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    題名: Vacuum stability, neutrinos, and dark matter
    作者: Chen, Chian-Shu;Tang, Yong
    關鍵詞: Higgs Physics;Beyond Standard Model;Renormalization Group;Neutrino Physics
    日期: 2012-04-17
    上傳時間: 2016-11-12 02:10:56 (UTC+8)
    摘要: Motivated by the discovery hint of the Standard Model (SM) Higgs mass around 125 GeV at the LHC, we study the vacuum stability and perturbativity bounds on Higgs scalar of the SM extensions including neutrinos and dark matter (DM). Guided by the SM gauge symmetry and the minimal changes in the SM Higgs potential we consider two extensions of neutrino sector (Type-I and Type-III seesaw mechanisms) and DM sector (a real scalar singlet (darkon) and minimal dark matter (MDM)) respectively. The darkon contributes positively to the β function of the Higgs quartic coupling λ and can stabilize the SM vacuum up to high scale. Similar to the top quark in the SM we find the cause of instability is sensitive to the size of new Yukawa couplings between heavy neutrinos and Higgs boson, namely, the scale of seesaw mechanism. MDM and Type-III seesaw fermion triplet, two nontrivial representations of SU(2)L group, will bring the additional positive contributions to the gauge coupling g2 renormalization group (RG) evolution and would also help to stabilize the electroweak vacuum up to high scale.
    關聯: Journal of High Energy Physics 1204:019
    DOI: 10.1007/JHEP04(2012)019
    顯示於類別:[物理學系暨研究所] 期刊論文

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