ElectroWeak BaryoGenesis via Top Transport

TL;DR

This paper explores electroweak baryogenesis driven by top quark interactions in a two Higgs doublet model with flavor-changing neutral currents, highlighting potential experimental signatures and the role of additional scalars.

Contribution

It demonstrates that flavor-changing couplings in a two Higgs doublet model can naturally produce the conditions for baryogenesis and discusses observable phenomenological consequences.

Findings

First order electroweak phase transition achieved

Sufficient CP violation for baryogenesis demonstrated

Extra scalars are sub-TeV and detectable at the LHC

Abstract

We study electroweak baryogenesis driven by the top quark in two Higgs doublet model that allows flavor-changing neutral Higgs couplings. Taking Higgs sector couplings and the additional top Yukawa coupling $\rho_{tt}$ to be $\mathcal{O}$(1), one naturally has first order electroweak phase transition and sufficient $CP$ violation to fuel the cosmic baryon asymmetry. Even if $\rho_{tt}$ vanishes, the favor-changing coupling $\rho_{tc}$ can still achieve baryogenesis. Phenomenological consequences such as $t\to ch$, $\tau \to \mu\gamma$, electron electric dipole moment, $h\to\gamma\gamma$, and $hhh$ coupling are discussed. The extra scalars $H^0$, $A^0$ and $H^\pm$ are sub-TeV in mass, and can be searched for at the LHC.