讲座主题：Two-Higgs Doublet模型中的相变研究

专家姓名：边立功

工作单位：重庆大学

讲座时间：2018年4月10日 10:00

讲座地点：光电学院1511报告厅

主办单位：hy590海洋之神平台光电信息科学技术学院

内容摘要：

We study the electroweak phase transition in the alignment limit of the CP-conserving two-Higgs-doublet model (2HDM) of Type I and Type II. The effective potential is evaluated at one-loop, where the thermal potential includes Daisy corrections and is reliably approximated by means of a sum of Bessel functions. Both 1-stage and 2-stage electroweak phase transitions are shown to be possible, depending on the pattern of the vacuum development as the Universe cools down. For the 1-stage case focused on in this paper, we analyze the properties of phase transition and discover that the field value of the electroweak symmetry breaking vacuum at the critical temperature at which the first order phase transition occurs is largely correlated with the vacuum depth of the 1-loop potential at zero temperature.

We demonstrate that a strong first order electroweak phase transition (SFOEWPT) in the 2HDM is achievable and establish benchmark scenarios leading to different testable signatures at colliders. In addition, we verify that an enhanced triple Higgs coupling (including loop corrections) is a typical feature of the SFOPT driven by the additional doublet. As a result, SFOEWPT might be able to be probed at the LHC and future lepton colliders through Higgs pair production.

主讲人介绍：

2014年在南开大学获得博士学位，2014-2016年间起在中国科学院理论物理所(ITP)从事博士后研究工作。2016年被聘请为重庆大学物理科学学院讲师、硕士生导师,并于2017年获得韩国中央大学研究教授的职位。主要工作集中在宇宙学早期相变，暗物质唯象学研究。共发表文章17篇。