CP Violation for the Heavens and the Earth

Séminaire de George Hou — National Taiwan University —

Abstract: Electroweak baryogenesis can be driven by the top quark in a general two Higgs doublet model with extra Yukawa couplings. Higgs quartics provide the first order phase transition, while extra top Yukawa coupling ρtt can fuel the cosmic baryon asymmetry through the λt Im ρtt product, with flavor-changing ρtc coupling as backup. The impressive ACME 2018 bound on the electron electric dipole moment calls for an extra electron coupling ρee for exquisite cancellation among dangerous diagrams, broadening the baryogenesis solution space. The mechanism suggests that extra Yukawa couplings echo the hierarchical structure of standard Yukawa couplings. Phenomenological consequences in Higgs search and flavor physics are discussed, with μ and τ EDM touched upon.

About the author: George Hou received his Ph.D. at UCLA in 1985, with postdoc terms at Pittsburgh, MPI Munich, and a 5 year term at PSI in Switzerland, but returned to National Taiwan University in 1992. He initiated the NTUHEP group, and now conducts an Academic Summit Project incorporating CMS, Belle II, Lattice and Pheno.