Flavor constraints on two-Higgs-doublet models with general diagonal Yukawa couplings

2009/07/31 by F. Mahmoudi, Farvah Mahmoudi, Oscar Stål · 227 citations
Chemistry · Mathematics · Physics and Astronomy · #Black Holes and Theoretical Physics #Chemistry #Diagonal #Flavor #Geometry #Higgs boson #Mathematics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Yukawa potential #hep-ph

paper · pdf · doi:10.1103/physrevd.81.035016

published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 81(3) (American Physical Society) · 24 pages, 11 figures. v2: Minor changes to text and numerics, results and conclusions unchanged. References added

arxiv created 2009/11/12 · openalex publication_date 2010/02/17 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We consider constraints from flavor physics on two-Higgs-doublet models (2HDM) with general, flavor-diagonal, Yukawa couplings. Analyzing the charged Higgs contribution to different observables, we find that b\ensuremath→s\ensuremathγ transitions and \ensuremathΔM_B_d restrict the coupling \ensuremathλ_tt of the top quark (corresponding to cot\ensuremathβ in models with a Z₂ symmetry) to |\ensuremathλ_tt|<1 for m_H⁺\ensuremath\lesssim500 GeV. Stringent constraints from B meson decays are obtained also on the other third generation couplings \ensuremathλ_bb and \ensuremathλ_\ensuremathτ\ensuremathτ, but with stronger dependence on m_H⁺. For the second generation, we obtain constraints on combinations of \ensuremathλ_ss, \ensuremathλ_cc, and \ensuremathλ_\ensuremathμ\ensuremathμ from leptonic K and D_s decays. The limits on the general couplings are translated to the common 2HDM types I--IV with a Z₂ symmetry, and presented on the (m_H⁺,tan\ensuremathβ) plane. The flavor constraints are most excluding in the type II model which lacks a decoupling limit in tan\ensuremathβ. We obtain a lower limit m_H⁺\ensuremath\gtrsim300 GeV in models of type II and III, while no lower bound on m_H⁺ is found for types I and IV.

Citations

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• Revisiting B_s → μ ⁺μ ^- B s → μ + μ - in the two-Higgs doublet models with Z₂ Z 2 symmetry
• Higgs pair productions in the CP-violating two-Higgs-doublet model
• Δr in the Two-Higgs-Doublet Model at full one loop level—and beyond
• Light charged Higgs bosons to AW/HW via top decay
• Higgs properties in a softly broken Inert Doublet Model
• TWO COMPOSITE HIGGS DOUBLETS: IS IT THE LOW ENERGY LIMIT OF A NATURAL STRONG ELECTROWEAK SYMMETRY BREAKING SECTOR?
• The one-loop impact of a dependent mass: the role of m₃ in the C2HDM
• Determination oftanβfrom the Higgs boson decay at linear colliders