
型,SM4+D,包含了暗子和第四代標準模型。
從弱作用大質量粒子的暗物質直接探測實驗,包括CDMS-II 和CoGeNT 以
及B 介子衰變成K 介子加上遺失能量的過程,我們探究出在SM3+D 和SM4+D
這兩個模型中暗子的質量限制,我們發現大部分的暗子質量參數空間跟實驗數據
依然可以相容。再者,因為暗子和希格斯粒子的交互作用可能可以顯著的提升希
格斯粒子不可觀測的衰變模式,因此,暗子的存在或許會導致在第四代標準模型
的情況下,希格斯粒子的質量限制會有所減弱。此外,暗子可以影響重夸克變成
輕夸克加上希格斯玻色子的味改變衰變過程,而希格子粒子可以再有不可觀測地
次衰變模式,所以我們也研究了包含暗子的味改變中性轉換,符合的過程像是頂
夸克衰變t → cDD,而其中有一些轉變可能可以在Tevatron 和LHC 中被觀測到,
因而提供了對SM4+D 模型的額外檢驗。
zh_TW
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Previous issue date: 2011
en
dc.description.tableofcontents1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.1 Dark Matter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.1.1 History and Evidence . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.1.2 DM Candidates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
1.1.3 Theory : Relic density of WIMP . . . . . . . . . . . . . . . . . . . . . 11
1.1.4 Experiment : Direct WIMP searches . . . . . . . . . . . . . . . . . . 14
1.2 Standard model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
1.3 Fourth Generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
2. Scalar dark matter in standard model . . . . . . . . . . . . . . . . . . . . . . . . . 28
2.1 Brief description of SM3+D . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
2.2 Constraints from dark-matter direct searches in SM3+D . . . . . . . . . . . 33
2.3 Constraints from B → KDD decays in SM3+D . . . . . . . . . . . . . . . . 39
3. Scalar dark matter in standard model
with fourth generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
3.1 Brief description of SM4+D . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
3.2 Constraints from dark-matter direct searches in SM4+D . . . . . . . . . . . 46
3.3 Constraints from B → KDD decays in SM4+D . . . . . . . . . . . . . . . . 46
3.4 FCNC decays Q → qDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
4. Implications : The SM Higgs searches at colliders . . . . . . . . . . . . . . . . . . 52
4.1 The decay modes and the total width of the SM Higgs boson . . . . . . . . . 52
4.2 The SM Higgs boson decay with darkon sector . . . . . . . . . . . . . . . . . 55
Contents 4
5. Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Appendix 60
A. Statistical Thermodynamics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
A.1 Number of relativistic degrees of freedom g∗(T) . . . . . . . . . . . . . . . . 61
A.2 Entropy density . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
A.3 Boltzmann Equation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
B. Derivation of WIMP relic density . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
C. Derivation of Higgs boson decay modes . . . . . . . . . . . . . . . . . . . . . . . . 72
C.1 h → f ‾ f . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
C.2 h → W+W−, ZZ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
C.3 h → gg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
C.4 h → γγ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
C.5 h → γZ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
dc.language.isoen
dc.subject味改變中性流zh_TW
dc.subject暗子zh_TW
dc.subject第四代標準模型zh_TW
dc.subject希格斯玻色子zh_TW
dc.subjectB 介子衰變zh_TW
dc.subjectdarkonen
dc.subjectFCNCen
dc.subjectB meson decaysen
dc.subjectHiggs Bosonen
dc.subjectfourth generationen
dc.title純量場暗物質和第四代標準模型之研究zh_TW
dc.titleScalar Dark Matter and
Standard Model with Four Generations
en
dc.typeThesis
dc.date.schoolyear99-2
dc.description.degree碩士
dc.contributor.oralexamcommittee陳泉宏(Chuan-Hung Chen),阮自強(Tzu-Chiang Yuan),黃偉彥(Hwang, W-Y. Pauchy),張嘉泓(Chia-Hung Vincent Chang),耿朝強(Geng,Chao-Qiang)
dc.subject.keyword暗子,第四代標準模型,希格斯玻色子,B 介子衰變,味改變中性流,zh_TW
dc.subject.keyworddarkon,fourth generation,Higgs Boson,B meson decays,FCNC,en
dc.relation.page90
dc.rights.note有償授權
dc.date.accepted2011-07-29
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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