Electroweak baryogenesis driven by extra top Yukawa couplings

Fuyuto, Kaori (Amherst Center for Fundamental Interactions, Department of Physics, University of Massachusetts, Amherst, MA, 01003, USA) ; Hou, Wei-Shu (Department of Physics, National Taiwan University, Taipei, 10617, Taiwan) ; Senaha, Eibun (Center for Theoretical Physics of the Universe, Institute for Basic Science (IBS), Daejeon, 34051, Republic of Korea)

01 December 2017

Abstract: We study electroweak baryogenesis driven by the top quark in a general two Higgs doublet model with flavor-changing Yukawa couplings, keeping the Higgs potential CP invariant. With Higgs sector couplings and the additional top Yukawa coupling ρtt all of O (1), one naturally has sizable CP violation that fuels the cosmic baryon asymmetry. Even if ρtt vanishes, the favor-changing coupling ρtc can still lead to successful baryogenesis. Phenomenological consequences such as t→ch , τ→μγ electron electric dipole moment, h→γγ , and hhh coupling are discussed.

Published in: Physics letters B (2017)
Published by: Elsevier
DOI: 10.1016/j.physletb.2017.11.073
License: CC-BY-3.0

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