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研究生： 張庭嘉
Zhang, Ting-Jia
論文名稱： 從反物質磁譜儀二號的正子分數數據 給出惰性希格斯二重態模型的限制
Constraints on the Inert Higgs Doublet Model from AMS-02 Positron Fraction Data
指導教授： 張敬民
Cheung, Kingman
口試委員: 耿朝強
GENG, CHAOQIANG
徐百嫻
HSU, PAI-HSIEN
學位類別： 碩士
Master
系所名稱： 理學院 - 物理學系
Department of Physics
論文出版年： 2017
畢業學年度： 105
語文別： 英文
論文頁數： 19
中文關鍵詞： 暗物質 、反物質磁譜儀二號 、惰性希格斯二重態模型 、正子分數
外文關鍵詞： Inert Higgs Doublet Model, AMS-02, Dark Matter, Positron Fraction
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    • 反物質磁譜儀二號觀測到過量的正子分數。我們假設這個現象是來自於暗物質湮滅,而且嘗試用惰性希格斯二重態模型來解釋這個現象。我們用MicrOMEGAs 程式來計算正子與電子的流量,使用 χ 2 來判斷是否符合實驗。我們掃描了 Z 2 反對稱粒子的質量為 500 GeV 到 12000 GeV。我們沒有得到任何點可以滿足 95% 的信賴水準,我們最小的 χ 2 是 75.9。總得來說,當 Z 2 反對稱粒子的質量小於12000 GeV 時,來自惰性希格斯二重態模型的暗物質不適合
    用來解釋反物質磁譜儀二號觀測到的正子分數數據。

    We assume the excess e+/(e+ +e−) in AMS-02 data comes from annihilations of dark matter and try to interpret the data by Inert Higgs Doublet Model. We calculate the e ± flux with MicrOMEGAs code and use χ 2 to describe the goodness of fitting. We scan the parameter space : the masses of the Z 2 symmetry odd particles are
    between 500 GeV and 12000 GeV. However, we don’t have any points can reach 95% CL and the minimal χ 2 which we get is 7.59×10 1 . In summary, the inert Higgs Doublet Model parameter space is disfavored by AMS-02 e+/(e+ +e−) data when the masses of the Z 2 symmetry odd particles are smaller than 12000 GeV.

    Contents ...........................................................1 1 Introduction .....................................................2 2 Model ............................................................4 2.1 Inert Higgs Doublet Model . . . . . . . . . . . . . . . . . . . 4 2.2 Distribution of Dark Matter . . . . . . . . . . . . . . . . . . 6 2.3 Propagation of positrons . . . . . . . . . . . . . . . . . . . .7 2.4 AMS-02 Positron Data . . . . . . . . . . . . . . . . . . . . . .9 3 Data Analysis ....................................................11 4 Conclusion .......................................................16 Reference ..........................................................18

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