ElectroWeak BaryoGenesis via Top Transport

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.

Comments: 5 pages, 3 figures, to appear in proceedings of EPS-HEP2017 held July 2017 in Venice