Role of color-octet isodoublet scalar bosons in the physics ofK−K¯,Bd−B¯dmixing and theεparameter

Composite color-octet isodoublet scalar bosons appear in a natural extension of the minimal dynamical symmetry-breaking model. Two important parameters of this model, namely, the mass of the bosons and their Yukawa coupling with the top quark, can be constrained through the present data on $B_d-{\overline{B}}_d$ mixing and the $\epsilon$ parameters, but the contribution of the new physics to $K-\overline{K}$ mixing is shown to be small. We also find that a fairly large region of parameter space is available for this model to be feasible.