Restrictions on two Higgs doublet models and CP violation at the unification scale

Thesis/Dissertation · Thu Jan 01 04:00:00 EST 1987

OSTI ID:5014111

Athanasiu, G G

In Part I we examine bounds from CP violation in the neutral K system on charged Higgs masses and couplings in models with two Higgs doublets. While CP violation is still due only to a non-zero phase in the Kobayashi-Maskawa matrix, there are additional short-distance contributions involving charged Higgs exchange rather than W boson exchange. By having CP violation in the mass matrix, but not in the kaon to two pions decay amplitude, largely due to Higgs exchange, it is possible to obtain a small value of {epsilon}{prime}/{epsilon}. In Part II we obtain bounds on charged-Higgs-boson masses and couplings in two Higgs doublet models from their effects on neutral-B-meson mixing. The bounds are comparable to those obtained with additional assumptions from the neutral-K-system. Neutral-Higgs-boson effects on the spectrum and wave functions of tt bound states are examined in the same model. In the future they could lead to restrictions on, or discovery of, the corresponding neutral Higgs bosons if they have relatively low masses and enhanced couplings. Finally, in Part III, the three generation phase invariant measure of CP violation is shown to satisfy a simple and solvable renormalization group equation. Its value falls by four to eight orders of magnitude between the weak and grand unification scales in the standard model, as well as in its two Higgs and supersymmetric extensions. Such a small value of CP violation at the grand unification scale can pose a problem for baryogenesis; this avoided if there are heavy quarks with masses close to their fixed points.

• Research Organization: Stanford Univ., CA (USA)
• OSTI ID: 5014111
• Country of Publication: United States
• Language: English

Related Subjects

645200* -- High Energy Physics-- Particle Interactions & Properties-Theoretical
651000 -- Nuclear Physics
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CALCULATION METHODS
CP INVARIANCE
FIELD THEORIES
HIGGS MODEL
INVARIANCE PRINCIPLES
KOBAYASHI-MASKAWA MATRIX
MATHEMATICAL LOGIC
MATHEMATICAL MODELS
MATRICES
PARTICLE MODELS
RESTRAINTS
UNIFIED-FIELD THEORIES