Item type 
学位論文 / Thesis or Dissertation(1) 
公開日 
20100222 
タイトル 


タイトル 
Physics Beyond the Standard Model and Dark Matter 
タイトル 


言語 
en 

タイトル 
Physics Beyond the Standard Model and Dark Matter 
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 
20080319 
学位授与年度 



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 Tparity which is one of the simplest models implementing the little Higgs mechanism. Tparity is $Z_2$ symmetry which guarantees the stability of the lightest Todd 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 schannel 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 AMS02. We calculate the expected positron flux at the Earth. We have found that the dark matter signal can be distinguished from backgrounds in the AMS02, 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 modelparameters in the nonuniversal 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 


値 
有 