Restrictions on Two Higgs Doublet Models and CP Violation at the Unification Scale.
Abstract
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 nonzero phase in the Kobayashi Maskawa matrix, there are additional shortdistance 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 samll value of epsilon^'/epsilon . In Part II we obtain bounds on chargedHiggsboson masses and couplings in two Higgs doublet models from their effects on neutralBmeson mixing. The bounds are comparable to those obtained with additional assumptions from the neutralKsystem. NeutralHiggsboson 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 is avoided if there are heavy quarks with masses close to their fixed points. I.
 Publication:

Ph.D. Thesis
 Pub Date:
 1987
 Bibcode:
 1987PhDT........59A
 Keywords:

 Physics: Elementary Particles and High Energy