| 日時: |
2012-10-15 15:00 - 16:00 |
| 場所: |
研究本館1階会議室1 |
| 会議名: |
Electroweak Vacuum Stability with Neutrino and Dark Matter |
| 連絡先: |
山中 真人、masato.yamanaka-AT-kek.jp |
| 講演者: |
Dr. Yong Tang (NCTS, Taiwan) |
| 講演言語: |
英語 |
| URL: |
http://theory-center.kek.jp/theory/archives/s_c/seminar |
| アブストラクト: |
Motivated by the discovery 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 $eta$ function of the Higgs quartic coupling $lambda$ and can stabilize the SM vacuum up to high scale. Similar to the top quark in the SM, 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 $g_{2}$ renormalization group (RG) evolution and would also help to stabilize the electroweak vacuum up to high scale. Reference: arXiv:1202.5717 |
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