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.

• Received 24 August 1993

DOI:https://doi.org/10.1103/PhysRevD.49.4793