BSMPT v2 a tool for the electroweak phase transition and the baryon asymmetry of the universe in extended Higgs Sectors

We present the C++ code BSMPT v2 which is an extension of the previous code BSMPT for the calculation of the strength of the electroweak phase transition in extended Higgs sectors. The new version BSMPT v2 includes the features of BSMPT and extends the already implemented models (the 2-Higgs-Doublet model (2HDM) in its CP-conserving and CP-violating versions and the Next-to-2HDM) by the Complex Singlet Extension of the Standard Model (CxSM). The major upgrade is the implementation of the computation of the baryon asymmetry of the Universe for the CP-violating 2HDM (C2HDM), which is performed in two different approximations. These changes and further smaller modifications are described in this manual. Additionally, a detailed explanation of the procedure for the implementation of new models is given, which has also changed with respect to the previous version.本研究提供C++代码BSMPT v2，其为前代版本BSMPT的扩展实现，用于计算扩展希格斯扇区（Higgs sectors）中的电弱相变（electroweak phase transition）强度。新版本BSMPT v2完整保留了BSMPT的全部功能，并在已实现的模型（包含CP守恒（CP-conserving）与CP破缺（CP-violating）两种形式的两希格斯二重态模型（2-Higgs-Doublet Model, 2HDM），以及次两希格斯二重态模型（Next-to-2HDM））基础上，新增了标准模型复单态扩充模型（Complex Singlet Extension of the Standard Model, CxSM）。本次版本的核心升级在于实现了针对CP破缺型两希格斯二重态模型（C2HDM）的宇宙重子不对称性（baryon asymmetry of the Universe）计算功能，该计算采用两种不同近似方案完成。本手册将对上述变更及其他细节优化内容进行说明。此外，本手册还详细阐述了新模型的实现流程，该流程相较前代版本已有所更新。