Electroweak Baryogenesis in the CP-Violating Two-Higgs Doublet Model

TL;DR

This paper uses an upgraded computational tool to analyze the baryon asymmetry generated in the CP-violating two-Higgs-doublet model, comparing two approaches and considering various constraints to guide future research.

Contribution

It introduces the use of BSMPT v2 for calculating the BAU in the C2HDM, comparing two transport equation methods and analyzing parameter dependencies.

Findings

Differences between FH and VIA approaches in BAU calculations.

Parameter regions compatible with successful baryogenesis identified.

Guidance for future model improvements and computational methods.

Abstract

Recently we presented the upgrade of our code BSMPT for the calculation of the electroweak phase transition (EWPT) to BSMPT v2 which now includes the computation of the baryon asymmetry of the universe (BAU) in the CP-violating 2-Higgs-Doublet Model (C2HDM). In this paper we use {\tt BSMPT v2} to investigate the size of the BAU that is obtained in the C2HDM with the two implemented approaches FH and VIA to derive the transport equations, by taking into account all relevant theoretical and experimental constraints. We identify similarities and differences in the results computed with the two methods. In particular, we analyse the dependence of the obtained BAU on the parameters relevant for successful baryogenesis. Our investigations allow us to pinpoint future directions for improvements both in the computation of the BAU and in possible avenues taken for model building.