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研究生： 林詣淳
Lin, Yi-Chuen
論文名稱： 在 UMSSM 模型中尋找類標準模型的希格斯粒子
Search for SM-like Higgs in the UMSSM
指導教授： 張敬民
Cheung, Kingman
口試委員: 張敬民
阮自強
耿朝強
林貴林
張維甫
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： 2012
畢業學年度： 100
語文別： 英文
論文頁數： 35
中文關鍵詞： 希格斯粒子 、超對稱
外文關鍵詞： UMSSM, Higgs
相關次數： 點閱：2  下載：0 
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    • The discovery of Higgs is the last piece of standard model in
    particle physics.In December 2011,the Large Hadron
    Collider(LHC) have reported that they found some excess of
    signal in searching SM-like Higgs at 124GeV-126GeV.Motivated
    by the data,we use UMSSM model to search the SM-like Higgs.
    In this article,I briefly introduce the UMSSM model.Then I
    use this model to derive the mass of CP-even Higgs and then
    scan parameter space for the SM-like Higgs in the two ranges:
    (i)130 GeV < mh(SM−like) < 141 GeV
    (ii)120 GeV < mh(SM−like) < 130 GeV.
    We also investigate the branching ratio of Higgs to b
    \bar{b} , WW^* ,and chi chi.

    Contents 1 Introduction to MSSM 2 1.1 Chiral Supermultiplet:Wess-Zumino Model . . . . . . .. 3 1.2 Gauge Supermultiplet . . . . . . . . . . . . . . . . . 4 1.3 The MSSM . . . . . . . . . . . . . . . . . . . . . . . 6 2 The Mass of SM-like Higgs Boson in the UMSSM 10 2.1 The U(1)’-Extended Minimal Supersymmetric Standard Model (UMSSM) . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.2 Higgs Sector and EWSB . . . . . . . . . . . . . . . . 11 3 The Decay of SM-like Higgs in the UMSSM 17 3.1 Higgs Decay to q \bar{q} and l \bar{l} Pairs . . . . .17 3.2 Higgs Decay to Off-shell W^+ W^- . . . . . . . . . . .19 3.3 Higgs Decay to Off-shell ZZ pairs . . . . . . . . . . 22 3.4 Higgs Decay to Neutralinos . . . . . . . . . . . . . .25 4 Result 28 4.1 Constrains and Parameter Space . . . . . . . . . . . .28 4.2 The Scanning Result . . . . . . . . . . . . . . . . . 29 Bibliography　　　　　　　　　　　　　　　　　　　　　　　34

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    ,arXiv:1202.0054
    [11] K.Nakamura et al. (Particle Data Group),J.Phys.G 37,075021 (2010)
    [12] Talk given by A. Nisati (ATLAS Coll.) in Lepton-Photon 2011, Mumbai,India; Talk given by V. Sharma (CMS Coll.) in Lepton-Photon 2011,Mumbai, India; K. Sung [CMS Collaboration], arXiv:1109.2457 [hep-ex];ATLAS and CMS Collaborations, ATLAS-CONF-2011-157 and CMSPAS-HIG-11-23 (2011).
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