Role of Higghs bosons in weak processes

Constraints on the constants of interaction between the Higgs particles and quarks are imposed in the framework of the standard gauge scheme involving six quarks and few Higgs-boson multiplets. Formulas are obtained for possible contribution given by the Higgs sector to the values of the mixing and CP-violation parameters of neutral systems similar to K0- anti K0. CP-violation effects in the D0- anti D0 system are estimated quantitatively at different relations between the vacuum expectation values of the Higgs-boson neutral components. With the account for 4-momentum of valent quarks differ from zero. Possible contribution coming from Higgs bosons exchange diagrams to the decays of strange and charmed hadrons is studied