The flavor puzzle in multi-Higgs models

Abstract

We reconsider the flavor problem in the models with two Higgs doublets. By studying two generation toy models, we look for flavor basis independent constraints on Yukawa couplings that will give us the mass hierarchy while keeping all Yukawa couplings of the same order. We then generalize our findings to the full three generation Standard Model. We find that we need two constraints on the Yukawa couplings to generate the observed mass hierarchy, and a slight tuning of Yukawa couplings of order 10%, much less than the Standard Model. We briefly study how these constraints can be realized, and show how flavor changing currents are under control for $K-\bar{K}$ mixing in the near-decoupling limit.

26 pages, typos are corrected, references are added, the final version

References in corpus (5)

• Implications of D^0-\bar D^0 Mixing for New Physics
• Basis-independent methods for the two-Higgs-doublet model II. The significance of tan(beta)
• Lessons from Recent Measurements of D-\bar D Mixing
• Hidden Symmetry of the CKM and Neutrino Mapping Matrices
• Probing new physics with flavor physics (and probing flavor physics with new physics)

Cited by in corpus (2)

• Relating B_s Mixing and B_s -> mu+mu- with New Physics
• Custodial SO(4) symmetry and CP violation in N-Higgs-doublet potentials