New benchmark scenarios of electroweak baryogenesis in aligned two Higgs double models

TL;DR

This paper explores electroweak baryogenesis within aligned two Higgs doublet models, identifying benchmark scenarios consistent with current data and proposing tests via future collider, flavor, and gravitational wave experiments.

Contribution

It provides detailed evaluation of baryon asymmetry using the WKB method and identifies new benchmark scenarios compatible with existing experimental constraints.

Findings

Multiple benchmark scenarios explaining baryon asymmetry.

Parameter spaces consistent with collider, flavor, and EDM constraints.

Potential for testing scenarios with future experiments.

Abstract

We discuss electroweak baryogenesis in aligned two Higgs doublet models. It is known that in this model the severe constraint from the experimental results for the electron electric dipole moment can be avoided by destructive interference among CP-violating effects in the Higgs sector. In our previous work, we showed that the observed baryon number in the Universe can be explained without contradicting current available data in a specific scenario in the same model. We here first discuss details of the evaluation of baryon number based on the WKB method taking into account all order of the wall velocity. We then investigate parameter spaces which are allowed under the current available data from collider, flavor and electric dipole moment experiments simultaneously. We find several benchmark scenarios which can explain baryon asymmetry of the Universe. We also discuss how we can test these benchmark scenarios at future collider experiments, various flavor experiments and gravitational wave observations.