BSMPT v2 A Tool for the Electroweak Phase Transition and the Baryon Asymmetry of the Universe in Extended Higgs Sectors

TL;DR

BSMPT v2 is an enhanced C++ tool that calculates the electroweak phase transition strength and baryon asymmetry in extended Higgs models, including new models and computational approaches.

Contribution

The paper introduces BSMPT v2, which extends previous capabilities to include additional models and baryon asymmetry calculations with new approximation methods.

Findings

Implementation of baryon asymmetry computation in CxSM and C2HDM.

Addition of renormalisation scale variation in loop calculations.

Enhanced model support and user procedures.

Abstract

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 (at present for the C2HDM) in two different approximation, called the FH and the VIA approach. Furthermore, the possibility of varying the renormalisation scale in the loop-corrected effective potential has been added. 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.