| 日時: |
2009-05-19 11:00 - |
| 場所: |
研究本館2階220室 |
| 会議名: |
The strongly coupled fourth family and a first-order electroweak phase transition |
| 連絡先: |
櫻井、sakurai AT post.kek.jp |
| 講演者: |
Dr. Masaya Kohda (埼玉大学) |
| 講演言語: |
英語 |
| アブストラクト: |
We discuss a finite-temperature electroweak phase transition in models of dynamical electroweak symmetry breaking due to strongly coupled fourth-family fermions from the point of view of the electroweak baryogenesis. Based on the low-energy renormalizable effective theory, which consists of the fourth-family quarks and two SU(2)-doublet composite Higgs fields, we examine a possibility that the electroweak phase transition is strongly first order. Through the analysis of the finite-temperature effective potential at one loop with ring improvement, we found that the strongly first-order phase transition is possible even if the mass of the neutral scalar Higgs is larger than 114 GeV. It is also found that the requirements of the strongly first-order phase transition as well as the renormalizability lead to the fourth-family quark masses being smaller than about 300 GeV.
Reference： arXiv:0901.1962 [hep-ph] |
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