双黑格斯二重态及其扩充模型的唯象研究

基于近年来的实验进展，本项目拟对双黑格斯二重态及其扩充模型开展研究。我们首先对双黑格斯二重态模型（2HDM）的理论限制进行系统研究，包括两圈阶重整化群方程分析，并研究其对相关唯象学的影响。我们还将严格求证lepton-specific 2HDM中额外黑格斯粒子与陶子Yukawa耦合的上限，应用较大的耦合缓解该模型解释缪子反常磁矩与陶子衰变轻子味普适性数据之间的矛盾。接下来，为了同时再解释电子反常磁矩，我们将对2HDM做一些扩充。另外，我们将结合LHC、味物理等相关实验数据详细研究具有额外规范U(1)群的2HDM，重点是解释B介子衰变轻子味普适性破坏数据超出；再进一步引入暗物质，结合相关实验限制和反常研究该类暗物质模型。最后，我们将密切跟踪LHC上的实验数据，进一步检验type-II 2HDM的参数空间。我们还将研究如何在LHC上探测2HDM中与一对标准模型粒子耦合非常小的黑格斯粒子。

Based on the recent development of experiments, we will study the phenomenology of two-Higgs-doublet model (2HDM) and its extensions. First, we will comprehensively study the theoretical constraints on 2HDM, including 2-loop renormalization group evolution, and discuss their effects on relevant phenomenology of 2HDM. Also we will examine upper bounds of the tau Yukawa couplings of extra Higgses, and apply their large couplings to relax the tension between muon anomalous magnetic moment and the lepton flavor universality of tau decay in the lepton-specific 2HDM. Next, we will extend 2HDM to simultaneously explain the data of electron and muon anomalous magnetic moment and the lepton flavor universality of tau decay. Besides, we will study the 2HDM with an extra gauged U(1) in detail using the experimental data of LHC, flavor physics, etc, especially for the lepton flavor universality violation in the semileptonic decays of B meson. Further, we will add dark matter to the model, and consider relevant experimental constraints and some anomalies to study the dark matter model. Finally, we will pay a special attention to the experimental data of LHC, and use the LHC data to exclude parameter space of type-II 2HDM. Also we will study how to probe the extra Higgs boson whose couplings to a pair of standard model particles are very small.