CP violation in the top-assisted electroweak baryogenesis

TL;DR

This paper investigates a top-assisted electroweak baryogenesis model extending the Standard Model with a scalar singlet, analyzing constraints from recent experimental data to assess its viability for explaining the universe's matter-antimatter asymmetry.

Contribution

It revisits the top-assisted electroweak baryogenesis model, deriving new constraints on CP violation and scalar mixing from latest experimental results.

Findings

Constraints on CP-violating coupling from ACME and oblique observables

Limits on Higgs-singlet mixing from LHC Higgs measurements

Bounds from four top-quark production data at LHC

Abstract

The origin of the baryon asymmetry of the universe (BAU) is a longstanding problem in the high energy physics. The electroweak baryogenesis mechanism, which generates the BAU during the first order electroweak phase transition, provides a testable solution to this problem. In this paper we revisit the top-assisted electroweak baryogenesis model, which extends the standard model (SM) with only one scalar singlet. Constraints on the new CP-violating coupling as well as the mixing between the SM Higgs and the new scalar singlet are derived by considering the latest result of ACME and oblique observables. Furthermore, we derive constraints on these two parameters arising from the data of Higgs measurement at the LHC as well as the four top-quark production at the LHC.