| Item type |
学位論文 / Thesis or Dissertation(1) |
| 公開日 |
2010-02-22 |
| タイトル |
|
|
タイトル |
Physics Beyond the Standard Model and Dark Matter |
| タイトル |
|
|
タイトル |
Physics Beyond the Standard Model and Dark Matter |
|
言語 |
en |
| 言語 |
|
|
言語 |
eng |
| 資源タイプ |
|
|
資源タイプ識別子 |
http://purl.org/coar/resource_type/c_46ec |
|
資源タイプ |
thesis |
| 著者名 |
浅野, 雅樹
|
| フリガナ |
アサノ, マサキ
|
| 著者 |
ASANO, Masaki
|
| 学位授与機関 |
|
|
|
学位授与機関名 |
総合研究大学院大学 |
| 学位名 |
|
|
学位名 |
博士（理学） |
| 学位記番号 |
|
|
内容記述タイプ |
Other |
|
内容記述 |
総研大甲第1142号 |
| 研究科 |
|
|
値 |
高エネルギー加速器科学研究科 |
| 専攻 |
|
|
値 |
14 素粒子原子核専攻 |
| 学位授与年月日 |
|
|
学位授与年月日 |
2008-03-19 |
| 学位授与年度 |
|
|
値 |
2007 |
| 要旨 |
|
|
内容記述タイプ |
Other |
|
内容記述 |
Although the standard model of the elementary particle physics has been successful for the last thirty years, several problems have been pointed out. Among them, the hierarchy problem and the existence of the dark matter especially lead us to consider new physics at the TeV scale. In this thesis, I investigate the supersymmetric model and the little Higgs model from these viewpoints. These models are possible simultaneous solutions to these two problems. <br /> In the little Higgs model, we focus on the littlest Higgs model with T-parity which is one of the simplest models implementing the little Higgs mechanism. T-parity is $Z_2$ symmetry which guarantees the stability of the lightest T-odd particle. The heavy photon is a dark matter candidate in this model. The dark matter mainly decays into weak gauge bosons in the galactic halo through s-channel annihilation, and therefore high energy positrons are produced by these bosons decays. We investigate a possibility of the dark matter detection using cosmic positrons in future experiments such as PAMERA and AMS-02. We calculate the expected positron flux at the Earth. We have found that the dark matter signal can be distinguished from backgrounds in the AMS-02, while the possibility of dark matter detection in PAMERA depends on model parameters. We also consider constraints from electroweak precision measurements. We recalculate contributions to Peskin and Takeuchi S, T, U parameters from heavy gauge boson loops. We also discuss the invisible decay width of the Higgs boson.<br /> In the supersymmetric model, we focus on the light Higgs boson scenario in which the mass of the lightest Higgs boson is less than 114.4 GeV. Although such a small mass is excluded by LEP2 experiments in the standard model, this region can be still allowed in the supersymmetric model. In this thesis, we determine model-parameters in the non-universal Higgs mass model, where universality relations on soft supersymmetry breaking mass terms are relaxed for the Higgs super multiplets in the mSUGRA model. We show that the scenario is consistent not only with results of many collider experiments but also with the observed relic abundance of dark matter. We also discuss the impact of dark matter search experiments for this scenario. |
| 所蔵 |
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|
値 |
有 |
要旨・審査要旨 (210.7 kB)
